Sonoff POW R3 25A 5500W Power Monitoring Switch Module (POWR3)
Sonoff POW R3 25A 5500W
GPIO #Component
GPIO00 Button 1
GPIO01 CSE7766 Tx
GPIO02 None
GPIO03 CSE7766 Rx
GPIO04 None
GPIO05 None
GPIO09 None
GPIO10 None
GPIO12 Relay_i 1
GPIO13 Led_i 1
GPIO14 None
GPIO15 User
GPIO16 User
GPIO17 User
{"NAME":"Sonoff POWR3","GPIO":[32,3072,0,3104,0,0,0,0,256,320,0,1,1,1],"FLAG":0,"BASE":43}
For more accurate energy consumption measurements this device requires power monitoring calibration.

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Serial Flashing

No soldering required as the headers are present (at least on my unit).

Video instructions by NotEnoughTech