Shelly Pro 3EM Switch Add-on Colour_Black We'd recommend using a 3

We'd recommend using a 3 x AA battery pack with Enviro Urban as the particulate sensor uses quite a lot of power

5 A (see the MC33926 datasheet (1MB pdf) for more information)

7/8(-) powering

3V/5V power supply

in the program initialisation

Shelly Pro 3EM Switch Add-on Colour_Black We'd recommend using a 3The Shelly Pro 3EM Switch Add on is a galvanically isolated switch designed to expand the capabilities of the Shelly Pro 3EM device. Easily control electrical devices with greater flexibility and control over your consumption. Designed for much lower loads than dedicated switches such as the Shelly Pro 1, the add on can switch 2A 240V AC or 2A 30V DC. Only compatible with Shelly Pro 3EM (not included). Note: You may require a neutral wire to use this