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Programming eeprom

I have been trying to program an atmel 25040 eeprom with a superpro3000, it accepts the program,but when I click on the verfy option an error message appears. Can any one please help?

Topic by jimenazo    |  last reply

Arduino eeprom&water flow?

Hello friendsanyone can help me how to save water flow meter in arduino mega eeprom

Question by ahmedhodhod  

how to save float value EEPROM

Hi This is Eabul. i want to save data to eeprom from press button . when TemperatureUp button press. increase float data like as 0.01> 0.02--------30.10> 30.61 and this value save to eeprom. and when TemperatureDown button press . decrease float data like as 30.60>30.59-----29.10 and update minus value eeprom and increase and decrease valud view lcd display . but when press button save int number not float. and show me lcd display int value. please help how to write and read float value from eeprom. press button. hear my code. //For Display #include // 3wire display LiquidCrystal595 lcd(4, 3, 2); // DS, ST_CP, SH_CP //For time #include #include RTC_DS1307 RTC; //for humidity #include "DHT.h" DHT dht; //for stor tempereratur and humidity #include int SetHumidity; int HumidityUp = 10; // switch up is at pin 10 int HumidityDown = 11; // switch down is at pin 11 float fix = 0.01; float settemp; // make a variable called temp float TemperatureUp = 12; // switch up is at pin 12 float TemperatureDown = 13; // switch down is at pin 13 //result view int led = 0; // led is at pin 0 void setup() { //For timer Wire.begin(); RTC.begin(); //For welcome screen lcd.begin(16,4); lcd.setCursor(0,0); lcd.print("Welcome Elab"); delay(2000); lcd.clear(); //for dht-11 pin setup dht.setup(A1); // data pin 2 } void loop() { //For tempererature up / down float temp[3]; getTemp(temp); float tempererature = temp[1]; settemp =; // read the settemp on the eeprom if(digitalRead(TemperatureUp) == 1 ) { settemp+=fix; settemp++; EEPROM.write (1, settemp); /* write the most recent settemp in eeprom data stoage*/ } else {} if(digitalRead (TemperatureDown) == 1) { settemp -= fix; settemp--; EEPROM.write (1, settemp); /* write the most recent settemp in eeprom data stoage*/ } if (tempererature >= settemp) { digitalWrite (led, 1); } else { digitalWrite (led, 0);} //else { }; lcd.setCursor(0,0); lcd.print("T:"); lcd.print(tempererature); lcd.setCursor(8,0); lcd.print ("ST"); lcd.print (settemp); lcd.print((char)223); //End tempererature controll //For humidity up / down SetHumidity =; int humidity = dht.getHumidity(); if(digitalRead(HumidityUp ) == 0 ) {SetHumidity++ ; } // add one to the settemp else {} if(digitalRead (HumidityDown) == 0) { SetHumidity--; } // Reduse settemp else { }; lcd.setCursor (0, 1); lcd.print ("CH:"); lcd.print (humidity); lcd.print ("%"); lcd.setCursor (8, 1); lcd.print ("SH:"); lcd.print (SetHumidity); lcd.print ("%"); delay (1); // wait 100 milliseconds EEPROM.write (2, SetHumidity); /* write the most recent settemp in eeprom data stoage*/ //End tempererature controll controll } //analog temperature void getTemp(float * t) { const int analogPin = 0; // replace 0 with analog pin const float invBeta = 1.00 / 3380.00; // replace "Beta" with beta of thermistor const float adcMax = 1023.00; const float invT0 = 1.00 / 298.15; // room temp in Kelvin int adcVal, i, numSamples = 5; float K, C, F; adcVal = 0; for (i = 0; i < numSamples; i++) { adcVal = adcVal + analogRead(analogPin); delay(100); } adcVal = adcVal/5; K = 1.00 / (invT0 + invBeta*(log ( adcMax / (float) adcVal - 1.00))); C = K - 273.15; // convert to Celsius F = ((9.0*C)/5.00) + 32.00; // convert to Fahrenheit t[0] = K; t[1] = C; t[2] = F; return; }

Topic by esumon    |  last reply

How to use AT28C64B? Answered

I am making an 8-Bit Computer for a science fair project. I have everything working, but there is one problem. Everything action has to be done manually. It could work this way but I want to be able to write a program, press a button, and the computer will do the rest. To do this I have to use a control matrix to control the Input/output of each device to the bus. To do this I will use an EEPROM. However, I am using TTL logic and the AT28C64B is CMOS, but it has TTL and CMOS logic compatible Inputs and Outputs. When I programed it, I did WE low OE high and CE low. When I read from it I had WE high, OE low and CE low. When I had CE plugged into nothing which I think is High-Z, I noticed just a brightness difference between 0 and 1 on the LEDs. When I plugged the Chip Enable(CE) into ground it made every LED the same brightness so that you could not tell the difference. For my TTL logic I need either voltage or ground to control 1 or 0. Am I doing something wrong? Please help me! I really need the help.

Question by BeauH3    |  last reply

Help programming a 8 pin eeprom

Hi, can any one help on programming a atmel 25040 eeprom? I have a superpro3000. This chip accepts the program, but when i verify it a error message appears.

Topic by jimenazo    |  last reply

Playing Music on Arduino from EEPROM?

Hi,I want to make a device that has a few audio tracks avalible to be played from the press of a button. I want to have the audio tracks stored on something like an EEPROM because pcpartpicker I am not going nba reddit to be changing them very often. What is the best way to use an external EEPROM that is large enough to store an audio track (about 700kb)? Would I be better off trying to use some other type of storage device? reverse phone lookupThanks!

