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0
votes
1answer
50 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
votes
0answers
60 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
1answer
67 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
110 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 ...
0
votes
0answers
438 views

dB Meter with Arduino and AD8307

I am attempting to construct a decibel meter using an electret mic breakout board (shown below) and an AD8307. If necessary I can use just an electret mic, and not the breakout board. I was ...
2
votes
2answers
180 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
62 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 ...
1
vote
1answer
119 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 ...
1
vote
2answers
191 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 ...
-4
votes
1answer
128 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 ...
1
vote
2answers
192 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
220 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 ...
0
votes
1answer
261 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
108 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 ...
-8
votes
1answer
131 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
vote
3answers
461 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 ...
2
votes
3answers
938 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 ...