hlw8012 | HLW8012 library for Arduino and ESP8266

hlw8012 is a C++ library typically used in Internet of Things (IoT), Arduino applications. hlw8012 has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has low support. You can download it from GitHub.

HLW8012 library for Arduino and ESP8266 using the Arduino Core for ESP8266. This is the IC present in some chinese products like Itead's Sonoff POW. The HLW8012 is a current, voltage and power monitor IC that outputs a pulse of a frequency inversely proportional to the value to be read. This IC provides two PWM outputs, the first one for power and the second one for current or voltage, depending on the SEL pin. The output values are always RMS. Power measurements are very consistent but current or voltage measurements require a minimum time lapse after changing the SEL pin value to become stable. This fact reduces sampling frequency. Higher values (of power, current or voltage) mean shorter pulses. These ratios are per datasheet typical application, but the actual circuitry might be different. Even if the circuit matches that on the datasheet the IC tolerances are quite loosy (+-15% for clock frequency, for instance).