Dr. Ayman Shalaby over at Electronics Lab has posted an article describing EGYDuino, an Arduino compatible board that can be build using home process: EGYDuino is a DIY Arduino clone made on a single sided PCB board. It’s simple and cheap to build using home PCB fabrication methods and it’s 100% compatible with Arduino.
Cmdrk33n hacked the avr-cdc library to add the RS232 DTR signal output to one of the pins on his ATtiny MCU. Only a few lines of code need to be changed to implement his solution. Demonstrated in the above video is the DTR signal turning the LED on whenever a terminal window (connection) is opened. […]