Topic by MonilGomes    |  last reply

MPLAB and PIC16F628A, basic EEPROM functions wont work

Hello all Ive got a query about the simulator in MPLAB.  I'm using a PIC16F628A-IP and Ive written a couple of subs to run the EEPROM functions, but when I try and run the program in the simulator and observe the registers, I'm noticing that EECON1 is not accepting bit changes, and when reading from the EEPROM, i get as far as getting the correct value into W register (MOVFW EEDATA), then the next step, simply a RETURN command, for no reason wipes the W register back to 0 and hence the routine always returns a 0 Can somebody have a look and see whats going wrong, this is one of the easiest routines to write as there are so many examples on the web, Ive even used code straight from Microchip's Code Library and that didnt work either, its driving me MAD!!! All I am trying to do with the following code is simply read the EEPROM contents of address 05, display the returned contents to PORTB, wait a second, then increment the contents by 1 and resave into the EEPROM at address 05, so by rights on power up I should see FF then 00 then 01 then 02, etc, incrementing every second, on PORTB....I'm a bit of a stickler for custom keywords so sorry if its a bit confusing, makes perfect sense to me of course! ;  GENERIC PROGRAMMING HEADER  LIST P=16F628A   ; DETERMINE CORE TYPE  INCLUDE "P16F628A.INC" ; INCLUDE DEFAULT ASSEMBLY FILE FOR THIS CORE  ORG 00H     ; START PROGRAM AT LINE 0  RADIX HEX    ; ASSUME HEX UNLESS SPECIFIED  ERRORLEVEL -302  ; NO BANK WARNINGS DURING ASSEMBLY   ;  SET BURN CONIFGURATION FOR NO WDT AND INTERNAL OSC AT 4MHZ  __CONFIG _CP_OFF & _WDT_OFF & _PWRTE_ON & _BODEN_OFF &_INTRC_OSC_NOCLKOUT & _MCLRE_OFF & _LVP_OFF ;  CONSTANTS AND VARIABLES OPT  EQU 81H  ; OPTION REGISTER NN  EQU 02AH ; GENERAL N REGISTER FOR COUNTING DELAYS XX  EQU 02BH ; GENERAL X REGISTER FOR COUNTING DELAYS YY  EQU 02CH ; GENERAL Y REGISTER FOR COUNTING DELAYS TEMP EQU 02DH ; GENERAL TEMPORARY FOLDER 1 TMP  EQU 02EH ; GENERAL TEMPORARY FOLDER 2 FLAGS EQU 020H ; MISCELLANEOUS PROGRAM SPECIFIC FLAGS N  EQU 021H X  EQU 022H ; GENERAL TEMP STORES Y  EQU 023H ;  CUSTOM INSTRUCTIONS #DEFINE   BANK0     BCF       STATUS,RP0          ; Sel Bank 0 #DEFINE   BANK1     BSF       STATUS,RP0          ; Sel Bank 1 #DEFINE   READNVM CALL READ #DEFINE   WRITENVM CALL WRITE #DEFINE   W10MS  CALL DELAY #DEFINE   W1S  CALL DELAY1S ;----------------------------------------------------------------- ;  INITIALISE MICRO ;----------------------------------------------------------------- INIT   BANK1   CLRF  TRISB ; PORT B DEFINED ALL OUTPUTS   MOVLW 0FFH   MOVWF TRISA ; PORT A ALL INPUTS   BANK0 ;  SET TO MIMIC 16F84 BY TURNING OFF COMPARATOR   MOVLW 07H   MOVWF CMCON ;  PURGE GENERAL RAM FILES   CLRF NN   CLRF XX   CLRF YY   CLRF TEMP    CLRF TMP    CLRF FLAGS   CLRF N   CLRF X   CLRF Y   CLRF PORTA   CLRF PORTB   CLRF OPT   CLRF INTCON   ;------------------------------------------------------------------- ;  MAIN PROGRAM ;------------------------------------------------------------------- MAIN; ORIGIN   MOVLW 05   READNVM   MOVWF PORTB   W1S   MOVLW 05   MOVWF EEADR   MOVF PORTB,W   INCF W,1   MOVWF EEDATA   WRITENVM   GOTO  MAIN ;--------------------------------------------------------------------------- ;  END OF MAIN PROGRAM BODY ;---------------------------------------------------------------------------   GOTO FINISH  ; PROGRAM LOOP FALLOUT ;--------------------------------------------------------------------------- ;  SUBROUTINES ;--------------------------------------------------------------------------- ; LIST OF AVAILABLE SUBS: ; DELAY  = 10mS DELAY ; DELAY1S  = 1 sec DELAY ; WRITE  = WRITE TO EEPROM, MUST BE LOADED WITH EEDATA AND EEADR B4 ENTRY ; READ  = READ FROM EEPROM ADDRESS HELD IN W BEFORE ENTRY, RETURN RESULT IN W ;  10mS DELAY DELAY       MOVLW 0AH   MOVWF XX OUTER   MOVLW 0C7H   MOVWF YY INNER   NOP         NOP         DECFSZ  YY,1         GOTO    INNER                 DECFSZ  XX,1         GOTO    OUTER   NOP   NOP   NOP   NOP   NOP   NOP   NOP         RETURN DELAY1S   ; 100x10mS DELAYS   MOVLW  064H   MOVWF NN D1L  W10MS   DECFSZ NN,1   GOTO D1L    RETURN   WRITE       BANK1         CLRF EECON1                        BSF EECON1,WREN            ; enable write   W10MS   W10MS   BCF INTCON,GIE         MOVLW H'55'                ; magic sequence         MOVWF EECON2                       MOVLW H'AA'                          MOVWF EECON2                       BSF EECON1,WR   W10MS   W10MS             eeloop BTFSC EECON1,WR            ; wait for WR to go low         GOTO eeloop                ; not yet         BCF EECON1,WREN                    BCF INTCON,GIE           ; clear the interrupt flag         BANK0   W10MS   W10MS         RETURN READ BCF EECON1,WREN   MOVWF EEADR                ; set up eeprom address from W         BANK1   BSF EECON1,RD              ; set the read bit         BANK0   MOVFW EEDATA              ; return value in W         RETURN   ;  PROGRAM ENDS FINISH   END Note, this will probably make more sense if its copied and pasted into an ASM in MPLAB, as the tab stops and comments become more apparent THanks for looking  

Topic by whitebakecase    |  last reply

Help on interfacing CAT35C104 Serial EEPROM to my arduino UNO please.? Answered

Hey, I'm still semi new to Arduino, but I can read/write to analog/digital pins and communicate via I2C and SPI with other devices and micro controllers, but those are more widely known and I have here with me a ton of 8 PIN DIP, CAT35C104 Serial EEPROM IC's.. And with all that EEPROM lying around I wanted to put it to some use. But I am still not an expert and don't know how to begin to interface it to my Arduino UNO R3.. :L Specifically it shows: CAT35C104 Serial EEPROM 4kb data storage, 512 x 8 bit registers, 256 x 16 bit Can anyone help me get this to work? I also have trouble with "opcodes" kinda confused.. right now I know the times it takes to read/write, and the clock frequency (1MHz) And the pin diagram.. Any help would be appreciated!!!!!

