If you want to know more about relay driver circuit uln2003, relay working and relay interfacing with arduino check these articles. Microcontroller interfacing to relays using uln2003 relay. Interfacing gsm module with pic microcontroller youtube. Microcontroller interfacing with different elements this is a step by step guide to interfacing different electronic elements with microcontrollers what.
From the above equation the value of r3 comes out to be 5. The transistor will be in off state when the when the pin p2. Microcontroller interfacing circuits section 3 note on the basic code samples simple basic code examples are provided within each subsection. 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. Applications of interfacing devices with microcontroller.
May 10, 20 a relay is activated by energizing its coil. Automatic street light control using 8051 micro controller,keil ide and proteus simulation duration. Microcontroller interfacing with different elements. Pdf this paper describes the implementation of a pic microcontroller in a conventional. Interfacing relay with pic microcontroller using transistor. Pdf design and implementation of electronic control trainer with. Jun 07, 2011 interfacing relay with 8051 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If money is no object, then the first thing i go to is a solid state relay ssr, instead of the mechanical switch variety. Technically, a relay is an electromagnetic switch that is. Interfacing relay with pic microcontroller mikroc electrosome. To interface relay with microcontroller we need a driver circuit to drive the power to relay. In this project we will interface a relay with pic microcontroller pic16f877a. Relay interfacing with pic microcontroller pic16f877a. If you continue browsing the site, you agree to the use of cookies on this website.
Jun 12, 2018 in this project we will interface a relay with pic microcontroller pic16f877a. Ive had to switch 120vac with a dc control voltage many times in the past, and ive alwyas started with crydom ssrs. To design and fabricate over current protection relay using pic micro. In this part we will cover their interface with microcontrollers. Microcontroller interfacing with relay rickeys world. Relay module interfacing with pic16f877a microcontroller ac load. Interfacing lcd module with microcontroller embedjournal. Microcontroller boardscontrol the relay operations by using pic16f18f slicker board. Oct 21, 2014 hello friends, this is the third part of my tutorial series on relays. In this project report description of inputoutput interfacing of microcontroller and the program, which is. When the coil is energized, the switch closes, connecting the two contacts together. See more ideas about pic microcontroller, circuit diagram and header file.
The samples are not complete programs but sections of code that can be included within a main program when using that particular component. Relay is a mechanical device to control high voltage, high current appliances on or off from lower voltage levels. Relay i am using here is of 12v, i am using this one because its mostly used in projects. Relay module interfacing with pic16f877a microcontroller. Before interfacing, every one should know about the relay driver which is used to interface the relay to microcontroller.
Ssrs make interfacing with ac voltage really, really simple. Actually, we just control the coil portion of relay, so we send the signal to the relay coil. I have block diagram of microcontroller with pwm interfacing with relay through relay driver circuit. The input is taken from the microcontroller pins and the output corresponding to each input is given to the 5 relays on the output. Interfacing relay to microcontroller dna technology. Microcontroller interface to relays by uln 2003 youtube. When using these code samples it must be remembered that. In this tutorial im connecting one relay in port b. Jan 23, 2020 the pic 18 is a widely used microcontroller. In this project we will interface a relay with pic microcontroller pic16f877a and control a 220v ac lamp using the relay. How to turn on and turn off relay with pic microcontroller by using digital output ports of pic16f877a microcontroller. See the block diagram of driver circuit which i used in my project. Microcontroller interfacing circuits revolution revolution education ltd.
Interfacing pic microcontroller with st7735r spi tft mikroc. A relay can be easily interfaced with microcontroller using a transistor as shown below. This book is intended for use in collegelevel courses teaching microcontrollers and embedded systems. Relay provides isolation between two voltage levels and it is generally use to control ac appliances. Nov 02, 2012 relay interfacing with microcontroller. Microcontroller interfacing techniques document revision. This circuit is an example of interfacing a relay with a microcontroller using a transistor. From mechanical to solid state relays, there are various type of relays are available in.
