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# Voltage N Current Display

84 Threads found on edaboard.com: Voltage N Current Display

## ADE7753 convert register's value into actual value like Voltage, Current, P.F.

Hello I'm usnig ATmega8 with ADE7753, display on 4 digit seven segment. I already read/ write ADE7753 register's bits n display register's default value on 7-segment (e.g. I read MODE (0x09) register's default hex value (0x000C) and displayed on 4-digit 7 segment like 0012 in decimal). Means there is no issue with SPI (...)

## inverter theory - how can I bring the inveter to resonance ?

hello dear forum, this below circuit is the schematic of an ultrasonic inverter 129223 I want bring the circuit to resonance by playing with the value of inductance between output transformer and the piezo element my question is ; if I display the current and voltage at the 220 VAC input with the osciloscope -

## 2 inch display circuit (about efficiency).

I would expect 10 to 20 mA average and 40 to 80 mA peak segment current for a 2" display. It has multiple LED chips (e.g. 2-4) in series connection, in so far a higher supply voltage than 5 V is required. Due to the forward voltage, the segments can be possibly still driven by a 5V open drain circuit. The problem is (...)

## PIC18F + 9V 20 mA 4 in. 7-segment display problem

Your block diagram is insufficient. Each digit needs to drive 4x160mA with constant voltage ( either common Anode or COmmon Cathode) which is multiplexed to give 1/4 of the average max current of 160mA per digit. Then each segment must be current limited by a resistor drop including ESR of driver, Vf of LED @20mA and Vdrop of digit driver ( (...)

## 16X2 LCD contrast voltage(Vo) is not stable

Hi, Usually the contrast voltage must be supplied by the user, not by the display. So if it is not in the expected range you should pull it to the expected level. This may fail if there is a high current in/out of the VC pin. Check datasheet to finde max. current and then check circuit on this. Klaus

## current measuring question

The question you did not answer was; Was the display backlight visibly fully on, when you measured the current? If not, it's the problem Audioguru describe. The current shunt in the meter has a voltage drop. Most backlights I've seen has a Vf between 4 and 5V, normally around 4V5. If you reduce the (...)

## current measurement using CRO

Sounds like you are trying to measure ?C supply current. 1. You'll use a series resistor with suffcient margin to minimal voltage, e.g. 100 or 200 ohm. 2. You can't display ?A to mA current in a linear range. I'm not sure if it makes sense at all to acquire current waveforms in the ?A range. You're (...)

## Help needed in programming pic as pure sine wave inverter with lcd display

Please i need assistance on how to write program in MikroC to a PIC microcontroller to work as an inverter and display some parameters like,battery level,output voltage,output current and power Urgent assistance needed please.

## Using a Micro controller as a pwm regulator in a SMPS

Yes its possible. I have used an MCU as PWM regulator with voltage and current feedback loops and other interface as well. If you do it right you might be able to increase the overall efficiency. ATMEGA is relatively more expensive than other MCUs I used. Microchip's PIC16F18xx series can be considered and if are able you can use NXP's LPC11xx whic

## LCD is not displaying anything

Hi, I am trying to display current and voltage values on LCD but its not working. I could see only "black squares" in first row.But if I remove any of the code part(current_read or voltage read) then LCD works!Here is my code: // LCD module connections sbit LCD_RS at RB7_bit; sbit LCD_EN at RB6_bit; (...)

## Microcontroller Power Supply(5v 3A)

hello, When you power up both PIC and display, is your 5V OK ( voltage value keep normal). If yes, it is not a probleme of max current value possible by the power source (3A instead of 1A capability) but a probleme of timing exposure to light up the led, and also if timing is very short, you must increase the curent value passing trough (...)

## 3 phase digital meter using pic

if you do a web search for pic measure mains voltage and pic measure 3 phase line you will get many links which sholud help

## three phase monitoring using pic mcu

what voltage and current range are you interested in?

## Can someone suggest a 1.5V rechargeable battery tester circuit for me?

Best intelligent charge monitor will pulse battery with light load and heavy load and compute C, capacity based on load voltage and ESR. For example using programmable current source ,pulse 1st 5 mA then 505 mA and use S&H to display ESR or delta V over delta I (0.5A) which is a function of C the Ah capacity of battery. Each battery (...)

## Dual Display Meters used for?

Or if it is simply two digital displays in one package it could for example be measuring voltage and current simultaneously. They are frequently used in the outputs of power supplies but could be employed anywhere where two readings are needed at the same time in a compact space. Brian.

