WTF - Walking Turtle Finder v1

At first, since I don't have a 3D printer and a suitable transmitter box yet, I made its body in the most awkward way: wrapped the board with electrical tape (but without covering the battery itself so it can be easily pulled out).

And the receiver body was made of ..... a thread spool! Yes, such a silicon spool can be cleverly cut and turned into a device case. It looks like a well-designed backpack for a turtle. Black stretch bands are fixed in the case with metal braces, and their length can be adjusted to suit a specific turtle.

The first prototype uses the FS1000A radio modules. That is the cheapest but not a reliable option because these modules are very sensitive to power voltage stability, so there was a trouble with the switch: the device worked bad and it was very difficult to determine, why. But the issue was in the switch - it's replacement to a simple breadboard wires fixed the bug.

At first I wanted to power the receiver from a CR2302 battery, but its power was not enough for the DC-DC step-up converter to supply a stable voltage for the radio module, so I had to use one AAA battery instead.