Flashing PJ 1103C Smart Meter (BK7238 V1.2) with BK7231 GUIFLASHTool and TuyaMCU Setup

Smart meter PJ 1103C BK7238 V1.2 (2025/8/13)

How to make it works.
Take off the wifi bk7238
Flash with BK7231 GUIFLASHTool (V154)
3.3V, gnd, tx rx
Put back the wifi card,
Connect to 240V
Once in the html page go to startup command and paste this:

Start:
startDriver TuyaMCU
tuyaMcu_setBaudRate 9600
tuyaMcu_defWiFiState 4
addRepeatingEvent 10 -1 uartSendHex 55AA0008000007
setChannelType 1 Voltage_div10
setChannelType 2 Frequency_div100
setChannelType 3 Power_div10
setChannelType 4 Current_div1000
setChannelType 5 PowerFactor_div100
setChannelType 6 EnergyTotal_kWh_div100
setChannelType 7 Power_div10
setChannelType 8 Current_div1000
setChannelType 9 PowerFactor_div100
setChannelType 10 EnergyTotal_kWh_div100
setChannelType 11 ReadOnly
setChannelType 12 ReadOnly
setChannelType 13 Power_div10
linkTuyaMCUOutputToChannel 112 val 1
linkTuyaMCUOutputToChannel 111 val 2
linkTuyaMCUOutputToChannel 101 val 3
linkTuyaMCUOutputToChannel 113 val 4
linkTuyaMCUOutputToChannel 110 val 5
linkTuyaMCUOutputToChannel 106 val 6
linkTuyaMCUOutputToChannel 105 val 7
linkTuyaMCUOutputToChannel 114 val 8
linkTuyaMCUOutputToChannel 121 val 9
linkTuyaMCUOutputToChannel 107 val 10
linkTuyaMCUOutputToChannel 102 raw 11
linkTuyaMCUOutputToChannel 104 raw 12
linkTuyaMCUOutputToChannel 115 val 13
setChannelLabel 1 "Tension"
setChannelLabel 2 "Frequence"
setChannelLabel 3 "Puissance A"
setChannelLabel 4 "Courant A"
setChannelLabel 5 "PowerFactor A"
setChannelLabel 6 "Energie A"
setChannelLabel 7 "Puissance B"
setChannelLabel 8 "Courant B"
setChannelLabel 9 "PowerFactor B"
setChannelLabel 10 "Energie B"
setChannelLabel 11 "Direction A"
setChannelLabel 12 "Direction B"
setChannelLabel 13 "Puissance nette"

Then it should work.
PS: If you have more than one to flash, you might be annoyed with the same mac adress.
So in the UART Flasher go to: show advanced options and hit the restore RF part. this should assign an differetn mac adress that can be read by hitting the firmware backup (read) only, at the end it will show the new mac adress





AI: What exactly is not working after following these steps? Are you getting any errors, or is the device not responding as expected?
nope
AI: Which firmware or binary file did you use with the BK7231 GUIFLASHTool to flash the smart meter?
openBK7238_QIO_1.18.226.bin

there seem to be a few variations of this device.

eg
https://www.elektroda.com/rtvforum/topic3946128.html
https://www.elektroda.com/rtvforum/topic4053493.html

How are these two chips labelled?



and what's on this riser board?

>>21783661
Yes I bought them few days ago, firmware from 2025/8/13.
those ones have PJ-1103C not A but come with the HLW8112 and the N32G430. I put the pic for the power switch.
Hope it'll help. If more pics needed, ask me.

bit more info for the records:

boot log from your backup


query things data model


prettier query things data model

query device details

Whaouh, great job, we now have all the dpid for this 1103 C, i put them in clear way:
Very great job thx a lot for all the details
baud 9600