Question by Mudbud    |  last reply

Need help trying to get the Arduino working with the RGB Matrix (with backpack) and an EEPROM chip.

Hi everyone, first question on instructables! I have an Arduino Deumilanove, a Sparkfun RGB Matrix with backpack, and an EEPROM chip (24LC256). I have the Arduino all hooked up to the matrix and have been able to mess around with some basic images and colors, but I have a lot of questions. So far, to display letters I have been setting up sections of code that light up each LED separately. I know there has to be a more efficient way to do this and was wondering how? Also, I have an EEPROM chip that is setup with the Arduino and Matrix but can't figure out how to use it. I have looked at the code for it on the Arduino website and I can't really figure out how it all works. So basically, here's what I want to be able to do: - Store the alphabet in the EEPROM - Be able to recall letters from the EEPROM - Display marquee messages Thanks in advance!

Question by xlivewire7x    |  last reply

is it possible to store an arduino library on eeprom if it is big enough?

I was wondering if you could store an arduino library on an eeprom chip because the sound library for the waveshield kit is very large (~10KB according to she had also stated under the waveshield tutorial that it is too much to store on the ATMEGA328's eeprom. she didn't say anything about other eeprom chips. i was wondering if it is possible to do this because she had stated that there is not enough eeprom on the arduino chip.

Question by kroq-gar78    |  last reply

How can I make a homebrew EEPROM programmer?

Hi everyone!  I have some EEPROMS I would like to burn (27C512, 27C256, 24C256).  I have a Parallax Propeller, a Z80, a 6502, and an Arduino Uno to help me make an EEPROM burner.  I know that EEPROM burners run $40+ commercially (even on EBAY!), so I would like to try building my own at home.  I have an abundant supply of 74XXXX chips at home, as well as a good supply of capacitors and resistors.   I don't have a Parallel Port on my computer, but I have a USB port as well as an RS232 to USB converter.  I'm running Windows XP and Ubuntu - Lucid Lynx 10.04, so if I need a specific OS to burn these EEPROMS, I have Windows and Linux. I need an EEPROM burner that could  erase/burn the 27CXXX EEPROMS/EPROMS/PROMS.  I know through using the Propeller that I can write to the 24C256 through the Propeller, but could someone please help me in building a homebrew EEPROM burner?

Question by prrgg14935    |  last reply

How to read uart data and write to i2c device.

// Port for the I2C #define I2C_DDR DDRD #define I2C_PIN PIND #define I2C_PORT PORTD // Pins to be used in the bit banging #define I2C_CLK 0 #define I2C_DAT 1 #define I2C_DATA_HI()\ I2C_DDR &= ~ (1 << I2C_DAT);\ I2C_PORT |= (1 << I2C_DAT); #define I2C_DATA_LO()\ I2C_DDR |= (1 << I2C_DAT);\ I2C_PORT &= ~ (1 << I2C_DAT); #define I2C_CLOCK_HI()\ I2C_DDR &= ~ (1 << I2C_CLK);\ I2C_PORT |= (1 << I2C_CLK); #define I2C_CLOCK_LO()\ I2C_DDR |= (1 << I2C_CLK);\ I2C_PORT &= ~ (1 << I2C_CLK); void I2C_WriteBit(unsigned char c) {     if (c > 0)     {         I2C_DATA_HI();     }     else     {         I2C_DATA_LO();     }     I2C_CLOCK_HI();     delay(1);     I2C_CLOCK_LO();     delay(1);     if (c > 0)     {         I2C_DATA_LO();     }     delay(1); } unsigned char I2C_ReadBit() {     I2C_DATA_HI();     I2C_CLOCK_HI();     delay(1);     unsigned char c = I2C_PIN;     I2C_CLOCK_LO();     delay(1);     return (c >> I2C_DAT) & 1; } // Inits bitbanging port, must be called before using the functions below // void I2C_Init() {     I2C_PORT &= ~ ((1 << I2C_DAT) | (1 << I2C_CLK));     I2C_CLOCK_HI();     I2C_DATA_HI();     delay(1); } // Send a START Condition // void I2C_Start() {     // set both to high at the same time     I2C_DDR &= ~ ((1 << I2C_DAT) | (1 << I2C_CLK));     delay(1);     I2C_DATA_LO();     delay(1);     I2C_CLOCK_LO();     delay(1); } // Send a STOP Condition // void I2C_Stop() {     I2C_CLOCK_HI();     delay(1);     I2C_DATA_HI();     delay(1); } // write a byte to the I2C slave device // unsigned char I2C_Write(unsigned char c) {     for (char i = 0; i < 8; i++)     {         I2C_WriteBit(c & 128);         c <<= 1;     }     //return I2C_ReadBit();     return 0; } // read a byte from the I2C slave device // unsigned char I2C_Read(unsigned char ack) {     unsigned char res = 0;     for (char i = 0; i < 8; i++)     {         res <<= 1;         res |= I2C_ReadBit();     }     if (ack > 0)     {         I2C_WriteBit(0);     }     else     {         I2C_WriteBit(1);     }     delay(1);     return res; }

Topic by Blixxer    |  last reply

My Xbox hard drive died! I need help digging me out of this pit! Answered

I have the eeprom, I have copies of the E and C drives, I just need help starting over!  Please, if this doesn't get fixed my brother is going to hate me for ruining our xbox!  (Original xbox)

Question by furrysalamander    |  last reply

How to save mobile no in arduinos eeprom after reading it from sms recieved on arduino via sim 800 module

Hello! i am building a college project irrigation monitoring device which monitor soil moisture and send that data to mobile via sms. the number to which the sms is send is initially feed into arduino sketch. i want to change that no by sending a sms to arduino . that sms must contain a password followed by new mobile no i have tried but it could not read that no from sms and put it into eeprom. on aduino forum also their is no clue about how to do.sorry for such english.please help .

Question by pratikpitale  

Will a magnet mess up or destroy the memory of a micro controller or EEPROM chip? Answered

I'm using an ATMega 328 chip (Arduino duemilanove), if that matters at all. Ask me if you need the chip name for the EEPROM. Also, if you happen to know, would a magnet mess up flash memory?

