[Solved] [T34 BK7231N] Tuya Wifi Smart Plug: Flashing, Configuration, and Power Monitoring Options

Question 1

T34 plugs typically ship with either BL0937 or BL0942 power ICs. There’s a 50% chance yours is BL0942. “BL0942 is always on the same UART port.” If BL0942, enable the BL0942 driver and calibrate. Otherwise, configure BL0937 by assigning CF, CF1, and SEL pins in OpenBK. [Elektroda, p.kaczmarek2, post #20414439]

Answer

T34 plugs typically ship with either BL0937 or BL0942 power ICs. There’s a 50% chance yours is BL0942. “BL0942 is always on the same UART port.” If BL0942, enable the BL0942 driver and calibrate. Otherwise, configure BL0937 by assigning CF, CF1, and SEL pins in OpenBK. [Elektroda, p.kaczmarek2, post #20414439]

Question 2

Count the pins. BL0937 packages have 8 pins; BL0942 has 10 pins. Board photos in the thread show this difference clearly. If you see 8 pins, use BL0937 with CF, CF1, and SEL mapping. With 10 pins, proceed using the BL0942 driver. [Elektroda, p.kaczmarek2, post #20414537]

Answer

Count the pins. BL0937 packages have 8 pins; BL0942 has 10 pins. Board photos in the thread show this difference clearly. If you see 8 pins, use BL0937 with CF, CF1, and SEL mapping. With 10 pins, proceed using the BL0942 driver. [Elektroda, p.kaczmarek2, post #20414537]

Question 3

Use Windows BK7231GUIFlashTool v1.15.305 and flash OpenBK7231N_QIO_1.15.391. After flashing, configure Wi‑Fi LED, relay, and power monitoring in the web UI. This tool and firmware combination was confirmed working on the T34. [Elektroda, Svetlaya, post #20414363]

Answer

Use Windows BK7231GUIFlashTool v1.15.305 and flash OpenBK7231N_QIO_1.15.391. After flashing, configure Wi‑Fi LED, relay, and power monitoring in the web UI. This tool and firmware combination was confirmed working on the T34. [Elektroda, Svetlaya, post #20414363]

Question 4

Wire P10→TX and P11→RX on your USB‑TTL adapter. Provide 3.3 V to 3.3 and GND to GND. Pull CEN to GND to enter flash mode. This wiring allowed successful flashing on the T34 board. [Elektroda, Svetlaya, post #20414363]

Answer

Wire P10→TX and P11→RX on your USB‑TTL adapter. Provide 3.3 V to 3.3 and GND to GND. Pull CEN to GND to enter flash mode. This wiring allowed successful flashing on the T34 board. [Elektroda, Svetlaya, post #20414363]

Question 5

Answer

Enter "startDriver BL0942" in Config > Startup command and save.
Reboot the device.
Verify readings, then calibrate with VoltageSet, PowerSet, and CurrentSet. This sequence starts the BL0942 driver and brings up measurements for calibration. [Elektroda, p.kaczmarek2, post #20414439]

Question 6

Do not add a startDriver line. Map BL0937’s CF, CF1, and SEL to the correct BK GPIOs in Config > Device. “You need to set all 3 pins.” Reboot so the driver starts. Trace pads with a multimeter to confirm each signal before assigning. Setting only two lines prevents valid readings. [Elektroda, p.kaczmarek2, post #20414537]

Answer

Do not add a startDriver line. Map BL0937’s CF, CF1, and SEL to the correct BK GPIOs in Config > Device. “You need to set all 3 pins.” Reboot so the driver starts. Trace pads with a multimeter to confirm each signal before assigning. Setting only two lines prevents valid readings. [Elektroda, p.kaczmarek2, post #20414537]

Question 7

Large or nonsense readings usually mean the wrong driver or bad calibration. If your meter IC is 8‑pin BL0937, BL0942 won’t work. Clear the BL0942 startup command, map CF/CF1/SEL for BL0937, reboot, then calibrate. Readings normalize once the correct method is used. [Elektroda, p.kaczmarek2, post #20414537]

Answer

Large or nonsense readings usually mean the wrong driver or bad calibration. If your meter IC is 8‑pin BL0937, BL0942 won’t work. Clear the BL0942 startup command, map CF/CF1/SEL for BL0937, reboot, then calibrate. Readings normalize once the correct method is used. [Elektroda, p.kaczmarek2, post #20414537]

