Design and construction of digital multimeter using pic. Armature voltage is varied by pulse width modulation pwm of input dc voltage by using the developed microcontrollers program. Digital voltmeter using pic microcontroller project and circuit. Voltmeter and ammeter can be easily made using pic microcontroller having adc. The abbreviations ac and dc are often used to mean simply. In our lab i saw many dc power supply which have a variable knob to regulate the output. Pic, voltage sensing, voltage measurement, pic18f4520. Armature voltage is varied by pulse width modulation pwm of input dc voltage by using the developed microcontroller s program. We have mod lightings from a lot of vendors in the market. The main advantage in using a dc motor is that the speedtorque relationship can be varied to. Digital voltmeter using pic microcontroller project and.
Design and development of pic microcontroller based 3 phase energy meter thousif ahamed1, a. This ac voltage is converted into 5v dc using bridge rectifier and a 7805 type 5v regulator which can deliver current up to 1a. If you apply ac voltage as input, then will see the continuous running numbers on lcd as ac varies continuously. Where pic receives this voltage and displays the ac mains voltage on lcd by doing calculations. This paper is mainly concerned on dc motor speed control system by using microcontroller pic 16f877a. Microcontroller pic16f73 can be used instead of pic16f877a. Ac voltage measurement using pic16f877a microcontroller scribd. It explains how to monitor and sense the above parameters and isolate between the power line and microcontroller. Measuring battery voltage from microcontroller using adc. Voltage meter volt meter can measure dc voltages up to 50v. When the input voltage is 30v max the voltage across 20k ohm resistor becomes 5v which is feedback to the analog pin ra2 of the pic microcontroller. Frequency signal is obtained by using a frequency signal converter circuit.
Vdd and vss of the pic microcontroller is not shown in the circuit diagram. The microcontrollers generally operated and manufactured to work with voltage ratings less than or equal to 5v. Digital voltmeter using 8051 microcontroller this project measures the input voltage from 0v to 25v. The operating speed of the microcontroller is dc 20 m hz and clock input dc 200ns instruction per cycle. For engineers, pic microcontroller has been a godsend. You have came across many online tutorials on various websites about voltage measurement using different microcontrollers. Voltmeter and ammeter using pic microcontroller electrosome. Voltage measurement with a pic microcontroller ryan popa 03302012 design team 3 abstract the purpose of this application note is to explain how to measure a voltage using a pic18f4520 microcontroller. Motor speed sensing with pic microcontroller brandon upchurch. The difference amplifier or potential transformer is used to stepdown the voltage and then by using analog to digital converter or. Design of digital voltmeter for ac voltage measurement using pic.
I too am trying to measure current with a pic 18f2520 using a 0. Temperature meter temperature meter can use between 0 c to 150 c. The pic18f4520 uses a 5v dc power source and communicates with a computer through a rj11. We compiled a list of 20 pic microcontroller projects ideas for electronics engineers. In my country, we have 220 volts ac at domestic level. May 20, 2012 when the input voltage is 30v max the voltage across 20k ohm resistor becomes 5v which is feedback to the analog pin ra2 of the pic microcontroller. Current can be measured by measuring the voltage across a resistor. I think the pic will have a hard time distinguishing between 1 mv and noise. Top 20 pic microcontroller projects pic microcontroller. Digital dc power supply using pwm with pic microcontroller.
The input offset voltage should be very less relative to the operating voltage range of the op amp. Pic microcontrollers the basics of c programming language. For this reason, the harvard architecture microcontrollers is much faster. Power measurement is done for both ac circuits and dc circuits. Once the rectification is done the voltage under measurement should be given to the specified adc channel pin of the microcontroller, since our pic microcontroller is having internal adc. Since the pics ad can only measure positive values, a dc level must be added to the signal, so as not to lose the negative portion. Hello, i am new to microcontrollers and am making a project to read ac mains voltage using pic microcontroller pic 16f72. Most often this is the choice of microcontroller for project implementation. In direct current dc, also dc, the flow of electric charge is only in one direction.
It is usually of the order of 80 db in a typical op. To carry out the design consideration and production of a useful consumer product of pic microcontroller. The objective of developing this project is to control the speed of dc motor. An1747 operational amplifier applications using 8bit.
In pic 16f877a contains data memory eeprom up to 256. This voltage measurement example can measure maximum of 50 volts, it is useful for measurement of solar voltage, dc adapter or battery voltages. Ac power measurement meter using pic microcontroller. Pdf microcontroller based dc motor speed control using pwm. Three phase voltage measurement using pic microcontroller. Arduino ac voltmeter project with code and circuit diagram. Dc voltage measurement using atmel avr microcontrollers. So, i bought a 220v6vtransformer to step down the voltage to the minimum level. The current and voltage single are acquired from the main ac line by using current transformer and potential transformer.
