When notes stuck to the water heater failed [Ryan] decided to whip up “the world’s most expensive 240V relay” using a servo, a real time clock and of course an Arduino. All in an attempt to save a ...

[Phil’s] parents grow their own organic food, but the harsh Ukraine winters make storing it a difficult proposition. Since it can drop to -30°C on occasion, they asked him to find a way to keep their ...

The 120v relay draws power from the switched light circuit. When the lights are off its impossible for someones garage door opener, or any stray signal, to turn on the collector unintentionally, which ...