Instructions | SaferSpace

1

Get the assembled board

Source&assemble it yourself or buy some from me
2

Flash the firmware with your UUID into the ATTiny

There's a default-pinout 2x3 socket for ISP on the board. Just plug a USB-ISP in according to the pinout and you're good to go!
3

Connect the board inside the device in question

If there's 5V inside the device, connect it directly. If there's only 220V, add a sufficiently trustworthy 5V PSU as described in "details". Either way, make sure that the antenna of the NRF module can actually transmit - i.e. you're not putting it inside a fully-metal case.
4

Turn it on and test if the packets are received at the base station
5

Test whether the device sends the "shutting down" packet

If it doesn't, make the storage capacitor larger until it does. Suitable storage capacitors can be sourced from PC motherboards - they're low-voltage and high-capacity, just like expected here. If the "shutting down" thing fails, the device will still work - just that the power cut-off will not be detected instantly.

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