Controlling a 220V pool pump with a Wi-Fi smart plug

Pump control cabinet with bypassed mechanical timer, and new contactor to its left. The contactor is being controlled by the Sonoff S31 smart plug in the outlet below.

Devices that require 220 volt split-phase circuits, like larger pumps and electric water heaters in North America, can be difficult to find “smart” switches for—especially when you’re looking for a non-cloud solution that respects your privacy. I wanted a Wi-Fi switch for my pool pump that I could control with my OpenHAB server. After a… Continue reading Controlling a 220V pool pump with a Wi-Fi smart plug

Flashing the Sonoff S31 with Tasmota using a Mac (no soldering!)

Flashing the firmware on the Sonoff S31 can seem intimidating at first. You have to take it apart, exposing the electronics inside, then connect your computer directly to tabs on the PC board using a serial breakout device like the Sparkfun Serial Basic. But it’s not that hard. And you can do it without soldering.