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TomZN TOB9-VAP

TomZN TOB9-VAP

Device Type: misc
Electrical Standard: global
Board: bk72xx
Difficulty: Disassembly required, 3/5

Notes

  • Uses BL0942 for energy monitoring, which requires calibration
  • Uses an H-Bridge for controlling the output instead of a standard relay. One key difference is that the H-Bridge retains the last position upon power off without the need of restore_mode

Product images

device

board

Programming

Tuya Cloudcutter was not able to work for this device (with firmware v1.0.15). If your device has an older firmware, it may be worth a try.

This device is powered by a CBU board (BK7231N), you can read LibreTiny's instructions on how to flash it.

Disassembling this device is simple, provided you find a way to remove the golden tubes. Here is one way:

disassembling

GPIO Pinout

PinFunctionNotes
GPIO09Red LEDinverted
GPIO10RX for BL0942RX1
GPIO11TX for BL0942TX1
GPIO15Blue LED (status)inverted
GPIO17Buttoninverted
GPIO24Bridge forwardpulse
GPIO26Bridge reversepulse

Basic Configuration

esphome:
  name: TomZN.TOB9-VAP
  min_version: 2024.12.0


bk72xx:
  board: cbu


logger:


captive_portal:


uart:
  tx_pin: TX1
  rx_pin: RX1
  baud_rate: 4800
  stop_bits: 1


binary_sensor:
  - platform: gpio
    id: power_button
    pin:
      number: 17
      inverted: true
      mode: INPUT_PULLUP
    on_multi_click:
      - timing:
          - ON for at most 1s
          - OFF for at least 0.2s
        then:
          switch.toggle: main_switch
      - timing:
          - ON for at least 4s
        then:
          button.press: reset


output:
  - platform: libretiny_pwm
    id: red_led_output
    pin:
      number: P9
      inverted: true


light:
  - platform: status_led
    id: blue_led
    pin:
      number: P15
      inverted: true
  - platform: monochromatic
    id: red_led
    output: red_led_output


switch:
  - platform: hbridge
    name: Switch
    id: main_switch
    on_pin: GPIO24
    off_pin: GPIO26
    pulse_length: 60ms
    wait_time: 30ms
    on_turn_on:
      light.turn_on: red_led
    on_turn_off:
      light.turn_off: red_led


sensor:
  - platform: bl0942
    line_frequency: 50Hz
    update_interval: 10s
    current:
      name: Current
      filters:
        # The chip reports some current even when there is no load
        - lambda: if (x < 0.02) return 0.0; else return x;
    voltage:
      name: Voltage
    power:
      name: Power
      filters:
        # The chip reports some power even when there is no load
        - lambda: if (x < 0.5) return 0.0; else return x;
    energy:
      name: Energy
      unit_of_measurement: kWh
    frequency:
      name: Frequency
      accuracy_decimals: 2
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