My build description is being documented in the “TOS Tricorder Where have you been all my Life” thread. I have not discussed electronics there yet.
I’m an engineer (we will however not discuss the perceived quality of my engineering skill), and as such, If I’m going to build a tool, I want a tool not a toy, and I want it to work. At the same time, I don’t feel like having PCBs designed and created. So everything I plan to use will be off-the-shelf parts. Parts I have collected, in general terms, include basic temp, pressure, humidity, 6,9 and 10 axis acceleromters, a big pile of MQ style gas sensors, visible light, IR and UV detectors, visible and IR camera, GPS, AM/FM radio, ultrasonic, laser, microwave and a Type 5 Geiger counter. I also picked up a 12$ ultrasonic construction distance meter with a guide laser (I really want to include this one as its good out to 60 METERS indoors). I also got an EMF reader, a QI charger and a metal detector. Huh, lot of stuff there. Most is sourced from Adafruit and Sparkfun, with some interesting tidbits from Banggood.
(BTW, did you know that the MQ sensors all appear to have exactly the same operating circuit requirements? ie, I think you can put a socket in you device, and pop the sensors in and out at need.)
I do not have one of those sexy new spectrometers or the muon detector UCF is working on. I’m looking for a reasonable CO2 and O2 sensor, because I would be much more interested in O2 content of my environment. However, I know from work that O2 sensors degrade over time (at least they do on our industrial multigas meters). A straight up Nitrogen sensor might be almost as much good in that case.
I haven’t decided if I want to mess with Bluetooth, LoRa or Wifi yet. I believe I can place the batteries (flat lipo types) into the side panels (the black part).
I’m not sure how much I can fit or power in the unit yet. But, since I’m 3d printing my tricorder, if I need a “little” more space, I can always just print out a slightly larger model. Right now I’m staying with the “standard” size unit.
I’m aiming for two modes of use. Play for demo purposes with TOS computer sounds and classic screens, and Real mode where I can use all the sensors.
In real mode I want my tricorder to tell me things I could not determine on my own. After all, I already know if its day or night, hot or cold. So I want to know how far is that thing in front of me, will I get a sunburn, should I be breathing this air, where am I, which direction should I go. I’ve seen field strength meters on radios, so that combined with the GPS and compass, it should be possible to walk sideways for a little bit, take another reading and determine a direction and distance from where you are to your signal source. Which is exactly what they used it for on TV.
RE the Metro - it has the same pinout as the Uno, and since I’m mainly messing with Adafruit products, and they designed and build the controller, I think their libraries will do the job. BUT, you are much further along on the electronics side than I am. I’m still struggling with the TFT as I think I have a cold solder joint somewhere.