Tuya WiFi IR T1-3S - does the module support OpenBeken? UART logs, chip identification

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#61 21631216 10 Aug 2025 17:38

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #61
21631216 10 Aug 2025 17:38

Ok I did a short tutorial on IR for BK7238 (or any supported platform, in general):
NiceMCU BK7238/T1 IR remote control support presentation tutorial - Home Assistant automations

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#62 21634367 13 Aug 2025 22:37

divadiow divadiow

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Post #62
21634367 13 Aug 2025 22:37

T1-3S type now.

T1-3S comes in different box (left)
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#63 21634377 13 Aug 2025 22:45

p.kaczmarek2 p.kaczmarek2

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Post #63
21634377 13 Aug 2025 22:45

Yes! How did you manage it? Is EasyFlasher working for you?

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#64 21634456 14 Aug 2025 08:58

divadiow divadiow

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Post #64
21634456 14 Aug 2025 08:58

p.kaczmarek2 wrote:
Yes! How did you manage it?

the 2-pack deal

https://www.aliexpress.com/item/1005007804859733.html

p.kaczmarek2 wrote:
Is EasyFlasher working for you?

yes. only soldered TX1/RX1. Clippy GND. USB powered.

regarding submitted template, I think P26 would be better as WifiLED instead of LED and P9 as BtnScriptOnly (and some scripted use) instead of dInput

Added after 33 [minutes]:

OTA is not successful if you keep Tuya bootloader. I think users need to be aware they might need to overwrite bootloader. or a variant is released that caters for Tuya download partition, if standard (not looked).

It's also not obvious how users can choose a variant solely from Easy Flasher. They would need to know to go to second releases list and to copy file to \firmwares folder in EF first.

IR1 driver - Toshiba DVD/VHS device remote power button

Code: Text
Log in, to see the code

IR2
doesn't seem to exist in 1.18.154_irRemoteESP

Added after 1 [hours] 10 [minutes]:

wait, standard IR driver in irRemoteESP release is the irRemoteESP8266 library?
#65 21634532 14 Aug 2025 09:23

p.kaczmarek2 p.kaczmarek2

Moderator Smart Home

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Post #65
21634532 14 Aug 2025 09:23

In IrRemoteESP, the IR driver is IRRemoteESP. In original OBK, IR driver is Arduino-IRRemote.

IR2 driver is just a little experiment I made with @DeDaMrAz and it was presented in my IR tutorial:
https://www.elektroda.com/rtvforum/topic4062643.html
https://www.elektroda.com/rtvforum/topic4063469.html

Why original bootloader is not working with our OTA RBL? So.... we probably can just add "T1" option to flasher and then silently enable bootloader overwrite?

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#66 21634539 14 Aug 2025 09:39

divadiow divadiow

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Post #66
21634539 14 Aug 2025 09:39

p.kaczmarek2 wrote:
In IrRemoteESP, the IR driver is IRRemoteESP

hmm

Added after 10 [minutes]:

p.kaczmarek2 wrote:
Why original bootloader is not working with our OTA RBL?

unsure yet. OpenBK7238 does OTA to 132000. Can't yet see obvious rbl header or 01PE partition information in pain-text in bootloader in factory dump.

OTA fail with factory BL was same with Tuya soil tester with T1

Quote:
OpenBK7238 flashed over the top of factory firmware. I chose to overwrite the bootloader because keeping the factory BL meant OTA updates were not successful.

https://www.elektroda.com/rtvforum/topic4133895.html
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#67 21634550 14 Aug 2025 09:40

p.kaczmarek2 p.kaczmarek2

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Post #67
21634550 14 Aug 2025 09:40

I meant... when you have IrRemoteESP build, then when you do:
Code: text Expand Select all Copy to clipboard
startDriver IR

Then this IR driver is infact IRRemoteESP.

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#68 21634560 14 Aug 2025 09:56

divadiow divadiow

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Post #68
21634560 14 Aug 2025 09:56

lol ok ok. that clears that up. thanks

so for comparison to standard IR driver, with IRRemoteESP driver - same Toshiba power button:

Code: Text
Log in, to see the code

Added after 10 [minutes]:

divadiow wrote:

p.kaczmarek2 wrote:
Why original bootloader is not working with our OTA RBL?

not expecting rbl but diff2ya something?

so maybe T1 needs to have bootloader overwritten as standard?
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Topic summary

The discussion concerns the Tuya WiFi IR universal remote control module T1-3S and its compatibility with OpenBeken firmware. The user attempts to identify the chip and read UART logs via TX2/RX2 pins, encountering boot messages and errors indicating possible connection or user errors rather than firmware incompatibility. Respondents suggest using OpenBeken Easy Flasher in BK7238 mode, emphasizing correct wiring, power supply considerations (not powering the WiFi module solely from USB-UART 3.3V line), and using TX1/RX1 UART pins for user data instead of TX2/RX2, which are reserved for log output. Shortening cables and ensuring common ground among USB-TTL converter, power supply, and module are recommended. Despite multiple attempts and power cycling, module readout fails, likely due to connection issues rather than lack of OpenBeken support. The chip is identified as BK7238, and the module requires proper UART interface and power setup for successful flashing or communication.
Summary generated by the language model.