Microcontroller may stop working by the negative voltages produced in the relay due to its back emf. There are many reasons for this, including the existence of massive support in both software and hardware by microchip technology. To understand how microcontroller works as a multifunctional relay it is necessary to know about microcontroller working, functions and its applications. Apr 24, 2018 this post shows how to use mikroc library for st7735r 1. In simple words, we attach any pin of the pic with one pin of relay coil and make the other pin to ground. Interfacing a relay with pic microcontroller mikroc. The maximum current that a pic microcontroller can source or sink is 25ma while a relay needs about 50 100ma current.
Please note although in audio it is said that the ic uln2003 has inverters it is partially correct. Microcontroller is a programmable digital processor with necessaryperipherals. Here i used diode d11n4148ws, resistor r1 1k, transistor t1 bc547, 12 v power supply and 6v relay. It should not be directly connected to a pic microcontroller. Electromechanical relays interfacing circuits with. Relay interfacing with microcontroller using uln2003a the. The pic 16f877a pic microcontroller is one of the most popular general purpose. 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. Using the microchip pic18 family as a reference, it explains the architecture of the computer and the pic18 microcontroller, discusses how to program in both assembly and in clanguage, and then provides a solid discussion of interfacing, complete with a diverse set of examples. There are two basic types of lcd modules in the market they are, character lcd and graphics lcd.
Transistor is wired as a switch which carries the current required for operation of the 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. Interfacing relay with pic microcontroller youtube. Aug 17, 2017 read switch relay using pic microcontroller normally a relay requires a pull in current of 70ma to be turned on. A relays is an electrical switch that opens and closes under control of another electrical circuit. In order to control devices, it is necessary to interface or connect them to the pic microcontroller. 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.
A relay is an electromagnetic switch which is used to switch high voltagecurrent using low power circuits. A relay is a switch which is used to switch high voltage or current using low power circuits. If the temperature exceeds the preset value, then microcontroller activates relay that will turn off the heaters and an av alarm will be generated if the system fails. 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. So our bc547 transistor will require enough base current to make sure it remains saturated and provide the necessary collector current i. This book provides a comprehensive look into the architecture, programming, and interfacing of the microcontroller. Pic microcontroller and embedded systems download pdf. Pic microcontrollers can be used as the brain to control a large variety of products. Read switch relay using pic microcontroller normally a relay requires a pull in current of 70ma to be turned on. Uln2803 is used as a driver for port io lines, drivers output connected to relay modules.
From mechanical to solid state relays, there are various type of relays are. Relay interfacing with microcontroller 8051 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. Peripheral interface controller pic is new to elec. If desired, the relay can be powered by a separate power supply, so, for. 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. In this project, pic microcontroller will be used to. Adc interfacing with 8051 microcontroller block diagram by. Relay interfacing with pic16f877a friendly free download as pdf file. Relay interfacing with pic microcontroller pic16f877a circuit digest. 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. A pic microcontroller is a single integrated circuit small enough to fit in the palm of a hand. Microcontroller interfacing to relays using uln2003, in this article, you will learn how to interface microcontroller to relays using uln2003 relay driver circuit.
This section will help to enable those with limited electronics experience to successfully complete these interfacing tasks. Programming with pic microcontroller research design lab. How to interface relay with pic16f877a pic development board. Interfacing of relay with microcontroller aticleworld. Relay interfacing with pic16f877a friendly pic microcontroller. In this project, pic microcontroller will be used to control and operate the tripping coil in circuit breaker. Here the heaters are represented with lamps for demonstration purpose. To control our high voltage device like home appliance by pic microcontroller, we have to have clear idea on interfacing relay with pic microcontroller. In the last two tutorials we learnt about what are relays and how they work.
Mar 02, 20 interfacing relay with pic microcontroller using transistor. A simulation of this example using proteus is provided at the end of the post. Download pic microcontroller and embedded systems pdf. May 21, 2016 automatic street light control using 8051 micro controller,keil ide and proteus simulation duration. The whole setup is shown in the block daigram of attached file. I have to choose the appropriate components for circuit design using the requirements mentioned.
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