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home_automation:esp8266:hw:gosund_sp111:internals [2021/01/08 19:08] – created niziakhome_automation:esp8266:hw:gosund_sp111:internals [2021/01/08 19:17] (current) – niziak
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 [[https://github.com/xoseperez/hlw8012]] [[https://github.com/xoseperez/hlw8012]]
 +
 +===== Current measurements =====
 +
 +Maximum differential voltage measured on current shunt resistor is 43.75mV.
 +1mOhm resistor is enough to measure currents up to 30A.
 +
 +===== Voltage measurements =====
 +
 +Voltage is measured on V2P pin, which supports voltage range +-700mV. Datasheet recommends voltage divider of 5x470kOhm and 1kOhm. Scale factor is 2821 which convert 230V RMS into 82mV.
 +
 +