The nRF24L01+ module (sources (archive.org)) is a really cheap & easy way to achieve wireless communications. With the internal antenna, the reach is about 100m (open area), with an extra antenna it’s apparently 1100m+.
Required pins with fix locations / can’t be moved:
- MISO -> 12
- MOSI -> 11
- SCK -> 13
- MISO -> 50
- MOSI -> 51
- SCK -> 52
Configurable, can use any available digital pins; this is a suggestion:
- CE -> 8
- CSN -> 7
Note: Not all Arduinos can supply 3.3v directly (for example, the Nano only supplies it when powered via USB), making a 3.3v supply uses few cheap parts so don’t break it with 5v :-).
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