LED sink driver and Arduino question.?

Hi ... I would like to ask, if I can use 2 of these LED sink drivers uk.farnell.com/jsp/search/productdetail.jsp by using/controlling them just from 3 pins on my Arduino ??? I think, that it should be possible thanks to the pin22 SDO (datasheet www.farnell.com/datasheets/456099.pdf) ... what do you think ??? If yes, is there any limitation on HOW MANY shift registers/LED drivers you can connect "in a row" by using just 3 pins on Arduino ??? Could I use 4 of these drivers and control them just by 3 pins on Arduino ??? Thank you in advance for your answers...zholy

Asked by zholy 8 years ago

Unable to create instructables- Redirected to RegisterNew

Dear all, Since a week i am not able to make ANY new instructables on ANY of my Machines. The new instructable button simply re-directs me to- https://www.instructables.com/account/gopro?newMember=true I tried clearing the cahce, Cookies and trying it on 3 PCs that I have. Same problem. Please help.

Posted by bhvm 2 years ago

How would you register a custom built EV? Answered

How would you go about titling and registering a scratch built (Like, from tubing and such) electric vehicle? Since it would be made from scratch, it wouldn't have any VINs. Thanks. 

Asked by Zem 7 years ago

How to control 100 bidirectional DC motors?

Hi,  I'm trying to control 100 DC motors using a microcontroller (Arduino Mega) The motors run on 1.5V and have a operational current of 40mA. 1) Each motor must be able to rotate clockwise and counter clockwise 2) The motors must be able to move independently     (though direction of the motors at any one time will be the same)      eg. at time = 0; motor 1,20, 30, 45 will rotate CW            at time = 10; motor 20, 35, 80 will rotate CCW 3) Using minimum amount of pins from the Arduino (Shift Register ?) How should i go about doing this ? I have tried using L293D H-Bridge, but in order to control 100 motors,  i will need 50 H-Bridges and 200 digital output pins I'm thinking of a simpler circuitry (image attached) to control the motors. Digital output pins from the Arduino will contol the relay switches, and the DPDT relay will change the polarity of the the voltage supply. Will this work ?  Are there any smaller alternatives to the mechanical relay (transistor ?)  Can a transistor allow current flow in both directions ? I would really appreciate if you could provide some inputs and ideas as to how you would go about controlling a large amount of motors. Cheers!

Asked by fujiapple 3 years ago

Unable to Log In to Vote for Craftsman Contest

I have had several people inform me that after registering they could not acquire access to their account and they could not access to vote, as the system would not recognize them. Your comments and assitance appreciated. I am concerned because this may eliminate me from my entry qualifying for the next stage in the contest. https://www.instructables.com/id/How_To_Make_A_Custom_Fancy_Walking_Cane/

Posted by mmh 9 years ago

Re-purposing a scanner CCD into an analog shift register

How tough would it be to do that? Based on the research I've done so far, That could be one hell of a challenge for a noob like me. Knowing that, is there a part (preferably 8-bit and has lots of inputs/outputs) that would do the same thing for me? This will be used in a similar fashion as a CCD sensor setup, but light isn't the medium I want to measure

Asked by The Ideanator 7 years ago

I Need a little Help with Shift Registers

Hello, I'm both new to Instructables, and electronics in general. I'm trying to make a Divergence Meter, but I'm using LED's instead of nixie tubes. (It's safer for having my little cousins around.) I'm hoping to control each tube with one shift register per tube. Each tube will have 11 imputs and 1 output. I was curious if you guys had any tips on how to do that with the standard 16 pin registers, or if you could direct me to one that could do it. Thanks.

Posted by Glyngsdal_inovations 3 months ago

I Need a Little Help with Shift Registers

Hello, I'm both new to Instructables, and Electronics in general. I'm trying to make a Divergence Meter, but I'm going to be using LED's and etched acrylic instead of Nixie tubes. (It's safer for having my little cousins around.) I'm hoping to control each tube with one shift register per tube. Each tube will have 11 inputs and 1 output (11 LED's 0402 type). I was curious if you guys had any tips on how to do that with the standard 16 pin registers, or if you could direct me to one that could do it. Thanks.

