RBG LED Button Matrix 4x4

This demonstrates a 4x4 button matrix. I went through several designs and like this one the best for its low pin count and easy expandibility. It's a cross between the Peggy 2 and Sparkfun button board, with my own hack for scanning the buttons. An AVR atmega16 controls a STP16DP05 chip and twelve transistors to read the buttons and animate the LEDs. An atmega168 (like in the Arduino) would be suited as well, as 15 digital outputs and 4 inputs pins are needed. The matrix can be expanded to 8x8 (192 LED elements, 64 buttons) without any extra components or pins used. The STP16 works both as a constant current sink for the LEDs and as a voltage output for the AVR to scan the buttons. With this hack, only 4 pins are used on the microcontroller to read up to an 8x8 matrix.

In this video there's 8 colors (green, blue, cyan, red, yellow, purple, white, off), but more are possible with software PWM.

Schematic will be posted on commonsound.com soon...

Category:

Science & Technology

Tags:

• Button
• Matrix
• RBG
• Sparkfun
• Peggy
• RGB
• LED
• AVR
• atmega
• arduino

[4mspedals]

It can be 8x8 without any extra chips or hardware... but i have a new version that can go bigger than that (am waiting for my boards to test it!) Parts cost is around $50, and MIDI in/out is simple. I'll post more!!

[MrTrollzz]

Make a rubix cube!!!!!!!!

[alfman111]

i want to make something like this. is it hard, and is it expensive. How do i start?

thanks

[JRHartly1984]

Hey man, I'm making a multiphonic cube that requires one face with a 4x4 led push button matrix to trigger samples and sequencers in Max. This is just the sort of stuff I've been looking for, where might I be able to get the materials/components to make your style of button matrix?

[jeffreysquared]

hi, i love this! you say you can read the button presses, so it should be possible to expand this using multiplexers,right? then you would have a monome without spending the $500 or the waiting list. how much would something like this cost, as in parts?