Description Based on HLW8012, single phase energy monitor IC. SOP8 package and simple perpherial circuits. Need to invasive to AC main power. VBe very careful when use it because of the HIGH AC voltage. Output power, or current or voltage directly by frequency, which can be read by MCU like arduino. Current sense by sample resistor voltage sense by resistors net. Board dimension is 40 x 23 mm. Current used sample resistor is 2mR, 0.002R, 20A, 5% tolerance. Demo code (check in wiki page) support ESP8266 remote debug via telnet, safe to read data when mains AC power connected. According to application note, the power supply of hlw8012 must be not isolated, read more information on wiki page. Documentation, demo video, use guide please see here. Energy meter board series： HLW8032 Opical-coupler version. HLW8032 Isolated version. HLW8012 energy sensor.