Question by kroq-gar78    |  last reply

picaxe code help? Answered

Here is the code for a breathnalayzer using picaxe14m2  ignore the if b2= as i have to experiment and get the values and i havent done so. the code stores messages in eeprom and in the starting it operates a rgb led to create effects the code: low B.0'initialise lcd outpu pause 500'wait for lcd to initialise 'load messages in eeprom EEPROM 0,("NO ALCOHOL") EEPROM 10,("ONE OR TWO DRINKS") EEPROM 27,("BUZZED") EEPROM 33,("DRUNK") EEPROM 38,("WASTED") EEPROM 44,("BLOW ON THE SENSOR FOR 5 SEC") high b.2'red pause 2000 low b.2 high b.3'green pause 2000 low b.3 high b.4'blue pause 2000 low b.4 pause 1000 high b.3,b.4'sky blue pause 2000 low b.3,b.4 pause 1000 high b.2,b.4'pink pause 2000 low b.2,b.4 pause 1000 high b.3,b.2'yellow pause 2000 low b.3,b.2 pause 1000 high b.2,b.3,b.4'white pause 2000 low b.2,b.3,b.4 pause 1000 for b0=45 to 75 'print blow on the sensor read b0,b1 serout B.0,n2400,(254,1,b1) next b0     main:readadc B.1,b0      if b2=54 then main1      if b2=45 then main2      if b2=45 then main3      if b2=45 then main4      if b2=245 then main5      goto main      main1:high b.3'on green led       for b3= 0 to 9'print no alcohol       read b3,b4'read eeprom locations 0to10       serout b.0,n2400,(254,1,b4)       next b3       low b.3       goto main       main2:high b.4'on blue led       for b5= 11 to 27       read b5,b6       serout b.0,n2400,(254,1,b6)       next b5       low b.4       goto main       main3:high b.3'sky blue       high b.4       for b7= 28 to 33       read b7,b8       serout b.0,n2400,(254,1,b8)       next b7       low b.3       low b.4       goto main       main4:high b.3'yellow       high b.2       for b9= 34 to 38       read b9,b10       serout b.0,n2400,(254,1,b0)       next b9       low b.3       low b.2       goto main       main5:high b.2'red danger       for b11= 39 to 44       read b11,b12       serout b.0,n2400,(254,1,b12)       next b11       low b.2       goto main

Question by robot1398    |  last reply

How to add a memory function when I push a button

I have a proyect with a MLX90614 (an ir infrared thermometer with I2c), and the output temperature is displayed in a oled 128x64 I2c, I am using an arduino pro mini, the code works well, but i want to add a function: I want to press a button that saves the temperature shown, in the right down corner of the screen, and if I press it again to save again the temperature. It is like a memory function, I searched on the internet and I discovered that there is a memory in the arduino called eeprom but i have problems combining that function with the code. Any help appreciated. Thanks. Code: #include "U8glib.h"            // U8glib library for the OLED #include               // Wire library for I2C communication #include // MLX90614 library from Adafruit Adafruit_MLX90614 mlx = Adafruit_MLX90614(); U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE); // I2C void draw(void) {   u8g.setFont(u8g_font_profont15r);        // select font   u8g.drawStr(1, 12, "Object Temperature");//   u8g.setFont(u8g_font_profont29r);        // select font for temperature readings   u8g.println("°C");                        // prints C for Celsius   u8g.setPrintPos(35, 55);                 // set position   u8g.println(mlx.readObjectTempC(), 0);   // display temperature from MLX90614 Serial.println(mlx.readObjectTempC(), 0); // u8g.drawRFrame(15, 20, 100, 30, 10);     // draws frame with rounded edges } void setup(void) {   Serial.begin(9600);     mlx.begin();  //Receive data from the sensor } void loop(void) {   u8g.firstPage();    do     {      draw();          }   while( u8g.nextPage() );     delay(1000);  // Delay of 1sec }

Question by tmercados    |  last reply

AT28C64B Answered

I am really having a big problem with that EEPROM AT28C64B how i can load the data from this IC ? .. i am not sure if i programmed it right ? .. i tried to connect the output to LEDS but none of them worked .. can someone explain how to write into the data ?! .. and the important thing how to read the data i wrote ?! .. how to use them ? .. thanks in advance

Question by mac00    |  last reply

starting circuit for programmable sequence, for flashing LED?

Hi- I am interested in suggestions for starting points to build a programable flashing LED.  The intervals of dark/light should be configurable, kind of like morse code.  But not subject to what I recall as requirements for Morse- dashes are 2x as long as dots, or something- duration will vary for both.  Maximum total length of sequence is 10 seconds. There are a lot of flashing LED circuit Instructables, some very old and referencing 7 yr old chips- unsure if I can get those chips. In an ideal world, when I am done, I could have multiple EEPROMs that I could switch out to configure the flash sequence I wish.  One sequence per EEPROM.  Or another means to accomplish this. My background:  I can solder a little, I can program and shell script a little, I have not much idea about electronics at all. Thank you for pointers to a jumping-off spot for me!

Question by bmcewen    |  last reply

Which Processor?

Hello everyone. I'm new here and I have a quick question about processors. I'm working on a project that requires a device to take inputs piezo buzzer elements and trigger an LED. The catch is I need a programmable chip so I can have pre-set outputs on the LEDs. I'd need something that can be rewritten (like an EEPROM) I've been thinking abuot using a PIC or a BASIC Stamp but I'd though I'd do a bit of research first.

Topic by mrpaps    |  last reply

Can I import a Blogspot Blog to create an instructable?

Can I import a BlogSpot Blog to create an instructable?I am currently writing a blog on googles BlogSpot about how I added more memory to one of my Arduino projects and compressed G-Code to save the plots on the EEPROM.I was thinking it may be a good instructable for those that write there own programs, and to entre it into the current Arduino contest.I haven't finished it yet: My BlogIt's quite long so an import would be better than copying and pasting

Question by Palingenesis    |  last reply

Arduino EPROM Programming?

Ok, so I have decided to make an EPROM programmer so I can upload NES games to cartridges ( home-brew, not pirated. ) Does anyone know how to do this? I am a novice at coding, and, when it comes down to wiring, I can't really discern which resistor goes here and there and what value it should be, things like that. When I google "arduino eprom writer" All I get is EEPROM writers. I just want to know if someone on instructables has done it, and how.

Question by Krayzi99    |  last reply

Please use better SUBJECT lines

It would be REALLY NICE if when people posted a question in the forums, they put some useful information in the subject line so that people who might answer the question would have a quick clue as to whether they can help. Here are some particularly bad recent examples:Please tell me if this will workI need some help on a project.I need some helpQuestion?And to be fair, here are some subject lines that were OK to excellent (I was only interested in half, but at least I could tell from the other subject lines that I wasn't interested!):Help programming a 8 pin eepromAirsoftJoule Thief Troublesyour favorite song?

