Exploring the Features and Specifications of Tuya WiFi Energy Meter PJ-1103a [BK7231N][CB2S]

Question

Energy meter ordered from Aliexpress [line:9f41ac83ff] Specifications: Name: Tuya WiFi Energy Meter Material: PC Type: 1CT, 2CT (optional) Current: 0.2-80A Input voltage: 110-240 V, 50/60Hz Accuracy grade: 1.0 Working current: -10℃ to 55℃ Wireless type: 2.4GHz Item size: 47 * 47 * 18mm / 1.85 *...

p.kaczmarek2 · Answer

Thanks for the info. I will only that it may be possible to get quicker updates from this meter by using:


tuyaMcu_sendQueryState

in a repeating event or in a loop. See our docs for more details:
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/docs/README.md

taktlos · Answer

Thank you for the hint, but sadly the command:Code: DosLog in, to see the codeor with a 5-second interval gives the same quantity (or pretty much the same) of dpIDs readouts in the output.

p.kaczmarek2 · Answer

That's strange... I seem to remember playing with a very similiar device and it seemed to work on my side: Hm mine was PJ-MGW1103 meter with CT CB2S...

rohanb · Answer

Hi

I have one of these same units PJ-1103A and have set it up using the supplied config and what is found in other forums.
Below is what the GUI looks like

and Below is my config


[startDriver TuyaMCU
tuyaMcu_setBaudRate 9600
tuyaMcu_defWiFiState 4

startDriver NTP
ntp_setServer 129.250.35.251
ntp_timeZoneOfs +10

//voltage
setChannelType 2 Voltage_div10
SetChannelLabel 2 " Voltage "
linkTuyaMCUOutputToChannel  112 val 2

//current A
setChannelType 3 Current_div1000
SetChannelLabel 3 " Current(A) "
linkTuyaMCUOutputToChannel 113 val 3

//current B
setChannelType 4 Current_div1000
SetChannelLabel 4 " Current(B) "
linkTuyaMCUOutputToChannel 114 val 4

//frequency
//calibration is 1017
setChannelType 5 Frequency_div100
SetChannelLabel 5 " Frequency "
linkTuyaMCUOutputToChannel  111 val 5 

//power A
setChannelType 6 Power_div10
SetChannelLabel 6 " Power(A) "
linkTuyaMCUOutputToChannel  101 val 6 

//power B
setChannelType 7 Power_div10
SetChannelLabel 7 " Power(B) "
linkTuyaMCUOutputToChannel  105 val 7 

//power factor A
setChannelType 8 PowerFactor_div100
SetChannelLabel 8 " Power factor(A) "
linkTuyaMCUOutputToChannel  110 val 8

//power factor B
setChannelType 9 PowerFactor_div100
SetChannelLabel 9 " Power factor(B) "
linkTuyaMCUOutputToChannel  121 val 9 

//forward energy A
setChannelType 10 EnergyTotal_kWh_div100
SetChannelLabel 10 " Forward energy(A) "
linkTuyaMCUOutputToChannel  106 val 10

//forward energy B
setChannelType 11 EnergyTotal_kWh_div100
SetChannelLabel 11 " Forward energy(B) "
linkTuyaMCUOutputToChannel  108 val 11 

//Total Power W
setChannelType 12 Power_div10
SetChannelLabel 12 " Total Power (W) "
linkTuyaMCUOutputToChannel  115 val 12

//reverse energy A
setChannelType 13 EnergyTotal_kWh_div100
SetChannelLabel 13 " Reverse energy(A) "
linkTuyaMCUOutputToChannel  107 val 13

//reverse energy B
setChannelType 14 EnergyTotal_kWh_div100
SetChannelLabel 14 " Reverse energy(B) "
linkTuyaMCUOutputToChannel  109 val 14 

//Total energy forward
setChannelType 15 EnergyTotal_kWh_div100
SetChannelLabel 15 " Total Forward Energy "
linkTuyaMCUOutputToChannel  1 val 15

//Total energy reverse
setChannelType 16 EnergyTotal_kWh_div100
SetChannelLabel 16 " Total Reverse Energy "
linkTuyaMCUOutputToChannel  2 val 16

//Direction A
setChannelType 17 ReadOnly
SetChannelLabel 17 " Direction(A) "
linkTuyaMCUOutputToChannel  102 bool 17