Question 8

Open Config > Startup command, delete the line, save, and reboot. This stops the driver from starting at boot. Use this when switching from a BL0942 attempt to the BL0937 pin‑mapped setup. [Elektroda, p.kaczmarek2, post #20414537]

Answer

Open Config > Startup command, delete the line, save, and reboot. This stops the driver from starting at boot. Use this when switching from a BL0942 attempt to the BL0937 pin‑mapped setup. [Elektroda, p.kaczmarek2, post #20414537]

Question 9

On the T34 board, labels like “cv” and “H” appear near meter pads. Use a multimeter to trace these pads to BK pins and assign CF, CF1, and SEL accordingly in Config > Device. Reboot after saving your mapping. [Elektroda, p.kaczmarek2, post #20418053]

Answer

On the T34 board, labels like “cv” and “H” appear near meter pads. Use a multimeter to trace these pads to BK pins and assign CF, CF1, and SEL accordingly in Config > Device. Reboot after saving your mapping. [Elektroda, p.kaczmarek2, post #20418053]

Question 10

For BL0942, use VoltageSet, PowerSet, and CurrentSet to align with known voltage and load. Calibrate only after readings appear. OpenBK follows Tasmota‑style calibration, so values adjust live. Reboot if needed to apply changes cleanly. [Elektroda, p.kaczmarek2, post #20414439]

Answer

For BL0942, use VoltageSet, PowerSet, and CurrentSet to align with known voltage and load. Calibrate only after readings appear. OpenBK follows Tasmota‑style calibration, so values adjust live. Reboot if needed to apply changes cleanly. [Elektroda, p.kaczmarek2, post #20414439]

Question 11

Yes. Run: backlog startDriver SSDP; startDriver NTP. SSDP exposes the device in Windows Network. NTP keeps the clock synced from the internet. Add the backlog to Startup for persistence. [Elektroda, p.kaczmarek2, post #20419851]

Answer

Yes. Run: backlog startDriver SSDP; startDriver NTP. SSDP exposes the device in Windows Network. NTP keeps the clock synced from the internet. Add the backlog to Startup for persistence. [Elektroda, p.kaczmarek2, post #20419851]

Question 12

Two verified modes: 1) Blue when connected, off when disconnected. 2) Blink blue while connecting, then off after connection. Assign the LED roles in OpenBK per your preference. Both modes worked on the T34 after flashing. [Elektroda, Svetlaya, post #20414363]

Answer

Two verified modes: 1) Blue when connected, off when disconnected. 2) Blink blue while connecting, then off after connection. Assign the LED roles in OpenBK per your preference. Both modes worked on the T34 after flashing. [Elektroda, Svetlaya, post #20414363]

Question 13

A user reported three months of continuous operation without issues after flashing and configuration. This indicates stable behavior under normal use. Recheck calibration if mains conditions or loads change. [Elektroda, Svetlaya, post #20566330]

Answer

A user reported three months of continuous operation without issues after flashing and configuration. This indicates stable behavior under normal use. Recheck calibration if mains conditions or loads change. [Elektroda, Svetlaya, post #20566330]

Question 14

Identify by package and tracing. Count pins (8 for BL0937, 10 for BL0942). If markings are unclear, count pins, then probe labeled pads (e.g., “cv”/“H”) to map CF/CF1/SEL before configuring. [Elektroda, p.kaczmarek2, post #20414537]

Answer

Identify by package and tracing. Count pins (8 for BL0937, 10 for BL0942). If markings are unclear, count pins, then probe labeled pads (e.g., “cv”/“H”) to map CF/CF1/SEL before configuring. [Elektroda, p.kaczmarek2, post #20414537]

Question 15

Yes. The author shared a video demonstrating control of the flashed T34 in MajorDoMo. Follow the shown approach for automation after OpenBK setup. [Elektroda, Svetlaya, post #20442507]

Answer

Yes. The author shared a video demonstrating control of the flashed T34 in MajorDoMo. Follow the shown approach for automation after OpenBK setup. [Elektroda, Svetlaya, post #20442507]

[Solved] [T34 BK7231N] Tuya Wifi Smart Plug: Flashing, Configuration, and Power Monitoring Options

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