Support for PZEM 004T Energy monitor

[gajotnt]

Is it possible to have this FW for 1mb ROM?

[ruben_ramos]

Hi aleph0,
Can you tell me how connect pzem 004t to esp (my is a Wemos D1 mini)?
TX to GPIO 14 and RX to GPIO 12? only that? Directly without any resistance?

Thanks

[aleph0]

@ruben : yes, I connected them directly without resistor to a wemos d1 mini. Pzem is powered with 5v, I read somewhere the wemos can handle 5v on the gpio pins, I wanted to test. So far it's working fine, but it's only ~20 days of continuous power up. We will see if it last

@gajotnt : I'll try to compile for 1Mb and tell you what. Will be on weekend !

[gajotnt]

@ruben : yes, I connected them directly without resistor to a wemos d1 mini. Pzem is powered with 5v, I read somewhere the wemos can handle 5v on the gpio pins, I wanted to test. So far it's working fine, but it's only ~20 days of continuous power up. We will see if it last

@gajotnt : I'll try to compile for 1Mb and tell you what. Will be on weekend !

Thanks

@Ruben_Ramos, bom ver um Tuga

[ruben_ramos]

I think have something wrong..
Give me values -1


my connections are:



thanks for help

[ruben_ramos]

Thanks

@Ruben_Ramos, bom ver um Tuga

Yeap , tem de ser...

[aleph0]

I think have something wrong..
Give me values -1


my connections are:



thanks for help

You have inverted the pins on the white connector. Look carefully on the PCB, the pins are identified with numbers and meaning

[ruben_ramos]

i have noticed that, and changed, but without success.. continue the same, give me -1.
How to know if pzem its working good? or its damaged?

[giruchile]

Hello,

I have a wemos connected to a pzem running a few months ago, this sends the information to a PC with domoticz who keeps track of these variables.

esp 1.JPG

esp 2.JPG

esp3.JPG

esp4.JPG

[ruben_ramos]

giruchile can you show how you had connected pzem to wemos?

[giruchile]

Hello,
for the connection I did it directly, but with 3.3v and I put a resistance in parallel within the pzem, the idea is that the optocoupler is running with 3.3v and not with 5v as it comes originally.
Now I'm not at home, I can barely get a picture of the change I made.

[ruben_ramos]

I appreciate that!
Thanks,

[giruchile]

20171220_125303.jpg

[Aliki]

Hi. giruchile, could you put the compiled firmware with the plugin PZET-004 ?

[papperone]

It seems the plugin of giruchile is a different one from the oen I uploaded to the GitHub; it would be great to keep just one plugin per device to avoid duplication and confusion...
I don't mind even to remove mine if the other is better but I'd like as I wrote to make sure users won't get confused with this...

[giruchile]

I actually copied codes from several sides until it worked. it is a very crude and imperfect programming.

I attach the code I use if someone wants to use it and better if they fix it, use it with espeasy 1.4 and mega espaesy.

_P099_PZEM.ino

Code: Select all

//#######################################################################################################
//#################################### Plugin 099: PZEM-004T ############################################
//#######################################################################################################

#define PLUGIN_099
#define PLUGIN_ID_099         99
#define PLUGIN_NAME_099       "PZEM-004T"
#define PLUGIN_VALUENAME1_099 ""


boolean Plugin_099(byte function, struct EventStruct *event, String& string)
{
  boolean success = false;

  switch (function)
  {

    case PLUGIN_DEVICE_ADD:
      {
        Device[++deviceCount].Number = PLUGIN_ID_099;
        Device[deviceCount].VType = SENSOR_TYPE_SINGLE;
        Device[deviceCount].ValueCount = 1;
        Device[deviceCount].SendDataOption = true;
        Device[deviceCount].TimerOption = true;
        Device[deviceCount].FormulaOption = true;
        break;
      }

    case PLUGIN_GET_DEVICENAME:
      {
        string = F(PLUGIN_NAME_099);
        break;
      }

