Contents
What is a relay driver?
A Relay driver IC is an electro-magnetic switch that will be used whenever we want to use a low voltage circuit to switch a light bulb ON and OFF which is connected to 220V mains supply. Relays have unique properties and are replaced with solid state switches that are strong than solid-state devices.
Which basic driver is required for interfacing of relay with microcontroller?
The 1N4007 is a clamp diode, used for the relay’s electromagnetic coil. When the relay will turned off, there are chances for high voltage spikes and the diode will suppress it. The transistor is required for driving the relay as it requires more than 50mA of current, that the microcontroller is unable to provide.
How is a relay circuit used in a microcontroller?
A relay driver circuit acts as a buffer between the control board´s intelligence and the relatively high current drawn from the relay coil. A microcontroller typically will output a high or low logic level (3.3 or 5v for a high, and 0 volts for a low) and is used to switch on a driver transistor or integrated circuit.
What is the purpose of a relay driver circuit?
What is a Relay Driver Circuit? A relay driver circuit acts as a buffer between the control board´s intelligence and the relatively high current drawn from the relay coil.
When does 8051 microcontroller turn on the interfacing relay?
Whenever 8051 microcontroller is turned ON initially the controller is in reset state and all the controller pins are HIGH which would result in TURNING ON the relay every time power is turned ON or if there is a power fluctuation.
How does a microcontroller communicate with other devices?
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).