PZEM004T v3: Energy Monitoring Basics

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#include <PZEM004Tv30.h>

PZEM004Tv30 pzem(Serial2, 16, 17);
void setup() {
  Serial.begin(115200);
}
void loop() {
  Serial.printf("V=%.1fV I=%.3fA P=%.1fW\n", pzem.voltage(), pzem.current(), pzem.power());
  delay(1000);
}