    case PLUGIN_GET_DEVICEVALUENAMES:
      {
        strcpy_P(ExtraTaskSettings.TaskDeviceValueNames[0], PSTR(PLUGIN_VALUENAME1_099));
        break;
      }

    case PLUGIN_WEBFORM_LOAD:
      {
        byte choice = Settings.TaskDevicePluginConfig[event->TaskIndex][0];
        String options[4];
        options[0] = F("Voltaje");
        options[1] = F("Corriente");
        options[2] = F("Potencia");
        options[3] = F("Energia");
        int optionValues[4];
        optionValues[0] = 0;
        optionValues[1] = 1;
        optionValues[2] = 2;
        optionValues[3] = 3;
        string += F("<TR><TD>Indicator:<TD><select name='plugin_099'>");
        for (byte x = 0; x < 4; x++)
        {
          string += F("<option value='");
          string += optionValues[x];
          string += "'";
          if (choice == optionValues[x])
            string += F(" selected");
          string += ">";
          string += options[x];
          string += F("</option>");
        }
        string += F("</select>");

        success = true;
        break;
      }

    case PLUGIN_WEBFORM_SAVE:
      {
        String plugin1 = WebServer.arg("plugin_099");
        Settings.TaskDevicePluginConfig[event->TaskIndex][0] = plugin1.toInt();
        success = true;
        break;
      }
      
    case PLUGIN_READ:
      {
        float value = 0;
        float cont = 0;
        switch(Settings.TaskDevicePluginConfig[event->TaskIndex][0])
        {
          case 0: //Voltaje
          {
            value = pzem.voltage(ip);
            while(value < 0 ){
              cont++;
              if (cont == 3) {
                 return success;
              }
              value = pzem.voltage(ip); 
              String log = F("PZEM : ERROR LECTURA VOLTAJE");
              addLog(LOG_LEVEL_ERROR,log);
              }
            break;
          }
          case 1: //Corriente
          {
            value = pzem.current(ip);
            while(value < 0){
              cont++;
              if (cont == 3) {
                 return success;
              }
              value = pzem.current(ip); 
              String log = F("PZEM : ERROR LECTURA CORRIENTE");
              addLog(LOG_LEVEL_ERROR,log);
              }
            break;
          }
          case 2: //Potencia
          {
            value = pzem.power(ip);
            while(value < 0){
              cont++;
              if (cont == 3) {
                 return success;
              }
              value = pzem.power(ip); 
              String log = F("PZEM : ERROR LECTURA POWER");
              addLog(LOG_LEVEL_ERROR,log);
              }
            break;
          }
          case 3: //Energia
          {
            value = pzem.energy(ip);
            while(value < 0){
              cont++;
              if (cont == 3) {
                 return success;
              }
              value = pzem.energy(ip);
              String log = F("PZEM : ERROR LECTURA ENERGIA");
              addLog(LOG_LEVEL_ERROR,log); 
              }
            break;
          }
        }
     
        UserVar[event->BaseVarIndex] = value;
        String log = F("PZEM : ");
        log += value;
        addLog(LOG_LEVEL_INFO,log);
        success = true;
        break;
      }
  }
  return success;
}

in ESPEasy.ino add

Code: Select all

#include <PZEM004T.h>

I did not put all the values in the same device because I caused problems when integrating it in Domotics

[dcjona]

hello
no chance for me i tried but still 0...

i tried to plug to D5 and D6 on the wemos D& mini and also D3 and D4 but still the same ...
swap RX and TX done too

Voltage (V):233
Current (A): 0
Power (W): 0
Energy (Wh):45

any help please ?

[lolo]

Hola.

Estoy usando el sistema de aleph0, funcionando perfectamente, he conectado la alimentación de 5V. desde el ESP8266, en VIN y GND, en VIN hay 5V,

Hi.

I am using the aleph0 system, working perfectly, I have connected the 5V power. from ESP8266, in VIN and GND, in VIN there are 5V,

[aleph0]

hello
no chance for me i tried but still 0...

i tried to plug to D5 and D6 on the wemos D& mini and also D3 and D4 but still the same ...
swap RX and TX done too

Voltage (V):233
Current (A): 0
Power (W): 0
Energy (Wh):45

any help please ?

