The program given below is the hc05 bluetooth module interfacing with pic16f877a. Like my previous version, it also allows you to set both on and off times. Applications of interfacing devices with microcontroller. Interfacing eeprom with pic microcontroller i2c based. 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. This process is quite different from others since we are going to use android mobile to control and communicate with pic16f877a. Microcontroller may stop working by the negative voltages produced in the relay due to its back emf.
Microcontroller interfacing with different elements 4. I also cannot see how adding any resistors anywhere will increase the life of the relay. Interfacing a relay with pic microcontroller mikroc. Sd card interfacing with pic microcontroller udemy. In this project we will interface a relay with pic microcontroller pic16f877a. Plc programming is done using a standard ladder logic language. Embedded design by interactive simulation discusses microcontroller design and applications. Microcontroller interfacing to relays using uln2003, in this article, you will learn how to interface microcontroller to relays using uln2003 relay driver circuit. C devices by simply controlling the relay by giving 5v. Interfacing of relay,leds with pic microcontroller youtube. Before interfacing, every one should know about the relay driver which is used to interface the relay to microcontroller. This article describes a diy programmable relay switch using pic16f1847 pic16f628a can also be used microcontroller.
A relay is basically a switch which is operated electrically by electromagnet. In order to control devices, it is necessary to interface or connect them to the pic microcontroller. Relay i am using here is of 12v, i am using this one because its mostly used in projects. Interfacing a relay with microcontroller electronics. The software that is used for plc programming and ladder logic design is an open source compiler written by jonathan westhues.
Interfacing relay with pic microcontroller using transistor. Usb interfacing with pic microcontroller educational. 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. 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. 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. The clamp diodes are built in these relays driver ics and which eliminates. If you want to know more about relay driver circuit uln2003, relay working and relay interfacing with arduino check these articles. Relay module for arduino is one of the most powerful application for arduino as it can be used to control both a. Interfacing pic microcontroller with 7segment display mikroc projects. 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. Relay provides isolation between two voltage levels and it. Everything you wanted to know about usb interfacing but was too afraid to ask, or asked without. Sign up to get notified when this product is back in stock.
The transistor will be in off state when the when the pin p2. Its a 16 bit digital input and output programmable logic controller. A relay can be easily interfaced with microcontroller using a transistor as shown below. Adc interfacing with 8051 microcontroller block diagram by. Interfacing relay with 8051 slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. This video explains you about how to interface relay,leds and lamp with pic18 microcontroller and its proteus simulation. Here we are using pic microcontroller pic16f877a for interfacing rfid.
We can use seven relays with relay driver circuit using uln2003 and the relay driver circuit using uln2803 enables to use eight relays. Read and write to internal eeprom of pic microcontroller. First of all, i would like to tell about the desired. If you continue browsing the site, you agree to the use of cookies on this website. 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. In simple words, we attach any pin of the pic with one pin of relay coil and make the other pin to ground. Before going to the details of interfacing pushbutton switches with the pic, we shall discuss in brief about the types of switches. Relay interfacing with microcontroller using uln2003a. Display custom characters on lcd using pic microcontroller. Pic microcontrollers can be used as the brain to control a large variety of products. Microcontroller interfacing with different elements udemy. If we select a microcontroller without uart, we need to implement software uart. Code for relay interfacing with pic16f877a microcontroller.
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. Current flows from the 12v input to the relay and then to the ground via the transistors collector pin. To read the passive rfid cards and tag, we need a microcontroller with uart hardware. Part 1 introduces the pic 16f877 architecture, software, and simulation system. When microcontroller makes the output line high binary 1, the transistor is switched on. Current flows from the 12v input to the relay and then to. A relay can be used to switch higher power devices such as motors, light bulbs and solenoids. This chapter deals with the technicalities of push button interfacing with pic microcontroller.
Actually, we just control the coil portion of relay, so we send the signal to the relay coil. Displaying numbers, characters and the counter logic implementation. Often a need arise to interface output of the microcontroller with an electromagnetic relay emr. Interfacing pic microcontroller with 7segment display. An year ago i made a plc programmable logic controller using microchip pic microcontroller. Here is a simple microcontroller relay interface circuit with perfect galvanic isolation. Microcontroller boardscontrol the relay operations by using pic16f18f slicker board. Mplab xc8 for beginners tutorial 10 interfacing an. This section will help to enable those with limited electronics experience to successfully complete these interfacing tasks. When the pin rb7 of the pic microcontroller goes high, the transistor bc547 turns on and current flows through the relay. Led interfacing with pic microcontroller aticleworld. Lcd interfacing with microcontrollers the engineering.
Creating the suitable firmware to control high power device. Tutorial for beginners its a low cost usb interface board that provides cool interface to your computer and it can be used to control various devices like dc motor, stepper motor,servo, relay switch etc. In the circuit provided, the transistor is wired as a switch, which carries the current required for operation of the relay. One pin of microcontroller is used as a digital input pin and second pin is used as a digital output pin. Here the heaters are represented with lamps for demonstration purpose. Interfacing the uln2803 darlington driver ic to pic microcontroller 9. A microcontroller cant make any decisions on controlling something in the outside world without sensing something about it. A push button connected to the pic16f887 mcu is used to increment the displayed number. Interfacing pic microcontroller with st7735r spi tft.
Microcontroller interfacing to relays using uln2003 relay. When microcontrollers output port is in low state 0 no current flows to the base and the transistor is in off state. Relay module interfacing with pic16f877a microcontroller. A pic microcontroller is a single integrated circuit small enough to. To interface relay with microcontroller we need a driver circuit to drive the power to relay. Here the bluetooth module acts as an interface between our. A relay can be easily interfaced with microcontroller using a transistor. Relay provides isolation between two voltage levels and it is generally use to control ac appliances.
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. It is a revised version of my previous pic based relay timer project with added features and some improvements in the circuit design part. Microcontroller interfacing circuits revolution revolution education ltd. Relay interfacing with microcontroller 8051 microcontroller. Relays are devices which allow low power circuits to switch a relatively high current andor voltage onoff. How to interface relay with pic16f877a pic development board. Interfacing led with pic microcontroller is the very first tutorial in a series of tutorials on design embedded system with pic microcontroller. See the block diagram of driver circuit which i used in my project. Relay is a mechanical device to control high voltage, high current appliances on or off from lower voltage levels. Rfid interfacing with pic microcontroller pic16f877a.
Plc programmable logic controller with microchip pic. The coupon code you entered is expired or invalid, but the course is still available. Pic interface to control latching relays microchip. Interfacing of relay with microcontroller aticleworld. This section covers techniques to interface switches to a microcontroller. 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. Bluetooth module interfacing with pic microcontroller. 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. The above circuit represents the interfacing of pic microcontroller pic16f877a with relays using a relay driver circuit with uln2003. Relay interfacing with pic microcontroller pic16f877a.
Code for relay interfacing is written using mikor c for pic compiler. Interfacing relay with 8051 using transistor transistor is wired as a switch. 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. Bluetooth module interfacing with pic16f877a embetronicx. 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. In this tutorial im connecting one relay in port b. High power device handling using micro controller ports and implementing it using relay interface. 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. Here i used diode d1 1n4148ws, resistor r1 1k, transistor t1 bc547, 12 v power supply and 6v relay. Learn how to control a relay with a pic microcontroller to switch onoff high voltagecurrent loadappliances. Transistor is wired as a switch which carries the current required for operation of the relay.
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