Good afternoon. I have a led lamp with a bk7321 processor and a sht30 sensor on my hands. I don't need it as a lamp, but I need it as a temperature and humidity meter. What firmware do I need to upload to it? To implement this. Sorry for my english, I'm from Ukraine. Thank you

Name: [BK7231T/WBLC5] How to attach SHT30 sensor to smart Tuya LED?
Uploaded: 2023-02-21T13:36:00+01:00
Description: Good afternoon. I have a led lamp with a bk7321 processor and a sht30 sensor on my hands. I don't need it as a lamp, but I need it as a temperature and humidity meter. What firmware do I need to upload to it? To implement this. Sorry for my english, I'm from Ukraine. Thank you

@yuretskor you can easily configure LED first, I don't think anything is broken. Have you tried configuring PWM roles for IO of the WiFi module? Set PWM with channel 0 for P6, with channel 1 for P24, and with channel 2 for P26.

>>20453752 For the SHT you got a correct script. You just need to write this script in white webapp/littlefs tab. You can access the white webapp from the main menu of the device. There's a button In this mode you can test command in panel logs and write script in filesystem tab Once you are satisfied with your script you can put it as start command.

@yuretskor enable that in flags: then, assuming you have latest version, in Launch Web Application set channel types; for temperature (channel 0) set Temperature_Div10, for humidity (1) set humidity:

@yuretskor , flash it with OpenBeken, I can help you and guide step by step, but it would be very helpful if you posted detailed photos and model number of your device.

I have such a module with a lamp. I did not take pictures of the module with LEDs. Thank you for reaching out to help. Tell me how to determine where to connect for the firmware, also the module needs to be soldered?

if you don't want to bother with the led module i agree with @p.kaczmarek2 you can totally desolder the beken module and take example of the cbu schema to rely on a different alimentation (battery or usb) .... as 220 to 3,3V alim can impact measurement of SHT : with p24/P26 for sda and scl the alert is not necessary if you don't want to use it.

Kind. I did everything according to the instructions. And I managed to flash it, I saw the access point, went into the settings, registered my point and password. Reloaded the module and now I can't find it. I did the firmware on a new one and now the access point does not appear. The first time was like that. After that, the whole module was lost.

>>20452608 After you configure your wifi endpoint the ip of your device changed. You need to check on your routeur which ip is assigned to your device (hostname will begin with opk.....)

You can also use the IP scanner tool and just let it iterate over your network. And if you want a static IP, you can do MAC reservation on your router.

The module is working. It did not work because there is no antenna and the access point is far away. Brought closer and everything is ok. Now tell me where to connect sht30 and if it is possible for the led backlight control to work? Thank you

Led backlight? So you want to keep LED functionality working? Well, in that case, you might be able to reuse the TX1 and RX1 port as a software I2C port for SH30. Maybe... I haven't tried that. You'd have to try.

Now I need to solder the module back. How to understand on which contacts the LED module works? Added after 2 [hours] 15 [minutes]: Achieved stable operation of the module. I connect the sht30 sensor to vdd-vdd, grn-grn, sda-sda(pin rx uart1), scl-scl (pin tx uart1) . I make pin settings via the web. No data. Is there anything else you need to do to get the job done?

[BK7231T/WBLC5] How to attach SHT30 sensor to smart Tuya LED?

yuretskor 9576 97

Best answers

How do I flash and configure a BK7231/WBLC5 Tuya LED lamp with an SHT30 so it works as a temperature and humidity meter?

