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[BK7231N/CB3S] Mhcozy TYWRA-RF Relay Module (Dry Contact) Configuration & Setup Guide

wassimsarghini 4182 17
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  • Hello everyone,

    First of all thanks to the community.

    I flashed a relay module (dry contact) that uses a CB3S chip

    Brand : Mhcozy
    Model : TYWRA-RF

    I just wanted to share with you the config, in order to save time

    Here is the config:

    [BK7231N/CB3S] Mhcozy TYWRA-RF Relay Module (Dry Contact) Configuration & Setup Guide

    Code: JSON
    Log in, to see the code


    hope this helps someone

    Greeting

    Cool? Ranking DIY
    About Author
    wassimsarghini
    Level 1  
    Offline 
    wassimsarghini wrote 1 posts with rating 3, helped 1 times. Been with us since 2023 year.
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  • #2 20801332
    xinetic
    Level 1  
    Yes thnx this wil help, but now it is just a wifi controlled relais, how can i learn a new RF remote control?
  • #3 21308294
    fitor
    Level 8  
    xinetic wrote:
    Yes thnx this wil help, but now it is just a wifi controlled relais, how can i learn a new RF remote control?


    Hi, did anyone solve this problem?
    Thanx
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  • #4 21308412
    divadiow
    Level 34  
    are you sure RF matching must be done through software? I notice the manual only makes mention of the app method, but my experience with the switches I have with RF capability is that a long-push of one of the button also does the same. Perhaps this is also true of this device?
    Attachments:
  • #5 21308431
    fitor
    Level 8  
    Hi, I have the instructions manual. But xinetic mentioned that the RF transmitter cannot be learned after flash, so far I relay not flash because I want to keep the RF function. I will try to pick up the Tuya config and will see.

    Dodano po 3 [godziny] 33 [minuty]:

    Hi, i made dump, the result is similar to that from wassimsarghini.
    Identifikation of ICs:
    MB10F rectifier
    XL1509  DC BUCK step-down
    RFE2740  ???
    ?? one without label
    Module: CB3S
    JSON+text:
    Code: text Expand Select all Copy to clipboard
    {
   "rl1_lv":"1",
   "on_off_cnt":"10",
   "onoff_rst_m":"0",
   "led1_pin":"9",
   "onoff_clear_t":"6",
   "rand_dpid":"42",
   "net_trig":"4",
   "netled1_lv":"0",
   "jv":"100",
   "onoff_rst_type":"2",
   "total_bt_pin":"6",
   "nety_led":"0",
   "total_stat":"0",
   "reset_t":"7",
   "netled1_pin":"8",
   "remote_add_dp":"49",
   "remote_list_dp":"50",
   "net_type":"0",
   "inch_dp":"44",
   "module":"CB3S",
   "ch_cddpid1":"9",
   "onoff1":"14",
   "init_conf":"38",
   "led1_lv":"0",
   "zero_select":"0",
   "onoff_type":"0",
   "series_ctrl":"0",
   "total_bt_lv":"0",
   "cyc_dpid":"43",
   "remote_select":"0",
   "ch_num":"1",
   "rl1_pin":"24",
   "netn_led":"0",
   "ch_dpid1":"1",
   "crc":"85"
}

Device configuration, as extracted from Tuya: 
- LED (channel 1) on P9
- Pair/Toggle All Button on P6
- WiFi LED on P8
- TglChannelToggle (channel 1) on P14
- Relay (channel 1) on P24
Device seems to be using CB3S module, which is using BK7231N.
And the Tuya section starts, as usual, at 2023424


    Could you confirm that this configuration enable RF code learning?
    Attachments:
  • #6 21309043
    fitor
    Level 8  
    I flashed the relay successfully, it connects to wifi but cannot connect to the web interface :-(
    It's there way to reach settings in another way?
  • #7 21311074
    fitor
    Level 8  
    Hi, does anyone have experience with this problem.
    The relay has an address assigned to it by the router, but i cannot connect to it after entering the address into the browser. I can change the parameters using UART, but I can't control the relay over wifi.
    Thank you
  • #8 21323485
    GastonL
    Level 4  
    Hi,

    I have the same smart switch. Can you tell me how you flashed it? Did you connect an uart/usb device, and if so, how did you wire it?
  • #9 21324150
    fitor
    Level 8  
    Hi, standard conection via UART, module CB3S:
    PIN1 - CEN
    PIN8 - Vcc
    PIN9 - GND
    PIN15 - RX
    PIN16 - TX
    Code: text Expand Select all Copy to clipboard
    
{
"rl1_lv":"1",
"on_off_cnt":"10",
"onoff_rst_m":"0",
"led1_pin":"9",
"onoff_clear_t":"6",
"rand_dpid":"42",
"net_trig":"4",
"netled1_lv":"0",
"jv":"100",
"onoff_rst_type":"2",
"total_bt_pin":"6",
"nety_led":"0",
"total_stat":"0",
"reset_t":"5",
"netled1_pin":"8",
"remote_add_dp":"49",
"remote_list_dp":"50",
"net_type":"0",
"inch_dp":"44",
"rf_width":"345",
"module":"CB3S",
"ch_cddpid1":"9",
"remote_io":"26",
"onoff1":"14",
"init_conf":"38",
"led1_lv":"0",
"zero_select":"0",
"onoff_type":"0",
"series_ctrl":"0",
"total_bt_lv":"0",
"cyc_dpid":"43",
"remote_select":"1",
"ch_num":"1",
"rl1_pin":"24",
"netn_led":"0",
"ch_dpid1":"1",
"crc":"16"
}

