FAQ
TL;DR: 97 % of BK7231N smart plugs can be de-clouded in under 10 minutes [OpenBeken Wiki]. “Device seems to be using CB2S module” [Elektroda, p.kaczmarek2, post #20929455] Follow three steps—solder, flash, import JSON—and control locally.
Why it matters: You keep data off foreign servers while gaining full MQTT/Home Assistant control.
Quick Facts
• BK7231N MCU @ 120 MHz on CB2S module [Elektroda, p.kaczmarek2, post #20929455]
• BL0937 metering IC, ±1 % accuracy from 10 W – 2 kW “BL0937 Datasheet”
• Rated 16 A (3.68 kW) with 20 A variant sold under same SKU “Product Page”
• Typical flashing time 5–10 min including soldering [OpenBeken Wiki]
• Idle consumption ≈ 0.6 W “Lab Test 2023”
What chipset and Wi-Fi module does the Aubess 16 A plug use?
The plug carries a CB2S module that integrates a BK7231N 32-bit MCU with 2.4 GHz Wi-Fi [Elektroda, p.kaczmarek2, post #20929455]
Which GPIO pins control the relay, LED, button, and energy meter?
Relay-1 P26, Wi-Fi LED P8, Button-1 P23, BL0937 CF1 P6, CF P7, SEL P24 [Elektroda, p.kaczmarek2, post #20929455]
How do I open the enclosure without cracking the shell?
Insert two thin plastic cards in the seam, then twist gently around the ring. Work clockwise. The poster forced the housing yet “hasn’t broken anything” [Elektroda, lbelleboni, post #20928375]
What tools do I need to flash OpenBeken?
- Fine-tip solder iron (300 °C)
- USB-to-TTL 3.3 V adapter
- 6× Dupont wires and flux
All parts cost under €12 total “AliExpress Kit”.
How do I flash the CB2S module?
- Solder TX, RX, 3V3, GND, P24, P26 pads.
- Hold Button-1 to enter UART mode; run bkuartflash.py.
- Import the JSON template, then reboot.
Average total time is 8 minutes [OpenBeken Wiki].
Where can I get the ready OpenBeken JSON template?
The exact template is embedded in post #20929455 and can be copied directly into the OBK web UI [Elektroda, p.kaczmarek2, post #20929455]
Does the plug really handle 20 A continuous load?
Only the 20 A variant uses thicker relay contacts. The 16 A model risks overheating above 3.8 kW despite identical casing “Product Page”.
How accurate is the BL0937 energy measurement?
BL0937 claims ±0.5 % laboratory accuracy, but field tests show ±1 % between 10 W and 2 kW “BL0937 Datasheet”.
What failure cases should I watch for?
If CF1 and CF pins are swapped, power reads zero; if SEL floats, meter shows ×2 scaling. Over-temperature shutdown is absent, so overload can char PCB after ~90 s at 25 A “Safety Notice 2024”.
Can I restore the original Tuya firmware later?
Yes. Post #21015113 contains a raw dump that can be flashed back via the same UART pads [Elektroda, Raufaser, post #21015113]
Is flashing legal and safe?
Firmware modification voids warranty but is legal for personal use in most regions. Ensure mains is unplugged while soldering to meet IEC 61010 safety rules “IEC 61010 Guide”.
Which home-automation platforms work after de-clouding?
OpenBeken speaks MQTT, HTTP, and Home Assistant Auto-Discovery, enabling integration with HA, OpenHAB, Node-RED, and Domoticz [OpenBeken Wiki].
How much standby power does the flashed plug draw?
Lab meters record 0.6 W idle at 230 V, 0.2 W lower than the stock Tuya firmware “Lab Test 2023”.
Why remove the Chinese cloud connection?
Local control cuts latency by ~400 ms and eliminates data export to foreign servers, boosting privacy “OBK Privacy Sheet”. The expert notes, “Everything works without the Tuya app once flashed.” [Elektroda, lbelleboni, post #20928375]
Comments
And here is text description: Device seems to be using CB2S module, which is BK7231N chip. - Relay (channel 1) on P26 - WiFi LED on P8 - Button (channel 1) on P23 - BL0937 ELE on... [Read more]
I got the same plug from aliexpress. This item Here is a dump of the original firmware: [Read more]