Flash it with OpenBeken; the advice was to first back up the original firmware with BK7231GUIFlashTool, then write the BK7231T OpenBeken build over UART1 after soldering GND, 3.3 V, RX and TX [#20450395][#20450565] For the SHT30, start the SHT3X driver and use an autoexec script such as `startDriver SHT3X`, `setChannelType 0 Temperature_div10`, `setChannelType 1 Humidity`, and `addRepeatingEvent 5 -1 SHT_Measure`; if you want regular MQTT updates, add `mqtt_broadcastInterval 5` [#20454182][#20454498][#20455491] The sensor can be connected on the available pins, and if you keep the LED driver too, the thread later found a soft-I2C conflict that was fixed in a newer firmware build [#20459181][#20459212][#20459538] After updating, the combined LED + SHT30 setup worked, and moving the sensor to unused channels 10 and 11 solved the channel-clash/MQTT issues [#20458931][#20459873]

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#1 20450321 21 Feb 2023 11:34

yuretskor yuretskor

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Post #1
20450321 21 Feb 2023 11:34

Good afternoon. I have a led lamp with a bk7321 processor and a sht30 sensor on my hands. I don't need it as a lamp, but I need it as a temperature and humidity meter. What firmware do I need to upload to it? To implement this. Sorry for my english, I'm from Ukraine. Thank you

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#2 20450395 21 Feb 2023 12:05

p.kaczmarek2 p.kaczmarek2

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Post #2
20450395 21 Feb 2023 12:05

@yuretskor , flash it with OpenBeken, I can help you and guide step by step, but it would be very helpful if you posted detailed photos and model number of your device.

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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#3 20450513 21 Feb 2023 13:08

yuretskor yuretskor

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Post #3
20450513 21 Feb 2023 13:08

I have such a module with a lamp. I did not take pictures of the module with LEDs. Thank you for reaching out to help. Tell me how to determine where to connect for the firmware,
also the module needs to be soldered?
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#4 20450565 21 Feb 2023 13:36

p.kaczmarek2 p.kaczmarek2

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Post #4

20450565 21 Feb 2023 13:36

I have split your posts from here:
[BK7231N CBU] Generic Temperature and Humidity Sensor
as they deserve a separate topic.
Ok, so please consult this topic:
BK7231 datasheet, pinout, programming, specification, wiki (BK7231T, BK7231N)
You have WBLC5 module:

You don't have much choice when it comes to IO pins:

Pin No.	Symbol	I/O type	Function
1	ANT	O	External antenna pad pin
2	GND	P	Ground pin
3	PWM4	I/O	Hardware PWM pin, which is connected to the P24 pin on the internal IC
4	PWM5	I/O	Hardware PWM pin, which is connected to the P26 pin on the internal IC
5	PWM0	I/O	Hardware PWM pin, which is connected to the P6 pin on the internal IC
6	VCC	P	Power supply pin (3.3 V)

P6, P24, P26... you will need to use one of those pins.
The programming port is UART1:

You can use method like here:

The flasher is here:
https://github.com/openshwprojects/BK7231GUIFlashTool
Make sure to first read firmware and provide us a backup for analysis (it always helps).

To make it simpler for you, I will write here a short brief description what you need to do:
1. read and consult materials here
2. get USB to uart converter
3. get BK7231 easy flasher as linked here
4. get 3.3V power supply (do not power bulb from mains!)
5. solder GND, 3.3V, RX and TX for wifi module
6. in flasher, start "Backup firmware (read)"
7. while flasher is waiting for "getting bus", reattach 3.3V (power off/on cycle module)
8. get firmware backup, send it to us
9. then do firmware write with OpenBeken for BK7231T (the Easy Flasher can download proper firmware automatically)
10. then make sure AP appears, make sure that OBK works, etc, open page at 192.168.4.1 etc just like Tasmota, configure your SSID
11. finally, connect SHT sensor to available pins and set the pin roles on OBK web page

It may sound complicated at first, but really, it's very easy, it's like 15 minutes job if you have all parts, but of course you will have to solder wires, etc...
You can watch also this video:

but it's for BK7231N and not BK7231T

Your module can work outside the LED PCB if you want, it just needs GND and 3.3V, but you can keep it on LED board and power it from there but of course not during programming from PC!

Do you want to keep LED function or totally convert it to SHT30 sensor?