## -20V display Bias voltage

i need more current! You didn't reveal your input voltage nor your output current requirement! You want us to guess? Perhaps this one could do the job. S. fig. 10

## comment lire un courant par un Pic18f452

what is the current range ? the current is not fixed, the idea is to apply a high voltage and later reading the current indicated, this current value must be displayed on lcd

## how to display current waveform on oscilloscope? (Multism)

I don't know multisim, but most simulators allow you to monitor current through a device-the oscilloscope is just a 'virtual' instrument, so there shouldn't be any problem asking it to display current. Worst case, you could put a small resistor in series with the diode and measure the voltage across the resistor.

## Server side programming for Data transfer between GPRS modem and Remote server

I have SIM300 module connected to an electronic hardware. I need to transmit certain information (voltage, current, etc) to a remote server. The purpose of this process is to display the information (voltage, current, etc) finally on a webpage which can be accessed from anywhere. I have come across a (...)

## Another one digital voltmeter on Atmega8

how much voltage can be measured vmin vmax dc or ac?

Hi, Does anyone ever use ADS 2011 version? I am using it to do analog circuit simulations. I would like to calculate an input impedance by running ac simulation. However, after doing this by employing an ac voltage source and current probe, I cannot find the "advanced" button in data display window of this version of ADS. So that I have (...)

## RS232 as power supplyer

I am planning to using a RS232 to supply voltage to my circuit. In this circuit the LCD will read out the temperature sense by LM35 and display it. The pic also will send the temperature to pc and store it. My problem is, initially my LCD give out some reading then after a few second it then give out zero only. Is it not enough current (...)

## power supply problem for controller

hello all, i had designed simple dc voltage measurement and display(LCD) with 8051 mc for a solar inverter. the problem is when the load is connected to the inverter the lcd brightness becomes dim. i think the load is getting maximm current. how to solve this problem should i need to have any special filter to prevent the lcd dimmness? (...)

## PS1503SBU - is it normal ?

Is it normal with power supplies that it doesn't turn the `current' LCD on when you power up the unit ? I got the ps1503sbu but I don't have anything to connect to it with me, and when I turn it on it only shows the voltage, the `current' lcd display is dead. It may be because there is no current flowing (...)

## I need assistance on what items to purchase to make a custom LED lighted display base

The first parameter is the DC voltage you have available from battery , power supply or anything else. Second question is simple. You use the typically values. Only if the value of the resistor or number of led you like to use does not exist you put the maximum just to know if your led will be damaged. Example. 12volt power supply and 3 led of 3.3

## How to create flowchart or algorithm for energy measurement using microcontroller?

i want the internal happening in the PIC. input the voltage & current to PIC. then analog to digital cnversn energy calculation takes place. then what?? for lcd display ASCII value is passed.. in flow chart/algo what to mention after calculation that digital value converted to ASCII?? Can explain in detail the algorithm ?

## How to create flowchart or algorithm for energy measurement using microcontroller?

i want the internal happening in the PIC. input the voltage & current to PIC. then analog to digital cnversn energy calculation takes place. then what?? for lcd display ASCII value is passed.. in flow chart/algo what to mention after calculation that digital value converted to ASCII??

## 24 bit ADC not working with P89V51RD2

Hi, All. Am trying to interface CS5460 and P89V51rd2. The Set up is not working please suggest me wher i gone wrong. Am using 4 seven segment display, am getting some garbage values in the display I wanted to display consumed power/energy, even i have tried voltage and current. Please guide me (...)

## A Digital DC Power Supply (programmable bench power supply unit)

This bench power supply unit is less comlex than most other circuits but has a lot more features: The display shows the actual measured values for voltage and current. The display shows the pre-set limites for voltage and current. Only standard components are used (no special (...)

## is it varying Emitter - collector resistance according with base volt ?

YES, you can use a scope as a curve tracer to measure the current gain in a transistor or the voltage gain in a FET or the transconductance of a MOSFET. Simply use series resistor on emitter to monitor current and display as Channel 1 and voltage as Channel 2 and use scope in XY mode to see the input versus (...)

## Measuring current (via sense resistor) with a coaxial cable assembly is unecessary?

Hello, Please could you tell me if the following current sense resistor voltage measurement technique, which is the standard procedure at a HUGE international telecoms company, is correct? It concerns the measurment of current (~16A) consumed by the FPGA at the output of a 500KHz, 0.9V buck converter. The current (...)

## LED bar display for 100v a/c signal (intensity monitoring)

but LM3914 is for DC voltage. will it work for a/c also.

## Need help in the coding

hi i m trying to display the voltage as well as the power from a solar panel on a LCD using microconroller, but i m not getting any idea of writing the code (in C) because the voltage level will change with the variation of light falling on the panel. so guyz can anybody help me regarding this problem... plz do help me... thanks in advance...