//Direction B
setChannelType 18 ReadOnly
SetChannelLabel 18 " Direction(B) "
linkTuyaMCUOutputToChannel  104 bool 18

setChannelType 19 ReadOnly
linkTuyaMCUOutputToChannel  102 bool 19
alias positive SetChannelLabel 19 " Direction(A)  - Forward/Consuming "
alias negative SetChannelLabel 19 " Direction(A)  - Reverse/Exporting "
alias myset if $CH19==0 then positive else negative
addEventHandler OnChannelChange 19 myset 


setChannelType 20 ReadOnly
linkTuyaMCUOutputToChannel  104 bool 20
alias positive1 SetChannelLabel 20 " Direction(B)  - Forward/Consuming "
alias negative1 SetChannelLabel 20 " Direction(B)  - Reverse/Exporting "
alias myset1 if $CH20==0 then positive1 else negative1
addEventHandler OnChannelChange 20 myset1 

//reporting rate
setChannelType 22 ReadOnly
SetChannelPrivate 22 true
SetChannelLabel 22 "Reporting rate"
linkTuyaMCUOutputToChannel  129 val 22
SetChannel 22 5


//voltage calibration
//990 is config for this 
setChannelType 23 ReadOnly
SetChannelPrivate 23 true
SetChannelLabel 23 "Voltage calibration"
linkTuyaMCUOutputToChannel  116 val 23
SetChannel 23 992

//power A calibration
//1070 is config for this 
setChannelType 24 ReadOnly
SetChannelPrivate 24 true
SetChannelLabel 24 "Power(A) calibration"
linkTuyaMCUOutputToChannel  118 val 24
SetChannel 24 1075

//current B calibration
setChannelType 28 TextField
setChannelType 28 ReadOnly
SetChannelPrivate 28 true
SetChannelLabel 28 "Current(B) calibration"
linkTuyaMCUOutputToChannel  123 val 28
SetChannel 28 1030

//power B calibration
setChannelType 29 ReadOnly
SetChannelPrivate 29 true
SetChannelLabel 29 "Power(B) calibration"
linkTuyaMCUOutputToChannel 124 val 29
SetChannel 29 1070

//current A calibration
setChannelType 25 ReadOnly
SetChannelPrivate 25 true
SetChannelLabel 25 "Current(A) calibration"
linkTuyaMCUOutputToChannel  117 val 25
SetChannel 25 1030

addRepeatingEvent 5 -1 myset1 
addRepeatingEvent 5 -1 myset 
addRepeatingEvent 5 -1 tuyaMcu_sendQueryState
PowerSave 1

The energy stats seem either not to work or to be wildly inaccurate and some of them are lost of you power cycle the unit.

My 2 questions to @p.kaczmarek2 are

1/ Can we get energy stats to work like the BL0492 driver rather than this way
2/ How can I use Enums for channel 19 and 20 rather than rewriting just the channel labels

Thanks in advance.

p.kaczmarek2 · Answer

It should be possible to link old BL0942 energy stats to TuyaMCU, but TuyaMCU may not provide frequent enough updates for it to work good. It is currently not implemented.

dpIDs 20 and 19 are current direction? We can create channel type for that.

rohanb · Answer

>>21164859
Thanks but this is not a BL0942 it's a HLW8112
I am unsure but maybe we can bypass Tuya MCU and connect straight to CB2S but this would require a driver and from what I can find there is not a lot of data around for it.
(Data sheet attached)

Maybe I just purchase a new unit that's based on the BL0942 chips ??

DPid 102 and 104 are the clamp A and B directions .

Thanks again

p.kaczmarek2 · Answer

You could bypass TuyaMCU and connect HLW8112 to BK7231 but, as you said, it would require writing a driver. You could just try to port existing BL0942 driver, as the packets may be similiar, be we would need to analyze the datasheet more.

My PJ-MGW1103 , on the other hand, was using BL0942. No strange chips there. BL0942, TuyaMCU and BK7231. Here are details:
https://www.elektroda.com/rtvforum/topic4053493.html

dicamarques · Answer

I just got a power meter, similar to this one, but the interior is just the CBU and the HLW8112 . So I think we can assume mine is a direct connection?

p.kaczmarek2 · Answer

Most likely, yes, it may be a version without TuyaMCU. You can also check the flash dump. By the way, why do you charge 1 point for downloading your binary file? Usually points are used when you are posting something helpful for other users, and not requesting for help yourself Still, flash this device with OBK and give it a go. We'll try to help

dicamarques · Answer

>>21212834 Ah so that's what that's for😅 sorry my mistake, I just disabled thatI'm slowly converting my tuya devices

p.kaczmarek2 · Answer

Ok, I haven't found much in that binary backup, so I'd say just flash OBK and we will see. In worst case you can always restore factory firmware.

The another question is how the HLW8112 protocol looks like. It may be not supported yet. Is it using UART or SPI?