Motor speed sensing with pic microcontroller brandon. Ac voltage measurement using pic16f877a microcontroller. Pic 16f876 microcontroller, seven segment display, ac to dc conversion, voltage. A microcontroller reads the width digitally and displays the corresponding dc input voltage to the user after engineering conversion through the rs232 port of a legacy machine. Ac voltage measurement using pic all about circuits. Complete arduinovoltmeter code is given at the end of this project and it is well explained through the comments. I am using this below circuit to measure ac voltage using a pic microcontroller pic32mx330f064h. Isolated current and voltage measurement using fully differential isolation amplifier design overview design features this ti design demonstrates using the amc1100 voltage and current measurement using. A dc dc converter is normally chosen because of its high efficiency in converting the input power to output power.
You must convert the ac signals to propotional dc signals with the help of recti. Here in this circuit resisitor r1 and r2 form a voltage divider to attenuate the ac line voltage. Adc function based on pwm technique electronic design. Digital voltmeter voltmeter is an electrical measuring instrument which is used to measure both ac and dc voltage. But i will give you a method through which you can do this job just like 1 2 3. The ac voltage measurement using pic microcontroller can be done using a difference amplifier or potential transformer.
Hence, it is required to step down the high ac voltage around 230v to 5v for measuring voltage using microcontrollers. In this project we are going to make our own digital ammeter using pic16f877a microcontroller and current sensor acs7125a. The main part of this ac voltmeter project are 1 converting circuit for converting ac to dc in range of 05v 2 adc interfacing10 bit inbuilt adc of 16f676 3 7 segment multiplexing. Ac voltage to dc by rectifying it through fullwave rectification. College of engineering, bangalore, indias1,2 abstract the purpose of this project is to develop a 3phase energy meter, using dspic33f microcontroller and mcp3909. Simulation is performed for various voltages between 220 r. Arockia edwin xavier thiagarajar college of engineering,electrical and electronic engineering madurai,tamil nadu email. This system is to measure ac dc voltage, current, diodes, temperature, connectivity, frequency and resistance using pic microcontroller. But i am unable to find the circuit to step down the ac voltage to dc and that too to the max. Ac voltage measurement using atmega8 engineer experiences. Ac voltage measurement using microcontroller electrical. A system was designed and built to detect the speed and acceleration of a dc motor. The simplest way of doing this is to place a resistance in series with the current path and measure the voltage drop across it. First we will know about ac voltage parameters, then we will do the whole work step by step.
Mar 24, 2016 ac alternating current measurement using pic16f877a microcontroller. If you want to measure ac signals with the help of microcontroller there are 2 ways. Simulating ac 285 rms voltage using ac arduino voltmeter. Here, we will look on the measurement parts of dc voltage using atmel avr micro controllers. Resisitor r3 and r4 acts a level shitfer so that the ac signal zero level is shifted to mid voltage level of the dc 3. The voltage is sensed by using the step down transformer and voltage divider circuit. The system architecture of a digital voltmeter dvm is. Design and development of pic microcontroller based 3. See more ideas about pic microcontroller, electronics projects and electrical projects. Interfacing dc motor with pic microcontroller using l293d. There are many different methods to measure the voltage.
The control algorithm of the brushless dc motor is implemented on lpc1549 microcontroller, using a hardware event driven state machine. There are lot of blogs present on the internet explaining adcs. Microcontroller based electrical parameter monitoring. This algorithm runs on a state configurable timer peripheral. Oct 06, 2018 digital voltmeter using 8051 microcontroller this project measures the input voltage from 0v to 25v. Mar 06, 2016 in this video will learn how to design digital current voltmeter using voltage divider and difference amplifier method, how to write code using mikro c and pic. Power can be measured by using different methods namely.
Aug 05, 2016 hi, i need help to design a circuit which receives the voltage from ac mains i. The current is measured with the help of an acs 712 current sensor. The difference amplifier or potential transformer is used to stepdown the voltage and then by using analog to digital converter or rectifier the voltage reading is displayed on lcd display. Measurement, monitoring of dc voltage and frequency of a. Each and every microcontroller has adc that is designed to process dc signals. If you have the knowledge of adcs then you can easily measure the voltage.
