Allegro MicroSystems, LLC introduces a new Hall-effect speed and direction sensor IC with hysteresis ... Allegro's A1232 includes dual Hall elements spaced 1.63 mm apart that are ...

The A3423 dual-channel Hall-effect sensor from Allegro Microsystems Inc. provides output signals that indicate speed and direction in ... to operate over a wide voltage range of 3.8 to 24.0 ...

All it uses is a TSL261 Light-to-Voltage sensor connected to an Arduino with an Ethernet shield attached. The sensor is then taped above the meter’s flashing LED, which flickers whenever a pulse ...