As you get voltage value, it means the module communicates with the ESP. But you don't get current, thus no power : Check your CT

[aleph0]

I am using the aleph0 system, working perfectly

Thanks

[goldriver]

Hi Alepho
I tried to compile using your directions below but I have error that I can't fgure out, could you help me with this please

First I would like to say that I am new to the ESP world and second I am new to compiling of firmware and ... english is not my primary language so please bare with me...

I'm trying to build a firmware that would include the PZEM004T plugin, I installed the Atom environment together with the PlateformIO and I have been able to build the vanilla ESPeasy bin file, not without issues (I had errors with the some IR that I removed from the build to fix) but I got it to build a firmware.

Then, I dowloaded the PZEM004T.io thast i added in the src directory and I also dowloaded the PZEM004.ZIP (containing the librairies, .h files etc) that I put in the lib directory and also download espsoftwareserial-3.2.3 in wich I modified the library.json as you mentionned and tried building a normal 4096 file and I got the following errors:

.pioenvs\normal_ESP8266_4096\lib298\libespsoftwareserial-3.2.3.a(SoftwareSerial.o): In function `sws_isr_0()':
SoftwareSerial.cpp:(.iram.text+0xd0): multiple definition of `sws_isr_0()'
.pioenvs\normal_ESP8266_4096\lib076\libSoftwareSerial.a(ESPeasySoftwareSerial.o):ESPeasySoftwareSerial.cpp:(.iram.
text+0xd4): first defined here

.pioenvs\normal_ESP8266_4096\lib298\libespsoftwareserial-3.2.3.a(SoftwareSerial.o): In function `sws_isr_1()':
SoftwareSerial.cpp:(.iram.text+0xe8): multiple definition of `sws_isr_1()'
.pioenvs\normal_ESP8266_4096\lib076\libSoftwareSerial.a(ESPeasySoftwareSerial.o):ESPeasySoftwareSerial.cpp:(.iram.
text+0xec): first defined here
.pioenvs\normal_ESP8266_4096\lib298\libespsoftwareserial-3.2.3.a(SoftwareSerial.o): In function `sws_isr_2()':
SoftwareSerial.cpp:(.iram.text+0x100): multiple definition of `sws_isr_2()'
.pioenvs\normal_ESP8266_4096\lib076\libSoftwareSerial.a(ESPeasySoftwareSerial.o):ESPeasySoftwareSerial.cpp:(.iram.
text+0x104): first defined here
collect2.exe: error: ld returned 1 exit status
*** [.pioenvs\normal_ESP8266_4096\firmware.elf] Error 1

thanks for any help

Hi, and thanks for making this nice plugin !

As I had to do some searching to finally compile and install it, here is a all-in-one summary of what needs to be done :
1/ Install and configure platform.io according to the instructions here :
https://www.letscontrolit.com/wiki/inde ... Platformio
then
https://www.letscontrolit.com/wiki/inde ... platformio

2/ Download the source tree from here :
https://github.com/letscontrolit/ESPEas ... .0.0-dev12 (or later version as there are being developed

3/ Download the plugin source from here and copy it in the main source
https://github.com/papperone/ESPEasyPlu ... M-004T.ino

4/ Download PZEM004T library from here and copy it in the lib subdirectory of the main source
https://github.com/olehs/PZEM004T

5/ Download SofwareSerial library in version 3.2.3 from here and copy it in the lib subdirectory of the main source
https://github.com/plerup/espsoftwarese ... /tag/3.2.3

6/ Update the library.json file that came from the softwareserial library with the following content :

Code: Select all

{
    "name": "EspSoftwareSerial",
    "version": "3.2.3",
    "keywords": [
      "serial", "io", "softwareserial"
    ],
    "description": "Implementation of the Arduino software serial for ESP8266.",
    "repository":
    {
        "type": "git",
        "url": "https://github.com/plerup/espsoftwareserial"
    },
    "frameworks": "arduino",
    "platforms": "espressif8266"
}

(version was missing and platforms mispelled )

After that, I was able to compile espeasy with the plugin and send it to the esp via OTA

[asking]

Hello aleph0, could you put the compiled firmware with the plugin PZET-004?

