Ct_clamp not reading zero at zero current

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ESPHome adc scatter is too big

ESP ADC has a voltage range of 0 … 1V. Some ESP boards already include a voltage divider, i.e. D1 mini has a divider 220k : 100k which results in a range of 0 … 3.2V on its A0 pin. In this case you can further extend the range by adding a single resistor (NOT another voltage divider) in front of A0. This resistor adds to the internal 220k. In case of noisy measurements on ADC please also consider RF interference. After all your measuring input is just millimeters away from a bursting WiFi ante…