[BK7231N/CBU] Door sensor without TuyaMCU - how to connect to UART RX/TX

To align the magnet and device during installation, it can be helpful to assign pin 26 to the LED instead of WifiLED_n. This allows you to see immediately whether the magnet is triggering or not.



You can set it back to WifiLED_n afterwards.

btw. Is there a way to increase the sensitivity of the sensor or adjust the threshold value? Background: I have a window with two sashes and would like to attach the device to one and a stronger magnet to the other to monitor both. So far, I have achieved a detection distance of approx. 10cm, which is about 5cm short of a reliable detection.

Hi everyone,
I'm new to OpenBeken and I need some help with my Beken BK7231N door sensor.
It seems to be bricked and I'm at a loss on how to proceed.

Here's the story:
I flashed OpenBeken using the GUIFlashTool, performing a backup and extracting the Tuya config. The device then entered AP mode. I set up the network SSID, MQTT, and the module config (initially, the first one I found in a thread, which wasn't quite right). It connected to my Wi-Fi, and the door sensor worked, but it wouldn't enter deep sleep (the timer kept resetting at 60 seconds).

After reading more of your forum, I tried new module configurations. The device then seemed to enter deep sleep, but I couldn't wake it up, especially not with the button, as it wasn't configured on the correct pin but on the wrong channel. Since it was in deep sleep, I couldn't access the web interface to correct the configuration.

I attempted a soft reset with multiple consecutive power cycles. During some of these, the LED configured as Wifi_n would light up. Then, that stopped working too. After several attempts, the module now seems completely unresponsive, only emitting a buzzing sound when powered.

Initially, I was using rechargeable NiMH batteries. Since it seemed to have died, I've switched to new alkaline batteries, which should provide the expected power.

Today, I tried reconnecting it via serial. I can still read and write to the chip.

First, I read, modified, and rewrote the configuration – first the correct one for the hall sensor and button, then all to None:0. But after rebooting, still no sign of life (no AP, no STA). I then tried to rewrite the firmware. Reboot, nothing. I even tried restoring the RF partition (which required a lower baud rate). Reboot, still nothing.

It really feels like it's in a "sleep of death."
I'm quite new to OpenBeken and have no idea how to fix this. Any suggestions would be greatly appreciated!