This is my very first construction with the cheap Atmel’s ATtiny15 and the DS1820 thermometer. The main goal was the BIG display from the 7-segment LED modules. (And cheap + simple construction, of course…)
My thermometer is really simple, but efficient. It contains from three parts: A display , an outdoor thermosensor and a main board. Construction is as simple as it can be – the AVR reads the temperature from the 1-Wire thermometer and sends necessary data to the display.
The display is made from two dual 7-segment LED displays. I made simple 1-sided PCB with these LEDs and one 40-pins header, regardless “logic”, just simple wired. This display board is connected with the main board by the cheap and common 40wired flat ribbon cable, used in the PCs to connect an ATA (IDE) disk to a motherboard.
Thermometer with DS1820 + ATtiny15 - [Link]