Transistor is wired as a switch which carries the current required for operation of the relay. The pic microcontroller from microchip is one the famous and most used microcontrollers. A simulation of this example using proteus is provided at the end of the post. So if the relay is rated for 4a resistive loads, you should only use it for 0. Nov 02, 2012 relay interfacing with microcontroller. Please note that when there is no load, the relay command fully works, without resetting the microcontroller. This current switches on the relay which in turn switches on the ac load the bulb the diode d1 1n4007 is used as a flyback diode. Mar 02, 20 interfacing relay with pic microcontroller using transistor. Interfacing relay with pic microcontroller youtube. The kit supports in system programming isp which is done through usb port. One of the technical specifications to be taken in account is the current which can be sourced from a microcontroller pin maximum pin source current 25ma for pic18f4550. So by using relay switch we easily turn on or off any high voltage device by microcontroller. Interfacing of relay with microcontroller aticleworld. To interface relay with microcontroller we need a driver circuit to drive the power to relay.
The zigbee is halfduplex protocol wherein transmitting and receiving the data is not possible at the same time. Dc motors need much more current than a microcontroller can provide, so it needs separate drivers. In this tutorial we will learn how to interface lm35 temperature sensor with pic18f4520 microcontroller and display its output on the lcd module. Subscribe mplab xc8 for beginners tutorial 2 flashing an led. The zigbee module can be directly interfaced to the microcontroller of rx and tx pins and doesnt require any external middle ware devices.
If you want to know more about relay driver circuit uln2003, relay working and relay interfacing with arduino check these articles. Interfacing devices with pic microcontroller studentcompanion. Microcontroller components, a typical microcontroller application, motorola 68hc12 microcontroller, 68hc12 programming model, 68hc12 data types, auto prepost decrementincrement, indexed addressing, 68hc12 move instructions, hc12 logic instructions, multiply and. From the above equation the value of r3 comes out to be 5. Microcontroller boardscontrol the relay operations by using pic16f18f slicker board. How to interface relay with pic16f877a pic development board. Following things should be taken into account while designing the. Apr 24, 2018 this post shows how to use mikroc library for st7735r 1. In this project we will interface a relay with pic microcontroller pic16f877a. The steps involved in interfacing an lcd with 8051 1. Post contents1 prerequisites2 components required3 introduction3. Microcontroller may stop working by the negative voltages produced in the relay due to its back emf.
This circuit can be used to interface with pic microcontroller. Interfacing relay with pic microcontroller using transistor. Wiring diagram for 2 relay module interfacing with arduino is shown in the figure given below. Relay module interfacing with pic16f877a microcontroller. 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. Relay interfacing with microcontroller using uln2003a the. Electrical engineering stack exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts.
Before interfacing, every one should know about the relay driver which is used to interface the relay to microcontroller. A relay can be used to switch high power devices from a. As the pic microcontroller operates at 5v a potential divider formed from resistors must be used to reduce the pic microcontroller output signal to 1. First you should have a look at relay interfacing with microcontroller using uln2003a, you will get a better idea about its interfacing with different microcontrollers.
In this project report description of inputoutput interfacing of microcontroller and the program, which is. When the relay needs to be shut down, microcontrollers output is off. In this tutorial we will discuss the interfacing of the relay board with 40 pin avr development board. Relay module interfacing with pic16f877a microcontroller how to interface ac load through relay with pic microcontroller with programming. Oct 21, 2014 when microcontroller makes the output line high binary 1, the transistor is switched on. The pic was the first widely available device to use. Dec 23, 2014 interfacing relay with lpc2148 we now want to control the relay operations by using lpc2148 primer board. By bitahwa bindu mikroc pro for pic, tutorials home automation, interfacing, iot, microcontroller, mikroc, pic, relay, tutorials watch the video tutorial.
A relay can be easily interfaced with microcontroller using a transistor as shown below. In this tutorial we are going to see lpg gas sensor interfacing with pic16f877a. Because of its reliability it is commonly preferred by embedded engineers for industrial applications. Relay interfacing with microcontroller using uln2003a. Interfacing a relay with pic microcontroller mikroc.
