Relay module interfacing with pic16f877a microcontroller. Relays are devices which allow low power circuits to switch a relatively high current andor voltage onoff. This post shows how to interface pic16f887 microcontroller with 7segment display in order to build a simple 4digit counter which counts from 0 to 9999. Rfid interfacing with pic microcontroller pic16f877a. A relay can be easily interfaced with microcontroller using a transistor. Before going to the details of interfacing pushbutton switches with the pic, we shall discuss in brief about the types of switches. In this tutorial im connecting one relay in port b. In simple words, we attach any pin of the pic with one pin of relay coil and make the other pin to ground. How to interface relay with pic16f877a pic development board.
The transistor will be in off state when the when the pin p2. The clamp diodes are built in these relays driver ics and which eliminates. In case you are new to pic microcontroller and mplab x ide i strongly suggest to visit the tutorial getting started with mplab x ide. You could try replacing the relay coil with a 200 ohm resistor to simulate the relay coil to see if the transistor will drive the current. 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.
The software that is used for plc programming and ladder logic design is an open source compiler written by jonathan westhues. If you want to know more about relay driver circuit uln2003, relay working and relay interfacing with arduino check these articles. The program given below is the hc05 bluetooth module interfacing with pic16f877a. Before interfacing, every one should know about the relay driver which is used to interface the relay to microcontroller. Relay interfacing with pic microcontroller pic16f877a. The ones that i am looking at can be powered and controlled from a supply as low as 12v, while the relay contacts are rated for 16 amps at 250v ac. 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. This section covers techniques to interface switches to a microcontroller. In this project we will interface a relay with pic microcontroller pic16f877a. Microcontroller interfacing with different elements udemy. Relay interfacing with microcontroller using uln2003a. Interfacing of relay,leds with pic microcontroller youtube.
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. This video explains you about how to interface relay,leds and lamp with pic18 microcontroller and its proteus simulation. Pic interface to control latching relays microchip. If you continue browsing the site, you agree to the use of cookies on this website. Like my previous version, it also allows you to set both on and off times. A relay can be used to switch higher power devices such as motors, light bulbs and solenoids.
Interfacing relay with pic microcontroller using transistor. Plc programming is done using a standard ladder logic language. This chapter deals with the technicalities of push button interfacing with pic microcontroller. Current flows from the 12v input to the relay and then to the ground via the transistors collector pin. I also cannot see how adding any resistors anywhere will increase the life of the relay. Actually, we just control the coil portion of relay, so we send the signal to the relay coil. Transistor is wired as a switch which carries the current required for operation of the relay. Embedded design by interactive simulation discusses microcontroller design and applications. Microcontroller interfacing circuits revolution revolution education ltd.
Interfacing pic microcontroller with st7735r spi tft mikroc projects this post shows how to use mikroc library for st7735r tft with pic16f887 microcontroller where hardware spi module of the pic16f887 is used in this example. Here we are using pic microcontroller pic16f877a for interfacing rfid. Relay i am using here is of 12v, i am using this one because its mostly used in projects. Relay provides isolation between two voltage levels and it. In order to control devices, it is necessary to interface or connect them to the pic microcontroller. When microcontrollers output port is in low state 0 no current flows to the base and the transistor is in off state. See the block diagram of driver circuit which i used in my project. When the pin rb7 of the pic microcontroller goes high, the transistor bc547 turns on and current flows through the relay. Microcontroller interfacing with different elements 4. Microcontroller may stop working by the negative voltages produced in the relay due to its back emf. Relay module for arduino is one of the most powerful application for arduino as it can be used to control both a. Lcd interfacing with microcontrollers the engineering. Sign up to get notified when this product is back in stock. Interfacing pic microcontroller with 7segment display mikroc projects.
In the circuit provided, the transistor is wired as a switch, which carries the current required for operation of the relay. An year ago i made a plc programmable logic controller using microchip pic microcontroller. Microcontroller interfacing to relays using uln2003, in this article, you will learn how to interface microcontroller to relays using uln2003 relay driver circuit. It is a revised version of my previous pic based relay timer project with added features and some improvements in the circuit design part. Interfacing led with pic microcontroller is the very first tutorial in a series of tutorials on design embedded system with pic microcontroller. One pin of microcontroller is used as a digital input pin and second pin is used as a digital output pin. Interfacing a relay to a 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.
