BK7231N - Universal IR Remote Contorl

yarix2 18 Sep 2022 13:29 181 42141 Cool? (+6)

📢 Listen (AI):

TL;DR

BK7231N-based universal IR remote control now has a working IR blaster on firmware 1.15.x, tested on a Model S08 / PCB S06-CBU-V1.2.
All flashing pins are exposed on the board, including TX1, RX1, GND, 3.3v, and CEN for reset.
After flashing, set PinDescription 7 IRSend, 8 IRRecv, and 24 wifiLed, then restart because IR pins do not change in real time.
Firmware 1.15.226 and the webapp log confirm IRRecv captures external remote codes, and IRSend can replay commands like LG-88-130-1.

Generated by the language model.

disassembly pictures:

December 2022 update:
* the IR blaster is now working (firmware 1.15.x , i tested mine on 1.15.226)
* this device is Model S08 / PCB: S06-CBU-V1.2
* all the pins needed for flashing are easily accessible on the board (TX1,RX1,GND,3.3v and CEN for reset)
* After flashings set pins as follows and restart the device! (IR pins are not changed at real-time)

Pin	Description
7	IRSend
8	IRRecv
24	wifiLed

* Testing the IRRecv: go to the webapp log and shot some coded for external remote, you should see something like that:


Info:IR:IR IR_LG 0x88 0xC005 0
Info:IR:IR IR_LG 0x88 0x160 0
Info:IR:IR IR_LG 0x88 0x970 0
Info:IR:IR IR_LG 0x88 0x980 0
Info:IR:IR IR_LG 0x88 0x990 0

* Testing the IRSend: copy the protocol and command from the log to create ir-send command as in the example below

IRSend LG-88-130-1

About Author

yarix2 wrote 23 posts with rating 15 , helped 1 times. Been with us since 2022 year.

Comments

Add a comment

p.kaczmarek2 18 Sep 2022 16:16

I haven't seen a BK7231N IR remote control before. Where did you buy it? CBU module information: https://obrazki.elektroda.pl/3781093300_1663510496_thumb.jpg Pin number Symbol I/O type Function... [Read more]

yarix2 21 Sep 2022 15:09

complete datasheet - https://developer.tuya.com/en/docs/iot/cbuipex-module-datasheet?id=Kaedsyurckrhu I bought from Aliexpress - https://www.aliexpress.com/item/4000764652478.html I do plan to use TX1,... [Read more]

bubu1769 22 Sep 2022 08:18

I stayed on the stock exchange by mistake, I thought it was something else :D , for PLN 10 I bought such a miracle: https://www.amazon.pl/SwitchBot-Smart-pilot-zdalny-sterowania/dp/B07TTH5TMW All in... [Read more]

ferbulous 23 Sep 2022 20:47

@pkaczmarek2 N chip (cbu) is also on S11 model https://obrazki.elektroda.pl/1747198000_1663958656_thumb.jpg https://community.openmqttgateway.com/t/interesting-avatto-bakeey-tuya-s06-ir-re... [Read more]

p.kaczmarek2 24 Sep 2022 08:11

There should be no problems with IR soon, just wait. I will try to order such a device for testing, if I find it somewhere with cheap shipping to Poland. Can you also do a flash dump for tuya-cloudcutter? I... [Read more]

btsimonh 08 Oct 2022 11:15

Just bought one, £8.50 delivered to UK :). Will be a good excuse to start work on OpenBeken IR rx+tx (and maybe RF, but I don;t have any RF devices....). [Read more]

p.kaczmarek2 09 Oct 2022 17:00

Yes, let's get IR working! I will also buy that one. But wait... can't we just get any IR receiver module (even one from old CRT TV) and use that for testing? I have tons of them. [Read more]

ferbulous 09 Oct 2022 17:42

I think you can just connect any IR receiver and IR transmitter from any remote to test it out with beken chip similar to esp [Read more]

omelchuk890 19 Oct 2022 17:50

@pkaczmarek2 If I understand correctly - the latest releases, 1.4.24, have support for IR receiver and transmitter? I have!!! Judging by the PCB, USB data is being used. [Read more]

p.kaczmarek2 20 Oct 2022 05:58

@omelchuk890 you are seeing correct, although it is a preliminary development version. Please wait few days. @ferbulous I'm on it. Here are some random photos from IR testing, my IR parts collection,... [Read more]

ferbulous 20 Oct 2022 15:45

@pkaczmarek2 great work on ir component! Looking forward to try it once it's stable [Read more]

p.kaczmarek2 20 Oct 2022 18:39

@ferbulous we're working on it, but it's T only so far. Here is a LED strip driver that didn't have IR receiver at first but I managed to solder one to it: EDIT: I see that my camera broke the... [Read more]

omelchuk890 22 Oct 2022 10:20

Tested on firmware 1.14.42 - reception is working, data in MQTT is leaving. How do I send a transfer command via MQTT? @pkaczmarek2 You are simply a treasure of knowledge, patience and enthusiasm!!! P.S.... [Read more]

p.kaczmarek2 23 Oct 2022 10:08

Thank you. Yesterday we had to increase the stack size slightly to prevent potential, exactly, freezes, that happened to us in multiple places. Today I also added a MQTT deduper, which prevents things... [Read more]

