I love my Flipper Zero, I want to maximize its utility in every possible way. I use the great akopachov's Authenticator every day and Mayhem v2 adds everything else I need... however, living in Norway, in close proximity to Russia, there's one essential addition that I believe should be considered: a Geiger Counter.

I saw some great approaches to this, but I need something that just works, no fiddling around. The beauty of this Geiger Counter is that it seamlessly integrates with the Flipper, drawing power from it, uses its display, and stores the data to it. It's the perfect symbiosis, an essential addition to my toolkit.

The design is heavily based on schematics using a J305 Geiger–Müller tube for the flipper form factor.

Releases

Compatible apps

Geiger counter

This app gives you a graph view with counts per second (instantaneous measure of the radioactivity) as CPS and per minute as CPM.

There is extra functionality to record, zoom, change units, etc.

(credits to nmrr)

Atomic dice roller

With this app you can get a really random dice based on the geiger counter. Make your decisions and board games extra exciting.

(credits to nmrr)

Editions

You can make your own or support the project buying a kit or assembled unit.

The kit might be a bit challenging, keep this in mind, you need to be handy and a good problem solver. The 3d printed parts aren't included except on the fully assembled (Ultimate) edition. Get the 3d models to print your own following the Source code link at the bottom or directly here.

Ultimate

This is assembled, calibrated, tested and ready to use. Includes the case and a protector for the pins while is not being used.

Poverty (PCB)

In the Poverty edition, you only get the PCB. The smallest components are included and they are already soldered, you need to buy and solder the rest following the table below this section.

El Handy (KIT)

With El Handy KIT you get everything you need (except the 3d printed parts), you need to solder and calibrate, following the information below:

Components

These are the components locations:

Calibration

Only calibrate if you assembled the PCB. If it was pre-assembled, it is already calibrated. You need 50M ohm resistors and a multimeter. Check more details about the process here.

1) Keep the device disconnected from power. Remove the geiger tube if is installed

2) Adjust R100 to 50 ohms

3) Set the multimeter to VDC, highest range (i.e. 400V).

4) Connect GND to the multimeter (i.e. the left tube clamp)

5) Connect the positive tube clamp to the multimeter positive probe, using 50M ohm in resistors between them

6) Power the device and adjust R100 until your multimeter shows 57V (if is a 10M multimeter) or 6.5V (if is a 1M multimeter).

The device is now calibrated. Now you can place the geiger tube. You might add a dab of glue to hold the potentiomenter R100 in place.