He built this set of no-contact limit switches using a hall effect sensor. The small black package sticking out past the end of the protoboard is the sensor. It is used to detect a magnetic field.

Instead, he used hall effect sensors and a square magnet ... fast with the release of the latest MS Flight Simulator. With 3D printing you can augment an Xbox controller with a joystick and ...

As with office paper printers that were once housed in their own room down the hall but ... commodify the 3D printer, both launched new products in April with more features and sensors making ...