Reed Switch Sensor Circuit

How to build a reed switch circuit.

Reed switch sensor circuit.

However reed switches can be fragile to use directly hence this module can make it easier to handle and mount the sensor in various applications. Reed switches and reed sensors are used along with resistors or special reed sensors with integrated resistor to give out a potentiometric feed back across two outputs as a foamed magnetic float moves along the pcb s length. There are normally open reed switches and normally closed reed switches. A spring makes it pop back out again when you take your finger away.

The contacts are usually normally open closing when a magnetic field is present or they may be. A reed switch is a very basic 2 lead switch that is switched on by a magnet being brought into the vicinity of the switch. In its simplest and most common form it consists of a pair of ferromagnetic flexible metal contacts in a hermetically sealed glass envelope. What problem do reed switches solve.

Reed sensors can be used in many applications where contactless on off is required. In case a capacitor is connected in series or in parallel with a reed switch in a closed circuit the inrush current which flows during charge and discharge of the capacitor will cause deterioration of the reed contacts. Simply put it is a magnetic switch. A reed switch is a sensor that closes the circuit in the presence of a magnetic field.

There are 2 basic types of reed switches. A push to make switch makes a connection and completes a circuit when you push it in. Capacitive loads as low as 50 pf which could even be caused by the wiring between the reed switch and the load could enough to reduce the life.