Posted by Glyngsdal_inovations 3 months ago

How to drive serial data via (shift registers) AVR?

Is there some sort of code that will allow easy serial data tranfser from an AVR to a shift register (specifically the max6921 driver)? Thanks

Posted by guyfrom7up 9 years ago

Can the LP3943 source current as well, or only sink it? Answered

The link to the data sheet is here. All it talks about is sinking current, so my guess is yes.  I really wanted to use two of these to get a huge multiplexed array of LEDs, but one of them would need to be able to source the current, can it with the pins set high?  If not, are there other ICs like this that can do so? Thanks!

Asked by mojofilta 6 years ago

no progress registered for lessons taken.? Answered

Why is my lesson progress stuck at 36%. I've gone through all the lessons multiple times.

Asked by dtierce 1 year ago

Which pins are which on a shift register? What pins on a 74HC595 shift register are the data, clock, and latch pins? Answered

I just bought an arduino and was trying to do this tutorial https://www.instructables.com/id/Arduino-Expermentation-Kit-How-to-get-Started-wi/step7/8-More-Leds-74HC595-Shift-Register-CIRC05/ . I have hit some trouble though and I am confused when it comes to the shift registers. When he says to connect to the clock pin, do we connect to the SCK (Shift Register Clock Input) or the RCK (Storage Register Clock Input)? When he says to connect to the data pin, do you connect to the SI (Serial Data Input)? Also what does he mean when you say to connect to the latch pin? The data sheet for the Digikey shift register I am using is in the link below.http://www.fairchildsemi.com/ds/MM/MM74HC595.pdf?

Asked by Stoned 8 years ago

Arduino Vu meter/Mood light?

Hello There :) I have this concept: A wall to ceiling light that consists of several segments that are lit with rgb leds. I want it to have two modes - VU meter mode and rgb mode (goes through rainbow of colours) I know how to do each separately: -VU meter - There is an instructable I can follow -RGB mode -Using shift registers etc.. But I don't know how to incorporate them together. Can I use a shift register and an arduino (through PWM) to give functionality of both settings I would like? Thanks, Joe

Asked by joearkay 6 years ago

Can I change the email that my account is registered with?

As the title implies, Can I change the email that my account is register on? I don't want to make another account just change the email, is this possible? Thanks for any help;) 

Posted by Team Dogoman RC 2 years ago

Shift register too slow for multiplexing?

Hi, I'm trying to figure out working with shift registers. I bought a couple of 74HCT4094's, hooked them up through my breadboard to a small matrix with some LEDs and my Arduino. Without multiplexing everything works fine, but no matter what circuit I build (changing wires, resistors, transistors, even the Arduino code), when I start to multiplex the LEDS clearly 'flicker' (is that the correct term?). Is it possible that some shift registers are 'too slow' for multiplexing with Arduino?

Posted by Huibgeboers 5 years ago

register as a class in school for Arduino challenge?

There is a motivated group of students that would like to enter as a class to the Arduino challenge.  Is there a way that could happen?

Asked by hsbtech 6 years ago

¿Website in register an application? Answered

I don't know what website to put for the application registration. What should I put there? The same question of the callback URL. Thank you.

Asked by Javier AlejandroB 1 year ago

Forgot My Registered Email, Can't Log In!

I forgot my password AND forgot my registered email.  I created a new account but would really like to get back into my ORIGINAL account.  Sent my original account a "personal message" hoping it would be forwarded to my registered email account, but no luck.   Can't find a link to send an email help request of instructables.  Ideas?

Posted by DocRon 8 years ago

Registering in AutoDesk to get Fusion 360? Answered

Hello!I'm registered in AutoDesk, but after logging in as student to download Fusion 360, I'am asked to add an educational institution. I don't find "instructables.com" in the list. How can I fill in the form to arrive to the download page?Many thanks in advance for your help and congratulations for your lessons.