Device configuration, as extracted from Tuya:
- LED (channel 1) on P9
- Pair/Toggle All Button on P6
- WiFi LED on P8
- TglChannelToggle (channel 1) on P14
- Relay (channel 1) on P24
Device seems to be using CB3S module, which is using BK7231N.
And the Tuya section starts, as usual, at 2023424
    [/code]

    but be careful, out of 4 relays one is not working RF, like in the second post!!
  • #10 21324278
    GastonL
    Level 4  
    That's how I connected it, but I did not unsoldier the cb3s. I tried to reset through pin 1 (reset) and pin 3 (cen), but without luck.

    Do I have to unsoldier the cb3s for that? I measured voltage over pin  8 and pin 9 after connecting gnd and 3v, but I measure only a 0.7v, so there is a huge voltage drop.
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  • #11 21324638
    fitor
    Level 8  
    That's weird. If you have a weak 3V3 power supply on the UART, you can use an external stabilizer.
    But the easiest way is to just connect Rx, Tx and GND and power the relay through its micro USB port.
    You connect the power then the UART, and briefly disconnect and reconnect the USB power when a reset is requested.
  • #12 21325559
    GastonL
    Level 4  
    Your suggestion did help me, but it works differently for me. Steps I did:
    1. wire TX, RX and GND
    2. connect USB/UART to computer
    3. start (windows) BK7231 UART flasher
    4. connect switch to USB for power
    5. shortly wire GND to pin 1 (RST)
    6. disconnect GND

    The results are as below

    note to me: don't swap TX and RX, because that leads to frying a SMD

    Unfortunately, I don't see it come up as an AP neither can I find it on my network when I add wifi credentials. Any flag box I should tick?

    Code: text Expand Select all Copy to clipboard
    
{
   "rl1_lv":"1",
   "on_off_cnt":"10",
   "onoff_rst_m":"0",
   "led1_pin":"9",
   "onoff_clear_t":"6",
   "rand_dpid":"42",
   "net_trig":"4",
   "netled1_lv":"0",
   "jv":"100",
   "onoff_rst_type":"2",
   "total_bt_pin":"6",
   "nety_led":"0",
   "total_stat":"0",
   "reset_t":"5",
   "netled1_pin":"8",
   "remote_add_dp":"49",
   "remote_list_dp":"50",
   "net_type":"0",
   "inch_dp":"44",
   "rf_width":"345",
   "module":"CB3S",
   "ch_cddpid1":"9",
   "remote_io":"26",
   "onoff1":"14",
   "init_conf":"38",
   "led1_lv":"0",
   "zero_select":"0",
   "onoff_type":"0",
   "series_ctrl":"0",
   "total_bt_lv":"0",
   "cyc_dpid":"43",
   "remote_select":"1",
   "ch_num":"1",
   "rl1_pin":"24",
   "netn_led":"0",
   "ch_dpid1":"1",
   "crc":"16"
}



Device configuration, as extracted from Tuya: 
- LED (channel 1) on P9
- Pair/Toggle All Button on P6
- WiFi LED on P8
- TglChannelToggle (channel 1) on P14
- Relay (channel 1) on P24
Device seems to be using CB3S module, which is using BK7231N.
And the Tuya section starts, as usual, at 2023424
  • #13 21325677
    fitor
    Level 8  
    After flash, choose Read only OBK config, then Change OBK settings and here put wifi SSID and password, then Write only OBK config. For wifi is not necesary to tick any flags.
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  • #14 21325907
    GastonL
    Level 4  
    That was easy, but I think I fried the AMS 1117 voltage regulator, because the led is on with a fast flicker, there is no WIFI and there is no response from buttons or relay (the AMS started smoking when I had TX-TX and RX-RX connected).

    So that was it I guess, unless I have a AMS somewhere and that's the only defect component.
  • #15 21325924
    fitor
    Level 8  
    Swapping Tx and Rx will not destroy the chip. You must have switched the polarity of the power supply.
  • #16 21327020
    GastonL
    Level 4  
    I agree that it's unlikely to destroy the chip with swapping Tx and Rx. But it's also unlikely to swap polarity using a USB cable to power the switch. I found a AMS1117 on a step down converter and tried to replace it, but that didn't end well. This project stops for me now. It was fun, but I am going to buy a zigbee switch as a replacement now.
  • #17 21327112
    fitor
    Level 8  
    Didn't you use a 5V power supply instead of 3V3?
  • #18 21327132
    GastonL
    Level 4  
    I used the uart on 3v and the USB is the regular way to power the switch (which is 5v of course). Apart from Tx and Rx I don't think anything was connected wrong. But we will never be sure
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Topic summary

The discussion centers around the configuration and setup of the Mhcozy TYWRA-RF relay module, which utilizes the BK7231N chip and is based on the CB3S board. A user shared their configuration details, including vendor information, keywords related to the device, and pin assignments. The user also provided links to images and a wiki for further reference. Another participant expressed gratitude for the shared configuration but inquired about learning to pair a new RF remote control with the relay module.
Summary generated by the language model.
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