PZEM-004T v3.0 and NodeMCU / Wemos Mini running on Blynk - How To procedure

[Phil2020]

Hi Pete

Thanks for the clarification however i do have it connected as you have noted.

Phil

[unkown2]

@4eyes

The problem only solved by read 2 registers Value High and Value Low then combine them

Please tell me where you need to add what would work?

[Morgan_Flint]

You need to add this.
According to the next post by 4eyes it worked for him

[unkown2]

OK. I realized this when I found your post above. Thanks.

    void pzemdata(){

    result = node.readInputRegisters(0x0000, 10);
    
    if (result == node.ku8MBSuccess)  
    {
    voltage_usage      = (node.getResponseBuffer(0x00) / 10.0f);
//    current_usage      = (node.getResponseBuffer(0x01) / 1000.000f);
//    current_usage_h      = (node.getResponseBuffer(0x02) / 10000.000f);
    current_usage_l_h      = ((node.getResponseBuffer(0x01) + (node.getResponseBuffer(0x02)*65532)) / 1000.000f);
//    active_power       = (node.getResponseBuffer(0x03) / 10.0f);
//    active_power_h       = (node.getResponseBuffer(0x04) / 100.0f);
    active_power_l_h       = ((node.getResponseBuffer(0x03) + (node.getResponseBuffer(0x04)*65532)) / 10.0f);
//    active_energy      = (node.getResponseBuffer(0x05) / 1000.0f);
//    active_energy_h      = (node.getResponseBuffer(0x06) / 10000.0f);
    active_energy_l_h      = ((node.getResponseBuffer(0x05) + (node.getResponseBuffer(0x06)*65532)) / 1000.0f);
    frequency          = (node.getResponseBuffer(0x07) / 10.0f);
    power_factor       = (node.getResponseBuffer(0x08) / 100.0f);
    over_power_alarm   = (node.getResponseBuffer(0x09));
    }

  Serial.print("VOLTAGE:           ");   Serial.println(voltage_usage);   // V
  Serial.print("CURRENT_USAGE:     ");   Serial.println(current_usage_l_h, 3);  //  A
  Serial.print("ACTIVE_POWER:      ");   Serial.println(active_power_l_h);   //  W
  Serial.print("ACTIVE_ENERGY:     ");   Serial.println(active_energy_l_h, 3);  // kWh
  Serial.print("FREQUENCY:         ");   Serial.println(frequency);    // Hz
  Serial.print("POWER_FACTOR:      ");   Serial.println(power_factor);
  Serial.print("OVER_POWER_ALARM:  ");   Serial.println(over_power_alarm, 0);
  Serial.println("====================================================");
}

[lyl8000]

How to reset Energy counter with ModbusMaster? I couldn’t find any.

[PeteKnight]

Read this:

Problem PZEM-004T Version 3.0

make a wiring connection for PZEM-004 v3.0 and ESP8266: (either NodeMCU and Wemos) ESP8266 5V ==> PZEM 5V ESP8266 G ==> PZEM GND ESP8266 Rx ==> PZEM_Rx -> D6(GPIO12 - Tx) ESP8266 Tx ==> PZEM_Tx -> D5(GPIO14 - Rx) #include <SoftwareSerial.h> SoftwareSerial pzem(14,12); // (RX,TX) connect to TX,RX of PZEM for ESP8266 bare board void resetEnergy(uint8_t slaveAddr){ //The command to reset the slave's energy is (total 4 bytes): //Slave address + 0x42 + CRC check high byte + CR…

Pete.

[lyl8000]

Thanks a lot! It works!

[unkown2]

The reset occurred again. Please tell me what could be the problem?

[unkown2]

@unkown2

active

Code.

[morun]

Hello everyone , please I just baught pzem-004t V3 and when I interface it with esp8266 it doesn’t work.Just RX on pzem blinks and TX is not . Pleaase any help !!!

[proxcentaur]

how did u solve this ? i got the same problem

[Ahmadfauzy]

hy pete , i was follow your instruction to make sure both file are in the same folder location , but "settingPZEM.h still can read on arduino

[PeteKnight]

My guess is that the file you’ve created is actually called settingPZEM.h.ino

The best way to create these additional files is to use the drop-down arrow in the top right…

and choose “New Tab” and give it the desired name and paste your code into it.

Pete.

[Ahmadfauzy]

hy pete ,i got the error message again about D5,D6 ,as we can see in the picture , can you help me again pete for solve this problem

[PeteKnight]

You probably chose “generic ESP8266” as your board type in the IDE when you compiled the sketch.

Generic ESP8266 doesn’t support the “D” number designations for pins, so choose a more appropriate board type.

Pete.

[Ahmadfauzy]

hey pete ,what shoul i do ? if i get this error message ?

[PeteKnight]

Totally delete your Blynk for Chinese library.

Pete.

[Ahmadfauzy]

hy pete i was deleted the chines blynk as your instruction ,and then what should i do ?

[PeteKnight]

Copy the full compiler output text (not a screenshot) and post it, with triple backticks at the beginning and end of the text, so that it displays correctly.

Triple backticks look like this:
```

Pete.

[Ahmadfauzy]

[Unformatted compiler output deleted by moderator]