Asked by canario1000 1 year ago

Comments don't register

Not sure if it is just me or not, but for the last 6 months or so, whenever I comment it never gets registered as a comment in the instructable. Example~ www.instructables.com/id/How-to-Create-Your-First-Website/                      www.instructables.com/id/Compact-Camera-Bottom-Ball-Grip/   These now have atleast 1 comment from me, yet still register 0 comments on the recent I'ble screen. The comment in the thread appears fine. I know this is not such a great importance, yet when I comment, I specifically try and draw attention to an I'ble with no comments. The cause is not helped if it still registers no comment... If you could help out that would be tops.... Thanks guys and gals. : )

Posted by Lftndbt 8 years ago

Registering to see all steps

Maybe this has a topic already, if so, I apologise! I think it must be new, having to register to see all steps. I don't like it! Annoying for when I'm at school and don't want to log in and just generally inconvenient. I think it might put new people off using instructables because registering just to see how to do a project is quite a turn-off. I know the service is free and I feel bad only ever making a contribution to complain! Instructables is a great site and one of my most visited, I really do love it! Anyway, just my thoughts.

Posted by unigamer 10 years ago

Knex voice chat

Download the client : clientregister : registerafter installing, log inthen click Voicethen go to the bottom and click Add then click " by searching "and search for knexpert then add to public servers

Posted by Katarukito 9 years ago

Why now "View all steps on one page" works only for Pro Members!?

Before it was for registered...AND I REGISTERED JUST TO BE ABLE TO DO THAT!

Asked by LeonimuZ 8 years ago

Can a shift register be too slow for multiplexing?

Hi, I'm trying to figure out working with shift registers. I bought a couple of 74HCT4094's, hooked them up through my breadboard to a small matrix with some LEDs and my Arduino. Without multiplexing everything works fine, but no matter what circuit I build (changing wires, resistors, transistors, even the Arduino code), when I start to multiplex the LEDS clearly 'flicker' (is that the correct term?). Is it possible that some shift registers are 'too slow' for multiplexing with Arduino?

Asked by Huibgeboers 5 years ago

decoder ?

Hello , I  am going to make  decoder  for micro controller ,   I want to know how does decoder make for  microcontroller I have 4 registers I =Instruction Register A= Address register R1= register R1 R2 =register R2 Logic 0= deactivate Logic 1= activate I     A   R1    R2        out 1   1    1         0            1     //  mov R1 1   1    0          1           1     // mov R2 I AR1R2        out 0000                 0000000000000001 0001                 0000000000000010 0010              0000000000000100 0011              0000000000001000 0100             0000000000010000 0101             0000000000100000  0110             0000000001000000  0111            0000000010000000  1000            0000000100000000   1001             0000001000000000 1010             0000010000000000 1011            0000100000000000 1100            0001000000000000 1101            0010000000000000 1110            0100000000000000 1111           1000000000000000 If I know input than how to know what will decode ?

Asked by vead 3 years ago

Wiring a wav playing setup and shift register to the same arduino?

I just ran into an issue with my current setup for a project I've been working on. I would like to hookup a wav playing setup (either the Adafruit Wave Shield or a wav playing setup like this) Issue I'm having is I can't change the pins around for the shift register setup (which I have setup and working just like I like!).  I know this is probably a stupid question (what with stacking shields for the uno) but could I wire up multiple items to the same pin? IE wire pin 12 to both a shift register and a wav playing setup? If not, is there some way around this that would work on a micro that would not mean having to jump to a mega. Thanks!

