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Question by Arya42   |  last reply


How to run an Arduino Due for user defined time?

I am using an Arduino Due for waveform generation on my Nokia lcd 5110 display.I want to generate the desired wave for a stipulated duration where time is taken as input .Kindly help me with this asap,also include code for the same if possible.

Question by Lakshya1503   |  last reply


Is it possible to generate and display waves using the same arduino due board in real time???

OK!So I intend to design an Arduino Waveform Generator interfaced with the Nokia LCD 5110 with Keypad support.I have successfully incorporated the Keypad interfacing part but have stumbled upon waveform display on the Lcd. My program generates waves on DAC1 which i then give as input on the Analog(A0) pin of Arduino Due just like an oscilloscope takes an input externally.i tried merging it with another program which takes an analog input from the function generator and displays it on the LCD.More importantly,the programs work fine individually! So,is it possible to do this on the same board????Where could i possible be going wrong? Reply asap !!

Question by Lakshya1503   |  last reply


ARDUINO TIMING HELP?

Guys can you help me out with some code on arduino timing.I want my Arduino Due to perform a set operation(say blinking an LED) for user defined time ie. It should ask the user to enter the time he/she wishes to run the thing.Thanx..

Question by Lakshya1503   |  last reply


ARDUINO OSCILLOSCOPE?