| dpID | Code | Description | Unit | Scale | OpenBeken Type |
|------|------|-------------|------|-------|----------------|
| **112** | voltage_a | Voltage | V | ÷10 | Voltage_div10 |
| **113** | current_a | Current A | mA | ÷1 | Current_Div1000 |
| **114** | current_b | Current B | mA | ÷1 | Current_Div1000 |
| **101** | power_a | Active Power A | W | ÷10 | Power_Div10 |
| **105** | power_b | Active Power B | W | ÷10 | Power_Div10 |
| **106** | energy_forword_a | Forward Energy A | kWh | ÷100 | EnergyTotal_kWh_div100 |
| **107** | energy_reverse_a | Reverse Energy A | kWh | ÷100 | EnergyTotal_kWh_div100 |
| **108** | energy_forword_b | Forward Energy B | kWh | ÷100 | EnergyTotal_kWh_div100 |
| **109** | energy_reserse_b | Reverse Energy B | kWh | ÷100 | EnergyTotal_kWh_div100 |
| **110** | power_factor | Power Factor A | % | ÷100 | ReadOnly |
| **121** | power_factor_b | Power Factor B | % | ÷100 | ReadOnly |
| **111** | freq | Frequency | Hz | ÷100 | ReadOnly |
| **115** | total_power | Total Power | W | ÷10 | Power_Div10 |
| **130** | forward_energy_total | Total Forward Energy | kWh | ÷100 | EnergyTotal_kWh_div100 |
| **131** | reverse_energy_total | Total Reverse Energy | kWh | ÷100 | EnergyTotal_kWh_div100 |
| **102** | direction_a | Flow Direction A | - | enum | ReadOnly |
| **104** | direction_b | Flow Direction B | - | enum | ReadOnly |

| dpID | Code | Description | Range | Scale |
|------|------|-------------|-------|-------|
| **116** | voltage_coef | Voltage Calibration | 800-1200 | ÷1000 |
| **117** | current_a_calibration | Current A Calibration | 800-1200 | ÷1000 |
| **118** | power_a_calibration | Power A Calibration | 800-1200 | ÷1000 |
| **119** | energy_a_calibration_fwd | Forward Energy A Calibration | 800-1200 | ÷1000 |
| **122** | freq_calibration | Frequency Calibration | 800-1200 | ÷1000 |
| **123** | current_b_calibration | Current B Calibration | 800-1200 | ÷1000 |
| **124** | power_b_calibration | Power B Calibration | 800-1200 | ÷1000 |
| **125** | energy_b_calibration_fwd | Forward Energy B Calibration | 800-1200 | ÷1000 |
| **127** | energy_a_calibration_rev | Reverse Energy A Calibration | 800-1200 | ÷1000 |
| **128** | energy_b_calibration_rev | Reverse Energy B Calibration | 800-1200 | ÷1000 |

| dpID | Code | Description | Range/Type |
|------|------|-------------|------------|
| **129** | report_rate_control | Report Rate | 3-60 seconds |
| **132** | buz_enable | Buzzer Enable | bool |
| **133** | ov_enable | Over-Voltage Alarm Enable | bool |
| **134** | uv_enable | Under-Voltage Alarm Enable | bool |
| **135** | oc_enable | Over-Current A Alarm Enable | bool |
| **136** | op_enable | Over-Power A Alarm Enable | bool |
| **149** | oc_enable_b | Over-Current B Alarm Enable | bool |
| **150** | op_enable_b | Over-Power B Alarm Enable | bool |

| dpID | Code | Description | Range | Scale | Unit |
|------|------|-------------|-------|-------|------|
| **137** | ov_threshold | Over-Voltage Threshold | 800-2600 | ÷10 | V |
| **138** | uv_threshold | Under-Voltage Threshold | 800-2600 | ÷10 | V |
| **139** | oc_threshold | Over-Current A Threshold | 0-150000 | ÷1000 | A |
| **140** | op_threshold | Over-Power A Threshold | 1-600000 | ÷1 | W |
| **145** | oc_threshold_b | Over-Current B Threshold | 0-150000 | ÷1000 | A |
| **146** | op_threshold_b | Over-Power B Threshold | 1-600000 | ÷1 | W |

| dpID | Code | Description | Type |
|------|------|-------------|------|
| **141** | ov_status | Over-Voltage Status | bool |
| **142** | uv_status | Under-Voltage Status | bool |
| **143** | oc_status | Over-Current A Status | bool |
| **144** | op_status | Over-Power A Status | bool |
| **147** | oc_status_b | Over-Current B Status | bool |
| **148** | op_status_b | Over-Power B Status | bool |

| dpID | Code | Description | Type |
|------|------|-------------|------|
| **120** | coef_a_reset | Reset Calibration CT A | bool |
| **126** | coef_b_reset | Reset Calibration CT B | bool |