logo elektroda
logo elektroda
X
logo elektroda
Advanced Search
logo elektroda

missing config pinout from bin - NOVADIGITAL Wall Power Outlet CB2S BK7231N

tadeu1 492 21
Best answers

How can I identify and fix the missing or incorrect pinout in the extracted CB2S/BK7231N configuration for a NOVADIGITAL wall power outlet when the BL0937 power readings are wrong or unstable?

The wrong or missing pin is most likely the BL0937 CF connection, not SEL or CF1; CF is the pin that reports power, while CF1 handles current/voltage depending on SEL [#21807434] OBK needs all three BL0937-related pins configured to auto-start the driver, and the driver will only use one valid assignment, so a bad or open hardware connection can look like a pinout problem [#21807612][#21807615] If the readings still jump around after recalibration, the extracted config may be fine and the fault is likely on the PCB or solder joint [#21807651] In this thread, resoldering did not fully solve it, but adding a jumper between the BL0937 and the CB2S fixed the issue, confirming a hardware connection problem [#21807687]
Generated by the language model.
ADVERTISEMENT
Report a violation of the law
Reply | New topic
  • #1 21807160
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    NOVADIGITAL WALL POWER OUTLET

    I just extract the config from the firmware, I cannot get some info


    Screenshot of electrical energy data with zero energy consumption


    Configuration interface with dropdown menus and numeric input fields

    looks like one of the pin is not correct
    ---------
    JSON
    ----------
    {
    "sel_pin_pin":"8",
    "rl1_lv":"1",
    "bt1_pin":"26",
    "net_trig":"1",
    "jv":"1.0.5",
    "netled1_lv":"0",
    "netled_reuse":"1",
    "bt1_type":"0",
    "ffc_select":"1",
    "vi_pin":"7",
    "resistor":"1",
    "over_cur":"21000",
    "bt1_lv":"0",
    "reset_t":"5",
    "netled1_pin":"10",
    "chip_type":"0",
    "lose_vol":"96",
    "over_vol":"265",
    "module":"CB2S",
    "ele_pin":"6",
    "ch_cddpid1":"9",
    "ch1_stat":"2",
    "rl1_type":"0",
    "ch_num":"1",
    "ele_fun_en":"1",
    "rl1_pin":"24",
    "vol_def":"0",
    "ch_dpid1":"1",
    "sel_pin_lv":"1",
    "crc":"70"
    }

    ----------
    TEXT
    ----------
    Device configuration, as extracted from Tuya:
    - BL0937 SEL on P8
    - Button (channel 1) on P26
    - BL0937 VI (CF1) on P7
    - WiFi LED on P10
    - BL0937 ELE (CF) on P6
    - Relay (channel 1) on P24
    Device seems to be using CB2S module, which is using BK7231N.
    And the Tuya section starts, as usual, at 2023424
    Attachments:
    • TOMADA - PAREDE - NOVADIGITAL - 1 SAIDA.bin (2 MB) You must be logged in to download this attachment.
  • ADVERTISEMENT
  • #2 21807198
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    Did you calibrate the plug (on the "Tools" page of Web App)?
    Are the values slightly changing?
  • #3 21807411
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    >>21807198
    Yeah, I did. Also I rechecked the solder points to see if it's OK and is!

    Is it possible the app extracted the wrong points?

    Added after 3 [minutes]:

    There's no BL0937SEL_i? I find some in Tasmota inverted.
  • #4 21807422
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    If it's inverted, in OBK it's "_n" so maybe BL0937SEL_n for you?

    File list with BL0937SEL_n highlighted

    In that case, if I got it right, voltage and current would be exchanged.

    But missing power values are strange, even in this case, I would expect some "unexpected" values, but "0"?!?
  • #5 21807432
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    >>21807422 There's no n for obk right?
    Yeah, that's weird. ;-(
  • ADVERTISEMENT
  • #6 21807434
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    Thinking about it, probably CF pin is not correct (or connection is broken), this pin will read BL0937's power, while CF1 reads current/voltage, depending on SEL value.

