A digital ambient air data logger built on Debian.
This is the California Air Resources Board, environmental digital data logger (CARBLogger) project which develops and maintains an open source, shell-script based digital data acquisition and reporting system.
OW Baby is OneWire Slave implementation for PIC16F628 and similar Micro-controllers. With it, you can rule your ultra cheap MCU with using One Wire protocol. ASM language and IRQ used. Code works on 4Mhz internal clock.