Please find attached the version for 4Gb flash with all the "Testing" plugins enabled, including the PZEM-004T with my last modifications to handle two modules. Use "port" to select the module : port 0 for first module and port 1 for second module. Remember each module will take up to 12s to answer in case there is no voltage on the main terminal, so don't poll faster then 15s*the number of modules

Feedback is welcome !

aleph0 thanks for wonderful work...

But i need to know more about polling. If main line voltage is available ? what's the update rate ? Every second ? can i ?

[asking]

I have uploaded .bin file to ESP8266 but its not showing any hotspot in wifi search of my laptop.. have anyone tried this Flash ?

[aleph0]

@asking

When everything goes well, one module answer within 1s. But if you poll faster than 12s/module, your espeasy will crash in case of no measurment voltage.
And, of course I tested the bin file, I uploaded the one I'm using here, it's been up for 50 days now and doing the job fine

[asking]

@asking

When everything goes well, one module answer within 1s. But if you poll faster than 12s/module, your espeasy will crash in case of no measurment voltage.
And, of course I tested the bin file, I uploaded the one I'm using here, it's been up for 50 days now and doing the job fine

What's your update rate you're testing?
Because if i poll faster than 5 seconds update frequency is not periodic and updates randomely.

Anyways its working great...i am looking for 1 second update rate if possible

[aleph0]

Yes, it's not that surprising : once in a while a value is not coming, triggering the timeout (1s each) and the retry (3 times). It's been reported the quality of 5v supply have an influence on this.

If you want to be able to poll faster, you need to edit the source code to shorten the timeout and no retry. In that case I advise you keep the error value transmitted (-1) and to manage reading errors in the host instead of in esp

[asking]

Okay will try that, thanks for suggesting.

[nicofly974]

Hello,

I'm new in esp easy,
I've a pzem004 with wemos mini pro and domoticz
I've put P171 of playground
I've tension and current in panel control of my ESP, but 0 for Power and Energy

espc.JPG

consolepzem.JPG

Second problem, in domoticz I've icon pzem with: 0;232,1;0,23;0;0 icon Voltage 232,1 but nothing in the others icons

domo.JPG

If you have an idear
Great thanks for this plugin

[dcjona]

hello
no chance for me i tried but still 0...

i tried to plug to D5 and D6 on the wemos D& mini and also D3 and D4 but still the same ...
swap RX and TX done too

Voltage (V):233
Current (A): 0
Power (W): 0
Energy (Wh):45

any help please ?

As you get voltage value, it means the module communicates with the ESP. But you don't get current, thus no power : Check your CT

hi, yes i have 233 in voltage but nothing else

[TD-er]

[...]

hi, yes i have 233 in voltage but nothing else

Can you draw a schematic on how your module is connected?
The current is measured over a shunt resistor, but if no current passes through this shunt, nothing will be measured.

[nicofly974]

I've a current charge, in icon pezm1 I've 0.24A
but nothing in Energie and Power

Some idear?

[dcjona]

off course :
just like this but gnd and vcc on the wemos d1 mini
i tried D5-D6 and TX-RX -> same issue

[zacaruca1]

Para los que teneis errores en la lectura, debeis modificar en la libreria espsoftwareserial-3.2.3 , el fichero SoftwareSerial.cpp la siguiente linea:

Code: Select all

 unsigned long wait = m_bitTime + m_bitTime/3 - 500;

por esta otra:

Code: Select all

 unsigned long wait = m_bitTime + m_bitTime/2 - 500;

For those who have errors in reading, you must modify in the library espsoftwareserial-3.2.3, the SoftwareSerial.cpp file the following line:

Code: Select all

unsigned long wait = m_bitTime + m_bitTime / 3 - 500;

for this other:

Code: Select all

unsigned long wait = m_bitTime + m_bitTime / 2 - 500;

[Raspi_0x00]

Hi,

Please forgive me but I'm new.

