I bought the Intelligent Spray System WD-01CE (which also goes by some different names). It's used to spray water, therefore contains a pump, a button with an LED, and a piezo module. It's pretty easy to unscrew after removing the 4 pads over the screws. After unscrewing, you can see the pump...

First of all, please check if there is anything else connected on UART lines. Are they used for something else than flashing, maybe for a button, or for a relay, or something like this?Is this your first Beken chip you are flashing? Have you made sure to provide enough current for your device? Have you tried swapping RX and TX? Are you flashing it in BK7231N mode? BK7231T mode will not work for N.

Yeah, it's my first time flashing. I solved it. On the Tuya sheet, they showed it from the bottom, so I used RX01 and TX01, which are for logging. On the other side, there are the RX and TX pins for programming (hard to solder). The only thing I am now missing is, what would you set for P6 as it is a buzzer? In the dropdown menu, I didn't find something like it. Currently, I have set it as LED.

I didn't have any buzzer devices yet. Maybe you can try to set it as PWM, enable show RAW PWM controllers flag and then check if doing set channel can get you a tone out of it?

a little bit more info derived from a WD-01CE backup sourced elsewhere (thanks @piotrszulc1). all info is taken from this file, attached. boot: Code: TextLog in, to see the code

config data in binary after device config is pulled down from Tuya Code: JSONLog in, to see the code Added after 4 [minutes]: how it presents in Tuya app fw v1.1.7 is on the Cloudcutter known patched list Added after 3 [minutes]: @kilianeller12 did you get a fully working device with OpenBeken?

>>20626424 For WD-01CE, is it possible to change firmware through OTA?

[BK7231N/CBU] Intelligent Spray System WD-01CE Pump how to flash, getting bus failed

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BK7231N pinout for WD-01CE spray pump
#1 20624497 20 Jun 2023 15:40

kilianeller12 kilianeller12

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BK7231N pinout for WD-01CE spray pump
Post #1 20624497 20 Jun 2023 15:40

I bought the Intelligent Spray System WD-01CE (which also goes by some different names).

It's used to spray water, therefore contains a pump, a button with an LED, and a piezo module.

It's pretty easy to unscrew after removing the 4 pads over the screws.

After unscrewing, you can see the pump and the board.

To remove the board, 3 screws need to be unscrewed.

According to my research on https://developer.tuya.com/en/docs/iot/CBU-NL-module-datasheet?id=Kbaeq6j53y0yg, it uses the BK7231N chip the pins are the following:

The pinout for setup is:

P6 - Buzzer
P8 (PWM2) - Btn
P16 - REL
P20 - LED_n
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Check for UART line conflicts and BK7231N mode
#2 20624606 20 Jun 2023 17:37

p.kaczmarek2 p.kaczmarek2

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Check for UART line conflicts and BK7231N mode
Post #2 20624606 20 Jun 2023 17:37

First of all, please check if there is anything else connected on UART lines. Are they used for something else than flashing, maybe for a button, or for a relay, or something like this?

Is this your first Beken chip you are flashing? Have you made sure to provide enough current for your device? Have you tried swapping RX and TX? Are you flashing it in BK7231N mode? BK7231T mode will not work for N.

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

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Programming pins on the opposite side of the Tuya board
#3 20624666 20 Jun 2023 18:17

kilianeller12 kilianeller12

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Programming pins on the opposite side of the Tuya board
Post #3 20624666 20 Jun 2023 18:17

Yeah, it's my first time flashing.
I solved it. On the Tuya sheet, they showed it from the bottom, so I used RX01 and TX01, which are for logging. On the other side, there are the RX and TX pins for programming (hard to solder).

The only thing I am now missing is, what would you set for P6 as it is a buzzer? In the dropdown menu, I didn't find something like it. Currently, I have set it as LED.
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#4 20626424 22 Jun 2023 06:07

p.kaczmarek2 p.kaczmarek2

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Post #4
20626424 22 Jun 2023 06:07

I didn't have any buzzer devices yet. Maybe you can try to set it as PWM, enable "show RAW PWM controllers" flag and then check if doing set channel can get you a tone out of it?

I am creating multiplatform open source firmware (Tasmota replacement), right now supporting BK7231T, BK7231N, XR809, BL602, W800, W600, LN882H and soon supporting RTL and W701:
https://github.com/openshwprojects/OpenBK7231T
If you like my work, support me at: https://paypal.me/openshwprojects

Helpful post? Buy me a coffee.
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WD-01CE boot log and Tuya SDK details
#5 21273199 22 Oct 2024 19:09

divadiow divadiow

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WD-01CE boot log and Tuya SDK details
Post #5 21273199 22 Oct 2024 19:09

a little bit more info derived from a WD-01CE backup sourced elsewhere (thanks @piotrszulc1). all info is taken from this file, attached.

boot:
Code: Text
Log in, to see the code

Attachments:

WD-01CE.bin (2 MB) You must be logged in to download this attachment.
Tuya config dump with UUID and keys
#6 21273201 22 Oct 2024 19:19

divadiow divadiow

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Tuya config dump with UUID and keys
Post #6 21273201 22 Oct 2024 19:19

config data in binary after device config is pulled down from Tuya

Code: JSON
Log in, to see the code

Added after 4 [minutes]:

how it presents in Tuya app

fw v1.1.7 is on the Cloudcutter known patched list

Added after 3 [minutes]:

@kilianeller12 did you get a fully working device with OpenBeken?
#7 21915933 05 Jun 2026 13:03

forl3eaf forl3eaf

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Post #7
21915933 05 Jun 2026 13:03

>>20626424
For WD-01CE, is it possible to change firmware through OTA?
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Topic summary

Discussion about flashing a Tuya-based Intelligent Spray System WD-01CE using a BK7231N/CBU module. The device contains a pump, LED/button, and piezo buzzer, with pin mapping identified for buzzer, button, relay, and LED. Initial flashing failed because the wrong UART pads were used; the correct programming RX/TX pins were on the opposite side of the board, while the visible RX01/TX01 pads were only for logging. After successful access, the remaining question was how to configure the buzzer pin P6 in the firmware, with PWM suggested as a possible option. Later posts added backup-derived firmware/configuration data from the device and asked whether WD-01CE firmware can be changed via OTA.
AI summary based on the discussion. May contain errors.

[BK7231N/CBU] Intelligent Spray System WD-01CE Pump how to flash, getting bus failed

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