BL0937 not working with wb2s

[brunosalezze]

I have a smart power plug with a WB2S chipset and a BL0937 power/current/voltage monitor. Libretiny works well to sense button and control LED and Relay, but the BL0937 readings only return zeros. The pinout is correct since I opened the device and tested with OpenBeken. With OpenBeken the readings are perfect. My YAML is the following:

bk72xx: board: wb2s

logger: level: DEBUG

sensor:

Power sensor

• platform: hlw8012 model: BL0937 sel_pin: number: PWM4 inverted: true cf_pin: PWM1 cf1_pin: PWM2 change_mode_every: 1 update_interval: 5s

  Current sensor

  current: name: BL0937 Current accuracy_decimals: 8 filters:

  • multiply: 1

    Voltage sensor

    voltage: name: BL0937 Voltage accuracy_decimals: 8

    Power sensor

    power: id: power name: BL0937 Power accuracy_decimals: 8

    Energy sensor

    energy: id: energy name: BL0937 Energy accuracy_decimals: 8

• platform: adc pin: ADC3 name: WB2S ADC update_interval: 5s filters:

  • multiply: 100

binary_sensor:

Binary sensor for the button press

• platform: gpio name: button pin: number: RX1 inverted: false on_press:
  • switch.toggle: relay

switch:

Switch to toggle the relay

• platform: gpio id: relay name: switch pin: PWM5 inverted: true on_turn_on:

  • switch.turn_on: led on_turn_off:
  • switch.turn_off: led

• platform: gpio id: led name: led pin: PWM0 inverted: false`

and the OpenBeken config is the following:

"vendor": "Tuya", "bDetailed": "0", "name": "Full Device Name Here", "model": "enter short model name here", "chip": "BK7231T", "board": "TODO", "flags": "33554432", "keywords": [ "TODO", "TODO", "TODO" ], "pins": { "6": "LED;57", "7": "BL0937CF;56", "8": "BL0937CF1;55", "10": "Btn_n;53", "23": "ADC;0", "24": "BL0937SEL;9", "26": "Rel;37" },

Any help for further debuging?

[Cossid]

It has been the general experience that you need to invert the pins for sel, cf, and cf1 on the Beken platform. No idea why, but that is how Tuya generally has the configs as well.

[brunosalezze]

Thank you, with this config the device works as expected:

sensor:

Power sensor

• platform: hlw8012 model: BL0937 voltage_divider: 883.278 current_resistor: 0.000908 ohm sel_pin: number: PWM4 inverted: true cf_pin: number: PWM1 inverted: true cf1_pin: number: PWM2 inverted: true change_mode_every: 3 update_interval: 5s