Topic by westfw    |  last reply

Emergency Dash Light - Repair

Hello All - I am attempting to repair an Emergency Dash Light for a friend of mine.  It has blue LED lights it is similar to the one pictured in this link:;=USD&products;_id=11981  Initially the unit had all 4 LEDs burned out I fond a source for them and replaced same all worked fine.  After reassembling the unit I discovered in final test that the controlling chip went bad.  I think the chip is a EEPROM at least the package is a DIP-8.  The device has a function select push button and there are 4 flashing formats; wig-wag, flash twice wig-wag, all steady on; all on flash.  Any suggestions? 

Topic by Foxtrot70    |  last reply

Gadget Gangster Propeller Platform

The Propeller Platform Module (pictured below) includes an 80Mhz, 160 MIPS Parallax Propeller microcontroller, 32kb of EEPROM with space for a second EEPROM, 5V and 3.3V Voltage Regulators and the pin sockets to add additional Gadget Gangster Platform modules like the LCD UI Module or the Prototyper Module.All Gadget Gangster Platform Modules utilize .1" pin spacing and are breadboard compatible. Here's a little video demonstration of the LCD UI and Propeller Modules: What is the Gadget Gangster Platform?The Gadget Gangster Platform is a lot like the Arduino with a few improvements on the basic idea;-Modules (a.k.a. shields) can be connected to each other on top and bottom. For example, you might have a Propeller module in the middle, an LCD UI on the top, and a prototyper on the bottom. We've got a few initial modules to start, and we'll continue to expand on the selection with more modules and microcontrollers.-Pin spacing is .1". This makes the Platform compatible with breadboards, and it lets you use Platform modules in combination with other project boards.-The board footprint is 3.8" x 2.5", which is the same footprint as ExpressPCB's MiniBoard service. This makes it easier to add your own custom module.-Because they're featured in Jon Williams' Spin Zone column in Nuts and Volts, they're well documented. The Propeller Platform Module will be the basis for many of projects described in his upcoming columns and the LCD UI module will featured in his September '09 column. -Platform Modules are licensed under the MIT license (essentially public domain), giving you the flexibility to use the design in commercial products or anything else without restriction.[/list]I'm super-excited about these new project boards. There's more info on Gadget Gangster but if you have any questions, you can just reply to this thread.

Topic by Gadget Gangster    |  last reply

What to do with old robot? / Cybot

I found an old robot that was part of one of those 'build it yourself' magazine series. I was gonna eBay it but found there was actually quite alot of cool stuff in there so I've compiled a list and I'm gonna make an instructable using some of the parts, But I need ideas / help.Here are (the best) parts.2x sets of ultrasonic emitters / receivers2x LDRs large2x smaller photoresistors (used for line following)2x set of inrfa red emitter& reciever leds2x bright white leds + various others2x 9v motors & gear housingsLCD display 5cm squreeepromspeed controllers selector switches etcand a load of pre programmed processors that can't be reused.some more technical details here

Topic by madmanmoe64    |  last reply

How to build a simple CPU from 74XX Logic Chips? Answered

Hi everyone! I'm wondering what are some good resources to learn how to build a simple programmable CPU from 74XX logic chips.  I'd like to build one where I use DIP switches to program the CPU.  I don't have an EEPROM/EPROM/PROM burner, so using those are out of the question.  I've seen some CPU's already that run an internet server, but they are too complicated/expensive to build and understand.  I want to learn how a CPU can be built and the principles behind it.   I have about 150 74XX chips, including a 74LS181 ALU unit.  I also have enough capacitors and resistors for the project. Thank you! 

Question by prrgg14935    |  last reply

Attempting to create tiny, wearable, covert, simple button click counter for behavioral mod

Hi all, I've been searching both this forum and the internet in general and strangely have not come across what I'm looking to do even though to me it seems very simple. Here are the specifications/requirements of the device that I am trying to create: -extremely tiny form factor (ideally a ring sized device but I'll settle for a thin bracelet) -unobtrusive/inconspicuous (I guess a thin bracelet that could hide under a sleeve might be best) -battery powered/untethered (This is essential. The device would be useless if depended on a connection to a computer or wall socket) -battery life must last a full day -data logged is just a simple time/day stamp that would indicate when a button was clicked by the wearer      (wearer would manually click the button during the day when certain thoughts came up for him/her)       This requirement indicates that the micro controller chosen would need a clock built in and        some kind of storage - be able to upload the data to a computer I did my preliminary research considering these requirements and I came up with the following electronic components that might work: - teensy 3 (has real time clock and 2K EEPROM which should be plenty of memory for storing date stamps) - ulog (1MB of usable space across 3 analog channels, couldn't find anything about a built in clock) - Pro Micro - 3.3V/8MHz (not sure about built in real clock  but storage is 32K flash space) - OpenLog (wasn't clear about how much built in storage and didn't see any build in real time clock) These are the best I could find. If anyone has better suggestions please let me know? My idea is to connect a Mini Push Button Switch to one of the digital inputs on one these micro controllers/data loggers and write a simple sketch that records the time the button was pushed in a MMDDYYhhmm format (10 bytes per click). To power any of these micro controllers/data loggers I was planning to use a Coin Cell Battery - 12mm. I was going to sew the micro controllers/data loggers on one side of a thin piece of material that would serve as a bracelet and sew the battery on the other side. Although I'm not sure how to fix the battery to the cloth and how to connect it to the micro controllers/data loggers. I'm guessing I could find some kind of battery holder for the 12mm cell battery? Other Questions about my assumptions: Will I have enough storage left over on the flash space or EEPROM to store the data click after the sketch code has been loaded in? Will a watch battery provide enough energy to run this device all day? Is the Coin Cell Battery - 12mm the correct external power source for this project? I encourage any feed back, criticism, comments, help of any kind to move me along with this preparation so that I can move forward and purchase the parts I need. Thanks! Michael

Topic by mhussar    |  last reply

Getting started with PICAXE? Answered

I want to get started using PICAXE microcontrollers after using both PICs and AVRs before, and I have already learned the BASIC language, it's pretty easy, as the name would suggest. My main interests with them are that they can be easily programmed with two resistors and a 3-pin serial cable, they are easy to program and have ADC inputs, and also audio functionality. What would be a good place to get started, I was looking at the 08M, but it looks like it was recently discontinued and replaced by the M2. The reason I don't really want to move on is because I have just learned the pinouts and functions for the 08M, and also a lot of projects here on instructables utilize it. I was looking at building the tic tac tunes.I also noticed that it has the markings "12F683", so does this mean I could just buy a pic 12F683 chip and use it as a picaxe? Are they identical or is there a subtle difference in them. I also noticed that the audio functionality seems to be very limited in that the smaller chips only do polyphonic notes, and the mid sized chips only do mp3 from eeprom, and only the very large 40 pin chips do audio. What is the smallest chip that supports a full range sound file. Memory shouldn't be too much of a problem as the clip is only about a second long, so one with 256k should be fine, as long as it features internal audio. My last question is what should I buy, as in chips (universal and common experimentation chips), and any other accessories I may need. By the looks of things, all I need is the chip, a headphone socket, resistors, and a download cable.