I have ESP12 and PZEM004 that I successfully used for one year sending data to ThingSpeak.
Now I have Demoticz system + ESPEasy. And I woudl like to add this energy meter to my system.
I downloaded bin file from:

download/file.php?id=1760

and uploaded to my ESP12.
Everything is OK beside reading of energy meter values, all are -1.
I think everything is OK from HW side but as I can see I have problem with correct settings of RX, TX lines in ESPeasy SW.
According to the doc I should use GPIO1 and GPIO3. But these lines are inactive in ESPeasy SW.

Could you help me in this case?

[Raspi_0x00]

Could you help me in this case?

[Raspi_0x00]

Hi,

Problem solved. Works grate!!! The problem was that my PCB was configured for use UART0 (GPIO1..3).
When I changed do 13-15 everything is OK.
But I wonder why the Voltage measurement is such unstalble ( I get -1 in most readings).
Any ideas? Update rate is 1min

[drfranky]

Hello from yesterday I trying to configure PZEM 004 with ESP.
Everything is fine but some of the values are not correct. I mean the power is incorrect.
As you can see from screenshot ESP shows power 22W but should be 236.4 V * 0.18A = 42.55 W.


Can you tell me please how I can solve this issue?
I tried with formulas but without success.

Regards

[papperone]

Hello from yesterday I trying to configure PZEM 004 with ESP.
Everything is fine but some of the values are not correct. I mean the power is incorrect.
As you can see from screenshot ESP shows power 22W but should be 236.4 V * 0.18A = 42.55 W.


Can you tell me please how I can solve this issue?
I tried with formulas but without success.

Regards

With this module the ESPEasy plugin does nothing but fetching the numbers from the module and use them as they are.
There's no calculation beside the ones done by the PZEM-004T itselft, so i can only guess the module you have does not work properly...

[TD-er]

Hello from yesterday I trying to configure PZEM 004 with ESP.
Everything is fine but some of the values are not correct. I mean the power is incorrect.
As you can see from screenshot ESP shows power 22W but should be 236.4 V * 0.18A = 42.55 W.


Can you tell me please how I can solve this issue?
I tried with formulas but without success.

Regards

With this module the ESPEasy plugin does nothing but fetching the numbers from the module and use them as they are.
There's no calculation beside the ones done by the PZEM-004T itselft, so i can only guess the module you have does not work properly...

I'm not (yet) familiar with the module. But is it possible the power in Watt is correct and also the current and voltage, but that there is some cos-phi acting up here?
What kind of load is connected to the sensor? Something with a true resistive load, like a heating element or something with an inductive load like an elektro motor or some switching power supply?

[drfranky]

Hello from yesterday I trying to configure PZEM 004 with ESP.
Everything is fine but some of the values are not correct. I mean the power is incorrect.
As you can see from screenshot ESP shows power 22W but should be 236.4 V * 0.18A = 42.55 W.


Can you tell me please how I can solve this issue?
I tried with formulas but without success.

Regards

With this module the ESPEasy plugin does nothing but fetching the numbers from the module and use them as they are.
There's no calculation beside the ones done by the PZEM-004T itselft, so i can only guess the module you have does not work properly...

I'm not (yet) familiar with the module. But is it possible the power in Watt is correct and also the current and voltage, but that there is some cos-phi acting up here?
What kind of load is connected to the sensor? Something with a true resistive load, like a heating element or something with an inductive load like an elektro motor or some switching power supply?

Hi,

The load is power supply for my laptop. There is no cos-phi variable.
I tried to fix this with formulas in Easyesp but I don't know what is the variable for Voltage and Current in the fields.

Regards

[papperone]

All the calculations are performed by the module itself, the plugin is simply reading data trough softserial and update the device variables.
As in my 2 modules the data are reported correcly (as in some of the screenshot I posted previously) and not knowing any calibration is possible with those devices, I see as only diagnosys that this module is faulty....

