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Her finder du en masse om arduino som jeg har programmeret i og undervist maker folk i.

Cheap & Easy Arduino Sensor

If you want to try out a Cheap and Easy arduino sensor you can find a BB-FRM9x-x on ebay and a atmel328p-pu.

My focus was to find a cheap, easy to program and low current solution for everyone ...

The BB-FRM9x-x do have a voltage regulator so it means that you can supply with 3.6 volts to 5 volts.

I can get it down to 13uA with 3.6 Volts in sleep mode.