Here’s Big Mess o’ Wires simple pressure and temperature demo:
I described an idea for a hiking data analyzer based around an old cell phone LCD, a pressure/temperature chip, and an ATmega microcontroller. Since then, I’ve received the parts and built a simple demo that exercises everything. It’s not very exciting yet, but it demonstrates that all the parts are working as expected, so now the real work can begin.
In the photo, clockwise from the upper-left, you can see the ATmega, LED used for debugging, Nokia 5110 LCD, Bosch BMP085 pressure/temperature sensor, and the ISP programming cable. The BMP085 is mounted upside-down, since direct light on the sensor can skew its measurements. A small 3.3v power supply is to the left of the board, not visible.