Hey there, I have been working on a recent project to build an Arduino Oscilloscope interfaced with a 4X4 keypad membrane with Nokia 5110 LCD display.I have successful individual code fragments/portions which 1)Generate waves interfaced with the keyboard  2)Display the same on the Nokia LCD 5110 i am using the Arduino Due and the 1st part of my code generates waves on DAC1 with the code as follows:- #include "Waveforms.h" #include #include //Set the desired duty cycle in percentage double dc,t,a,d; long d_milli,d_micro,a_milli,a_micro,m,n; int stage =0; int sample_delay1; LiquidCrystal lcd(A2, A3, A4, A5, A6, A7); float sample_delay; String num1,num2; int wave1; String wave_name; double duty_cycle,k; const byte ROWS = 4; //four rows const byte COLS = 4; //four columns //define the cymbols on the buttons of the keypads char hexaKeys[ROWS][COLS] = {   {'1','2','3','A'},   {'4','5','6','B'},   {'7','8','9','C'},   {'.','0','#','D'} }; byte rowPins[ROWS] = {23,25,27,29}; //connect to the row pinouts of the keypad byte colPins[COLS] = {31,33,35,37}; 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                wave_name ="Sinusoidal";                 Serial.println(wave_name);               }               else if(key == 'B')               {                 wave1 = 1;                 lcd.clear();                 lcd.setCursor(0,0);                 lcd.print("Triangular?");                 wave_name ="Triangular";                 Serial.println(wave_name);               }               else if(key == 'C')               {                 wave1 = 2;                 lcd.clear();                 lcd.setCursor(0,0);                 lcd.print("Sawtooth?  ");                 wave_name ="Sawtooth";                 Serial.println(wave_name);               }               else if(key == 'D')               {                 wave1 = 3;                 lcd.clear();                 lcd.setCursor(0,0);                 lcd.print("Square?    ");                 wave_name ="Square";                 Serial.println(wave_name);                               }               else if(key == '#')               {                 stage++;                 //lcd.clear();                 lcd.setCursor(0,1);                 lcd.print("Frequency=");                 Serial.println("Frequency=");               }         }        else if(stage == 1)         {               if(key != NO_KEY &&(key=='1'||key=='2'||key=='3'||key=='4'||key=='5'||key=='6'||key=='7'||key=='8'||key=='9'||key=='0'))               {                 num1 = num1 + key;                 //int numLength = num1.length();                 //to adjust one whitespace for operator                 lcd.setCursor(10,1);                 lcd.print(num1);               }                             else if(key == '#')               {                     k = num1.toInt();                     Serial.print(k);                                                                                        int sample_delay_int = 1000000/(k*120);                           float sample_delay_float = 1000000/(k*120);                           float difference= sample_delay_float-sample_delay_int;                           sample_delay1 = sample_delay_int - 6;                           if(difference > 0.5)                           {                             sample_delay1++;                           }                                                                               Serial.println(sample_delay1);                           lcd.clear();                           lcd.print(wave_name);                           lcd.setCursor(0,1);                           lcd.print("Frequency=");                           lcd.print(num1);                           lcd.print(" Hz");                                         break;                                       }                   }                                                 }       } void loop()   {   analogWrite(DAC1, waveformsTable[wave1][i] );    i++;   if(i == maxSamplesNum)  // Reset the counter to repeat the wave     i = 0;   else delayMicroseconds(sample_delay1);                   } Next, I input these waves from DAC1 into analog input A0 to display on the LCD with code as below:- #include #include #include #define DISPLAY_WIDTH 84 #define DISPLAY_HEIGHT 48 #define ARDUINO_PRECISION 1023.0 Adafruit_PCD8544 display = Adafruit_PCD8544(8,9,10,12,11); //Analog Pins int channelAI = A0;      // probe #define DELAY_POTENTIMETER //disabled it I don't have it connected #ifdef DELAY_POTENTIMETER int delayAI = A1;       // delay potentiometer #endif float delayVariable = 0; float scale = 0; int xCounter = 0; int yPosition = 0; int readings[DISPLAY_WIDTH+1]; int counter = 0; unsigned long drawtime = 0; unsigned long lastdraw = 0; int frames = 0; void setup(void) {   display.begin();   display.setContrast(30);// you might have a slightly different display so it might not be the optimal value for you   display.clearDisplay(); } void loop() {    #ifdef DELAY_POTENTIMETER   delayVariable = analogRead(delayAI);   delayVariable = (delayVariable/100);   #endif   scale = (float)(DISPLAY_HEIGHT-1)/ARDUINO_PRECISION;     //record readings   for(xCounter = 0; xCounter <= DISPLAY_WIDTH; xCounter++)   {                                     yPosition = analogRead(channelAI);     readings[xCounter] = (yPosition*scale);     #ifdef DELAY_POTENTIMETER     delay (delayVariable);     #endif   }     display.clearDisplay();   //Draw Voltage Ref Lines   display.drawLine( 10, 0, 10, DISPLAY_HEIGHT-1, BLACK);   display.drawLine( 5, (DISPLAY_HEIGHT-1)-(.2 *ARDUINO_PRECISION * scale), 10, (DISPLAY_HEIGHT-1)-(.2 *ARDUINO_PRECISION * scale), BLACK);   display.drawLine( 0, (DISPLAY_HEIGHT-1)-(.4 *ARDUINO_PRECISION * scale), 10, (DISPLAY_HEIGHT-1)-(.4 *ARDUINO_PRECISION * scale), BLACK);   display.drawLine( 5, (DISPLAY_HEIGHT-1)-(.6 *ARDUINO_PRECISION * scale), 10, (DISPLAY_HEIGHT-1)-(.6 *ARDUINO_PRECISION * scale), BLACK);   display.drawLine( 0, (DISPLAY_HEIGHT-1)-(.8 *ARDUINO_PRECISION * scale), 10, (DISPLAY_HEIGHT-1)-(.8 *ARDUINO_PRECISION * scale), BLACK);   //display.drawLine( 5, (DISPLAY_HEIGHT-1)-(.84 *ARDUINO_PRECISION * scale), 10, (DISPLAY_HEIGHT-1)-(.84 *ARDUINO_PRECISION * scale), BLACK);     //Draw Voltage Ref Numbers   display.setCursor(0,((DISPLAY_HEIGHT-1)-(.2 *ARDUINO_PRECISION * scale))-3);   display.print((int)(5.0*0.2));   display.setCursor(0,((DISPLAY_HEIGHT-1)-(.4 *ARDUINO_PRECISION * scale))-3);   display.print((int)(5.0*0.4));   display.setCursor(0,((DISPLAY_HEIGHT-1)-(.6 *ARDUINO_PRECISION * scale))-3);   display.print((int)(5.0*0.6));   display.setCursor(0,((DISPLAY_HEIGHT-1)-(.8 *ARDUINO_PRECISION * scale))-3);   display.print((int)(5.0*0.8));     for(xCounter = 0; xCounter <= DISPLAY_WIDTH; xCounter++)   {     display.drawPixel(xCounter, (DISPLAY_HEIGHT-1)-readings[xCounter], BLACK);     if(xCounter>1){       display.drawLine(xCounter-1, (DISPLAY_HEIGHT-1)-readings[xCounter-1], xCounter, (DISPLAY_HEIGHT-1)-readings[xCounter], BLACK);     }   }   //Draw FPS   display.setCursor((DISPLAY_WIDTH-1)-11,0);   display.print(frames);     //Draw Voltage   display.setCursor(((DISPLAY_WIDTH-1)/2),0);   display.print(analogRead(channelAI)/ARDUINO_PRECISION*5.0);     display.display();     //Calculate FPS   drawtime = micros();   frames=1000000/*a second*//(drawtime-lastdraw);   lastdraw = drawtime; } Now the problem arises when i try doing the 2 things on d same arduino due board. I got perfect results when i used arduino due and arduino uno simultaneously but have not been able to generate waves on the LCD using the same board. Is it possible to do the same. Can some1 help me incorporate the 2 programs into 1..Thanxx

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