Tuya switch WB3S

Configure tuya switch OpenBK7231T

Flashing for BK7231T

remove smd components

Go to pages firmware instruction

OpenBK7231T_App

connect uart 3.3v !!!!

conect new WIFI "openbk..."

go "192.168.4.1"

configure WIFI

configure module:

P1 wifi_led_n 0

P9 rel 1

P10 btn 1

configure MQTT

home assistant config:

"name" = name switch

  
light:
  - platform: mqtt
    unique_id: "name"
    name: "name"
    state_topic: ""name"/1/get"
    command_topic: ""name"/1/set"
    qos: 1
    payload_on: 1
    payload_off: 0
    retain: true
    availability_topic: ""name"/connected"
  
  

if you want add temp sensor:

P23 adc 2

NTC thermistor a B value of 3950 100k

resistor 20k

home assistant config:

"name" = name switch

    
sensor:
  - platform: mqtt
    state_topic: ""name"/2/get"
    name: "mqtt temp sens"
    qos: 1
    device_class: power
    availability_topic: ""name"/connected"
  
  

"name" = name switch

  
template:
  sensor:
   - name: Temperatura NTC kabinet
      unique_id: temperature_kabinet
      device_class: temperature 
      state: >
        {% set Vo = states('sensor.mqtt_temp_sens')|float %}
        {% set res = 200000 %}
        {% set term  = 100000 %}
        {% set nom_t  = 27 %}
        {% set adc  = 3584 %}
        {% set B = 3950 %}
    {% set tr  =  res / ((adc / Vo) - 1)  %}
    {% set steinhart = term /  tr%}
    {% set steinhart1 = log(steinhart) %}
    {% set steinhart2 = steinhart1 / B %}
    {% set steinhart3 = steinhart2 + (1.0 / (nom_t + 273.15))%}
    {% set steinhart4 = 1.0 / steinhart3  %}
    {% set steinhart5 = steinhart4 - 273.15%}

    {{ steinhart5  |round(2) }}
  unit_of_measurement: '°C'