Dual relay controlled via WiFi. Uses ESP-07 module to allow external WiFi antenna.
This project was motivated by a desire to control my pool lights from my home automation system. I first attempted to use a Sonoff wifi controlled module with a custom hacked firmware. This would have been successful except that the unit is housed in the metallic NEMA enclosure for the pool control hardware which acted as a Faraday cage, preventing the wifi signal from reaching the Sonoff unit.
This project uses an ESP-07 module containing the ubiquitous ESP8266. The advantage of the ESP-07S is that in addition to a WiFi antenna printed onto the PC board, it has a connector allowing a coax to an external antenna, which can then be mounted outside the enclosure.
- Built in power supply allows direct connection to AC mains (85 ~ 305VAC). No external adapter required.
- Two isolated, independantly controlled, normally open relay contacts rated at 10 amps each.
- Connector for external WiFi antenna allows unit to be mounted within a metal enclosure.
- Over the air software updates.
- Wifi control via MQTT subscription.
(https://github.com/n0dyjeff/WifiRelay-Tasmota)
All the documentation is here, but if you're not interested in building your own, I've built up a few of these and offered them on Amazon, ebay, and Tindie. It's also available direct from my via my web site, N0DY Electronics.
