Starting from the alarm clock that wakes you up and the toaster that serves. To display numeric values we can use seven segment displays. The interfacing circuits can also be used with any pic microcontrollers such as the pic16f84, although these microcontrollers may require programming in assembler code. The pic 16f877a pic microcontroller is one of the most popular general purpose.
It is a very simple and easy to understand project for the beginners and is commonly used in several electronic products. In the earlier tutorials, we saw how to interface the leds to pic microcontroller and wrote the code to blink them. Interfacing lcd and keypad are one of the important interfacing concepts of pic microcontroller since both the input and output element can form a complete embedded system design. Connecting switch by vcc and mcu sw1 detecting switch by logic 1 at port pin when switch is pressed here pin 0 of port 0. Rb0int external interrupt flag bit 1 the rb0int external interrupt occurred must be cleared in software 0 the rb0int external interrupt did not occur.
This section discusses an example of sevensegment display interfacing with pic16f877a microcontroller using mikroc for pic compiler. Vdd and vss of the pic microcontroller is not shown in the circuit diagram. Interfacing with pic microcontrollers part 4 besides led and 7segment display, lcd is another useful device to show programs current state, to give instructions, for debugging and so. Programming a pic microcontroller page 10 of 24 the last window in the project wizard is a summary of the options you have selected. After hitting finish you will be presented with a dialog window asking you to save your workspace. Jun 12, 2018 in this project we will interface a relay with pic microcontroller pic16f877a. Gsm interfacing with pic microcontroller pic16f877a make. To control the relay we will use bc547 npn transistor and. Connecting switch by gnd and mcu sw2 detecting switch by logic 0 at port pin when switch is pressed here pin 1 of port 0. The datasheet of pic16f877a microcontroller and more detailed features can be found at the bottom of this page. In todays post, i am going to share how to interface lm35 with pic microcontroller. If everything looks ok hit finish to create the project. Pdf this paper describes the implementation of a pic microcontroller in a conventional laboratorytype. The connection diagram for interfacing gsm module with pic microcontroller is shown below.
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 pic microcontroller pic16f877a. In this tutorial we will see how to read the status of an input pin which is connected to a push button switch. Interfacing adc to display analog to digital conversion values on lcd. Functional description of pic16f877a functions and interfaces.
Complete circuit for connecting relay with pic microcontroller is given below in the above schematic pic16f877a is used, where on the port b the led and transistor is connected, which is further controlled using the tac switch at rbo. After the preset time duration, the timer automatically switches off, disconnecting the appliance from the power supply. When the op of lm358 goes high, then led connected at the op turns on. The digital revolution started in 1950 changes all the existing mechanical and analog electronic structures into digital computers. If you want to switch the hx711 to channel b input with gain of 32, send 1 clock. Since the growth of digital electronics has been exponential, today it is almost impossible for a person to resist using any electronic equipment. Functional description of pic16f877a functions and. Pic16f877a microcontroller based digital alarm clock. Lesson 9 interfacing keypad with pic microcontroller mikroc keypad finds its application where there is need for the user to enter alphanumeric inputs. I have already shared interfacing of lm35 with arduino so now we are gonna interface this same temperature sensor with pic microcontroller. Lcd interfacing with pic microcontroller mplab xc8 and. This will establish a serial connection between both. Interfacing hcsr04 ultrasonic rangefinder with pic 16f877a microcontroller dht11 humidity sensor interface with pic16f877a p10 rg led display interface with stm32f030f4 32bit mcu.
Lesson 9 interfacing keypad with pic microcontroller mikroc. Rb port change interrupt flag bit 1 at least one of the rb7. Jul 19, 2018 pic16f877a datasheet pdf microcontrollers microchip, pic16f877a pdf, pic16f877a pinout, pic16f877a data, circuit, output, ic, pic16f877a schematic. X10 home automation using the pic16f877a microchip.
May 07, 2012 this article is meant for beginners in the field of microcontrollers. So in this section we will take a short side step from the business of concepts and theories to tea. Ldr sensor interfacing with pic16f877a embetronicx. Also, so do not forget to common ground both the gsm and pic module. Interfacing lm35 temperature sensor with pic microcontroller. Using push button switch with pic microcontroller mplab xc8. Irsensor circuit and interfacing with pic microcontroller. Unlike all conventional motors, a stepper motor advances in steps.
Martin bates has drawn upon 20 years of experience of teaching microprocessor systems to produce a book containing an excellent balance of theory and practice with numerous. Pic16f877a interfacing with switch and led youtube. Although the maximum part of code remains the same, the only difference is compiler setting and how to create a new project. Since we changed pic16f84 to pic16f877a, were having trouble on how to interface the mq2 sensor with pic16f877a help me guys please thanks. Pic, pic16f87x, pic16f877, mplab, mpasm, incircuit debugger, in. How to interface relay with pic16f877a pic development board. Stepper motor using pic microcontroller,in this tutorial, you will learn to interface a stepper motor with pic16f877a microcontroller.
