Greenway

Alexa Integration   Circuit Design We made an EVSE from parts on Banggood & Aliexpress mostly 16A 3.7 kW EV charging controller board + Type 1 EV  Current Sensor This is the key component for controlling charge level and auto shut off at the end of the charge. Probably saves a wee bit of energy with the power to the EVSE disconected in the off state also. Irms = emon1.calcIrms( 1480 ); // Calculate Irms only Kw = (Irms * 230.0 ) / 1000.0 ; float hours = (millis() - lastMillis) / ( 1000.0 * 3600.0 ) ; TotalChargeHours += hours; lastMillis = millis(); //CALC KWH if ( abs (Kw) > 0.1 ) KWh += (Kw * hours); Note: You must add a suitable burden resistor if one is not on the CT board already or the high voltage will damage the Arduino. The one shown has a burden resistor. PCB size 30.0mm X 24.0mm X 1.6mm Compatible interfaces 2.54 3-pin interface and 4-pin Grove interface Transformation coefficient 1000:1 Input current 0 - 5 A Output current 0 - 5 mA Sa