I thought I would go into more detail about my Wrist Mounted Computer project that I've been working on and off again for a bit. It is inspired by the Pip-Boy from the Fallout series, but I didn't want to make a replica. I wanted to make something that would be useful enough that I would want to wear it and not leave it to gather dust or be disassembled for parts later.
At it's core is a Raspberry Pi 4B with a custom program that gathers data from various sensors written in Python. It also can scan for Wifi networks, get the current weather and air quality, display a map of the surrounding area, and interface with Spotify. I also plan to have it capable of displaying notifications sent from my phone. For sensors it has, of course, a Geiger–Müller tube for measuring radiation and a SGP30 sensor for TVOC. I'm planning on adding a CO2 sensor, a PM 2.5 sensor (smoke has been a problem recently), a UV sensor, and a better temperature and humidity sensor since the DHT22 doesn't produce readings reliably. I also have a GPS module but I'm not sure how well it will work indoors, probably not that well.
One of the major concerns I have is battery life. I don't particularly want a giant battery strapped to my wrist. I will have to try and calculate how much power this thing will eat and also try to choose components that use as little power as possible. Right now I'm looking at a small 20000 mAh power bank, which may last about 10 to 12 hours based on my crude approximation of power usage. It would be a good idea to add a UPS module for backup power and to warn me I should probably start charging it again.
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