Tagged Questions

1
vote
1answer
73 views

How do I control a seven segment display with a shift register and an Arduino?

I recently purchased 4 seven segment displays from sure electronics. They came with their own shift register board which combines the 74HC595 IC with the ULN2003. I want to be able to tie into this ...
-4
votes
1answer
218 views

I'm driving a large 7-segment display using a microcontroller [closed]

I've seen that others are using TPIC6a596, a combo 74HC4511+ULN2003A, and also TLC5916. Just to confuse things more (for me anyways), there are also MAX7219 ICs that seem appropriate (maybe not for ...
2
votes
4answers
374 views

Need a LED Display

PROJECT: I'm building a Digital Clock controlled by a Arduino micro-controller. I want it to display the hours, minutes and seconds on a LED Digit Display. Therefore, I need to have several digits, ...
3
votes
2answers
305 views

Reverse engineering a 12 pin LCD?

I just found a broken "laser projecting alarm clock". I took it apart, and am interested in only the laser projection arm. This consists of a laser diode (although I suspect that this is actually just ...
3
votes
1answer
499 views

Driving 3 digit seven segment using Arduino Uno R3 and a Demux

I have to light up 3 digit 7 segment displays using Arduino Uno R3. I have got myself 3 BCD-to-7 segment display decoders. I figured I need a 4-to-16 Decoder, so I bought one and it turned out that it ...
2
votes
1answer
122 views

Strange Results With a 3x7 Segment LEDs

I'm trying to get a CPS03631BR 3 digit 7 segments LEDs to work. I've wired it to my Arduino UNO like this: And I'm using this code, which should light all the LEDs digit-by-digit, then light ...
1
vote
1answer
652 views

How to connect this 7 segment LED display to Arduino?

I have the following LED display, which I want to hook up to Arduino UNO. According to datasheet, there is clock pin. Do I have to build external clock source for it or I can feed it from Arduino? ...
1
vote
1answer
448 views

Multiple 4-Digit 7 Segment Displays with Arduino

I have 3, 4-Digit 7-Segment Displays from Adafruit, and the included docs/ libraries say I should connect the display to pins A4 & A5. However, I have three of the displays, so I am looking for a ...
2
votes
2answers
538 views

Can't figure out this seven segment display

I recently bought four of these seven segment displays: http://www.electrokit.com/en/leddisplay-7segment-58mm-red-green-ca.49450 I'm having no luck however to make it to work, and since there is no ...
3
votes
5answers
3k views

How to power 24 7-segment displays with Arduino?

I'm working on an Arduino project where I need to power 24 7-segment displays (model Kingbright SC56-11YWA). I decided to control them using 8 bit shift registers (model 74LS164N). This is ...
1
vote
1answer
1k views

Arduino + Max7221 + Common anode 4-digit 7-seg LED array?

I'm trying to hookup a common anode 4-digit 7-segment LED array to my Arduino via a Max7221 IC. Here's a hard-to-see (sorry!) pinout for my LED array (my LED array is the bottom common anode one, ...
4
votes
4answers
892 views

What's the best way to connect a 4-digit 7-Segment LED to Atmega168

I'm working on a device with a 4-digit 7-segment counter and wondering what is the best way to drive all the LEDs. Right now I have a custom PCB that's driving them all from an Atmega168, using most ...
2
votes
1answer
2k views

MAX7219 Arduino Issue with 7 Segment display

I have followed the tutorial here MAX7219 Now when i wire it up to a 4 Digit 7 Segment display, and run any code changing the display I get all the segments on all digits lit up ...