This month's ranking
Automation building blocks for custom-built irrigation projects.
A cheap entry point for controlling a single valve or pump from a microcontroller (Arduino, ESP32, Raspberry Pi). This particular model's listing doesn't confirm optocoupler isolation — before wiring it to a 24V AC load, verify that with the seller or add a separate optocoupler so you don't risk frying your microcontroller.
With 8 channels you can control up to 8 valves/zones from a single microcontroller — enough to build a complete DIY irrigation controller. It includes an optocoupler (real electrical isolation between the 5V logic and the switched load) and NO/NC terminals, making it safer than a 1-channel module without that isolation confirmed.
Unlike the relays in this ranking (1-channel and 8-channel), which are 'raw' modules meant to connect to an Arduino/ESP32, this one has its own built-in WiFi — you don't need to program anything or add a separate microcontroller, it's controlled directly from the eWeLink app (or Alexa/Google) as soon as you connect it to your network. 2 channels, dry-contact output compatible with 24V, up to 10A.