Posted: October 4, 2009

Introduction

This is just a simple circuit using a keypad from SparkFun. Basically this circuit and firmware allows the user to type a 4 digit number and press * to save it into the eeprom of an Atmel ATtiny2313 (only if the program pin (PD3) is held low). Then if the user types the code and presses the # key, the PD4 pin will go high for 1 second so that it could be hooked up to a relay of a garage door opener system.

Pictures

The schematic.

Source code
garage.asm

Copyright 1997-2024 - Michael Kohn