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1answer
65 views

arduino current

I want to start learning EE with Arduino so as a project I decided to build an Ohmmeter and measure a (specific) resistance that should be about 100 KΩ ±50KΩ. In order to probe for that resistance I ...
0
votes
1answer
63 views

CS5453 Energy Meter IC

Recently I have come across Energy Meter IC "CS5463". I read the datasheet and it says that the internal registers of the IC stores the Power information as a percentage. My understanding is that I ...
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2answers
187 views

Trying to read serial communication from smart meter with Arduino

First my compliments for this wonderful site. I'm hoping to find an answer to my problem. I've checked to find answers, however was not able to find it. My background is somewhat technical, only with ...
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2answers
137 views

Facing some questions regarding my energy meter project

I am working on my minor project in college and am facing a dilemma/problem with it. Project Description: I am working with an energy meter and am trying to make it smart (in the same way as many ...
0
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2answers
63 views

Connecting AC analog amps meter

I'm a hobbyist/newby and I buy some items to build a cheap nichrome wire heater.First I buy a 50feet of 22gauges nichrome wire. For 120V AC source , I need 8feet of this nichrome wire to get desired ...
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0answers
52 views

Capacitor ESR meter IC

G'day All I am working on building an ESR meter for testing capacitors in circuit. I figure I need a circuit capable of generating at least 200kHz. Looking around I found the Exar XR2206 which ...
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2answers
598 views

Can I use 2n2222 transistor instead of c9013 transistor in a vu meter?

I am building a science project for my friend. We chose to make a VU Meter. I am planning to make the Vu Meter as the schematic in the image: The audio source will be 3.5mm jack output of a ...
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2answers
526 views

How to measure current with an analog multimeter? [closed]

I need measuring the current through a dc motor with an analog multimeter, but I don't know how to select the correct function to that. The meter is a FT-360TR. I know it can measure currents of ...
1
vote
1answer
494 views

Water conductivity measurement AC, interfacing with arduino

I want to implementate this device, mentioned in the title. The problem is how to correctly build the " read out device" that is clearly a wheatsone bridge? But in AC, the problem is the signal ...
0
votes
1answer
66 views

LM3914 4S lithium polymer meter

I need help creating an LM3914 voltage meter (in bar mode). I looked at the datasheet and understand how to create a standard voltmeter (0-5V for example). However, what I need is an expanded range ...
1
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0answers
73 views

How do you measure an output designed for a moving coil meter, using an Arduino?

I have a Yaesu FT-857 Amateur Radio transceiver which has an output for an Analogue Moving Coil meter. The radio will output a current varying between zero and 1 milliamp (0–1mA), depending on the ...
1
vote
1answer
208 views

Tactics for stable unity-gain op-amp

The circuit given below is typical pH meter op-amp circuit. But here LMC6001 is not configured as unity gain. My question is this, I want to make this circuit with unity-gain buffer op-amp. What ...
0
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1answer
109 views

OSI Model for Smart Meters

Seeing as smart meters are becoming more and more popular (in particular countries), I would like to understand smart meters and thought knowing the OSI Model would be a good place to start. I already ...
0
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1answer
894 views

LM3915 VU Meter Not working properly

I built a LM3915 (Waiting for LM3916 to arrive) VU Meter based on Sparkfun's tutorial https://learn.sparkfun.com/tutorials/dotbar-display-driver-hookup-guide Problem is, when I plug the power, only ...
0
votes
2answers
121 views

Why monitoring power and energy in energy usage meters?

This time my question about the how power companies monitor usage. We get electric usage bill in [Kilo watt hour]/Energy. What should be looked up on for monitoring the usage the instantaneous energy ...
3
votes
3answers
260 views

Using step-up converter in metering instrument?

I am designing a pressure calibrator (my first Real project), which is supposed to measure from 0-200.00 mmWC (20000 counts) using Silabs C8051F350 (inbuilt 24-bit Sigma delta ADC). Sensor used is a ...
3
votes
2answers
531 views

How can I extend the ammeter wires to my shunt?

Is it possible for me to locate my ammeter and shunt a few meters away from each other (more than intended by original wiring)? The extra wiring obviously has a resistance and provokes a false ...
0
votes
1answer
98 views

What is the wavelength of an Itron C1S IR LED?

I'm trying to find an appropriate IR Phototransistor for an Itron Centron C1S Meter. But I can't figure out exactly what is the wavelength of the IR transistor used by Itron. Do meters have standard ...
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vote
1answer
291 views

How would you go about creating a lux meter for very low light (0.0001 to 1 lux)?

I like to take pictures of the the sky in really dark places like Death Valley. To get an estimate of exposure times for the foreground I would like to measure the light intensity. According to ...
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2answers
385 views

Serial Data Input through Microcontroller to Output Voltage

I am new here and new to programming, so I thought maybe some of you might be able to help me in the right direction. I am looking to design a circuit that receives serial data from an RS232 port on ...
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votes
1answer
243 views

Smart meters and filtering [closed]

My mother suffers from Electromagnetic hypersensitivity and her electricity provider recently installed her a HF Smart Meter (CERM 1). I've been researching about ways of filtering the dirty power ...
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2answers
434 views

Can I use Mic to input Frequency Meter circuit?

Í'm new to application level of electronics that I'm studying.I have a project to do in college and I was thinking to do a Frequency Meter circuit that can measure the frequency of given input signal ...
1
vote
1answer
314 views

How can I detect brain waves

I want to build some type of electrical circuit to detect alpha, beta , theta etc. waves from the brain and maybe even show the frequency in hertz . Or at first, generate a higher power wave for my ...
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2answers
462 views

Frequency Selective Voltmeters

Does anyone here know of any cheap-ish handheld meters that are capable of measuring the voltage at specific audio frequencies? I'm dealing with a few constant frequency signals on the same wire - ...
2
votes
2answers
122 views

Is there any such thing as a linear panel meter?

I like to use regular panel meters for showing data. I would like to know if there's such a thing as a linear meter, say 10 cm long or so. By linear I mean that the indicator moves up some scale in a ...
-7
votes
1answer
211 views

Voltage/resistors/series/impedance/meter

Assume you measure a power supply voltage through a series 1M OHM resistor and observe that is drops by 1/2 its former value when no resistor is in series. What is the input impedance of the meter? ...
1
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3answers
824 views

How do I hijack a reading from the circuit of my digital meter

I have a tri - meter (ph, ppm, temp) that reads and displays readings on three LCD screens. I'm trying to hijack the measurement at some point in the circuit and read it in through on of the inputs on ...
3
votes
3answers
2k views

How to light an LED when a voltage hits a certain point

Lets say I need an LED to indicate when a DC voltage reaches 5 volts or more. I don't want the LED to be dim when it is at 4.5 or anything. I just want it to be full bright at 5, 0 bright at anything ...