PZEM-004T V3

Resistor divider circuit is used for Voltage measurement mechanism, If the Line to Line voltage is below the recommended 250VAC it will not burn.

Go through this code I used it previously for my project it contain the Energy Reset, Power alarm functions.

#include

#define ENERGY_RESET_PIN 12 //Energy reset pin connected to switch(change this pin no. as per your use)
#define POWER_ALARM_PIN 11 //Power alarm pin connected to speaker (change this pin no. as per your use)
#define POWER_ALARM_THRESHOLD 170 //Set this value in watts

PZEM004Tv30 pzem(9, 10);

void setup() {
Serial.begin(115200);
pinMode(ENERGY_RESET_PIN, INPUT_PULLUP); //set energy reset pin as input
pinMode(POWER_ALARM_PIN, OUTPUT); //set power alarm pin as output
pzem.setPowerAlarm(POWER_ALARM_THRESHOLD);
}

void loop() {
/*Measure Voltage*/
float voltage = pzem.voltage();
if (voltage != NAN) {
Serial.print(“Voltage: “); Serial.print(voltage); Serial.println(“V”);
} else {
Serial.println(“Error reading voltage”);
}

/*Measure Current*/
float current = pzem.current();
if (current != NAN) {
Serial.print(“Current: “); Serial.print(current); Serial.println(“A”);
} else {
Serial.println(“Error reading current”);
}

/*Measure Power*/
float power = pzem.power();
if (current != NAN) {
float power_temp = (power / 14) * 0.70; //This is a calibration constant for power, for every 14 watts we are adding 0.70.
power += power_temp;
Serial.print(“Power: “);
Serial.print(power);
Serial.println(“W”);
} else {
Serial.println(“Error reading power”);
}

/*Measure Energy*/
float energy = pzem.energy();
if (current != NAN) {
Serial.print(“Energy: “); Serial.print(energy, 3); Serial.println(“kWh”);
} else {
Serial.println(“Error reading energy”);
}

/*Measure Frequency*/
float frequency = pzem.frequency();
if (current != NAN) {
Serial.print(“Frequency: “); Serial.print(frequency, 1); Serial.println(“Hz”);
} else {
Serial.println(“Error reading frequency”);
}

/*Measure Power Factor*/
float pf = pzem.pf();
if (current != NAN) {
Serial.print(“PF: “); Serial.println(pf);
} else {
Serial.println(“Error reading power factor”);
}

/*Get power Alarm Status*/
bool power_alarm = pzem.getPowerAlarm(); //Read power alarm status
if (current != NAN) {
if ( power_alarm == 1)
{
Serial.print(“power_alarm: “);
Serial.println(power_alarm);
digitalWrite(POWER_ALARM_PIN, power_alarm); //If power alarm status is 1, Write HIGH to buzzer pin
}

else if (power_alarm == 0)
{
Serial.print(“power_alarm: “);
Serial.println(power_alarm);
digitalWrite(POWER_ALARM_PIN, power_alarm); //If power alarm status is 0, Write LOW to buzzer pin
}
}

/*Perform Energy Reset*/
bool val = digitalRead(ENERGY_RESET_PIN); //Read ENERGY_RESET_PIN
if (current != NAN)
{
if (val == 0)
{
pzem.resetEnergy(); // if ENERGY_RESET_PIN is LOW reset energy
Serial.println(“ENERGY RESET”);
}
}

Serial.println();
delay(2000);
}