This tutorial is meant for beginners in the field of atmel avr programming. This may also damage the device connected to relay so as to avoid. See more ideas about pic microcontroller, microcontrollers, pics. In this tutorial, we will learn about the interfacing of the relay relay connection with microcontroller and learn how to control a device using the relay. Oct 18, 2015 hello i have fear in my mind, first time i am going to use relay in my project. A relays is an electrical switch that opens and closes under control of another electrical circuit. This section will help to enable those with limited electronics experience to successfully complete these interfacing tasks. Electromechanical relays interfacing circuits with. Define function for sending command to the lcd using 8051 a. Ssrs make interfacing with ac voltage really, really simple. Interfacing lm35 temperature sensor with pic microcontroller. Relay module interfacing with pic16f877a microcontroller ac load.
Aug 19, 2017 first you should have a look at relay interfacing with microcontroller using uln2003a, you will get a better idea about its interfacing with different microcontrollers. The below list of pic tutorials and pic projects helps you to learn pic series of microcontrollers from very basic level to advanced applications. Interfacing hcsr04 ultrasonic rangefinder with pic 16f877a microcontroller. The general sense esp techniques can be applied to any microcontroller.
The input is taken from the microcontroller pins and the output corresponding to each input is given to the 5 relays on the output. Technically, a relay is an electromagnetic switch that is. The transistor will be in off state when the when the pin p2. Microcontroller is a programmable digital processor with necessaryperipherals. Interfacing relay with pic microcontroller mikroc electrosome. The zigbee is a transceiver module constructed with transmitter and receiver. Singlesupply incircuit serial programming enable bit rb3pgm pin has. Interfacing a relay with microcontroller electronics. This book is a sequel to my first effort pic microcontrollers, an introduction to microelectronics.
Interfacing relay to microcontroller dna technology. Interfacing relays and transistors 64 8255 pc interface card applications manual connecting a spdt relay heavy dc or ac loads a spdt relay typically can handle heavy current loads. Relay interfacing with pic microcontroller pic16f877a circuit digest. Programming with pic microcontroller research design lab. The microcontroller will switch on the transistor which in turn will switch on the relay, anything connected to the contacts of the relay can thus be switched on or off. Programmable relay switch, programmable logic controller, microcontroller, arduino, iot, remote sensing 1. Current flows from the 12v input to the relay and then to the ground via the transistors collector pin.
Feb 05, 2014 to control our high voltage device like home appliance by pic microcontroller, we have to have clear idea on interfacing relay with pic microcontroller. If possible, the relay should be powered by a separate power supply to enable a connection of relays requiring a different voltage like for example a 12v relay which is different form the 5v supplied to the microcontroller. When microcontroller makes the output line high binary 1, the transistor is switched on. A pic microcontroller is a single integrated circuit small enough to fit in the palm of a hand. May 10, 20 a relay is activated by energizing its coil. Relay provides isolation between two voltage levels and it is generally use to control ac appliances. Pic microcontrollers can be used as the brain to control a large variety of products. In this project we will interface a relay with pic microcontroller. Write the command to the datacommand port of the lcd through our 8051 microcontroller. In order to control devices, it is necessary to interface or connect them to the pic microcontroller. Relay module interfacing with pic16f877a microcontroller, in this pic microcontroller tutorial you will learn how to interface relay module with any pic microcontroller or any microcontroller.
But have run into a problem while interfacing the micro controller with a relay. Relay interfacing with microcontroller 8051 microcontroller. Microcontroller interfacing to relays using uln2003, in this article, you will learn how to interface microcontroller to relays using uln2003 relay driver circuit. Interfacing relay with 8051 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. See the block diagram of driver circuit which i used in my project. If desired, the relay can be powered by a separate power supply, so, for. See the block diagram below to how we turn on or off a 230 volt ac bulb by micro controller. When the coil is energized, the switch closes, connecting the two. Microcontroller basics pdf slides 46p this book covers the following topics.