    Table describing the pin functions of the BL0937 energy meter IC by Shanghai Belling
  • ADVERTISEMENT
  • #7 21807519
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    That's weird
    I just leave the rel and btn (I know both are working)



    Dropdown list and number fields from 0 to 28 with labels “Rel” and “Btn”
    And still showing


    Screenshot of electrical parameters and energy consumption data.
  • #8 21807524
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    If you don't stop the driver (ore restart), it will continue.
    IIRC only if you change the pins for the chip, the driver will use the new pins. If you "delete" them, it will continue with the old pin assignment.
  • #9 21807526
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    Also I cleared all in gpio doctos


    GPIO Doctor tool interface with pin list and configuration buttons.


    And still

    Screenshot of electrical data: voltage 232.6V, current 0.533A, power 0.00W



    It's weird, right?
  • #10 21807547
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    max4elektroda wrote:
    If you don't stop the driver (ore restart), it will continue.

    But you stopped the driver or restarted after clearing the pins?
  • #11 21807560
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    I'm trying to check the pinout from bl0973
    Pinout diagram of the BL0937 integrated circuit with labeled pins

    to the CB2S pin, just gnd and 3.3 Its connect, the cf cf1 and sel the multimeter dont beep. omg;;;

    Added after 6 [minutes]:

    >>21807547 ill try it
  • #12 21807574
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    At least CF1 should be right, since you get some readings and SEL for the values seem "o.k.".
    I can force the same here by assigning CF to a wrong pin (and, sorry, seems I was wrong, I restarted the plug after changing the pin assignment)


    Device interface screen showing electrical data and green Toggle 0 button
  • #13 21807595
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    >>21807574

    I set same voltage and current just to check if var its looks like same and I get 27.30 too ;-)

    I can set all pins no selected to CF? its should work?

    Added after 6 [minutes]:

    dumb questions, theres I way if I return to the original firware to recheck it?
  • #14 21807612
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    You need to set all three related pis in order to automatically start the bl0937 driver.

    Since you did a backup you should be able to flash it back (but sadly I think only via UART, not with OTA).
  • ADVERTISEMENT
  • #15 21807613
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    I just resolder 3 times, with the micorsope.
    I take out, clean, and resolder again.
    now its working.

    sorry man,
  • Helpful post
    #16 21807615
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    Sorry misread the question: That would not help, the driver will only take one (the first, if I'm not mistaken).
    Or it would help, if you later start to clear them one by one (and reboot) until the correct one is found...
  • #17 21807618
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    now its almost


    Screenshot of electrical data showing 3285 W power at low current of 0.056 A


    and change agian to the correct

    Screenshot showing voltage, current, power, and energy readings from BL0937 meter
  • Helpful post
    #18 21807619
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    Don't worry, glad to hear it's working, so I expect the extracted pin was correct?
  • #19 21807627
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    >>21807619

    almost
    I get the correct power, and after 1 second, wrong, its back to correnct and back to wrong.
    like a loop
  • Helpful post
    #20 21807651
    max4elektroda
    Level 24  
    Posts: 745
    Help: 47
    Rate: 183
    Only power, current and voltage o.k.?
    Did you enable powersave? That doesn't work well together with BL0973.
    Else I'm running out of ideas, if connection now is fine...
  • #21 21807687
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    I did a jump from the bl0973 and cb2s, its ok now, something is wrong with the pcb ;-(

    Added after 1 [hours] 6 [minutes]:


    Refrigerator control panel showing power consumption and cost values
    WORKING FLAWLESS
  • #22 21807756
    tadeu1
    Level 5  
    Posts: 80
    Help: 2
    Rate: 3
    JUMP BETWEEN BL0973 AND CB2S
Reply | New topic
Report a violation of the law

Topic summary

✨ The discussion addresses issues extracting and verifying the correct pinout configuration from the firmware of the NOVADIGITAL Wall Power Outlet model CB2S with BK7231N chip. The user extracted a JSON configuration but encountered incorrect or missing pin assignments, particularly related to the BL0937 energy metering IC pins such as SEL, CF, and CF1. Troubleshooting involved checking solder joints, verifying pin continuity with a multimeter, and testing different pin assignments including inverted signals (e.g., BL0937SEL_n). It was noted that the BL0937 driver requires all related pins correctly assigned and the device restarted to apply changes. The user eventually identified a faulty PCB connection affecting the CF pin, resolved by creating a jumper wire between BL0973 and CB2S pins, restoring accurate power, voltage, and current readings. The discussion highlights the importance of correct pin mapping, driver restart after configuration changes, and hardware verification for reliable energy metering on this device.
Generated by the language model.
Today's popular

