MicroGeiger: A geiger counter running on MicroPython

Summary

This is a DIY-style geiger counter, which utilizes a SBM-20 Geiger tube to detect beta and gamma radiation. Utilizing a nRF52840 and ILI9341 touchscreen display, users can control and monitor radiation levels around them, while being able to also optionally log the data to a supported Bluetooth device.

All future source code relating to this project can be found here.

Notes

• This project originally used a ESP32 feather board, which would also allocate enough pricing to include a spare SBM-20 tube. Due to supply issues, I’ve switched to using a nRF-based feather board and removed the spare tube from the order.
• Although my original plan was to use a VFD display which would look more visually appealing, I’ve settled instead for on a TFT display, which should be more than enough to handle button presses.
• In the future, I may create a more permanant enclosure to store the parts inside; I’m going to use a black case from Adafruit to contain the counter, for now.
• I have yet to locate a test isotope in order to ensure my counter can successfully operate. If I’m unable to locate a legitimate sample, I’ll disassemble a smoke alarm and use it’s Americium sample.

Plan

My plan is, as followed:

• Order parts from suppliers
• Test parts(primarily the tube) to ensure working order
• Assemble geiger counter
• Bootload MicroPython and flash program code
• Share source & design with Hack Club!

Budget