What is a Relay?
|Figure 1.1 Representation of Relay|
Advantage of relay:
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Types of Relays:
Interfacing relay to 8051 microcontroller
There are many ways to interface a relay to 8051 microcontroller. But simple and easy way for beginners is by using ULN2003/ULN2803. In this tutorial, a 5volts operated relay is taken for the demonstration. But the circuits shown can be useful to 12Volts operated relays also.
What happens when a relay is directly interfaced to 8051 micro controller?
What is the need of ULN2803/ULN2003?
What is the need of fly wheel diode?
Figure 1.4 Spark Generated when inductor coil current is suddenly off