I am looking for a solution like the Tuya Smart Wifi smoke detector can use without Tuya APP / Cloud.
I can’t connect and flash the devices are with “Tuya Convert”. Also try this via the serial interface Flashing with Tasmota or ESP Home, but also this failed.
Description:
Input Voltage: DC9V alkaline battery (Not Include)
Static current:＜10uA
Alarm Current:＜100mA
Low battery alert:≤6.5±0.5V
Alarm Sound Level:＞90db/2m(2.4GHz)
WIFI: 802.11b/g/n
Working Temperature:-10-50℃
Working Humidity: ≤95%RH
Tuya/Smart Life APP control
Works with Amazon Alexa / Google assistant
Looks like a Beken chip (BK7231N).
You have 2 options
CB3S has the same pinout as ESP12F/S
You could desolder the chip and replace it with esp.
Flash openbk firmware for beken, there’s support for tuyamcu (based on smoke detector config for tasmota). You could raise an issue on how to configure it after flashing
Thanks, openbk firmware looks good. Just have to find a way how I can transfer the firmware with OSX (iMac) and a USB to TTL converter or how I can do it with a Raspberry rb3b.
@petsie - any luck flashing it? I have the exact same ones and tried the python method on a MacOs and on windows with no luck. I keep getting cannot get bus. even after i tried shorting CEN and GND
Yes, that would be the tool
Generally the steps are:
copy firmware file to custom-firmware folder
run_flash script
pick the profile based on tuya firmware version
reset the device until the device ap shows up
let the tool do its magic
reset the device the 2nd time, if the profile works, the ap prefix would start with ‘A-xxx’ instead of ‘smartlife-xxx’ and starts flashing the firmware.