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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#5 20451573 21 Feb 2023 21:57

dheenhasty dheenhasty

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Post #5
20451573 21 Feb 2023 21:57

if you don't want to bother with the led module i agree with @p.kaczmarek2 you can totally desolder the beken module and take example of the cbu schema to rely on a different alimentation (battery or usb) .... as 220 to 3,3V alim can impact measurement of SHT :

https://obrazki.elektroda.pl/9879827700_1673859980.png

with p24/P26 for sda and scl the alert is not necessary if you don't want to use it.
#6 20452608 22 Feb 2023 15:38

yuretskor yuretskor

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Post #6
20452608 22 Feb 2023 15:38

Kind. I did everything according to the instructions. And I managed to flash it, I saw the access point, went into the settings, registered my point and password. Reloaded the module and now I can't find it. I did the firmware on a new one and now the access point does not appear. The first time was like that. After that, the whole module was lost.
#7 20452636 22 Feb 2023 15:55

dheenhasty dheenhasty

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Post #7
20452636 22 Feb 2023 15:55

>>20452608

After you configure your wifi endpoint the ip of your device changed. You need to check on your routeur which ip is assigned to your device (hostname will begin with opk.....)
#8 20452644 22 Feb 2023 15:59

p.kaczmarek2 p.kaczmarek2

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Post #8
20452644 22 Feb 2023 15:59

You can also use the IP scanner tool and just let it iterate over your network. And if you want a static IP, you can do MAC reservation on your router.

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.
#9 20452681 22 Feb 2023 16:17

yuretskor yuretskor

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Post #9
20452681 22 Feb 2023 16:17

The module is working. It did not work because there is no antenna and the access point is far away. Brought closer and everything is ok.
Now tell me where to connect sht30 and if it is possible for the led backlight control to work? Thank you
#10 20452701 22 Feb 2023 16:28

p.kaczmarek2 p.kaczmarek2

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Post #10
20452701 22 Feb 2023 16:28

Led backlight? So you want to keep LED functionality working?

Well, in that case, you might be able to reuse the TX1 and RX1 port as a software I2C port for SH30. Maybe... I haven't tried that. You'd have to try.

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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#11 20452963 22 Feb 2023 18:49

yuretskor yuretskor

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Post #11
20452963 22 Feb 2023 18:49

Now I need to solder the module back. How to understand on which contacts the LED module works?

Added after 2 [hours] 15 [minutes]:

Achieved stable operation of the module. I connect the sht30 sensor to vdd-vdd, grn-grn, sda-sda(pin rx uart1), scl-scl (pin tx uart1) . I make pin settings via the web. No data. Is there anything else you need to do to get the job done?
#12 20453219 22 Feb 2023 20:37

dheenhasty dheenhasty

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20453219 22 Feb 2023 20:37

>>20452963

Yes starting the driver, and launch a measurement on a script of thru logs panel on webapp

You can find how to do all that in tutorial section.
#13 20453678 23 Feb 2023 07:28

yuretskor yuretskor

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Post #13
20453678 23 Feb 2023 07:28

As I understand it, I need to register the following command, where to register it?

PowerSave
echo "activate SHT3X Sensor"
startDriver SHT3X

:loop
SHT_Measure
delay_s 300
goto loop
#14 20453685 23 Feb 2023 07:36

dheenhasty dheenhasty

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20453685 23 Feb 2023 07:36

>>20453678

You can find detail littlefs management and script (autoexec.bat) on wiki.

https://github.com/openshwprojects/OpenBK7231T_App/wiki/Wiki-Home
#15 20453730 23 Feb 2023 08:18

yuretskor yuretskor

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Post #15
20453730 23 Feb 2023 08:18

I can not find and understand what I need to read and enter. Maybe there is a video on setting up sht30 or maybe someone can do it. Thank you It's a pity the module broke and the led does not work and there is no temperature (
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#16 20453748 23 Feb 2023 08:31

p.kaczmarek2 p.kaczmarek2

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Post #16
20453748 23 Feb 2023 08:31

@yuretskor you can easily configure LED first, I don't think anything is broken. Have you tried configuring PWM roles for IO of the WiFi module?

