Arduino 220V AC Power meter using PZEM004T Library :  https://github.com/olehs/PZEM004T Part list: Arduino board LCD 16x2 PZEM004T module Resistor 220 ohm Potentiometer 10K Video:  CODE: #include <SoftwareSerial.h> // Arduino IDE <1.6.6 #include <PZEM004T.h> #include <LiquidCrystal.h> LiquidCrystal lcd(7, 8, 9, 10, 11, 12); PZEM004T pzem(2,3);  // (RX,TX) connect to TX,RX of PZEM IPAddress ip(192,168,1,1); void setup() {   Serial.begin(9600);   pzem.setAddress(ip);   lcd.begin(16, 2); // lcd rows and columns    } void loop() {     float v = pzem.voltage(ip);   if (v < 0.0) v = 0.0;   Serial.print(v);Serial.print("V; ");   lcd.setCursor(0,0);   lcd.print("V= ");   lcd.setCursor(2,0);   lcd.print(v);   float i = pzem.current(ip);   if (i < 0.0) i = 0.0;   Serial.print(i);Serial.print("A; ");   lcd.setCursor(9,0);   lcd.print("A= ");   lcd.setCursor(11,0); ...
 
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