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ADC Value Fluctuating in PIC Voltmeter and Ammeter LCD PIC16F877A

Hello, I tried to made Digital voltmeter and Ammeter Here's the Circuit Problem's M Facing:- 1) Voltage and Current both values fluctuating..constantly... 2) Not measuring the voltage or currre

VOLTMETER using pic18f4550....Help needed

adcON1=0xCE; // Make RA0/AN0 pin as analog pin (Other pins remain to be digital I/O) You are using RC0 as your adc input and configured RA) for adc input. Make the changes. You have connected RA0 to LCD.

AC voltmeter required

u have to reduce the voltage by using some optocouplers and send the voltage to adc of mcu the output of optocoupler will be the working voltage of MCU take that as scaled voltage If your 0-5 volts at mcu pin is scaled and the actual range = 0-20v then 5 = 20 so 1v scaled = actual 4v Your adc will produce 1023 raw value for 5v i.e., 20v actual

i need ac 0 to 400v above pic voltmeter

You need to rectify the AC input to get a DC value that is going to be approx. the peak value of the AC input. As this value is very high, place a voltage divider to suit the range of the adc inputs of the micro controller. Take care with the voltages that you are handling. The peak voltage will be more than 560v. Standard resistors do not withsta

Calibration source for differential 24bit ADC.

Precision calibration of an adc can be done with a Kelvin Varley Divider, like the fluke 720A. Another way is by using a very good voltmeter with 6 1/2 digit accuracy. As the Fluke 8846A. None of this solutions is cheap. By the way 24bit is more than necessary for the required .02%. Hope that it helps

adc math help for ac voltmeter?

I have a pic 16f73 based ac volt meter.the volts on adc pin vary from .87v to 1.58v the respective lcd display is from 170v to 230v. .87v=170v .93v=175v .99v=180v 1.05v=185v 1.11v=190v 1.17v=195v 1.23v=200v and so on.i am unable to understand adc math for this conversion.can any one explain it.Vref = Vdd in the circuit.

how to make voltmeter without micro controller ??

how can i make voltmeter with adc0808 without micro controller this is my project in my collage !!! can anyone help me ?!! thx in advance :!:

1000V AC Voltmeter needed.

Here is an adc project I did using pic. Now I am going to measure AC 220V without trf. I'm going to use a 220V AC to 5V DC transformerless power supply to interface with PIC adc. The same thing I want to do with 440V. So I need a circuit (transformerless) which converts 1000V AC to 5V/12V DC. I will

Dear all, I'm trying to make voltmeter using pikoBlaze, but unfortunately i cant correctively configured adc. Please look at my code and tell my what i have to change. The code was written using PikoBlazeIDE. I hope polish comments aren't make this code unreadable. MEM "out.mem" VHDL "ROM_form.vhd", "init_test.vhd" leds_0

Help me!!I need to do a project for a voltmeter based pic18f4620

You can use thise project and adjust code for your needs just to shows voltage on lcd, and most important you have example of adc conversion: code is writen in MikroC. For higher input vol

Need help in coding for voltmeter using PIC16F877 and LCD

You can write a code that will read voltages through adc pins of the PIC at preset intervals (usually .5secs) and then display it on the LCD. Here is a link to a video :

Voltmeter Code in ASM for PIC18F

Hi I am using 10 bit adc and the coding has been done in Assembly Language. I need to display the input voltage (which is scaled by 2.5 ) on the LCD . Pls suggest me on how to do this in ASM as it involves lot of floating point multiplications and all... Thanksss

Feeding negative volatage to AN1 of PIC micro

if you mean a 5K+1K divider then the ratio is 1K/(1K+5K) =1/6 so with 12v in you'll get 2v output. Have you applied the correct calculation for the current in the input from the OPAMP? (adc*3500)/1023 gives you the input voltage in mV but you need further calculations to get the current, you need to divide this with 5 to get the voltage at the in

[Moved] Problem using ADC 0808

Take a closer look at your incoming signal using an oscilloscope while the adc is sampling the voltage. See if you have some ripple on the line, or see transients. When the adc takes a reading, it does so from a single instance in time... a simple DC voltmeter will take an average over a long period of time, so you may not "see" the ripple (...)

need PIC based AC / DC voltmeter (1 to 440V)

As pic deals with 5v so you need to step down your voltage to 5v by using transformer. Use two analog pins for seperate mode (AC and DC). use a formula in the pic in such a way that if you get 5v input at analog pins it shows you 440v. use the higher resolution of adc for accurate readings. hope this would helps you making the theme Best reg

simple LCD based Voltmeter with PIC16F688

Hallo Viewers, I get a good and simple LCD based voltmeter with PIC16F688 form can measure only 1.5 V to 20 V DC. But i need to change the Voltage range between 1.5 V to 70 V DC. can anyone know how to convert the source code for given purpose? I dont know to change the source code. This this the programme code of the PIC16F688 and t

choosing a sensor for voltmeter..??

hey can anyone suggest me a sensor for my voltmeter project... Its input voltage is 33kv with 100v resolution , I m using the microcontroller with inbuilt adc and this microcontroller does not requires a separate pt, but i want to convert the input voltage i.e. 33 kv to 110 VAC .... can i use a step down transformer or kinda thing....???

Difference between ADC otuput and voltage measured with voltmeter

Hi! I would like to ask a question that troubles me. I am trying to test and calibrate a data acquisition system and I am facing the following problem : I am using an InAmp that amplifies the output voltage of a strain bridge and the output of the InAmp goes to a 12-bit adc integrated in an MSP430 uC. I have several test configurations and th

Problem with reading and processing ADC value for a voltmeter

Hi, ADRES = (Vin/Vref)* So, for 10-bit you have ADRES = (Vin/Vref)*1023 That's a maximum of 1023. That's 10-bit, so obviously an 8-bit register won't hold it. You need a 16-bit register. You should use integer, although in some compilers int is an 8-bit data type. There you must use int16. Float is ov

AC Voltmeter using PIC ADC (0-300V)

Well, if you want to measure using the adc and you have 10 bits, that gives 2Λ10 possible results so the step size is 300/1024 = 0.293 Volts per step. You have to decide if you are measuring AC peak or RMS and convert it to DC before you can measure it with the adc. You might also have to make provision for higher voltages, for example, if