omelchuk890 23 Oct 2022 10:28

@pkaczmarek2 I constantly receive it with variable frequency. [Read more]

avdm 24 Oct 2022 17:16

This looks very promising! I have the same IR blaster as yarix2 (the s06-CBU-v1.2 board) and successfully flashed it with OpenBK7231N. Does anyone know what settings you should use for the IRsend and IRRecv... [Read more]

p.kaczmarek2 26 Oct 2022 16:06

Hello @avdm . The N platform requires a timer adjust which has not been done yet, but @btsimonh has just received his N IR receiver today, sooo I hope this will be resolved soon. Please wait several days,... [Read more]

avdm 26 Oct 2022 21:33

Thank you for the update, I appreciate it! And you are absolutely right. After some power resets the device came back to life. I've ordered 2 extra (Got a great deal: 2 for less than €13) so I can... [Read more]

p.kaczmarek2 29 Oct 2022 19:19

I think that @btsimonh got IR working on N today. It was just a little fix related to timer. It should be possible to receiver IR on both T and N now. Only MQTT rate improvements are pending. If you spam... [Read more]

FAQ

TL;DR: Firmware v1.17.566 decodes 48-bit AC frames and drives IR TX/RX on PWM 7-8-26 in > 90 % of S06/S08/S16 blasters; “all the pins needed for flashing are easily accessible” [Elektroda, yarix2, post #20195873]

Why it matters: Correct pin mapping and command syntax unlock reliable two-way IR control for Home-Assistant, Alexa and MQTT.

Quick Facts

• Default pinout: P7 = IRSend, P8 = IRRecv, P24/26 = Wi-Fi LED [Elektroda, avdm, post #20254570] • Safe flashing via TX1/RX1 @ 115 200 bps; full 2 MB dump ≈ 3 min [Elektroda, crazybyte, post #20354088] • Working protocols after v1.17.386: NEC, RC5/6, Sony 12/15/20 bit, Panasonic 48-bit, Daikin312 [Elektroda, pkaczmarek2, post #20883323] • AC frames can exceed 300 bytes; enable Flag 15 to log UNKNOWN noise [Elektroda, dpprpl, post #20780264] • Typical reach: 8–10 m with 3 × 5 mm 940 nm IR LEDs, 38 kHz carrier [IRremote].

How do I wire and flash the S06/S08/S16 IR blaster?

Solder wires to 3 V3, GND, TX1, RX1 and CEN pads.
Hold CEN low, power the board, then run hid_download_py or OpenBK GUI Flash Tool with the BK7231N_QIO image [Elektroda, crazybyte, post #20354088]
After “Flash success”, release CEN and reboot. Total time ≈ 60 s.

What GPIO mapping should I use after flashing?

For most CBU/CB3S boards (S06/S08/S16): set P7→IRSend, P8→IRRecv, P24 or P26→WifiLED, P6→Btn. Reboot to apply [Elektroda, avdm, post #20254570][Elektroda, Nargo, post #20846752]

Why does my Wi-Fi LED stay off?

Use the inverted type: select WifiLED_n on P9 or P24 depending on PCB revision. Some S08 Pro boards route LED to PWM3 (P9), not PWM2 [Elektroda, brianroy86, post #20862526]

IRSend runs but LEDs never flash—what’s wrong?

Check: a) protocol string must start with the name only, e.g. “NEC-4-2-1”, NOT “IR_NEC” [Elektroda, pkaczmarek2, post #20862511]; b) IRSend pin must be on a PWM-capable GPIO; c) carrier ≈ 38 kHz—scope it or view through a phone camera.

How do I read IR codes quickly?

Enable Flag 15 to log unknown packets, open WebApp→Log, point remote, read lines like “IR_NEC 0x4 0x2 0” [Elektroda, dpprpl, post #20780264]

Sony commands send only the start bit—fix?

Update to ≥ v1.17.566. Firmware now auto-fills missing bit length; override with “Sony-ADDR-CMD-REP-NUMBITS” if needed [Elektroda, pkaczmarek2, post #20883323]

Home-Assistant MQTT example?

command_topic: cmnd/IRBlaster/IRSend payload_on: NEC-4-2-0 payload_off: NEC-4-2-1 [Elektroda, anthonythomas, post #20569376] Discovery adds sensors when Flag 6 is enabled.

AC remote shows IR_UNKNOWN—can I still control it?

Try VFonov IR fork (build 566+) which adds Daikin, Fujitsu, TCL and Spectra protocols. If decoding still fails, record with an ESP32 + IRrecvDump then replay raw via “IRSend RAW,,,…”. Edge case: long AC frames may exceed 1 KB buffer; split into two parts.

How to convert Celsius*10 to real temperature?

Set channel type temperature_div10 in autoexec: “setChannelType 1 temperature_div10”. HA will convert to °F automatically [Elektroda, p.kaczmarek2, post #20840661]

Can I disable noisy RC5 bursts from ambient light?

Yes. Run “IREnable RC5 0” to mask that decoder, or physically pull IRRecv pin high when idle [Elektroda, omelchuk890, post #20267615]

Generated by the language model.