Set PWM with channel 0 for P6, with channel 1 for P24, and with channel 2 for P26.

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.
#17 20453752 23 Feb 2023 08:35

yuretskor yuretskor

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Post #17
20453752 23 Feb 2023 08:35

For input output I use pins Rx1, Tx1 for sht30. Well, I’ll deal with the ice module right away.
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#18 20453785 23 Feb 2023 09:03

dheenhasty dheenhasty

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Post #18
20453785 23 Feb 2023 09:03

>>20453752

For the SHT you got a correct script.

You just need to write this script in white webapp/littlefs tab.

You can access the white webapp from the main menu of the device. There's a button

In this mode you can test command in panel "logs" and write script in "filesystem" tab

Once you are satisfied with your script you can put it as start command.
#19 20453801 23 Feb 2023 12:24

yuretskor yuretskor

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Post #19
20453801 23 Feb 2023 12:24

Will it work on Rx Tx?

Added after 2 [hours] 43 [minutes]:

With the help of the script, below came out to get the readings. Only it works while I send the command. How can I make measurements automatically every 1 second when power is applied?

Code: text Expand Select all Copy to clipboard
PowerSave echo "activate SHT3X Sensor" startDriver SHT3X :loop SHT_Measure delay_s 1 goto loop

Added after 22 [minutes]:

This is how it is now displayed, while I press "save, run file as ... " then the data is updated, no further.
#20 20454144 23 Feb 2023 13:06

p.kaczmarek2 p.kaczmarek2

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20454144 23 Feb 2023 13:06

Maybe just use addRepeatingEvent instead of trying to write loop? Your syntax of label seems incorrect, and furthermore autoexec is run in place and not executed as script, hmm.... but you can peek here:
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/src/selftest/selftest_script.c
Repeating event is simpler...
https://github.com/openshwprojects/OpenBK7231.../main/src/selftest/selftest_repeatingEvents.c

Btw, @dheenhasty , wouldn't it be easier for future users to just enable automatic measure per default? I think current approach is wrong, it costs nothing to do a measurement...

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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#21 20454171 23 Feb 2023 13:18

yuretskor yuretskor

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Post #21
20454171 23 Feb 2023 13:18

My programming knowledge is "0". Thanks for the links, but I don't understand them. I agree with you that the readings should be measured automatically, and not program another code. Since it was done on hard firmware. I'll wait for a normal firmware, and I'll throw it all in the box, since my knowledge is not enough. And I just wanted to measure the temperature and send it via MQTT. Thank you all, hands down, it's very difficult for me
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#22 20454182 23 Feb 2023 13:25

p.kaczmarek2 p.kaczmarek2

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Post #22
20454182 23 Feb 2023 13:25

Well, all you need to do is:
Code: text Expand Select all Copy to clipboard
PowerSave echo "activate SHT3X Sensor" startDriver SHT3X addRepeatingEvent 10 -1 SHT_Measure

And this should work, repeating measurement every 10 seconds, forever.

I think that we will soon change the logic to do a SHT_Measure automatically (make automatic measurement enabled by default, @dheenhasty , and let user override it and set manual mode? So it works without any scripting?)

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.