Asked by DoctorWoo 3 years ago


It malfunctioned, it shortly registered with the blue light, it intermittently went out shortly after when vista was on. is it an electronic fault? got the latest patches but it doesn't even register as it tells me it has malfunctioned, tempted to pull it apart and look at the wiring particularly the usb part. any advice would be the best, thanks for reading

Asked by 8 years ago

Pesky shift registers? Answered

I started working with 2 74HC595N to control 8x8 matrix, and found that instead of a dot it activates multiple rows. So I assumed this was due to my lack of knowledge about shift registers so I setup a simple scenario from arduino ShiftOut tutorial (single register chip and 4 LEDs controlled by number via serial input i.e. "one by one sketch". Thats when I found out that shift register has almost random values on its output pins. Some LEDs were on, some off before I started to controll them. After I turned on/off all 4 it strated to work as supposed to, but last pin retained "memory" of its state even if I reset Arduino.  So my question is, do I always need to initialize every pin of every shift register (and is there an example sketch), or do I have faulty IC? Edit: Added schematic (it's from http://arduino.cc/en/Tutorial/ShiftOut)

Asked by bratan 5 years ago

Creating and Registering a Trademark

Does anyone know and understand the process of creating a trademark? As best as I can gather creating a trademark is as easy as putting TM after what ever you would like trademarked. However, if you wish to register your trademark so you can have the R behind it that is where the line starts to blur and become a little more fuzzy. There are some fairly expensive fees as well as quite of bit of research that you first must do or face losing your $300+ fees.  So if anyone has had anything registered with the Us Copyright and Trademark office please share your experience. 

Posted by xtreker15 6 years ago

Problem on creating new account with Safari (snow leopard)

I can't register using Safari Browser on Snow Leopard. It redirect me on the homepage once I click the register button. So I used Firefox instead.

Posted by gnetro 8 years ago

Combinational Lock using shift registers

Last year, i made the circuit of this already but now my brother is asking for my help and i cannot remember it now. im focusing right now in programming and forgot my logic circuit skills..please help me to remember this... what i remembered is that i have shift registers that memorized the buttons (0-9) i pressed...then i enter again a sequence of numbers and the device will check if it corresponds to the numbers i entered...the led will light if it is correct and will not if the numbers entered did not match the default numbers... i still have the list of some materials, 3 universal shift registers, 1 nand ic, 3 xnor ic, 10 toggle switch and 1 hold switch..  its not a very complex circuit..my only problem is to remember on how will i work with the shift registers... please enlighten me once again

Posted by eaon21 7 years ago

Shift Register and Relays? Answered

Using a 74hc595 shift register to a ULN2003 darlington array to control 7 relays, all controlled by an MSP430, connected via RJ11.  The relays are controlling LED Christmas light strings on and off.  Everything seems to be functioning so far but the problem is that relays that aren't being told to turn on sometimes are turning on.  The shift register is connceted with Qa to the master reset of the register so I can clear is quickly, but so far I have been just leaving it high.the other 7 outputs (Qb - Qh) connected to the base pins of the ULN2003 (B1 - B7).  The outputs of the ULN2003 connected to the relay coils, COM connected to 5v, emitter connected to ground.  I have tried pull down resistors on the base pins, I have tried tweaking the code which I tried to set up to just bit bang the shift register, make it as simple as possible just to test it and a sample is provided below for one iteration.  I have it looping through several of these to turn a single channel on each time to check to make sure all the channels work.  It however sometime make a channel just flicker, not turn on at all, or turns several channels on at the same time.  I am curious as to whether this is a hardware problem (pullup/down resistors, filtering caps, more clamping diodes then what is built into the ULN2003, whatever) or whether I am just an incompetent programmer.  I am fairly certain the problem lies somewhere between the driver seat and the steering wheel though.  One thought I had but do not want to try right away is it possible the shift register is bad?  Overheated from soldering?  I try to solder one pin on chips, then a pin on another component, then a pin on the opposite side of the chip, etc to keep chips cool when soldering them, but are the 74hc595 very heat sensitive maybe?  Would appreciate a fast answer, looking to build 5 more of these so I can control all my Christmas lights. This was supposed to be a cheap and dirty project so I didn't get into Triacs and dimming, I just want to turn lights on and off as I see fit.   i = 30000;   P1OUT = 0x00;        //Channel 7 (unused)   P1OUT |= 0x02;       //Clock in   P1OUT &=~ 0x02;   //Clock low   P1OUT = 0x01;        //Channel 6 (Green Wreath)   P1OUT |= 0x02;       //Clock in   P1OUT &=~ 0x02;   //Clock low   P1OUT = 0x00;        //Channel 5 (Red Icicle)   P1OUT |= 0x02;       //Clock in   P1OUT &=~ 0x02;   //Clock low   P1OUT = 0x00;        //Channel 4 (White North)   P1OUT |= 0x02;       //Clock in   P1OUT &=~ 0x02;   //Clock low   P1OUT = 0x00;        //Channel 3 (White South)   P1OUT |= 0x02;       //Clock in   P1OUT &=~ 0x02;   //Clock low   P1OUT = 0x00;        //Channel 2 (Blue North)   P1OUT |= 0x02;       //Clock in   P1OUT &=~ 0x02;   //Clock low   P1OUT = 0x00;        //Channel 1 (Blue South)   P1OUT |= 0x02;       //Clock in   P1OUT &=~ 0x02;   //Clock low   P1OUT = 0x01;        //Channel 0 (Clear All/Active Low)   P1OUT |= 0x02;       //Clock in   P1OUT &=~ 0x02;   //Clock low   P1OUT |= 0x04;       //Latch outputs   P1OUT &=~ 0x04;   //Latch low   while(i > 0)   {         i--;   }

