The timer is based on an Arduino Pro Mini and an HX1230 LCD with a simple piezo speaker for audible alerts. A single button controls operation of the timer, with short presses incrementing each ...

Wire Up Prepare ... I’ve specified a piezo speaker; don’t use an ordinary 8Ω dynamic speaker. It’ll draw too much current and possibly damage the Arduino. Snap headers.

An ever-increasing percentage of new cars are coming equipped with steering wheel controls for the stereo, however, you’ll lose the button control ... to direct wiring the Arduino outputs ...