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Microcontroller Relay Interface and Driver

2015-03-03 17:14  
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Microcontroller Relay Interface and Driver
Many microcontroller designs typically mix multiple interfacing methods. A microcontroller (µC) system can be viewed as a system that reads from inputs, performs processing and writes to outputs. Microcontrollers are useful to the extent that they communicate with other devices, such as sensors, motors, switches, keypads, displays, memory and even other micro-controllers. Often a need arise to interface output of the microcontroller with an electromagnetic relay (EMR). Relays are devices which allow low power circuits to switch a relatively high Current and/or Voltage on/off. Here is a simple microcontroller-relay interface circuit with perfect “galvanic isolation”. “Galvanic isolation”means an isolation between two circuits, i.e. no metal conduction between those circuits. Transfer will then take place for instance optical or by induction. Galvanic means “related to DC”. Galvanic Isolation says that the driver circuit is separated from the signal source in such a way that DC current cannot bridge the connection. The widely accepted method for galvanic isolation is the use of optical isolator (optocoupler/photocoupler).