Tagged Questions

0
votes
0answers
50 views

Multiplex data and LED pin

I'm looking at performing a chip conversion for the Sparkfun LED RingCoder. The sample code provided with the product works well on an Arduino UNO, but it uses a pin for each I/O - 5 pins for the ...
0
votes
1answer
27 views

R-EXT connection on the STP16CP05MTR LED sink driver

I'm planning to use a STP16CP05MTR LED sink driver to drive some LEDs in a matrix. The STP16CP05MTR supports constant current by the use of an external resistor ...
2
votes
2answers
144 views

Driving 3.3 V LEDs with an Arduino and a shift register

I'm planning to build a simple LED matrix with an Arduino and some 74HC595 shift registers. However my Ardiuno outputs 5 V to the registers which will pass that 5 V on. How and where along the line do ...
0
votes
2answers
274 views

coding using Arduino, two 74HC595 and two RGB LED, problems with shifting out database

the whole point of this was to be able to send 8 bits of color code to 2 rgb leds through 2 74hc595 registers. if i can get the default color for each led to be sent out then the next part of code is ...
8
votes
2answers
412 views

LED Multiplex Anode-Row Driver

I'm helping build this art installation that amounts to a large 16 x 16 pixel display. I settled on using 16 TI TLC5926 constant current driver chips chained together to give me direct drive to each ...
3
votes
1answer
165 views

Long Chains of Shift Registers

I want to set up an LED display, and I'm looking at using a bunch of 16-bit LED driver chips (like TI TLC5927) to run a 16x16 LED matrix. Then I'd like to maybe put a few of these 16x16 displays ...
1
vote
2answers
277 views

Is is possible to communicate over 1 XBee to multiple microcontrollers?

MC1>XB1 ==> XB2>MC2,MC3,MCn What I am looking to do is control large LED panels, wirelessly, with control of each LED pixel. My concern is the processing limitations of a single controller and/or the ...
3
votes
3answers
544 views

3 RGB-LED with only 3 resistors

I have 3 RGB LEDs with common anode, a shift register and a microcontroller. Currently I have connected a series resistor for each cathode of the RGB LED, so there are 9 resistors in sum. I wondered ...
1
vote
2answers
770 views

Digital Clock Circuit

I am making a solid wood clock using minimal components. So far, I thought of using 21 LEDs to make 7 segment displays (3 LEDs for each segment (overall 63 LEDs for the displays)), 6 LEDs for the 1 in ...
2
votes
2answers
410 views

Algorithm for simulating PWM through 595's

I am trying to get a sort of pwm effect in an led matrix controlled by shift registers. I don't need super fine control, so I'm only shooting for around 16 brightness levels. For a 24 row matrix, ...
0
votes
1answer
510 views

Chaining limit for shift registers in large led matrix

I am thinking of trying to build a large led matrix in a way that is both modular and scalable (maybe up to around 100x100, or 500x16). My thought is to make a single 8x8 module that I can make a few ...
5
votes
3answers
2k views

POV globe speed questions

I am planning on creating a RGB LED POV globe only physically larger then that one. I am planning on using 64 RGB LEDs, requiring 3x pins per LED for a total of 192 outputs. Obviously I am going to ...
3
votes
1answer
280 views

Playing with a shift register and some LEDs

Building on this question, I've now got a shift register to play with, and I've been trying to work it manually with a couple of switches, like so: I have resistors (2.2K) between the switches and ...
2
votes
1answer
483 views

How to switch/power a 13x13 LED Matrix?

Hey all - I have an AVR project in mind that will require a 13 by 13 LED matrix of bright white LEDs. I'll be wiring up my own matrix to do this (not using premade 8x8's). I plan on using some shift ...