Nov 23, 2014 interfacing hcsr04 ultrasonic rangefinder with pic 16f877a microcontroller dht11 humidity sensor interface with pic16f877a p10 rg led display interface with stm32f030f4 32bit mcu. When the microcontrollers output is on, the relay turns on too. Automatic street light control using 8051 micro controller,keil ide and proteus simulation duration. When the pin rb7 of the pic microcontroller goes high, the transistor bc547 turns on and current. Jun 07, 2011 interfacing relay with 8051 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Relay i am using here is of 12v, i am using this one because its mostly used in projects. After introducing the pic16f877 and its programming, this book covers the fundamental techniques and advanced level techniques of embedded systems programming in a general sense. The input is taken from the microcontroller pins and the output corresponding to each input is given to the 5. Microcontroller interfacing circuits pdf 44p download book.
From mechanical to solid state relays, there are various type of relays are available in. In this tutorial im connecting one relay in port b. Uln2803 is used as a driver for port io lines, drivers output connected to relay modules. Here i will present my lcd library which you can use to create lcd based applicationprojects quickly. How to turn on and turn off relay with pic microcontroller by using digital output ports of pic16f877a microcontroller. Here i used diode d11n4148ws, resistor r1 1k, transistor t1 bc547, 12 v power supply and 6v relay. You can turn on a big ac or dc load such as a home appliance running on 120 vac or big dc motor, by energizing the coil in the same manner as the reed relay. To understand how microcontroller works as a multifunctional relay it is necessary to know about microcontroller working, functions and its applications.
This attempted to provide a comprehensive introduction to the subject via a single type of microcontroller, which is essentially a complete computer on a chip. Different dc motors need different voltages and operating high voltage motor from a low voltage controller is not a feasible option. In simple words, we attach any pin of the pic with one pin of relay coil and make the other pin to ground. Relay is a mechanical device to control high voltage, high current appliances on or off from lower voltage levels. When i measure the output across the diode without the relay i have 12v when the pic. If you continue browsing the site, you agree to the use of cookies on this website.
Example for interfacing a relay board with low cost 40 pin avr development board to control a 220v ac load like a bulb. It is therefore connected to ouput pins of the microcontroller and used to turn onoff highpower devices such as motors, transformers, heaters, bulbs, antenna systems etc. May 21, 2016 automatic street light control using 8051 micro controller,keil ide and proteus simulation duration. Relay interfacing with pic microcontroller pic16f877a. Interfacing the uln2803 darlington driver ic to pic microcontroller 9. If possible, the relay can be powered by a separate power supply to enable connection of relays requiring a different voltage like for example a 12v. Jun 12, 2018 in this project we will interface a relay with pic microcontroller pic16f877a. Introduction research and development in the field of automation and control for industrial applications has increased rapidly in the recent. Microcontroller interfacing to relays using uln2003 relay. A simulation of this example using proteus is provided at the. Both microcontrollers and microprocessors are complex sequential digitalcircuits meant to carry out job according to the program instructions. Interfacing a relay with microcontroller electronics forum. In this tutorial we will learn how we can use lcd modules with microchip pic microcontrollers.
Microcontroller interfacing techniques document revision. For demo i will use pic18f4520 microcontroller but. Microcontroller interfacing circuits revolution revolution education ltd. This circuit is an example of interfacing a relay with a microcontroller using a transistor. A relay can be used to switch higher power devices such as motors, light bulbs and solenoids. When the coil is energized, the switch closes, connecting the two contacts together. This post shows how to use mikroc library for st7735r 1. A normal bipolar transistor used in switch mode like the bc108 or a darlington pair like the bcx38 can do the job. To interface a device to a microcontroller simply means to connect a device. Interfacing relay with lpc2148 we now want to control the relay operations by using lpc2148 primer board. A relay is an electromagnetic switch which is used to switch high voltagecurrent using low power circuits. Relay is a combination of the mechanical switch and an electromagnet, it prefers when we want to control a device or machine using the low strength signal. Learn how to control high voltage devices with a relay and pic microcontroller such as 220v powered devices from a pic microcontroller.
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