A relay is basically a switch which is operated electrically by electromagnet. To interface relay with microcontroller we need a driver circuit to drive the power to relay. Applications of interfacing devices with microcontroller. We can use seven relays with relay driver circuit using uln2003 and the relay driver circuit using uln2803 enables to use eight relays. Plc programmable logic controller with microchip pic.
A relay can be easily interfaced with microcontroller using a transistor as shown below. This process is quite different from others since we are going to use android mobile to control and communicate with pic16f877a. Adc interfacing with 8051 microcontroller block diagram by. Part 1 introduces the pic 16f877 architecture, software, and simulation system. Interfacing of relay with microcontroller aticleworld. Creating the suitable firmware to control high power device. Here i used diode d1 1n4148ws, resistor r1 1k, transistor t1 bc547, 12 v power supply and 6v relay. First of all, i would like to tell about the desired. Pic interface to control latching relays i am designing a way of controlling lighting zones in the house we are building and am considering latching relays for the basic switching.
Interfacing relay with 8051 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. When microcontroller makes the output line high binary 1, the transistor is switched on. Interfacing eeprom with pic microcontroller i2c based. Interfacing pic microcontroller with 7segment display. Bluetooth module interfacing with pic microcontroller. A microcontroller cant make any decisions on controlling something in the outside world without sensing something about it. Relay is a mechanical device to control high voltage, high current appliances on or off from lower voltage levels. Pic microcontrollers can be used as the brain to control a large variety of products. Interfacing a relay with pic microcontroller mikroc. Current flows from the 12v input to the relay and then to. Sd card interfacing with pic microcontroller udemy. Displaying numbers, characters and the counter logic implementation. Code for relay interfacing with pic16f877a microcontroller. Everything you wanted to know about usb interfacing but was too afraid to ask, or asked without.
Here the bluetooth module acts as an interface between our. If we select a microcontroller without uart, we need to implement software uart. Here in the tutorial, lcd interfacing with microcontrollers, i will tell you about the configuration of the lcd, its pins specifications and about the procedure to interface it with different microcontrollers e. Microcontroller boardscontrol the relay operations by using pic16f18f slicker board. Interfacing relay with 8051 using transistor transistor is wired as a switch. Microcontroller interfacing to relays using uln2003 relay. Interfacing pic microcontroller with st7735r spi tft.
Often a need arise to interface output of the microcontroller with an electromagnetic relay emr. I hooked up the relay to the same 5v that power up my pic with the appropriate transistor, diode, voltage to power up an led to nc and led to no, i hooked up an lm35tempreature sensor to my pic and an lcd to check what is going on, i wrote my code and everything is working perfectly. Mplab xc8 for beginners tutorial 10 interfacing an. A pic microcontroller is a single integrated circuit small enough to.
Interfacing a relay with microcontroller electronics. Here the heaters are represented with lamps for demonstration purpose. A push button connected to the pic16f887 mcu is used to increment the displayed number. The coupon code you entered is expired or invalid, but the course is still available. Bluetooth module interfacing with pic16f877a embetronicx.
Led interfacing with pic microcontroller aticleworld. Here is a simple microcontroller relay interface circuit with perfect galvanic isolation. Interfacing of relay with microcontroller relay is an electromagnetic switch, which generally use in industries and houses to control the different machine and appliances like a lamp, water pump, road light ac compressor etc. Relay interfacing with microcontroller 8051 microcontroller. High power device handling using micro controller ports and implementing it using relay interface. Its a 16 bit digital input and output programmable logic controller. C devices by simply controlling the relay by giving 5v. To read the passive rfid cards and tag, we need a microcontroller with uart hardware. Relay provides isolation between two voltage levels and it is generally use to control ac appliances. Read and write to internal eeprom of pic microcontroller. The above circuit represents the interfacing of pic microcontroller pic16f877a with relays using a relay driver circuit with uln2003. Usb interfacing with pic microcontroller educational. Relay interfacing with microcontroller a relays is an electrical switch that opens and closes under control of another electrical circuit.
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