Asked by Electric Spectre1 1 year ago

Now that there are "Go PRO!" stuff does that mean that i will be treated like an unregistered member?

(quote begins here)Pro Features IncludePDF DownloadsAllsteps PreferenceRich Media VersionPro BadgeDigital PatchesLess AdvertisingPrivate ProjectsMembers-only ForumsFavorites List(Quote ends here)I remember that before i registered i had to register to see all steps on one page and(i think) PDF download of Instructables out there So i registered Here And Loved it.But Now, Pro?Does that mean that just members will be treated by the system like an unregistered member by not having all steps on one page and such?this is really dissapointing, More ads Everywhere and now You have to pay?This is looking like on of those sick websites that have questions that you have to register to see the answers, And then you have to pay to your registered account to really see answers.

Asked by ReCreate 8 years ago

Antics help!! Please Read

Umm, i just found this website called antics3d.com, and the software that used to be able to be downloaded for free, you now have to have a registered email from befor the site closed back in 08. i just found the website today, so i dont have a registered email. i am hoping that if somebody has a registered email, they would let me use it to download the new antics v5.1 and content pack. i have already checked the torrent sites i know about, but if you have a registered email or torrent site that you know offers antics, or even are willing to send me the setup exe, please private message me telling me where to get it. thanks!

Posted by A.C.E. 9 years ago

Fusion 360 license? Answered

I cannot seem to register the education Fusion 360 software. It wants the name of the educational institution.

Asked by DigitalJakeT 1 year ago

Resistance? Answered

I am confused. When the flex sensor is straight and taut, should that register the most resistance and therefore the smaller voltage output?

Asked by Reyce 1 year ago

Shift Registers vs LED Drivers?

I am trying to figure out how to program an arduino to control LEDs. Basically, what I have done, is I have made a 3x3 matrix and can program some simple sequences with the LEDs using the digitalWrite and delay functions.  I'm not even sure that this is the right way to do this, I don't think it is, but it works.  Anyway I want to try to program bigger matrices and maybe LED cubes using my arduino, but without using up all of the output pins. So, I've came across two ways to get more outputs from less pins; LED drivers and shift registers.  These may be the same thing and I'm just not aware.  But anyway, is there a difference between them? I've really only found information about shift registers, nothing really about LED drivers.  Is one easier to program? Does one use less pins than the other? Or are they just the same thing?