Interfacing pic16f877a with lm35 temperature sensor c code. Interfacing seven segments with pic16f877a tutorials. Interfacing seven segments with pic16f877a in the earlier tutorials, we saw how to interface the leds to pic microcontroller and wrote the code to blink them. The c code below was tested with ccs pic c compiler version 5. Interfacing pic16f877a microcontroller with 3wire lcd. The pic16f877a microcontroller is the heart of the entire system. Reading voltage quantity using the adc gives us a number between 0 and 1023 10bit resolution, 0v is represented by 0 and 5v is represented by 1023. Pic16f877a datasheet pdf microcontrollers microchip, pic16f877a pdf, pic16f877a pinout, pic16f877a data, circuit, output, ic, pic16f877a schematic. Pin diagrams 10 pic16f873a876a 11 2 3 4 5 6 1 8 7 9 12 14 15 16 17 18 19 20 23 24 25 26 27 28 22 21 mclr.
Ic lm358 is used as a comparator when ir receiver senses ir radiations. When the pin rb7 of the pic microcontroller goes high, the transistor bc547 turns on and current. This tutorial assumes you have basic knowledge about programming pic microcontroller, else. A pic microcontroller is a single integrated circuit small enough to fit in the palm of a hand. Rb4, rb5, rb6 and rb7 are connected across lcds 4 pin d4, d5, d6, d7. Hello friends, i hope you all are fine and having fun with your lives. This article is meant for beginners in the field of microcontrollers. We can drive two dc motors with one l293d, in this example we are using only the first pair of drivers to drive one dc motor. This powerful 200 nanosecond instruction execution yet easyto. However, the leds cannot be used to display any user information like numbers, chars etc. Microcontrollers have become very useful in embedded design as they can easily communicate with other devices, such as sensors, switches, lcd displays, keypads, motors and even other microcontrollers. Learn to read a switch with pic microcontroller studentcompanion. We couldnt wait to show you how much fun it is to make the microcontroller interact with real physical devices.
Operation we can interface a switch to microcontroller by two way as shown in above image. Miscellaneous pic microcontroller projects timecontrolled switch. Top 20 pic microcontroller projects pic microcontroller. In this tutorial we will see how to configure the pic gpios pins and then control the leds using the switches. Interfacing led and switch with pic16f877a tutorials. That means they give a voltage output that varies directly and linearly with the sensed quantity. The switches are shown as little open circles in figure 8. Pic16f877a datasheet pdf microcontrollers microchip. Ir sensor circuit interfacing with pic18f4550 microcontroller. The reference manual should be considered a complemen. The following image shows project circuit schematic. Relay is used in all the home automation projects to control the ac home appliances circuit diagram. Uln2803 is used as a driver for port io lines, drivers output connected to relay modules.
Interfacing devices with pic microcontroller studentcompanion. Interfacing relay with pic microcontroller using transistor. It would see each of the short pulses as individual switch openings and closures. The software part consisting of the lcd library for pic, its setup and use with mplab x ide and xc8 compiler are described in a separate article.
Interfacing lm35 with pic isnt much difficult as its a simple sensor which gives us analog. Programming with pic microcontroller research design lab. Lcd module interface with pic16f877a extreme electronics. Peripheral interface controller pic is new to elec.
It takes the inputs from the lm35 temperature sensor to measure the current room temperature, and then the microcontroller will respond to control the required fan speed. The output pin of the ic lm358 is used to interface with pic microcontroller. Pdf design and implementation of electronic control trainer with. This powerful 200 nanosecond instruction execution yet easytoprogram only 35 single word instructions cmos flashbased 8bit microcontroller packs microchips powerful pic architecture into an 40 or 44pin package and is upwards compatible with the pic16c5x, pic12cxxx and pic16c7x devices. R2 is a pulldown resistor, used across tactile switch. This tutorial assumes you have basic knowledge about programming pic microcontroller, else you read the article. To interface lcd with pic16f877a and display the text lcd interface on it.
In a normally open switch no, the resistance between the connections is infinite over 100 m. Pic16f87xa ds39582bpage 2 2003 microchip technology inc. Microcontroller boardscontrol the relay operations by using pic16f18f slicker board. Additional information may be found in the pic mcu midrange reference manual ds33023, which may be obtained from your local microchip sales representative or downloaded from the microchip website. Pic16f877a interrupt tutorial external, timer, uart intr. In this project we will interface a relay with pic microcontroller pic16f877a. The shift register data line is connected to rb0 pin and the clock line is connected to rb1 pin. An io expander can also be used to monitor switches. Use the manufacturers datasheet to determine the pinout. Devices like a small light bulb, a buzzer and so on can be powered by the transistor that we learnt in section 7. I am interfacing a 3x4 keypad to pic16f877a uc on portd as.
