By placing a unit equipped with an ADXL345, an accelerometer for detecting motion, or a Piezo sensor on a door ... and you can link these to an Arduino to build a lie detector at home. Whether you ...

this DIY motion trigger for a DSLR is a quick and easy build, and probably loads more fun. The BOM on [Jeremy S Cook]’s build is extremely short – just a PIR sensor and an optoisolator ...