Problem PZEM-004T Version 3.0

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19

Well, this won’t work!
The D1 Mini/pro has one and a half UARTS.
UART0 is connected to he USB socket and also to pins Tx and Rx. And is used for programming the device.
UART1 is Tx only and is connected to pin D4.

If you need to have Tx/Rx communications with a peripheral such as the PZEM then you’ll need to use UART0. If you also want to use a serial monitor to see debug output then you could connect an FTDI to D4.

Pete.

1 Like
20

WEMOS D1 mini TX is GPIO1
&
WEMOS D1 mini RX is GPIO3

I suggest to use Tasmota to check if your Board is OK (easiest solution)
or
use NodeMCU V3

Code : Is HERE

1 Like
21

Ok I’ll try and let you know what happens, thanks Mille for technical support.

22

Ok I’ll try and let you know what happens, thanks Mille for technical support :wink::wink::wink:

23

Hello !
According to the specifications given for v.3.0 of PZEM-004T it measures/reports also the frequency and the power factor. I’m not sure if the library https://github.com/olehs/PZEM004T is able to read these new electricity parameters.
Did you run any test how to read those parameters apart voltage,current, power and energy ?
Thanks !

24

With Tasmota you just connect your PZEM-004T to your ESP “serial” and here is what you get

Screenshot_20190610-223319.png1440×2560
Screenshot_20190610-223411.png1440×2560

25

Try this worked for me…

migas2
migas2.jpg2666×952 886 KB

4 Likes
26

Или может это поможет

2 Likes
27

Hi Ze_Pico,
I just flashed the Wesmo mini with Tasmota and configured as shown below.

When connect:

  • D8 on Wesmo connected to Rx on PZEM
  • D7 on Wesmo connected to Tx on PZEM
    ==> Wesmo has no response, I can’t get into the Wesmo web interface.

I also tried to replace the Wesmo with NodMCU v3 and flashed it with Tasmota but the reading still show zero.
Here is the setup for NodeMCU v3:

Would you please let me know what did I do wrong and how to fix it so the reading on show up on the Tasmota?

28
    1. Be sure you are using the latest version of Tasmota with Arduino IDE or PlatformIO.
      GitHub version
      the Development version
      Dev Version
    1. Before compiling check your
      " my_user_config.h "
      to see if PZEM section is not commented as in the picture below

pzem
pzem.png946×290 116 KB

    1. for PZEM_AC v3 set Tasmota to “PZEM016 Rx (98)”
29

@key
If after all this you still have no readings perhaps your unit is defective or damage !

30

Hi Ze_Pico,
Since I’m new to Tasmota, I think I missed some steps here. All I did is just flash the Wesmo/NodMCU with Tasmota firmware, I haven’t do and sketch upload or modify the config.h file yet.

Could you please let me know where can I download those for PZEM-004T v3 sketch like the one on your posted?

What is the the correct pin connection between Wesmos/NodMCU and PZEM-004T v3?

Regards,
Key

31

I know @PeteKnight suggested it already to you, so…Why don’t you try with simple USB<–>serial (TTL) bridge, like FT232 (or many other) connected to PC,using official PZEM software (or ANY terminal) and verify if your unit is OK or not…

1 Like
32

@key
OK, we will do it step by step.
can you show me your configuration page especially the last line to know the version you are using.
like Here

33

Ok ok

34

I will carry out the steps you described with the FW Tasmota in order to try if everything works. You have been very kind, as soon as all this is done you will update on the process and the operation. Thank you very much for the help you are giving us.

35

Hi Ze_Pico,

Here is the steps that I did on Wesmo D1 Mini and PZEM-004 v3 (Just to make sure, I get another set of brand new Wesmo and PZEM)

1- Flash Wesmo with Tasmota v6.5 sonoff.bin (download from HERE)
2- Access Wesmo Sonoff page and configure it like this:

Wesmo1
Wesmo1.JPG458×723 33 KB
Wesmo2
Wesmo2.JPG291×720 37.5 KB

Note: On the new Sonoff 6.5, I don’t see any page on Sonoff that display voltage.

3- Connect Wesmo 5V to PZEM 5V
4- Connect Wesmo G to PZEM GND
5- Connect Wesmo D7 to PZEM Tx
6- Connect Wesmo D8 to PZEM Rx

As soon as I connect all the wires like above, I get no response to the Wemos
Wesmo3

Remove D7 & D8 then I get the response
Wesmo4

Please let me know what is the next steps that I need to do?

36

first your Tasmota version is 6.5.0 and that is OK.
Next step why you are using Configure Template you should use Configure Module.
can you adjust your configure module to this picture.

pzem%20tx%20rx
pzem tx rx.png355×554 56.8 KB

and tell me what you see in Main Menu
don’t forget to save your configuration.

37

GPIO 4 и GPIO 5 это D1 и D2 !!! Причем тут D7 и D8 ??? Либо провода перекинь или GPIO 13-15 выставь

38

@svs2007m
not every body can translate Russian to English or have a translator within his browser.
if you can do it for us it will facilitate our discussion.
thanks.