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How to Build an 8-Bit Computer
you can use this code but it won't works if you use a delay because then you have to press the button at the right time aka after the code of the mode ended !!!
Mini CNC machine Arduino Based & Adafruit Driver Motor L293D v1 & 2*Mini Stepper CD/DVD player #1
Program an ATtiny44/45/84/85 with Arduino
BaW-Bot Part 1: Build an Arduino on a Board
Arduino Keypad Password
Arduino Motion Detector
$10 Arduino WiFi motion detector (PIR) that writes to SQL via cheap ESP8266 module
TV Out with Arduino
Dice ATTINY85 Charlieplexing
Arduino LCD Thermometer with LM35 Temp Sensor