Quantity   Component name
1 × Pro Trinket - 3V Microcontroller
1 × BMP 180 Digital pressure and temperature sensor
1 × HP QDSP-6064 bubble display A tiny, 4-digit, 7-segment numerical indicator. Can be found on Sparkfun
4 × 330 ohm Resistors
1 × Power source 4v to 16v I'm using 4AA batteries