An1747 operational amplifier applications using 8bit pic mcus. Cmx881 51f8 pic16lf877 programming ramp voltage with pic microcontroller analogue multimeter um8810 ev8810 tp10 electret mic terminals text. Usually pic adc can measure up to rail voltage when using vdd as reference, so you will have to make sure that the voltage to be measured is always between 0 vdd volts. Design and development of pic microcontroller based 3 phase. As i am not an industrial level expert so this project is just about a digital dc power supply of small range5v12v. Oct, 2016 ac voltage measurement using atmel avr microcontrollers. To prevent more than 5 volts appearing across the pic microcontroller. Unlike a linear regulator, the efficiency measure of a dc dc converter generally increases as its load increases. Pdf a digital speed control application on the universal. Design of digital voltmeter for ac voltage measurement using.
For measuremnt of ac current you have to meausre peak value of sine wave you can find for more information visit this link category. This system was designed to try to test the applications of a pic chip processor. Mamatha c g, asst professor department of electrical and electronics engineering gsss institute of engineering and technology for women mysore, india abstract. There are two types of voltmeter available for the purpose voltage measurement i. Pdf microcontroller based dc motor speed control using. Digital voltmeter using a pic can read the voltage from 040 volt.
In this project, you will learn how to measure high ac voltage using pic16f877a micrcontroller. Isolated current and voltage measurement using fully. This means a dc current can be indirectly measured by a microcontrollers adc channel by first converting the current into voltage. Measuring the voltage and current will always be helpful while making or debugging any electrical system. Ac voltage measurement using pic microcontroller and opamp. Digital ac voltmeter can also be designed using microcontrollers. Sep 10, 2015 each and every microcontroller has adc that is designed to process dc signals.
Block diagram of standalone data logger using pic microcontroller 2. Ac alternating current measurement using pic microcontroller. So, it is not possible to directly measure ac voltage greater than 230v by giving high input voltages to microcontrollers which may cause temporary or permanent damage to microcontrollers. The projects range from alarm clock to implementing iot ideas. Construction of microcontroller based digital voltmeter. A voltage divider circuit is used to divide voltage into two parts. Feb 14, 2017 pic 16f676 microcontroller is used in this circuit. This project can measure both ac and dc current with a range of 030a with an accuracy of 0. When the voltage and current are periodic with the same fundamental frequency, the instantaneous power is also periodic with twice the fundamental frequency. Accordingly, the program is divided in four parts that you have to go through as per the following order.
Digital dc voltmeter is designed to measure dc voltage using the pic16f877a microcontroller. Digital dc watt meter project using pic microcontroller. Design of digital voltmeter for ac voltage measurement. I was dreaming to make such a project where i can regulate the voltage using push button. 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. The microcontroller uses its ad converter to convert this voltage analogue value to a number digital value which is then sent to the lcd display via several conductors. A properly designed dc dc converter can yield an efficiency measure of greater than 90% at full load. In this voltage measurement example we are measuring voltage of the dc 9v battery, you can connect any dc source to red and black wires. Ac voltage measurement using pic microcontroller the microcontrollers generally operated and manufactured to work with voltage ratings less than or equal to 5v. Dcdc converter controller using a picmicro controller. In alternating current ac, also ac, the flow of electric charge periodically reverses direction. Ac alternating current measurement using pic16f877a microcontroller. Same as current rating, buy a transformer with minimum secondary voltage.
Measure current using pic microcontroller all about circuits. This note will start by explaining how to correctly power and wire the microcontroller for sensing voltage. Sreedevi2 department electrical and electronics engineering, r. Unlike a linear regulator, the efficiency measure of a dcdc converter generally increases as its load increases. This time we will see how to measure ac voltage parameters with the help of microcontroller. Microcontroller pic 16f877a as we see from the figure the microcontroller used is pic 16f877a. Voltage measurements are easy tasks through a microcontroller. A properly designed dcdc converter can yield an efficiency measure of greater than 90% at full load. Mar 15, 2017 dc voltage measurement using the with pic microcontroller 1. I want to measure current as small as 10 ma from a small solar panel, which would give a voltage of 0. This system is to measure acdc voltage, current, diodes, temperature, connectivity, frequency and resistance using pic microcontroller. A dcdc converter is normally chosen because of its high efficiency in converting the input power to output power.
Voltage measurements are easy tasks through a micro controller. Microcontroller base automatic controlling of power factor with load monitoring is shown in fig. But all these tutorials are about measurement of low dc voltage. At the same time, the maximum amplitude must be kept within the ads reference levels, which could be done using a resistive divider. The practical issues can be different based on how much voltage and current you plan to measure. Digital ammeter circuit using pic microcontroller and acs712. Here, the input voltage should be dc voltage to get the accurate output on lcd. Digital voltmeter using 8051 microcontroller electronics hub. Main components of the system were a singlechip microcontroller, a phototransistor and emitter, and a comparator.
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