#23 20454228 23 Feb 2023 14:03

yuretskor yuretskor

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Post #23

20454228 23 Feb 2023 14:03

Thanks It works. A little more and I will leave you behind, and you will forget me like a bad dream.
Now how can I get this data via MQTT if I have the following settings and the part with Log

Info:GEN:No change in channel 0 (still set to 222) - ignoring

Info:GEN:No change in channel 1 (still set to 58) - ignoring

Info:SENSOR:SHT3X_Measure: Temperature:22.289615C Humidity:58.985275%
Info:MAIN:Time 60, idle 51296/s, free 88560, MQTT 1(1), bWifi 1, secondsWithNoPing -1, socks 2/38 POWERSAVE
Info:GEN:dhcp=0 ip=192.168.0.104 gate=192.168.0.1 mask=255.255.255.0 mac=c8:47:8c:00:00:00 
Info:GEN:sta: 1, softap: 0, b/g/n
Info:GEN:sta:rssi=-75,ssid=K.Y.A,bssid=e8:94:f6:3a:e5:b4 ,channel=4,cipher_type:CCMP
Info:MAIN:Time 61, idle 59074/s, free 88560, MQTT 1(1), bWifi 1, secondsWithNoPing -1, socks 2/38 POWERSAVE
Info:MAIN:Time 62, idle 56458/s, free 88560, MQTT 1(1), bWifi 1, secondsWithNoPing -1, socks 2/38 POWERSAVE
Info:MAIN:Time 63, idle 56747/s, free 88560, MQTT 1(1), bWifi 1, secondsWithNoPing -1, socks 2/38 POWERSAVE
Info:MAIN:Time 64, idle 54615/s, free 79936, MQTT 1(1), bWifi 1, secondsWithNoPing -1, socks 3/38 POWERSAVE
Info:GEN:No change in channel 0 (still set to 222) - ignoring

#24 20454237 23 Feb 2023 14:08

p.kaczmarek2 p.kaczmarek2

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20454237 23 Feb 2023 14:08

Better stay with us on the forum, we are happy to help.

So, maybe let's start with it - what is your status here, has the MQTT connection succeed?

Btw you have 00000s in MAC, you might want to fix it in Open Web Application -> Flash -> restore RF partition..

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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#25 20454243 23 Feb 2023 14:12

yuretskor yuretskor

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Post #25
20454243 23 Feb 2023 14:12

>>20454237 @p.kaczmarek2 Yes, there is a connection. What does 00000 in a MAC address do?
#26 20454271 23 Feb 2023 14:27

p.kaczmarek2 p.kaczmarek2

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Post #26
20454271 23 Feb 2023 14:27

You might have accidentally erased your MAC, this is why here is 00:00:00:

Not a problem, it's easy to fix as I said.

Is your MQTT server a Home Assistant?

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.
#27 20454302 23 Feb 2023 15:51

yuretskor yuretskor

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Post #27
20454302 23 Feb 2023 15:51

No, this is not Home Assistant. I need to get data separately 22.2 is one topic 58.7 is another topic. Is it possible? I need a direct link to a topic like
rule1ds1egor/tasmota_fd09d1/SENSOR

Added after 1 [hours]:

I understand the topic should be obc8C000000/channel1/get
? But there's nothing there
#28 20454488 23 Feb 2023 16:26

dheenhasty dheenhasty

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20454488 23 Feb 2023 16:26

p.kaczmarek2 wrote:
I think that we will soon change the logic to do a SHT_Measure automatically (make automatic measurement enabled by default, @dheenhasty , and let user override it and set manual mode? So it works without any scripting?)

Yes was thinking of it. I need to detect if per is activated
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#29 20454498 23 Feb 2023 16:35

p.kaczmarek2 p.kaczmarek2

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Post #29
20454498 23 Feb 2023 16:35

@yuretskor enable that in flags:

then, assuming you have latest version, in Launch Web Application set channel types; for temperature (channel 0) set Temperature_Div10, for humidity (1) set humidity:

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.
#30 20454637 24 Feb 2023 07:17

yuretskor yuretskor

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Post #30
20454637 24 Feb 2023 07:17

@p.kaczmarek2 thanks, it worked. But there is a BIG BUT:
1. data via mqtt can only be received until the module is rebooted, after rebooting it is necessary to enter the channel type again, for some reason they are not saved.
2. if the data on the channels does not change and has one value, then mqtt displays an error, this is very visible in humidity, since there is rounding to an integer and it does not change so quickly, it is less in temperature, there is rounding to hundredths of 0.1 and there are fewer errors, although they also exist.
How can these problems be solved?
Thanks to everyone for the help, to be honest, I don’t understand how someone can think of what needs to be changed in the flag settings, only the developer