Relay is a mechanical device to control high voltage, high current appliances on or off from lower voltage levels. It will provide logic 0 when the switch is not pressed. Lcd interfacing with pic microcontroller, in this tutorial, you will learn to interface an lcd with a microcontroller. The are many cool sensors available now a days, ranging from ir distance sensor modules, accelerometers, humidity sensors, temperature sensors and many many moregas sensors, alcohol sensor, motion sensors, touch screens. The current passing through this circuit should be less than the maximum current. Interfacing lcd and keypad with pic16f877a microcontroller. Pic16f877a gpio tutorial lcd interfacing with pic16f877a pic16f877a adc tutorial components required pic16f877a development board ldr. Using push button switch with pic microcontroller mikroc. Pic 16f877a has the following 15 interrupt sources. To interface and control them with pic microcontroller, we use gpio pins as digital output pins. A relay can be easily interfaced with microcontroller using a transistor as shown below. In this tutorial we are going to see ldr sensor interfacing with pic16f877a. We have simply interfaced the tx and rx pins of the gsm module with the rx and tx pins of the pic mcu pic16f877a respectively. Jan 29, 2016 hello friends, i hope you all are fine and having fun with your lives.
Flowcode beginners tutorial 5 connecting a switch to a pic microcontroller. Relay module interfacing with pic16f877a microcontroller how to interface ac load. P0 goes high and low a number of times when the switch is first closed. Aug 28, 2015 step by step learning of basics of programming a pic16f877a microcontroller in mplabx ide. Im having trouble in interfacing the mq2 sensor with pic16f877a because our original schematic diagram has an ad converter. The required components of photo infrared sensor include ir receiver tsff5210, photodiode, 100 ohm resistor, 10k resistor, 10k variable resistor and lm358 ic. In the above schematic pic16f877a is used, where on the port b the led and transistor is connected, which is further controlled using the tac switch at rbo. Servo motor control by using microcontroller pic16f877a. In this tutorial, well consider how a matrix keypad is interfaced with a pic microcontroller. From mechanical to solid state relays, there are various type of relays are available in. Transistor is wired as a switch which carries the current required for operation of the relay. How to interface leds with pic16f877a pic development board. This article describe the hardware setup required for interfacing hd44780 based alphanumeric lcd modules with a pic16f877a microcontroller. C drives a set of 8 leds through resistors to allow the pic to send out.
In the first half of the c program i have set first four pins to input from lsbrd0 and others to output and store the value in a variable and in other half i have set last four pins to input and others to output and stored its value into another variable i have called this function in a continuous loop to get a pressed key. If the switch is used for counting events, the microcontroller count would be many times the true number of events. A stepper motor is a kind of a motor that converts electrical pulses into mechanical movement. In this tutorial we will see how to configure the pic gpios pins and then control the leds using the switches in this tutorial we will be using pic16f877a as reference, same will be applicable for other pic series controllers. Basic tutorials to get you started in the world of microcontrollers. Mar 29, 2019 the digital revolution started in 1950 changes all the existing mechanical and analog electronic structures into digital computers. Schematic diagram of microcontroller connections to the antenna positioners and rf switches that it controls. Jul 06, 2015 the output pin of the ic lm358 is used to interface with pic microcontroller. The circuit on figure 18 below shows a buzzer interfaced to a pic. Relay module interfacing with pic16f877a microcontroller ac load.
Here we use pic microcontroller 16f877a and mikroc pro compiler. Introduction to standard interfacing circuits output device interfacing input device interfacing. Prerequisites before start this tutorial we should know below topics. If you want to switch to channel a input with gain of 64, send 1 more clock. The output of the infrared sensor circuit is connected to pic microcontroller pins and the microcontroller will take it as digital input either 0 or 1. Step by step learning of basics of programming a pic16f877a microcontroller in mplabx ide. Lcd liquid crystal displayprovides user interface and can be very useful for debugging purpose. Relay provides isolation between two voltage levels and it is generally use to control ac appliances. Relay is an electromagnetic switch which is controlled with a small current.
Relay interfacing with pic microcontroller pic16f877a circuit digest. When the coil is energized, the switch closes, connecting the two contacts together. Seven segment display interfacing with pic using mikroc pro compiler. A timecontrolled switch is an automatic timer switch that turns an appliance on for the desired time duration. Automatic fan speed control using pic16f877a microcontroller. 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. Aug 28, 2017 interfacing pic16f877a with lm35 temperature sensor c code.
This circuit can be used to interface with pic microcontroller. This chapter deals with the technicalities of push button interfacing with pic microcontroller. A microcontroller operates thousands of times faster than a mechanical switch. Interfacing dc motor with pic microcontroller using l293d. Interfacing pic microcontrollers, 2nd edition is a great introductory text for those starting out in this field and as a source reference for more experienced engineers.
In the last tutorials, we have seen how to use mplab xc8 compiler and how to interface an led with pic microcontrollers such as pic16f877a and pic18f4550. Now we are going to see pic16f877a interrupt tutorial. More detail on the positioner and switch controllers are shown in figures 3 through 5. Jun 12, 20 this article describe the hardware setup required for interfacing hd44780 based alphanumeric lcd modules with a pic16f877a microcontroller. The 1n4007 is a clamp diode, used for the relays electromagnetic coil. Interfacing the mcp23016 io expander with the pic16f877a. When i started with microcontrollers, as everyone i also need to learn how to interface a switch with microcontroller. Eb024302 eb024002 00809094ba05 circuit diagram of lcd connection to pic 16f877a microcontroller interfacing with lcd pic16f877a free projects of led pic16f877a free projects of lcd pic16f877a free.
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