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Control 30 buttons on 168 / 3286 analog pins based
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Application background Arduino. How to control more than 6 buttons with analoginput pins on Arduino UNO based or similar, without MEGA similar (only ATMEGA 168/328 based microcontroller)
With this method, connect max 5 buttons on one analog pin, analog pin 1=> button 1 =>2k resistor & analog pin 1=> button 2 => 2k resistor & analog pin 1 => button 3 => 2k resistor & analog pin 1 => button 4 => 2k resistor & analog pin 1 => button 5 => ground & 10k resistor on +5v
Repeat this for 5 other analog pins at your conveniance.
This source is created to receive only 4 buttons events on one analog pin. Key Technology arduino, UNO, atmega168, atmega328, buttons, analog read, analog entry, analog events, LCD, tips, tricks
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