Added after 38 [minutes]:

A quick solution to the problem is to make the same bit depth for humidity as for temperature. How to do?
Or maybe there is a flag for such purposes?
I am close to solving my problems

Added after 9 [minutes]:

in Log writes
Code: text Expand Select all Copy to clipboard
Info:GEN:No change in channel 1 (still set to 58) - ignoring

How to remove this function that always published the value?

Added after 43 [minutes]:

I need the data every 5 minutes to send to the server. Below is a screen on which the red line sends data without gaps (temperature from another module), the white temperature with bk7231t sht30 sometimes has a gap every 10 minutes, and the blue line is humidity, it can be seen that the data came very few times due to the fact that humidity changes much less frequently than temperature and rounding to the nearest whole number. The temperature rounds up to 0.001 everything is fine. Also, after all, the type of flags was preserved, perhaps there was some kind of glitch. Like this (

Added after 11 [hours] 25 [minutes]:

The guys are really bad with the data. There is a module on esp8266 with Tasmota firmware that works on the same server, only sends data to the mqtt topic according to the rule. And there is no problem with passes.
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✨ The discussion focuses on integrating an SHT30 temperature and humidity sensor with a smart Tuya LED lamp module based on the BK7231T processor, specifically the WBLC5 module. The user seeks firmware and configuration guidance to repurpose the lamp as a temperature and humidity meter. The OpenBeken firmware is recommended, with detailed instructions on flashing, pin assignments (notably PWM0/P6, PWM4/P24, PWM5/P26 for I2C and LED control), and UART1 usage for programming. The SHT30 sensor is connected via software I2C on UART1 pins (Rx1/Tx1), requiring driver activation and scripting in the device's web interface (autoexec.bat or LittleFS scripts) to initiate periodic measurements. MQTT integration is addressed, including channel type settings, data publishing intervals, and troubleshooting MAC address issues. LED control uses the SM2135 LED driver with RGBCW channels over I2C (SDA on PWM4/P24, SCL on PWM5/P26), with commands for color mapping and brightness adjustment. Conflicts between LED and sensor I2C usage due to shared global variables were identified and resolved in firmware updates. The TM1637 4-digit display support was developed and integrated, allowing cyclic display of time, temperature, and humidity via scripting. Challenges with channel persistence after reboot, MQTT data resolution, and Android browser compatibility for color control were discussed and addressed through firmware updates. The conversation includes advanced scripting examples for event handling, channel mapping, and MQTT broadcast tuning. The user also encountered difficulties with TM1637 digit order and firmware compilation, receiving guidance and precompiled firmware with TM1637 support. Overall, the thread provides a comprehensive technical roadmap for customizing BK7231T-based Tuya LED modules with SHT30 sensors, LED color control, MQTT telemetry, and TM1637 display integration using OpenBeken firmware and scripting.
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[BK7231T/WBLC5] How to attach SHT30 sensor to smart Tuya LED?

FAQ

TL;DR: Flashing a WBLC5 (BK7231T) with OpenBeken takes about 15 minutes; “it’s very easy, it’s like 15 minutes job” [Elektroda, p.kaczmarek2, post #20450565] The SHT30 delivers ±0.2 °C accuracy and ±2 % RH [Sensirion DS, 2022]. Why it matters: one module lets you log temperature, humidity and drive RGB-CW LEDs over MQTT without Tuya cloud.

