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[RTL87X0C] Tuya EP2 Smart Plug - how to find BL0937 power pins?

me_lon 504 5
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  • Seeking BL0937 power-measurement pin assignments

    #1 21948489
    me_lon
    Level 2  
    Posts: 4
    Rate: 1
    Hey there,
    i found some used Smartplugs, where EP2 is written on it. They worked with Smart Life / Tuya and only one had v.1.0.4, all the others have 1.0.7. I managed to flash OpenRTL87X0C via tuya-cloudcutter OTA to the 1.0.4 Plug, for the v1.0.7 ones there was no Exploit. And i had no luck in soldering those small pads. 

    [RTL87X0C] Tuya EP2 Smart Plug - how to find BL0937 power pins?[RTL87X0C] Tuya EP2 Smart Plug - how to find BL0937 power pins?
    [RTL87X0C] Tuya EP2 Smart Plug - how to find BL0937 power pins? [RTL87X0C] Tuya EP2 Smart Plug - how to find BL0937 power pins?

    So far i could get REL, Btn and 2 LEDs to work. But how do i find the proper Pins for PowerMeassurement?
    The driver loads fine, but all the values stay at 0. I tried several combinations for BL0973CF, SEL, CF1 and also dInput CH 0 on all the other Pins, with no signal in the logs. 
    Am i doing something completely wrong? 

    There was a moment when i got some power stats, WITHOUT any pins assigned. 

    Code: text Expand Select all Copy to clipboard
    
{
  "vendor": "Tuya",
  "bDetailed": "0",
  "name": "Full Device Name Here",
  "model": "enter short model name here",
  "chip": "RTL87X0C",
  "board": "TODO",
  "flags": "1024",
  "keywords": [
    "TODO",
    "TODO",
    "TODO"
  ],
  "pins": {
    "1": "Rel;1",
    "12": "Btn;1",
    "17": "LED_n;1",
    "18": "LED_n;2"
  },
  "command": "startDriver BL0937",
  "image": "https://obrazki.elektroda.pl/YOUR_IMAGE.jpg",
  "wiki": "https://www.elektroda.com/rtvforum/topic_YOUR_TOPIC.html"
}

    AI: Can you post clear photos of both sides of the PCB, especially the RTL87X0C module area and the power-measurement chip area, including any chip markings / PCB revision text?
    the photos are in the post
    AI: Can you confirm the exact metering IC marking on the board — is it really BL0937, BL0942, BL0973 or something else — and did you trace which pins from that chip go to the RTL87X0C GPIOs?
    BL0937 is correct
    no i cannot trace them since i wasn't able to solder anything.

    Added after 2 [hours] 46 [minutes]:

    >>21948489

    I got it to work but my button doesn't recognize any input anymore, even if i set the previous settings.
    Here's the working template (button with same settings but not working, strange!!)

    Code: text Expand Select all Copy to clipboard
    
{
  "vendor": "Tuya",
  "bDetailed": "0",
  "name": "Full Device Name Here",
  "model": "enter short model name here",
  "chip": "RTL87X0C",
  "board": "TODO",
  "flags": "1024",
  "keywords": [
    "TODO",
    "TODO",
    "TODO"
  ],
  "pins": {
    "1": "Rel;1;0",
    "3": "BL0937CF1;0;0",
    "4": "BL0937CF;0;0",
    "12": "Btn;1",
    "17": "LED_n;2",
    "18": "LED_n;3",
    "21": "BL0937SEL;0"
  },
  "command": "backlog setChannelType 3 Current_div100; startDriver BL0937; startDriver NTP; SetupEnergyStats 1 60 60"
}


    Although i tried to use a divisor for Current, it's still not the proper factor. seems like setChannelType doesn't have any effects:

    [RTL87X0C] Tuya EP2 Smart Plug - how to find BL0937 power pins?
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  • Firmware dump lacks BL0937 pin mapping data

    #3 21948875
    me_lon
    Level 2  
    Posts: 4
    Rate: 1
    Looks like i've got no luck:

    Code: text Expand Select all Copy to clipboard
    Sorry, no meaningful pins data found. This device may be TuyaMCU or a custom one with no Tuya config data.
No module information found.
Device internal platform - rtl8720cf_ameba, equals RTL87X0C.
And the Tuya section starts at an UNCOMMON POSITION 1933312 (0x1D8000)


    Code: text Expand Select all Copy to clipboard
    {
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  "tls_ca_cnt": 0,
  "mf_test_close": true,
  "gw_wsm": {
    "nc_tp": 4,
    "ssid": "Y2xvdWRjdXR0ZXJmbGFzaA==",
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    "mq_url": "10.204.0.1:1883",
    "mq_ip": "10.204.0.1",
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    "time_z": "+01:00",
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  },
  "is_stride": 0,
  "000002qgwf": [
    {
      "mode": "rw",
      "property": {
        "type": "bool"
      },
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  ],
  "ble_app_key": "AC4DC96035BE93CC8A3BC3EA3FF35DC5",
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}
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  • #5 21948895
    me_lon
    Level 2  
    Posts: 4
    Rate: 1
    >>21948892

    Ooooh, no!
    Thank you!!!
    Could it be that the Search didn't find it because my keywords aren't written in Polish language? :)

    Btw: The Plug works now perfectly. How can we move the template into the database in order to find it via webApp?
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