Asked by texpert 3 years ago

maker space website

What are the requirements for the maker space website(used to register a team)? would a facebook page work?

Posted by JpsManCave 1 year ago

I give up where do I find out what classes I am registered for?

I have looked everywhere under settings etc to find what classes I am registered for this is very annoying. Even the app doesn't have a setting for it. 

Posted by CarmenL10 1 year ago

Pro membership discounts? Answered

Hi!  Just wondering, are the discounts the same every time you register a pro membership? 

Asked by simon.w.nordberg 3 years ago

Classes vs. Webinar? Answered

Hi, just a simple question for you.I enrolled to classes and I have access to all lessons.What about webinars? Are they supposed to provide additional information than standard classes?Am I required to register to webinars? Alternatively, could I access to webinar video in future without registering/attending them live?Thanks for the replyRegardsAlessandro

Asked by adm0586 1 year ago

8 bit Instruction set ?

Hello experts I need some help I want to make 8 bit instruction using folloing component so I made one simple example 8 bit instruction set 4 bit opcode + 2 bit source register +2 bit destination register+ 4 bit data accumulator A memory register R1 memory register R2 memory register R3 opcode         source       destination       data 0010               00               00                 xx                  R1  01           A  01                xx                  R2  10               XX                xx                  R3  00               XX                xx load data directly into R1 mov R1#data opcode     source      destination       data 0010         R1 01          00                  data load data directly into R2 mov R2#data opcode     source      destination       data 0010         R2 10          00                  data load data directly into R3 mov R3#data opcode     source      destination       data 0010         R3 11          00                  data load data directly into A mov A#data opcode     source      destination       data 0010            00         A  01                  data mov the content of R1 into Accumulator mov A, R1 opcode     source      destination       data 0010         R1 01          01                  disable mov the content of R2 into Accumulator mov A, R2 opcode     source      destination       data 0010         R2 10          01                  disable mov the content of R3 into Accumulator mov A, R3 opcode     source      destination       data 0010         R3 11          01                 disable don't use any register disable opcode       source       destination       data 0010               00               00                 xx      don't use register

Asked by vead 3 years ago

Cannot login from "Register or Login" at top of site, only inside of site.

I click login, enter my info, hit login, and loads the */gifts/*  page instead of the home page but does not log in. If i go to a function within the site that requires login, it works just fine. This just started when the */gifts/* started being used.

Posted by scottrules 7 years ago

accumulator # immediate data ? Answered

Hello , What I need to know  if I want to load the immediate value  into the accumulator accumulator # immediate data accumulator is  8 bit, assume  address of accumulator is  11 10 01 01 temporary register is  8 bit  that hold Immediate data 00 00 00 11 Instruction register example LD A, # 00 00 00 11 this is 2 byte instruction first  byte is 11 10 01 01 second byte is 00 00 00 11 lets assume that first byte is opcode , store into instruction register  This is the first instruction fetch cycle. fetch , decode , and execute how to decode and execute the first byte instruction

Asked by vead 3 years ago

Newbie Alert!Is it possible to make a 8x8 led matrix with 74hc595 shift registers w/ arduino?

If so can someone help me with the schematic? And also I'm using an arduino uno r3 if that helps? I kind of would need help with the programming as well. I have transistors (2N3904) and resistors (100 Ohm/200 Ohm) too.  Thanks for the help!

Asked by scooter2013 4 years ago

Bug report: Comment "post" button doesn't register with first click?

I've noticed this recently - the "post" button doesn't seem to register at all the first time I click it when posting a comment, even if I'm pretty patient and wait a good 10 seconds or so. Sometimes, clicking the button again will then suddenly result in duplicate comments being posted. It looks like other people might be having the same problem - for example, here the comment "could i make arduino on paper like this" is posted three times in a row: https://www.instructables.com/id/1-DIY-Conductive-Ink/ Anyone else have this problem? I'm running the latest version of Firefox (30.0).

Posted by Ben Finio 3 years ago