Quick Facts

• BK7231T UART1 pins = 3.3 V, GND, P24 (RX1), P26 (TX1) [Elektroda, p.kaczmarek2, post #20450565] • SHT30 supply: 2.4–5.5 V, 150 µA active, 0.5 µA sleep [Sensirion DS, 2022] • OpenBeken build ≥ 1.15.507 fixes I²C LED/SHT conflict [Elektroda, p.kaczmarek2, post #20459538] • SM2135 LED driver current default 10 mA per channel [Elektroda, p.kaczmarek2, post #20457907] • MQTT broadcast period set by mqtt_broadcastInterval SECONDS (range 1–86400) [OpenBeken Docs]

What firmware should I flash to a WBLC5/BK7231T to read an SHT30 sensor?

Use the current OpenBeken build for BK7231T. The easy flasher can download the correct binary automatically and backs up the factory image first [Elektroda, p.kaczmarek2, post #20450565]

How do I connect the module for flashing without powering the mains LED board?

Solder 3.3 V, GND, RX1 (P24) and TX1 (P26) to a USB-UART adapter.
Start “Backup firmware (read)” in BK7231 GUI Flash Tool.
Power-cycle the module to enter bootloader, finish read, then write OpenBeken [Elektroda, p.kaczmarek2, post #20450565]

Which GPIO pins can I use for SHT30 SDA and SCL on a WBLC5?

Free pins are P6, P24 and P26. Most users place SDA on P24 (RX1) and SCL on P26 (TX1). Software I²C works on any of them after setting pin roles in the web UI [Elektroda, p.kaczmarek2, post #20452701]

Can I keep full LED functionality while running the SHT30?

Yes. Map SDA/SCL to UART1 pins for SHT30 and keep PWM4/PWM5 driving the SM2135 LED chip. Firmware ≥ 1.15.499 fixed the I²C conflict; update if LEDs go dark after sensor reads [Elektroda, p.kaczmarek2, post #20459181]

After entering Wi-Fi credentials the access point vanished—how do I find the module?

Once the device joins your WLAN it gets a new IP via DHCP. Scan your network or check the router for a hostname beginning with “obk…” [Elektroda, dheenhasty, post #20452636]

I wired the SHT30 but see no readings. What else is required?

Start the driver and schedule measurements:


startDriver SHT3X
addRepeatingEvent 10 -1 SHT_Measure

Save these lines in autoexec.bat or the LittleFS editor, then reboot [Elektroda, p.kaczmarek2, post #20454182]

How do I make OpenBeken publish MQTT data every 60 s even when values don’t change?

Set persistent interval broadcasting:


mqtt_broadcastInterval 60
mqtt_broadcastItemsPerSec 2

This forces a publish every 60 s per channel whether or not the reading changed [Elektroda, p.kaczmarek2, post #20455491]

My LEDs stopped responding after I added the sensor—what’s the fix?

Update to firmware ≥ 1.15.507, which separates I²C pin instances. Earlier builds overwrote LED SDA/SCL with SHT values, disabling SM2135 output [Elektroda, p.kaczmarek2, post #20459538]

LED colours are swapped; how do I remap SM2135 channels?

Run SM2135_Map r g b c w, replacing each letter with the desired index (0–4). Example for RGB-CW order:


SM2135_Map 1 0 2 4 3

No reboot required; move any slider to view the change [Elektroda, yuretskor, post #20458108]

Edge-case: MQTT stops when temperature and humidity stay constant—why?

OpenBeken suppresses MQTT messages if No change in channel to save bandwidth [Elektroda, yuretskor, post #20454637] Override by lowering mqtt_broadcastInterval or forcing repeating events to push unchanged data.

Is TM1637 display supported and how do I wire it?

Support is merged; flash a build with #define USE_TM1637. Assign DIO and CLK pins in Web App, then print:


TM1637_Print 0 0 $CH10 ;temperature

Use TMGN_Map to correct digit order if needed [Elektroda, p.kaczmarek2, post #21205344]

What if TM1637 digits appear out of order?

Send different TMGN_Map permutations until TMGN_Print 0 0 1234 shows 1234. Typical common-anode modules use TMGN_Map 32104567 [Elektroda, p.kaczmarek2, post #21205344]

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