Monitors the Rack box status panel, IR sensor, porch door and turns off lights. Uses an AVR ATtiny2313 microcontroller.
Multiplexer output extender
Get more digital outputs on your I/O device with a multiplexer, 3 outputs turned into 7.
Sound alarm control unit — AVR module
Simple unit to control three sound signals; beep, siren and buzzer. Uses an AVR ATtiny2313 microcontroller.
Fan controller with LCD — AVR powered
Reads temperature and controls a fan using a PWM output, fan and alarm set point can be adjusted and is shown on a LCD. Uses an AVR ATmega8 microcontroller.
Emergency power off controller — controlled by 555 timers
Emergency stop controller for the rack box project. Uses two 555 timers.