## slowing down current?

Hi All I picked up a digital voltage gauge for my families Polaris Ranger. it on a battery first, fine, drilled a big hole in the dash, installed, started up the ranger, and the gauge goes NUTS. It's very

## Detecting Negative Voltage?

I was thinking of making my own lab power supply so thought to add negative supply also. Obviously i have to display both voltage and current. In pici can only feed positive voltages on ADC. How do i feed negative voltages? One idea is to invert that negative voltage using an inverting (...)

## Watt meter using 16F877a

Sample voltage and current separately through adc, then do the math in pic. current value is sampled voltage value on pass resistor. Sample at regular intervals. voltage developerd due to passing current indicate resistance, you dont have to disconnect it from the circuit.

## Displaying Current in 2 digit

Hi, I want to display current measured in 2 digit. Please suggest me how to do it. nominal current sensor voltage is 2.5V. and from thr 25mv per Amps. I want to display this in two digit from 1 to 20amps.I need help only in convertion to digit. I have program to display the digits. I am (...)

## calculating complex impedance in LTSpice

The most logical way is to inject a current into the device and to simulate the voltage across it (ac simulation). If you choose 1 Ampere then the complex voltage is identical to the complex impedance (X=V/I). Now you have the choice to display magnitude and/or phase as function of the frequency or the locus curve in the (...)

## Symmetric two-channel power supply 2x30V 5A Lm317 lm337

Assumptions of the project were: the power supply should be small and have big current efficiency, display the voltage, current, power and temperature, have voltage adjustable by a switch. Transformers used have 24V and about 5A.

## displaying Car betty information on LCD screen using microcontroller 8051

Hi, I wanna make a project to display my car bettry information on LCD Screen. this battry is actually connected to a UPS and i wanna make a monitoring instrument for it that will continuously monitor the current, voltage of the bettry and also the ampere hour rating of the bettry and the time left in which it can deliver power to the (...)

## PIC 16F877A based Current Source for Reverse Iontophoresis applications

I need to make a current Source controlled by a PIC 16F877A which should be able to 1. Set the current Range - 0 to 500uA 2. Give up to 2 different Square Waveforms of frequency 10 mHz to 10 Hz with adjustable duty cycle with resolution 0.1% 3. Shut off when current/voltage exceeds a limit. 4. display (...)

## 16x2 lcd display problem

my 16x2 lcd is working in a PIC development board with sample program of MikroC. but same connection, doesnt work in my circuit. i dont kno whats wrong. normally if power is supplied to LCD, dark square boxes will appear on screen. but in my case, i cant get that from my circuit. so, i took it as some kind of power problem. i get the power from

## Testing an Industrial AC and DC Variable Speed Drives

Hi all, i did this test in the lab. can anyone help me with some doubts that i have? below is how the system was setup. Power circuit of lab drive shafts of motors M1 and M2 are coupled directly. The AC VSD (A1) is a two-quadrant drive, and hence cannot provide braking. Motor M1,

Hello everyone I have established connection b/w ADE7753 and ATmega32. Problem still facing is the incorrect reading of Load power and current. e.g. LCD display 74W when 60W load is connected to it!! Also, displays 9W-1W when no load is connected!! :idea: Any one has idea how to read ADE7753 read register correctly? :???: Thanks (...)

## 50hz switching transistor

Frequency is not a problem but what are your going to switch, if it is a led or lcd display (15-100mA) in a low voltage circuit then you can use it. Alex

## How to display voltage and current readings with spice?

How do you display voltages and currents readings on the schematic with SPICE?

## How do I identify Live, Neutral and Earth?

The ground wire and the neutral wire will both display extremely low resistance to an earth ground as they are bonded together at some point (if the installation is properly done, subject to the local regulations) .. As the earth wire is not used to conduct current it should not display any voltage drop if a load is (...)

## Measuring current on negative rail.

Hi All, I thought this was going to be easy, but I was wrong. I have a dual rail power supply that I would like to add some voltage and amp display to. As I would also like to do some logging, I thought doing both with a PIC is the way to go. The voltage part is fine, it is the current path that is getting me. As the (...)

## How to use DC meter with 3 digit 7 seg. based on PIC 16F676?

Hi, Use a "shunt resistor" in the current path. Measure the voltage drop across the resistor using ADC and then use the PIC to calculate I = V/R and then display required voltage on 7 segment. E.g. If you have a 0.1R resistor and 3A flows through, V = IR = 0.1 * 3 = 0.3V, interpreted by ADC as (0.3/5)*1023 = 61 . T

## Digital Potentiometer controlled by atm128

hi, i want to make controlled current source which use max5400 digpot as voltage controller, atm128 used 2 control it by 3-wire, keypad as inputs 2 determined wiper position and lcd 16*2 as display,, the problem is,i lack of any language programming,i used 2 try some of it like asm and C,could u provide me any source code or any link or any (...)