Shelly 2L Gen3 ws5 Built-in I2C and UART communication

Built-in I2C and UART communication interface switch

and a rough example of how to detect relative levels of particles like smoke

The SGP30 Air Quality Sensor can also be automatically detected

Use your favourite 3

Want to add more levels or a cheat code

Shelly 2L Gen3 ws5 Built-in I2C and UART communicationThe Shelly 2L Gen3 is a compact dual channel smart relay designed for lighting control in installations without a neutral wire. It operates on 220240V AC power and requires the included Shelly Bypass 1L 2L connected in parallel to the load for proper functionality in no neutral setups. The device supports Wi Fi and Bluetooth connectivity, allowing for remote control via the Shelly app or integration with home automation systems such as Home Assistant.