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[BK7238 / T1] Smart Power Strip RH-EU411-4UW with energy monitoring

flobuljeedom 48 1
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  • #1 21838562
    flobuljeedom
    Level 8  
    Hello,

    Today I’m sharing a teardown and analysis of a Tuya-based DIN rail smart switch with power monitoring.
    This device offers: 5 relay outputs, energy monitoring, Tuya Smart Life compatibility

    📦 External overview
    [BK7238 / T1] Smart Power Strip RH-EU411-4UW with energy monitoring
    Embossed case label with model RH‑EU411‑4U‑W and specs for input power, USB output, and 2.4 GHz Wi‑Fi

    🔧 Opening the enclosure
    To open it, use a triangle screwdriver (sic) or a small flathead screwdriver.
    [BK7238 / T1] Smart Power Strip RH-EU411-4UW with energy monitoringPCB of a DIN-rail switch with relays, transformer, and wires, resting on denim-covered legs

    Inside we find the main board.
    A small carrier circuit:
    Close-up of a PCB with a Tuya T1-U-HL module under a metal shield showing a QR code

    And a BL0942 energy metering IC chip:
    Close-up of a PCB with a SOIC IC and surrounding SMD components

    The BL0942 is connected via UART to the T1-U-HL module for energy reporting.

    The device uses a T1-U-HL module. Datasheet
    This version integrates a BK7238.
    Unlike this version which uses a BK7231N.

    🔍 Firmware & pin extraction
    Connect the FT232 to 3V3, RX, TX and GND from the T1-U-HL carrier and start BK7231 GUI flash tool.

    Configuration extracted from Tuya firmware:
    Au format JSON :
    {
       "rl1_lv":"1",
       "bt_type":"0",
       "rl3_pin":"24",
       "rl3_lv":"1",
       "net_trig":"4",
       "rl4_pin":"21",
       "jv":"1.0.1",
       "netled1_lv":"1",
       "netled_reuse":"0",
       "total_bt_pin":"22",
       "nety_led":"0",
       "total_stat":"2",
       "over_cur":"16700",
       "rl5_lv":"1",
       "reset_t":"5",
       "netled1_pin":"23",
       "chip_type":"3",
       "rl2_lv":"1",
       "lose_vol":"0",
       "over_vol":"0",
       "module":"T1-U-HL",
       "ch_cddpid1":"9",
       "rl2_pin":"9",
       "ch_cddpid4":"12",
       "ch_cddpid5":"13",
       "ch_cddpid2":"10",
       "ch_cddpid3":"11",
       "rl5_pin":"6",
       "total_bt_lv":"0",
       "ch_dpid5":"5",
       "ch_num":"5",
       "ele_fun_en":"1",
       "rl1_pin":"26",
       "rl4_lv":"1",
       "ch_dpid3":"3",
       "ch_dpid4":"4",
       "netn_led":"0",
       "vol_def":"0",
       "ch_dpid1":"1",
       "ch_dpid2":"2",
       "crc":"12",
       "em_sys_env":"T1"
    }
    


    Device configuration, as extracted from Tuya: 
    - Relay (channel 3) on P24
    - Relay (channel 4) on P21
    - Pair/Toggle All Button on P22
    - WiFi LED on P23
    - Relay (channel 2) on P9
    - Relay (channel 5) on P6
    - Relay (channel 1) on P26
    Device seems to be using T1-U-HL module, which is using BK7238.
    Device internal platform - T1, equals BK7238.
    And the Tuya section starts at 2052096 (0x1F5000), which is a default T1/XR806 and some T34/BK7231N offset.
    


    Relay mapping:
    Channel Pin
    Relay 1 P26
    Relay 2 P9
    Relay 3 P24
    Relay 4 P21
    Relay 5 P6
    Other functions
    Function Pin
    Toggle / Pair button P22
    WiFi LED P23
    Energy monitoring is enabled and handled through the BL0942 via UART.

    Current template:
    {
      "vendor": "Tuya",
      "bDetailed": "1",
      "name": "Smart Power Strip RH-EU411-4UW",
      "model": "T1-U-HL 5CH DIN",
      "chip": "BK7238",
      "board": "T1-U-HL",
      "flags": "1024",
      "keywords": [
        "Tuya",
        "BK7238",
        "DIN rail",
        "energy monitoring",
        "BL0942",
        "relay module",
        "OpenBeken"
      ],
      "pins": {
        "6": "Rel;5",
        "9": "Rel;2",
        "21": "Rel;4",
        "22": "Btn_Tgl_All;0",
        "23": "WifiLED_n;0",
        "24": "Rel;3",
        "26": "Rel;1"
      },
      "command": "startDriver BL0942",
      "image": "https://obrazki.elektroda.pl/5119999700_1771076454.jpg",
      "wiki": "https://www.elektroda.com/rtvforum/topic_YOUR_TOPIC.html"
    }
    

    Product link: https://fr.aliexpress.com/item/1005006854933102.html
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