Maybe it would be helpful to check and sketch the connections of HLW8112 pins to the WiFi module?

dicamarques · Answer

>>21212842 I'm trying to make a diagram, but from the datasheet of the HLW8112, the PIN SPIEN is High, so I'm assuming its SPI

divadiow · Answer

>>21212779 interesting all this is in that bin Code: JSONLog in, to see the code the boot log is equally as interesting Code: TextLog in, to see the code

dicamarques · Answer

>>21213563 I should add that I did this dump before I configured the device with the smartlife appHere's the pinout I managed to find

p.kaczmarek2 · Answer

Hmm, we have BL0942 SPI mode supported, how is HLW SPI different from that?

dicamarques · Answer

>>21214642 Well I haven't really compared both datasheets, but the hlw has 2 channels so it might have differences .pdf

dicamarques · Answer

I'm going to try and work on a driver for it, I'm already making a note of all the registers from the registry table

p.kaczmarek2 · Answer

Very good, let me know if you need any specific guidance, I will do my best to help. Keep it on!

exotsk · Answer

Very popular model, I currently have two of them. I flashed one before I realized that there are no drivers for this type of energy monitor chip. CBU/HLW8112.
Flashing is very easy and convenient. I'm waiting for an update to use this with OpenBekken. I made a dump; if you need any data, I can provide it.

davidjaka · Answer

Same situation here. Waiting for a working OpenBeken firmware for the device. Flashed it back to the Tuya firmware, but now it's incorrectly showing power.

dicamarques · Answer

The code I have on my repo has an initial communication with the chip, but I still hadn't had time to implement all the features and see if it's really working

davidjaka · Answer

Maybe I can help with some testing? It would be great to have working firmware for this device because it is easy to flash and looks like it’s popular on Aliexpress.

jacquesjacobus · Answer

Got the same model here also. Has anyone made any progress?

nhsqr · Answer

I have compiled your repo branch: drv_hlw8112I can see that the driver is compiling successfully but after flashing it does not show up in module configuration drop down menu (on both web and app).Am I missing something?This is an interesting project that I think I can help with in the next few weeks.Also I have found a very well written driver in a Chinese repo: the development of this driver was: Added after 2 [minutes]:Mine is exactly the same as

dicamarques · Answer

>>21333707
I think you first need to send the command startDriver HLW8112SPI if i'm not mistaken

I was looking at that babyOs, maybe we can have a look at this file https://github.com/notrynohigh/BabyOS/blob/master/bos/drivers/b_drv_hlw811x.c
I haven't had the time to continue debugging my development but maybe this can speed up the process

Or maybe: https://github.com/MahdaSystem/HLW811x/blob/master/src/HLW811x.c its easier

nhsqr · Answer

Yes, you are right about the command. I took a look at the code and saw it. Unfortunately it gets me: Code: text Expand Select all Copy to clipboardWarn:EnergyMeter:HLW8112_SPI_Init Error:EnergyMeter:Failed to write reg 80 val A04: read 410000 Error:EnergyMeter:Failed to write reg 81 val 00: read 60000 Warn:EnergyMeter:HLW8112_SPI_Init_OUT Info:MAIN:Started HLW8112SPI. So now I am not sure if the HLW8112 chip is not working properly or is there something wrong in the code because before I flushed it, the original firmware was freezing for some unknown reason. And now I am thinking of buying another one but it will take at least a couple of weeks to arrive.

laszlokondas · Answer

Hello all! I'm using this meter with, using the TuyaMCU driver with the configuration from @rohanb. I can also confirm that the instant measurements are OK, but from the historical ones only the energyTotal is reliable.

I did not use calibration values in the config, and my sensor measurements are off by 5% approx. Is there a way I can access the calibration values from the original firmware? Unfortunately I did not make a dump before flashing openBeken...

alexan_e · Answer

>>21337073

Hi, I've made this one and I can access all the configuration settings and change them.

autoexec.bat for PJ-1103A dual clamp energy meter (Tuya)


startDriver TuyaMCU
tuyaMcu_setBaudRate 9600
tuyaMcu_defWiFiState 4

startDriver NTP
ntp_setServer 129.250.35.251

// set for your timezone
ntp_timeZoneOfs +2

setChannelType 2  EnergyTotal_kWh_div100
setChannelType 3  EnergyTotal_kWh_div100
setChannelType 4  Power_div10
setChannelType 5  ReadOnly
setChannelType 6  ReadOnly
setChannelType 7  Power_div10
setChannelType 8  EnergyTotal_kWh_div100
setChannelType 9  EnergyTotal_kWh_div100
setChannelType 10 EnergyTotal_kWh_div100
setChannelType 11 EnergyTotal_kWh_div100
setChannelType 12 PowerFactor_div100
setChannelType 13 Frequency_div100
setChannelType 14 Voltage_div10
setChannelType 15 Current_div1000
setChannelType 16 Current_div1000
setChannelType 17 Power_div10
setChannelType 18 PowerFactor_div100
setChannelType 19 TextField
setChannelType 20 TextField
setChannelType 21 TextField
setChannelType 22 TextField
setChannelType 23 TextField
setChannelType 24 TextField
setChannelType 25 TextField
setChannelType 26 TextField
setChannelType 27 TextField
setChannelType 28 TextField
setChannelType 29 TextField

