[Bob] as well as his other half utilize a bed heating pad. In the winter, they normally turn it on about an hour before bedtime so the bed is great as well as warm. The issue is, if they unintentionally leave it on, they’ll get up a few hours later: overheated. What they needed was an advanced timer system.
A typical outlet timer wouldn’t in shape his needs: a lot of of the year the pad must shut off after a minor delay, however in the wintertime they like to leave the heating pad on at a much lower temperature. [Bob] made a decision to produce a custom-made timer with a microcontroller to supply adjustable duration as well as heating levels.
The circuit is simple. It consists of a microcontroller, a 2-digit LED display, two buttons, as well as two wires that link to the heating pad’s original controller. The final develop enables you to set the time the pad turns on, turns off, and/or down a few levels. It’s a amazing hack, as well as you can see exactly how the interface works in the video complying with the break.