https://github.com/mic159/sparkfun_button_2x2
Sample Arduino code to drive the Sparkfun button pad 2x2.
https://github.com/mic159/sparkfun_button_2x2
Last synced: 4 months ago
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Sample Arduino code to drive the Sparkfun button pad 2x2.
- Host: GitHub
- URL: https://github.com/mic159/sparkfun_button_2x2
- Owner: mic159
- Created: 2013-11-02T08:11:28.000Z (over 12 years ago)
- Default Branch: master
- Last Pushed: 2022-10-28T13:03:29.000Z (over 3 years ago)
- Last Synced: 2025-06-05T11:07:37.531Z (about 1 year ago)
- Language: C++
- Size: 4.88 KB
- Stars: 3
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
Sparkfun Button Pad 2x2
=======================
This is sample code to drive the Sparkfun Button Pad 2x2 from an Arduino.
It lights up the LEDs different colors each time you press it.
Hardware
========
You will need:
- Button Pad
- Button Pad 2x2 (silicone pad): [Sparkfun](https://www.sparkfun.com/products/7836) || [Little Bird](http://littlebirdelectronics.com/products/button-pad-2x2-led-compatible)
- Button Pad 2x2 PDB: [Sparkfun](https://www.sparkfun.com/products/9277) || [Little Bird](http://littlebirdelectronics.com/products/button-pad-2x2-breakout-pcb)
- RGB LEDs (Common Cathode): [Sparkfun](https://www.sparkfun.com/products/9853) || [Little Bird](http://littlebirdelectronics.com/products/5mm-triple-output-led-rgb-common-cathode-20-pcs-pack)
- Diodes 1N4148: [DX](http://dx.com/p/in4004-1n4148-bat85-schottky-signal-diodes-3-x-20-pcs-152549)
- Top bezel: [Sparkfun](https://www.sparkfun.com/products/8746) || [Little Bird](http://littlebirdelectronics.com/products/button-pad-2x2-top-bezel)
- Right angle pin headers: [Little Bird](http://littlebirdelectronics.com/products/break-away-headers-right-angle)
- On the breadboard
- 100 Ohm Resistors x4: [DX](http://dx.com/p/diy-1-4w-resistance-metal-film-resistors-2500-pcs-152924)
- Arduino (I used a Nano): [DX](http://dx.com/p/arduino-nano-v3-0-81877)
- Wires: [DX](http://dx.com/p/arduino-dupont-4-pin-male-to-female-extension-wire-cable-40cm-10-piece-pack-140523)
- What you get for this depends on your use case, but I used these to plug into my breadboard.
Theory
======
To drive the LEDs we are going to use PWM/AnalogWrite to drive the common pin on each LED, then cycle through each color one at a time.
You need to put the resistors where it will not be supplying current for more than one LED at a time, so we put it on the common pins of each LED.
For reading the buttons, I used the [Keypad](https://github.com/Nullkraft/Keypad.git) library. It handles all the debouncing and pin IO for you, which is handy.
Wiring
======
| PCB Label | Arduino Pin |
| ------------- | ----------- |
| SWITCH | A0 |
| SWT-GND1 | A1 |
| SWT-GND2 | A2 |
| SWT-GND3 | A3 |
| SWT-GND4 | A4 |
| LED-GND1 | 3 |
| LED-GND2 | 5 |
| LED-GND3 | 6 |
| LED-GND4 | 9 |
| RED | 4 |
| GREEN | 7 |
| BLUE | 8 |