Tuya Smart Plug 16A IL

General Notes

While a specific model number was not specified on the exterior, a8tyv1.3 is written on the board inside. These plugs are available in various models, with or without energy monitoring and USB ports.

The 16A smart plug with energy monitor is not flashable using tuya-cloudcutter. The main module version shown in the Smart Life app is V1.1.23, which is on the known patched firmware list.

Some disassembly and soldering is required in order to flash the device via UART.

Two Wi-Fi module variants have been observed on this main PCB: a CB2S / BK72xx variant and a WB02A / LN882H variant. Check which module is installed before choosing the ESPHome platform and GPIO mapping.

Product Images

Disassembly and Flashing

There are three external Phillips screws that must be removed to open the device (see image above). Additionally, two internal screws secure the board to the plastic casing and must also be removed.

The Wi-Fi module pins are exposed on the underside of the board and are clearly labeled. These are correct for both variants; the main PCB seems to be identical up to part assembly options.

CB2S / BK72xx variant

Connect the pins to a UART TTL adapter, then hold the CEN pin to GND for a few seconds while flashing the ESPHome firmware using ltchiptool.

WB02A / LN882H variant

Connect the pins to a USB-to-UART adapter. The PA09/BOOT pin needs to be continuously pulled down to GND while flashing. The PA09 pin is accessible via a test pad on the back of the module (see picture). The device consumes about 100mA (@ 3.3V) while booted normally and about 70mA when in download mode. When flashing is done, release PA09 and reset using CEN. More details in the LibreTiny docs.

If the module reports a blank/all-FF Tuya OTP MAC, use the on_boot MAC workaround shown in the WB02A configuration below to assign a stable MAC based on the ESPHome node name.

GPIO Pinout

CB2S	WB02A	Function
P6	PA07	CF1 pin
P7	PA06	CF pin
P8	PA10	Blue LED
P10	PA03	Switch button
P24	PA04	SEL pin
P26	PA05	Relay + Red LED

Basic configuration - CB2S / BK72xx variant

https://github.com/esphome/devices.esphome.io/blob/main/src/docs/devices/Tuya-Smart-Plug-16A-IL/config.yaml

# Basic Config
substitutions:
  friendly_name: Socket 16A IL
  device_name: socket-16a-il

esphome:
  name: ${device_name}
  friendly_name: ${friendly_name}

bk72xx:
  board: cb2s

# Enable logging
logger:

wifi:
  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:

output:
  - platform: gpio
    id: button_led
    pin: P8
    inverted: true

binary_sensor:
  - platform: gpio
    id: binary_switch
    pin:
      number: P10
      inverted: true
      mode: INPUT_PULLUP
    on_press:
      then:
        - switch.toggle: relay

switch:
  - platform: gpio
    name: Relay Switch
    id: relay
    restore_mode: "RESTORE_DEFAULT_OFF"
    pin: P26
    on_turn_on:
      then:
        - output.turn_on: button_led
    on_turn_off:
      then:
        - output.turn_off: button_led

sensor:
  - platform: hlw8012
    model: BL0937
    cf_pin:
      number: P7
      inverted: true
    cf1_pin:
      number: P6
      inverted: true
    sel_pin:
      number: P24
      inverted: true
    current:
      name: Current
      filters:
        - multiply: 0.5
    voltage:
      name: Voltage
    power:
      name: Power
    energy:
      name: Energy
    voltage_divider: 800
    current_resistor: 0.001 ohm
    update_interval: 1s
    change_mode_every: 1

Basic configuration - WB02A / LN882H variant

https://github.com/esphome/devices.esphome.io/blob/main/src/docs/devices/Tuya-Smart-Plug-16A-IL/config-wb02a.yaml

# Basic Config
substitutions:
  friendly_name: Socket 16A IL
  device_name: socket-16a-il

esphome:
  name: ${device_name}
  friendly_name: ${friendly_name}
  # Some WB02A/LN882H units have a blank/all-FF Tuya OTP MAC.
  # Generate a stable MAC from the ESPHome node name.
  on_boot:
    priority: 800
    then:
      - lambda: |-
          const char *name = App.get_name().c_str();

          uint32_t hash = 2166136261u;
          while (*name) {
            hash ^= (uint8_t) *name++;
            hash *= 16777619u;
          }

          uint8_t mac[6] = {
            0x02,  // locally administered, unicast
            0xA0,
            0xB0,
            (uint8_t) (hash >> 16),
            (uint8_t) (hash >> 8),
            (uint8_t) hash
          };

          WiFi.setMacAddress(mac);

ln882x:
  board: generic-ln882hki

# Enable logging
logger:

wifi:
  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:

output:
  - platform: gpio
    id: button_led
    pin: PA10
    inverted: true

binary_sensor:
  - platform: gpio
    id: binary_switch
    pin:
      number: PA03
      inverted: true
      mode: INPUT_PULLUP
    on_press:
      then:
        - switch.toggle: relay

switch:
  - platform: gpio
    name: Relay Switch
    id: relay
    restore_mode: RESTORE_DEFAULT_OFF
    pin: PA05
    on_turn_on:
      then:
        - output.turn_on: button_led
    on_turn_off:
      then:
        - output.turn_off: button_led

sensor:
  - platform: hlw8012
    model: BL0937
    cf_pin:
      number: PA06
      inverted: true
    cf1_pin:
      number: PA07
      inverted: true
    sel_pin:
      number: PA04
      inverted: true
    current:
      name: Current
      accuracy_decimals: 3
    voltage:
      name: Voltage
    power:
      name: Power
    energy:
      name: Energy
    voltage_divider: 1600
    current_resistor: 0.001 ohm
    update_interval: 1s
    change_mode_every: 1

Additional notes

This guide was based on the WHDZO3 guide and adapted to this board.