FAQ

TL;DR: The NOVADIGITAL CB2S (BK7231N) outlet’s BL0937 uses 3 metering pins (CF, CF1, SEL); if CF is wrong, power shows 0. As one expert notes, "CF1 reads current/voltage." [Elektroda, max4elektroda, post #21807434]

Why it matters: This FAQ helps OpenBeken users fix missing/incorrect BL0937 pinouts and get real power readings on this Tuya-based outlet.

Quick-Facts

Quick Facts

What’s the correct BL0937/CB2S pinout for this outlet?

From the extracted config: BL0937 SEL→P8, VI/CF1→P7, ELE/CF→P6; Wi‑Fi LED→P10; Button CH1→P26; Relay CH1→P24. [Elektroda, tadeu1, post #21807160]

Why do I see 0 W power but changing voltage/current?

CF likely goes to the wrong pin or is disconnected. CF outputs power pulses; CF1 outputs V/I depending on SEL. If CF is wrong, watts stay at 0 even when V/I move. "CF1 reads current/voltage." [Elektroda, max4elektroda, post #21807434]

Do I need to restart OpenBeken after changing BL0937 pins?

Yes. The driver continues with previous pins until you stop it or restart the device. After editing pins, stop the BL0937 driver or reboot to apply. [Elektroda, max4elektroda, post #21807524]

How do I calibrate readings in OpenBeken?

Use the Web App’s Tools page to run calibration. Confirm that values change slightly while adjusting. If not, revisit pin mapping first. [Elektroda, max4elektroda, post #21807198]

Is there an inverted SEL option in OBK?

Yes. OpenBeken uses the “_n” suffix for inverted signals, such as BL0937SEL_n. This mirrors what you might know as “inverted” in other firmware. [Elektroda, max4elektroda, post #21807422]

What does the Tuya dump tell me about this device?

It’s a CB2S module with BK7231N. The Tuya config section begins near byte offset 2,023,424. Use that offset if you parse the blob again. [Elektroda, tadeu1, post #21807160]

I cleared pins but still see meter values—bug?

Not a bug. The BL0937 driver keeps running with old pins until you stop it or restart. Clear pins, stop driver, then reboot. [Elektroda, max4elektroda, post #21807524]

Can I test only the relay and button while metering is broken?

Yes. Map Relay→P24 and Button→P26 to verify switching and input. Meter tiles may still display until you stop/restart the driver. [Elektroda, tadeu1, post #21807519]

My multimeter shows no continuity on CF/CF1/SEL—what next?

Reinspect solder joints and follow traces visually. The user saw GND/3.3 V continuity but none on CF/CF1/SEL. Recheck routing from BL0937 to CB2S pads. [Elektroda, tadeu1, post #21807560]

Quick steps: How do I apply new BL0937 pins cleanly?

  1. Stop the BL0937 driver in the Web App.
  2. Set CF, CF1, and SEL pins, then save.
  3. Restart the device to load the new mapping. [Elektroda, max4elektroda, post #21807524]

What do CF, CF1, and SEL actually do?

CF outputs active power pulses. CF1 outputs either current or voltage. SEL chooses whether CF1 reports current or voltage at any moment. [Elektroda, max4elektroda, post #21807434]

Can SEL make voltage and current appear swapped?

Yes. If SEL is inverted or mis-set, CF1 will report the opposite metric. Expect V/I to exchange until SEL is corrected. [Elektroda, max4elektroda, post #21807422]

Which channel pins control relay and button on this unit?

Relay channel 1 uses P24. Button channel 1 uses P26. These matched both the JSON and on-device tests. [Elektroda, tadeu1, post #21807160]

What protection thresholds does the extracted config show?

Typical values found: over-current 21000 (units from OEM), over-voltage 265, and low-voltage 96. Treat as starting points; verify during calibration. [Elektroda, tadeu1, post #21807160]
Generated by the language model.
ADVERTISEMENT