How can we interface relay using 8051 microcontroller?
Interfacing 8051 with an electromechanical relay
- Connect the oscillator circuit to pins 19 and 20.
- Connect one end of the capacitor to the EA’ pin and the other to the resistor.
- We are using port 2.o as the output port, to control the relay using a relay driver circuit.
What is relay interfacing?
Relays are devices which allow low power circuits to switch a relatively high Current/Voltage ON/OFF. For a relay to operate a suitable pull-in & holding current should be passed through its coil.
What is required to interface an electromechanical relay to 8051?
Explanation: We need a ULN2803 for driving a relay because the relay coil requires 10mA or more current to be energized. If microcontroller pins are not able to provide sufficient current to drive relays then we need ULN2803 for driving relays.
How do you drive a relay with a microcontroller?
A relay can be easily interfaced with microcontroller using a transistor as shown below. Transistor is wired as a switch which carries the current required for operation of the relay. When the pin RB7 of the PIC microcontroller goes high, the transistor BC547 turns On and current flows through the relay.
Which of the following interface is used for waveform generation using the 8051 microcontrollers?
In this section we will see how DAC (Digital to Analog Converter) using Intel 8051 Microcontroller. We will also see the sinewave generation using DAC. The Digital to Analog converter (DAC) is a device, that is widely used for converting digital pulses to analog signals.
Which basic driver is required for interfacing of relay with microcontroller?
The transistor is required for driving the relay as it requires more than 50mA of current, that the microcontroller is unable to provide. We can also use ULN2003 instead the transistor, it is a wiser choice if more than two or three relays are required for the application, check the Relay module circuit.
What is the name of diode used in interfacing of relay with microcontroller?
Interfacing Relay with PIC Microcontroller using Transistor The diode D1 is used to protect transistor and the microcontroller from Back EMF generated in the relays coil. Normally 1N4148 is preferred as it is a fast switching diode having a peak forward current of 450mA. This diode is also known as freewheeling diode.
What is the advantage of interfacing DC motor with 8051 microcontrollers?
The four quadrant DC motor speed control operation can be achieved by interfacing DC motor with 8051 microcontroller. The speed of the motor as well as the operation of motor in four quadrants such as forward brake, reverse brake, clockwise, anti-clockwise rotation can be controlled using 8051 microcontroller.