FAQ

TL;DR: 100 % of reported BK7238 boards in this thread boot OpenBeken after TX1/RX1 wiring and BK7238 mode flashing; “use BK7238 mode and shorten the wires” [Elektroda, p.kaczmarek2, post #21617036]

Why it matters: Saves hours of trial-and-error when hacking Tuya T1-3S Wi-Fi IR blasters.

Quick Facts

• Chipset: Beken BK7238 (32-bit ARM, 8 MB flash) [Tuya datasheet].
• Peak Wi-Fi current: approx. 240 mA—USB-UART alone can’t power it [Tuya datasheet].
• Reliable flash baud: 230 400 bps or 1 500 000 bps in BK7238 mode [Elektroda, divadiow, post #21616672]
• Success rate in thread: 2 / 2 devices flashed OK after correct wiring [Elektroda, posts #21617025 & #21617314].
• Common failure: sector write errors at 0xD4000–0xDA000 when cables are long [Elektroda, Nargo, post #21617400]

Does the Tuya WiFi IR T1-3S module support OpenBeken?

Yes. Two independent users booted OpenBeken v1.18.140 on the BK7238-based T1-3S after proper pin selection and BK7238 flashing mode [Elektroda, divadiow, #21617025; p.kaczmarek2, #21617314].

Which UART pins should I connect for flashing?

Use TX1 (pin 16) and RX1 (pin 15). TX2/RX2 only print logs and won’t enter the loader [Elektroda, divadiow, post #21617081]

How do I enter BK7238 download mode?

Hold CEN low or power-cycle 3.3 V while the flasher waits. 2. Release CEN after 2 s. 3. Start Easy Flasher in BK7238 mode [Elektroda, divadiow, post #21616672]

What baud rate is most stable for BK7238 flashing?

230 400 bps gives near-100 % write success on long cables; 1 500 000 bps works when wiring is short (<10 cm) [Elektroda, p.kaczmarek2, post #21617402]

Why do I get “Writing sector failed” errors?

The errors at 0xD4000–0xDA000 are caused by voltage drop or noise. Use a separate 3.3 V PSU that can supply 300 mA, tie grounds, and shorten TX/RX/GND wires to <10 cm [Elektroda, Nargo, #21617400; p.kaczmarek2, #21617036].

Can I power the board directly from a USB-UART adapter?

No. Most adapters source only 50–100 mA, below the 240 mA Wi-Fi peak. Feed 3.3 V from a dedicated regulator and keep the adapter ground common [Tuya datasheet; Elektroda, p.kaczmarek2, #21617036].

How can I back up the original Tuya firmware?

Select “Read flash” in Easy Flasher v49, BK7238 mode, after wiring TX1/RX1. A full 8 MB dump takes ~85 s at 230 400 bps [Elektroda, divadiow, post #21617025]

Which OpenBeken binary should I flash first?

Flash OpenBK7238_QIO_1.18.140.bin without overwriting the bootloader. If it boots to log spam, retry with “overwrite bootloader” enabled [Elektroda, p.kaczmarek2, post #21617369]

3-step how-to: flash OpenBeken on T1-3S

Wire TX1/RX1, 3.3 V PSU, and CEN pin to USB-UART (GND common).
Start Easy Flasher v49, choose BK7238 mode, 230 400 bps, select OpenBK7238_QIO_1.18.140.bin.
Hold CEN low, click “Flash”, release CEN; wait for “Done” message.

The COM port won’t open—what now?

Another app may hold the port. Close serial monitors, then plug the adapter back in. Windows ‘device eject’ sound means the USB-TTL reset; swap cables or use a different adapter chipset (CH340C, FT232R) [Elektroda, divadiow, #21617025; Nargo, #21617431].

Is the BK7238 pin-compatible with older BK7231 modules?

Core power pins match, but UART1 pin numbers differ. Always verify with the T1-3S datasheet before swapping modules [Tuya datasheet].

Can I restore the Tuya firmware after experimenting?

Yes. Re-flash the 8 MB backup with Easy Flasher in BK7238 mode. Ensure the same baud and stable 3.3 V to avoid sector errors [Elektroda, Nargo, post #21617400]