Question by andy70707    |  last reply

assembly program

I have pic12f675. i have the neccessary asm and the header files.but i cannot compile it. please can you send me the hex file after compiling the program? as iam a student of class 8, idon't know how to compile. can you also send me the required steps? The required files are posted ;******************************* ;;LED FX.asm ;  11-3-2010 ;******************************* list p=12F629 radix dec include ""   errorlevel -302 ; Dont complain about BANK 1 Registers during assembly __CONFIG _MCLRE_OFF & _CP_OFF & _WDT_OFF & _INTRC_OSC_NOCLKOUT  ;Internal osc. ;_MCLRE_OFF  - master clear must be off for gp3 to work as input pin ;**************************************************************** ; variables - names and files ;**************************************************************** temp1  equ 20h ; temp2  equ 21h ; temp3  equ 22h ; temp4  equ 23h ; jump  equ 24h ;jump value for table1 fadeUp  equ 25h fadeDwn  equ 26h sequences equ 27h sw_duration equ 28h testing  equ 29h ;**************************************************************** ;Equates ;**************************************************************** status  equ 0x03 rp1   equ 0x06 rp0   equ 0x05 GPIO   equ 0x05    status  equ 03h option_reg equ 81h   ; bits on GPIO     pin7  equ 0 ;GP0  LED C pin6   equ 1 ;GP1  LED B pin5  equ 2 ;GP2  LED A pin4  equ 3 ;GP3  Sw A  pin3  equ 4 ;GP4  Sw B pin2  equ 5 ;GP5  Sw C     ;bits     rp0   equ 5   ;bit 5 of the status register ;**************************************************************** ;Beginning of program ;****************************************************************   org  0x00   nop   nop   nop   nop   nop   SetUp bsf  status, rp0  ;Bank 1           movlw b'11111000'  ;Set TRIS  GP0,1,2 out   GP3,4,5 input   movwf TRISIO         ;    bcf  status, rp0  ;bank 0   movlw   07h          ;turn off Comparator ports         movwf   CMCON        ;must be placed in bank 0    clrf  GPIO         ;Clear GPIO of junk   call _memory   btfss gpio,5   ;SwA to: "record new sequence"    goto record     btfsc gpio,3  ;SwC removes attract sequence   goto $+.10    movlw 0FFh   bsf  status,rp0 ;select bank1   movwf EEDATA        bcf  status,rp0 ;select bank0   movlw .101   bsf  status,rp0 ;select bank1   movwf EEADR      bcf  status,rp0 ;select bank0   call  write     movlw .101   bsf  status,rp0     movwf EEADR           bsf  EECON1,0 ;starts EEPROM read operation storing result in EEDATA        movf EEDATA,w ;move read data into w   bcf  status,rp0      xorlw .8   ;look for 8 - for Attract mode   btfsc 03,2   goto Attract_Seq ;selected sequence will appear first   goto  Main         ;**************************************************************** ;* Tables    * ;**************************************************************** table1 addwf   PCL,F           ;02h,1  add W to program counter   retlw   .10     ;   retlw   .50         retlw   .30     ;   retlw   .50         retlw   .100     ;   retlw   .40  ; program starts at bottom of table   retlw   .10     ;   retlw   .50         retlw   .30     ;   retlw   .50         retlw   .60     ;   retlw   .10     ;   retlw   .50         retlw   .10     ;   retlw   .50         retlw   .100     ;   retlw   .20     ;   retlw   .50         retlw   .30     ;   retlw   .50         retlw   .70   retlw   .60     ;   retlw   .100     ;   retlw   .50         retlw   .100     ;   retlw   .50         retlw   .100     ;   retlw   .70     ;   retlw   .50         retlw   .30     ;   retlw   .50         retlw   .70     ;   table2 addwf   PCL,F           ;02h,1  add W to program counter   goto seq1     goto seq2     goto seq3     goto seq4     goto seq5     goto seq6     goto seq7     goto seq8     goto seq9     goto seq10   goto seq11       goto seq12  ;**************************************************************** ;* Delays    * ;**************************************************************** _xuS movwf temp2 _uS  movlw .10   movwf temp1   decfsz temp1,f   goto $-1      decfsz  temp2,f   goto  _uS    retlw  00   _ZuS movwf temp2   goto $+2   goto $+2    decfsz  temp2,f   goto  $-3    retlw  00  _xmS movwf temp2 _x  nop   decfsz  temp1,f   goto  _x   decfsz  temp2,f   goto  _x   retlw  00     ;5mS delay for increments in timing for "New Sequence"   _5mS movlw 05h   movwf temp2 _5  nop   decfsz  temp1,f   goto  _5   decfsz  temp2,f   goto  _5   retlw  00     _10mS movlw 0Ah   movwf temp2 _10  nop   decfsz  temp1,f   goto  _10   decfsz  temp2,f   goto  _10   retlw  00    _50mS movlw .50   movwf temp2 _50  nop   decfsz  temp1,f   goto  _50   decfsz  temp2,f   goto  _50   retlw  00   _100mS movlw .100   movwf temp2 _100 nop   decfsz  temp1,f   goto  _100   decfsz  temp2,f   goto  _100   retlw  00     _150mS movlw .150   movwf temp2 _150 nop   decfsz  temp1,f   goto  _150   decfsz  temp2,f   goto  _150   retlw  00       ;**************************************************************** ;* Sub Routines    * ;****************************************************************    _memory        movlw .48   movwf temp1   movlw 2Fh   movwf fsr   incf fsr,f   movlw 0FFh   movwf indf   decfsz temp1,f   goto $-4   retlw 00        ;SwB puts current sequence into EEPROM for turn on.      ;and puts "marker" in location 101      Attract   movf sequences,w ;put sequence number into w   bsf  status,rp0 ;select bank1   movwf EEDATA        bcf  status,rp0 ;select bank0   movlw .100   bsf  status,rp0 ;select bank1   movwf EEADR      bcf  status,rp0 ;select bank0   call  write   movlw .8   bsf  status,rp0 ;select bank1   movwf EEDATA      incf EEADR,1      bcf  status,rp0 ;select bank0   call  write    nop   goto $-1   ;Project must be turned off       ;Seq selected as Attract will be displayed when project turned on     Attract_Seq   movlw .100   bsf  status,rp0     movwf EEADR           bsf  EECON1,0 ;starts EEPROM read operation. Result in EEDATA        movf EEDATA,w ;move read data into w   bcf  status,rp0   movwf temp4   movf temp4,w      call table2    goto $-2    ;record new sequence - looks for "no switch pressed" for 1.25 seconds to exit   ;uses files 30h to 5Fh  (48 files)   ;three files per "step"   1st file = LEDs,  2nd = Off time, 3rd = on time   ;15 steps allowed - look for 5Dh   record btfss gpio,5  ;wait for release of button A   goto $-1   movlw 30h   movwf fsr   ;start storage at file 30h      ;look at keys being pressed - identifies 2 or 3 keys pressed together    _r1  clrf sw_duration _r1a call _5mS   incfsz sw_duration,1  ;5mS x 256 = 1.25seconds   goto $+2   goto Store  ;time out! store files 30h to 5Fh in