A 19" rack cabinet filled with electronics and AVR microcontroller modules — I called it: The rack box project!
Serial interface module, with analog and digital I/O — AVR
![Serial interface module, with analog and digital I/O — AVR](https://blog.cavelab.dev/2009/03/avr-serial-interface-with-adc/cover_hu4f76d2c842191d8fee8d9556c8abd42f_635319_860x0_resize_q80_lanczos.jpg)
Serial (RS-232) interface module; providing 6 analog and 2 digital inputs, and 9 digital outputs. Uses an AVR ATmega8 microcontroller.
Serial port I/O module with 15 inputs — AVR
![Serial port I/O module with 15 inputs — AVR](https://blog.cavelab.dev/2008/10/avr-serial-interface-15-in/cover_hua530fc9c2d98f5dffa650cf9ea73b943_191106_860x0_resize_q80_lanczos.jpg)
Serial (RS-232) interface module; providing 15 digital inputs. Uses an AVR ATmega8 microcontroller.
Intruder alarm system controller — AVR
![Intruder alarm system controller — AVR](https://blog.cavelab.dev/2007/12/avr-intruder-alarm-controller/cover_hu422219be7974f8f7a1b7447d6121ae47_529639_860x0_resize_q80_lanczos.jpg)
A simple intruder alarm controller I build and used in my old apartment. Uses an AVR ATtiny2313 microcontroller.
Status panel for the Rack box project
![Status panel for the Rack box project](https://blog.cavelab.dev/2007/11/rack-box-status-panel/cover_hud4f9560d6e39bc2745f5308a2c611863_632786_860x0_resize_q80_lanczos.jpg)
A desk panel box full of LEDs, buttons and switches. Built for the rack box project.