By Leff
This is hardwares needed:

hard wire: Uno x2, APC220 x2
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Use the default setting on the wikifor two APC220 boards.

Code for Arduino:
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1 You can see the two LED on pin13 are flashing every 2 seconds.

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2 Open the Arduino IDE serial monitor of "Receiver", you could find the picture below.

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Another post related to APC220.