[TD-er]

The cos phi is the phase shift between voltage and current.
So it is perfectly acceptable when the power in Watt is lower than the power in VA. It simply mean the cos phi is not 1 and thus there is a phase shift.

A switching power supply without power factor correction (essentially eliminating cos phi phase shift) usually has a cos phi of about 0.6, which means that a power of 100 VA results in 0.6*100 = 60 Watt.

Please try the measurement with something with a resistive load, like an oldfashioned glowing light bulb or a heating element and you'll see the power in Watt equals voltage * current.
For inductive loads (that result in a phase shift of current) the cos phi will be less than 1 and thus the power in Watt is lower than V * A.

With a cos phi of 1, the sinus of Voltage and the sinus of current are perfectly in sync. That means the current is 0 when voltage is 0 and max when voltage is max.
With inductive loads, the sinus of the current will shift a little, meaning the peak of the current is not at the moment of the voltage peak.
And with switching power supplies the curve of the current is not even a sinus anymore and its peak is very unlikely to be at the peak of the voltage.

In short:
V * A = VA
V * A * cos phi = Watt.

On electric motors, you often see a cos phi mentioned.

[DaveS]

Hi All,
Have flashed a wemos D1 mini and a nodemcu module with the firmware build posted on this thread (ESPEasy-2.0.0-dev12_test_4096.bin.zip) with the same results.
All options can be configured with no issues until selecting the PZEM004 as a device and configuring GPIO's and pressing submit radio button the device becomes unresponsive,no reply to ping after this.
A reboot will show all -1 values under devices,pages are very slow to open in browser.
Have powered ESP8266 from PC's USB port as well as a mobile phone charger so do not think 5 volt power is a problem.
PZEM module works perfectly when tested on an arduino and on ESP8266 using enode firmware file after doing R17 resistor mod for 3v3 operation.
Is there a fix for this or a later build of ESPeasy that supports the PZEM-004 module ?
Thanks
Dave

[maluko]

hi

look at this acessorio to pzem 004t

http://www.movimentomaker.pt/t/bh-pzem- ... -wi-fi/234

[DaveS]

Thank you maluko.
Will compile this and test it.
Only need MQTT functionality !

[dio45rus]

hello
no chance for me i tried but still 0...

i tried to plug to D5 and D6 on the wemos D& mini and also D3 and D4 but still the same ...
swap RX and TX done too

Voltage (V):233
Current (A): 0
Power (W): 0
Energy (Wh):45

any help please ?

I suspect that you pull all wires of the cable throught current transformer, but need only one of them.

[Sabado]

Hello, i am completely new and lost too.
I try to link a Pezm-004t with a wemos D1 R2 board.
my goals are monitoring my energy consumption, diverting the current i don't use at any moment, with some opto couplers relays, and data-log the currrent from my solar panels.
at the very moment :
i link the Pzem-004t to a source with a load. i have 235 volts on the curent input, and the coil on pin 3 4.
RX,Tx from Pzem are connected to TX,RX on Wemos D1R2 pin 8 9.ground to GND, and 5V (Pzem) to 5V (Wemos).

Running the PzemDisplay example(modified with PZEM004T pzem(8 ,9); // (RX,TX) connect to TX,RX of PZEM)
i have allways -1.00V , with RX,TX connected or not.
at this time, i have no idea about what i may try to have results.
Please, do you have any idea?
Best regards

[Raspi_0x00]

I wonder how can I use 3 phase measurements.
The best would be to use one ESP module and use address of 3 PZEM modules. But fist thing is to set address to each module for each phase.
As I can see Espeasy FW dosn't support using of 3 modules or using of different address. Do you have any idea how can we find solutuion for 3 phase measurements?

[aleph0]

Yes... but I stopped at 2 modules because I didn't like the solution I programmed... I need to work again on this subject

[Raspi_0x00]

When do you think, you finish new version of FW to handle 3 PZEM modules?