EEPROM    btfss gpio,5  ;see if one or more Sw is pressed   goto $+5   btfss gpio,4   goto $+3   btfsc gpio,3   goto _r1a  ;no sw pressed create 2.5 sec timing        ;1,2,or 3 sw pressed     call _10mS  ;delay to detect 2 or 3 switches   incfsz sw_duration,1   goto $+2   goto Main    btfsc gpio,5  ;SwA   goto $+2   bsf  gpio,0  ;turn on LED A    btfsc gpio,4  ;SwB   goto $+2   bsf  gpio,1  ;turn on LED B    btfsc gpio,3  ;SwC   goto $+2   ;   bsf  gpio,2  ;turn on LED C        ;LEDs have been illuminated         movf gpio,w    movwf indf   ;w moved to fsr's file (30h+)       incf fsr,f     movf sw_duration,w ;off time!!   movwf indf   ;w moved to fsr's file (30h+)      incf fsr,f    clrf sw_duration       _r2  call _5mS   incfsz sw_duration,1       goto $+2   goto record  ;time out! keys pressed too long. Start again   btfss gpio,5   goto _r2   ;sw pressed   btfss gpio,4   goto _r2   ;sw pressed   btfss gpio,3   goto _r2   ;sw pressed          ;file empty. Put duration into file   movf sw_duration,w ;on time      movwf indf   ;w moved to fsr's file (30h+)       incf fsr,f     movlw 5Dh   xorwf fsr,w   btfss 03,2      goto $+2   goto Store  ;stop at 15 steps. store files 30h to 5Fh in EEPROM      clrf gpio    goto _r1          ;sequences:       ;seq1 Self-Programmed sequence    ;1St file:LEDs  2nd file:OFF time  3rd file:On time    seq1 bsf  status,rp0     clrf EEADR    bcf  status,rp0    bsf  status,rp0       bsf  EECON1,0 ;starts EEPROM read operation. Result in EEDATA        movf EEDATA,w ;move read data into w   bcf  status,rp0      movwf gpio   bsf  status,rp0   incf EEADR,1        bsf  EECON1,0 ;        movf EEDATA,w ;move read data into w   bcf  status,rp0    movwf temp4 ;this is OFF time. Store it   bsf  status,rp0   incf EEADR,1        bsf  EECON1,0 ;        movf EEDATA,w ;move read data into w   bcf  status,rp0    movwf sw_duration ;this is ON time   call _5mS   decfsz sw_duration,1   goto $-2   clrf gpio   call _5mS   decfsz temp4,f ;create OFF duration   goto $-2    bsf  status,rp0   incf EEADR,1        bsf  EECON1,0 ;        movf EEDATA,w ;move read data into w   bcf  status,rp0     xorlw 0FFh ;look for 0FFh - end of routine   btfss 03,2   goto $-31   retlw 00          ;seq2  chase right - very fast     seq2 bsf  gpio,0   call _100mS   bcf  gpio,0   bsf  gpio,1   call _100mS   bcf  gpio,1   bsf  gpio,2   call _100mS   bcf  gpio,2   call _100mS   clrf gpio   retlw 00     ;seq3  chase right     seq3 bsf  gpio,0   call _150mS   bcf  gpio,0   bsf  gpio,1   call _150mS   bcf  gpio,1   bsf  gpio,2   call _150mS   bcf  gpio,2   call _150mS   clrf gpio   retlw 00     ;seq4  chase right with off-delay at end     seq4 bsf  gpio,0   call _150mS   bcf  gpio,0   bsf  gpio,1   call _150mS   bcf  gpio,1   bsf  gpio,2   call _150mS   bcf  gpio,2   call _150mS    retlw 00     ;seq5  left right left right   seq5 bsf  gpio,0   call _150mS   bcf  gpio,0    bsf  gpio,2   call _150mS   bcf  gpio,2      retlw 00       ;seq6  middle on   middle off   seq6 bsf  gpio,1   call _150mS   bcf  gpio,1   call _150mS     clrf gpio     retlw 00         ;seq7  All on   all off   seq7 clrf gpio   call _150mS   decf gpio,f   call _150mS   clrf gpio       retlw 00     seq8 ;seq8  middle on then sides on      bsf  gpio,1   call _150mS   bcf  gpio,1   bsf  gpio,0   bsf  gpio,2   call _150mS   clrf gpio       retlw 00     ;seq9  police flasher  3 times left 3 times right   seq9 bsf  gpio,0   call _50mS   bcf  gpio,0   call _50mS   bsf  gpio,0   call _50mS   bcf  gpio,0   call _50mS   bsf  gpio,0   call _50mS   bcf  gpio,0   call _50mS    bsf  gpio,2   call _50mS   bcf  gpio,2   call _50mS   bsf  gpio,2   call _50mS   bcf  gpio,2   call _50mS   bsf  gpio,2   call _50mS   bcf  gpio,2   clrf gpio   call _50mS      retlw 00     ;seq10  random flicker   seq10 movlw .32  ;start at bottom of table   movwf jump   bsf  gpio,1   movf jump,w ;put table jump value into w   call  table1   call _xmS   bcf  gpio,1   decfsz jump,f   goto $+2   retlw 00  ;top of table found   movf jump,w ;put table jump value into w   call  table1   call _xmS      goto $-11       ;seq11  slow fade up down   seq11 clrf fadeUp  ;   clrf fadeDwn   incf fadeUp,f ;to create 1 (delay routine does not like 00)   bsf  gpio,1   movf fadeUp,w   call _xuS   bcf  gpio,1   movf fadeDwn,w   call _xuS         decfsz fadeDwn,f ;   goto $-8   incf fadeDwn,f ;to produce 1   bsf  gpio,1   movf fadeUp,w   call _xuS   bcf  gpio,1   movf fadeDwn,w   call _xuS   decf fadeUp,f     incfsz fadeDwn,f    goto $-8     clrf gpio   retlw 00       ;seq12  fast fade up down   seq12 clrf fadeUp  ;   clrf fadeDwn   incf fadeUp,f ;to create 1 (delay routine does not like 00)   bsf  gpio,1   movf fadeUp,w   call _ZuS   bcf  gpio,1   movf fadeDwn,w   call _ZuS         decfsz fadeDwn,f ;   goto $-8   incf fadeDwn,f ;to produce 1   bsf  gpio,1   movf fadeUp,w   call _ZuS   bcf  gpio,1   movf fadeDwn,w   call _ZuS   decf fadeUp,f     incfsz fadeDwn,f    goto $-8     clrf gpio   retlw 00        ;Store   Store the 15 steps in EEPROM    Store bsf  status,rp0 ;select bank1   clrf eeadr        bcf  status,rp0 ;select bank0    movlw .48   movwf temp1   movlw 2Fh   movwf fsr   incf fsr,f ;fsr starts at file 30h   movf indf,w ;retreive data in file 30h   bsf  status,rp0 ;select bank1   movwf eedata  ;   bcf  status,rp0 ;select bank0   call  write   bsf  status,rp0 ;select bank1   incf eeadr,1        bcf  status,rp0 ;select bank0   decfsz temp1,f   goto $-10   goto Main       write bsf  status,rp0 ;select bank1   bsf  eecon1,wren ;enable write    movlw 55h   ;unlock codes   movwf eecon2   movlw 0aah   movwf eecon2   bsf  eecon1,wr ;write begins   bcf  status,rp0 ;select bank0  writeA btfss pir1,eeif ;wait for write to complete   goto writeA   bcf  pir1,eeif   bsf  status,rp0 ;select bank1   bcf  eecon1,wren ;disable other writes   bcf  status,rp0 ;select bank0       retlw 00           ;**************************************************************** ;* Main        * ;**************************************************************** Main clrf sequences   movf sequences,w   call table2   btfss gpio,5  ;Is swA still pressed?   goto $-3   ;SwA still pressed    movf sequences,w ;SwA released   call table2   btfss gpio,4  ;SwB puts current sequence at turn-on   goto Attract   btfsc gpio,5   goto $-5   ;SwA not pressed   incf sequences,f   movlw .12   xorwf sequences,w   btfss 03,2   goto $-12   goto Main      ;**************************************************************** ;*EEPROM           * ;****************************************************************           org  2100h                 END