SetChannelLabel  2   "Total Forward energy"
SetChannelLabel  3   "Total Reverse energy"
SetChannelLabel  4   "Power A"
SetChannelLabel  5   "Direction A (0=forward - 1=reverse)"
SetChannelLabel  6   "Direction B (0=forward - 1=reverse)"
SetChannelLabel  7   "Power B"
SetChannelLabel  8   "Forward Energy A"
SetChannelLabel  9   "Reverse Energy A"
SetChannelLabel  10  "Forward Energy B"
SetChannelLabel  11  "Reverse Energy B"
SetChannelLabel  12  "Power Factor A"
SetChannelLabel  13  "AC Frequency"
SetChannelLabel  14  "Voltage"
SetChannelLabel  15  "Current A"
SetChannelLabel  16  "Current B"
SetChannelLabel  17  "Total Power"
SetChannelLabel  18  "Power Factor B"
SetChannelLabel  19  "Voltage Calibration (800-1200)"
SetChannelLabel  20  "Current A Calibration (800-1200)"
SetChannelLabel  21  "Power A Calibration (800-1200)"
SetChannelLabel  22  "Energy A Calibration Forward (800-1200)"
SetChannelLabel  23  "Frequency Calibration (800-1200)"
SetChannelLabel  24  "Current B Calibration (800-1200)"
SetChannelLabel  25  "Power B Calibration (800-1200)"
SetChannelLabel  26  "Energy B Calibration Forward (800-1200)"
SetChannelLabel  27  "Energy A Calibration Reverse (800-1200)"
SetChannelLabel  28  "Energy B Calibration Reverse (800-1200)"
SetChannelLabel  29  "Adjust Reporting Rate (3-60)"

linkTuyaMCUOutputToChannel 1   1 2 
linkTuyaMCUOutputToChannel 2   1 3 
linkTuyaMCUOutputToChannel 101 2 4 
linkTuyaMCUOutputToChannel 102 2 5 
linkTuyaMCUOutputToChannel 104 1 6 
linkTuyaMCUOutputToChannel 105 1 7 
linkTuyaMCUOutputToChannel 106 1 8 
linkTuyaMCUOutputToChannel 107 1 9 
linkTuyaMCUOutputToChannel 108 1 10
linkTuyaMCUOutputToChannel 109 1 11
linkTuyaMCUOutputToChannel 110 1 12
linkTuyaMCUOutputToChannel 111 1 13
linkTuyaMCUOutputToChannel 112 1 14
linkTuyaMCUOutputToChannel 113 1 15
linkTuyaMCUOutputToChannel 114 1 16
linkTuyaMCUOutputToChannel 115 1 17
linkTuyaMCUOutputToChannel 121 1 18
linkTuyaMCUOutputToChannel 116 2 19
linkTuyaMCUOutputToChannel 117 2 20
linkTuyaMCUOutputToChannel 118 2 21
linkTuyaMCUOutputToChannel 119 2 22
linkTuyaMCUOutputToChannel 122 2 23
linkTuyaMCUOutputToChannel 123 2 24
linkTuyaMCUOutputToChannel 124 2 25
linkTuyaMCUOutputToChannel 125 2 26
linkTuyaMCUOutputToChannel 127 2 27
linkTuyaMCUOutputToChannel 128 2 28
linkTuyaMCUOutputToChannel 129 2 29

// do not send to MQTT the following channels
SetChannelPrivate 19 true
SetChannelPrivate 20 true
SetChannelPrivate 21 true
SetChannelPrivate 22 true
SetChannelPrivate 23 true
SetChannelPrivate 24 true
SetChannelPrivate 25 true
SetChannelPrivate 26 true
SetChannelPrivate 27 true
SetChannelPrivate 28 true
SetChannelPrivate 29 true

// you can use these to force initial calibration values 
//SetChannel 19 1000
//SetChannel 20 1000
//SetChannel 21 1000
//SetChannel 22 1000
//SetChannel 23 1000
//SetChannel 24 1000
//SetChannel 25 1000
//SetChannel 26 1000
//SetChannel 27 1000
//SetChannel 28 1000
//SetChannel 29 10

PowerSave 1

It's based on this table which can be found image source

exotsk · Answer

>>21373100 this solution not usable for hlw811 model?

Exploring the Features and Specifications of Tuya WiFi Energy Meter PJ-1103a [BK7231N][CB2S]

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