Question by sahebpanda2001    |  last reply

Is there a way to save data onto an ATTINY85 chip, separate from your C program?

Hey everyone, this is my first post and I am not quite sure how to word this, so please bear with me. :) Here is the  ATTINY85 datesheet Basically, the long and short of it is, I made a simple USB HID Programmable Key-stroker Device. I used Macetech's capslocker for inspiration on the circuit design and then wrote my own program in C. Capslocker Design (Basically this design exactly except I have also added two zener diodes for voltage regulation on both USB data lines and a programming header) : However, instead of just sending Capslock on and off (like the Capslocker), this one allows you to send strings of text, combinations of keys, can switch to a mouse and I am currently adding a wireless receiver and RF remote trigger the device with the press of a button to mess with my boss. Currently, if I want to change the keystrokes or mouse movements I have to recompile and then burn the new software onto the ATtiny85 device. Instead, I am looking for an easier way to go about modifying the keystrokes that are saved on the device. Is there anyway to save data to a specific part of the ATTINY that would not require recompiling each time I wanted to update the recorded keystrokes? Or maybe a way to save a text file onto an ATTINY85 device that the C program could load? If not could this be done with an EEPROM? I have programming experience but I am reallllly green when it comes to AVR stuff, so I am not even sure what I should be looking for to accomplish this. Any nudge in the right direction would be appreciated. Thanks for reading and I love this community I have been lurking for quite some time and your posts have helped me quite a bit!

Question by DELETED_MakiY2    |  last reply

24 x 24 LED Matrix Project

I would like to share with you all an awesome project and some doubts and questions related to the same. This is a 24 x 24 LED Matrix project taken from here. All the data is taken from the same link. 24×24 LED dot matrix -->   This is pretty old circuit but I found it interesting to describe here. 24×24 LED display is formed by using 9 8×8 Dot LED matrix displays, that are connected to AT90S2313 MCU. MCU scans an indicator lines in series. Special PC program is written which allows drawing images on screen and transfer them via COM port to device. You can send images in series what gives an animation effect.   Circuit is was built using obsolete AT90S2313 MCU which can be replaced by Attiny2313 MCU with minor modifications of firmware. To make program work you event don’t need to connect device to computer COM port. You can store images in other master MCU EEPROM memory Each received byte from UART is immediately sent to 8 LEDs, second byte to next 8 LEDs and so on. Bytes has to be sent one by one without delay. USART is working at 115200 baud, 8bits, no parity. ---------------------------------------------------------------------------------------------------------------------------------- THE PROBLEMS >1>I really dont know if the circuit is good or not tell me if it is going to work. >2>I cant get 8x8 dot matrix displays so i am going to normal leds to a 24x24 one. >3>I have never worked with bus before (the bold red lines in the circuit) so i dont know how to connect it. >4>The schems are segmented i am finding it hard to figure out how to connect some of the segments. >5>Also i need to know how to hook it up to my pc. >6>I have never done programming so i need to know how to program the ic. THANK YOU I couldnt get the images uploaded nicely so i linked them. 1 2  

Topic by science_freak    |  last reply