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A little known feature of Arduinos and many other AVR chips is the ability to measure the internal 1.1 volt reference. This feature can be exploited to improve the accuracy of the Arduino function – analogRead() when using the default analog reference. It can also be used to measure the Vcc supplied to the AVR chip, which provides a means of monitoring battery voltage without using a precious analog pin to do so.
Secret Arduino Voltmeter – Measure Battery Voltage - [Link]
The i-voltmeter is an electronic testing tool that can:
- Diagnose electronic functions of anything you need to test
- Data log electronic events over time
- Remote view events with your smart phone
- Create Remote Triggers
- Set Alarms
- Use as an anti-theft device
- Measure electrical voltage, current & resistance
Now you can test a full spectrum of electronics with the diagnosis and data logging features of the iV. Other units cost upwards to $1000. Because it is Bluetooth enabled, you can unleash yourself from the testing device with the iV.
i-voltmeter – Voltmeter with Bluetooth Technology - [Link]
electronicsblog.net writes:
Today I will show how to make digital bridge between Arduino and PC: control analog – digital converter and send measured data to PC. Windows application will be created using Visual C++ 2008 Express.
Voltmeter demo software is very simple, and here is a lot room for improvement, but I just wanted to show basics how to control com port and execute data exchange between PC and Arduino.
Digital voltmeter – Arduino and PC (Visual C++) – [Link]
Sergei Bezrukov writes:
This is a shortened translation from Russian of my article published in Радио (Radio) magazine, no. 8 (2010) pp. 21-23. The voltmeter is designed for controlling DC voltages at the output of a dual bipolar power supply. It not a universal instrument, since its input resistance does not exceed 40K, which might be too low for some measurements. However, it is perfectly fine for power supplies and does not noticeably load their output. The range of input voltages is 0 to 24V for positive supply and -24V to 0 for negative one.
The voltages are sampled every 300 msec and displayed on a 9-digit LED display. Only 8 digits are used, the middle digit slot is always off and serves a a separator between negative (on the left part of display) and positive (on the right one) readings. The unit provides a 0.01V resolution. For small negative voltages (not exceeding 10V in absolute value) a leading minus sign is displayed. For positive voltages a leading zero is suppressed.
Voltmeter for bipolar power supplies - [Link]
circuitvalley.com writes:
This is a simple application of internal 10-bit ADC (analog to digital converter) of PIC16F676 microcontroller.you can use this circuit to measure up to 30 v dc. the possible applications are on bench top power supply or as a panel meter in various system.
MICROCHIP’S PIC16F676 is the heart and brain of this circuit .the internal adc of the mcu with a resistor network voltage divider is used to measure the input voltage . then 3 digest of comm anode 7 segment display is used to display final converted voltage. as you can see in the schematic the displays are multiplexed with each other . means we switch on one display and put the corresponding digit on this while other two displays are off this cycle go for each of the display.
Panel Voltmeter Using PIC16F676 - [Link]
circuitvalley.com writes:
This is a simple application of internal 10-bit ADC (analog to digital converter) of MSP430G2231 microcontroller.you can use this circuit to measure up to 30 Vdc. the possible applications are on bench top power supply or as a panel meter in various system.
TEXAS INSTRUMENTS MSP430G2231 is the heart and brain of this circuit .the internal adc of the mcu with a resistor network voltage divider is used to measure the input voltage . then 3 digest of comm anode 7 segment display is used to display final converted voltage. as you can see in the schematic the displays are multiplexed with each other . means we switch on one display and put the corresponding digit on this while other two displays are off this cycle go for each of the display.
MSP430 based 30V voltmeter - [Link]
grieg.gotdns.com writes:
A couple of weeks ago I spent some time examining a fairly complex circuit board from my old, but still functional, clock radio/CD player. I was using the probe of my handheld multimeter to measure voltages at various IC pins and circuit traces. At one point during the process I thought, “Gee, wouldn’t it be nice if I had someone here to read the voltmeter to me as I test various points? That way I could focus on my probe and not accidentally short neighboring pins.” But then I realized that I did have someone to do just that: Microsoft Sam. I present to you the NI LabVIEW talking voltmeter:
LabVIEW: The Simple Talking Voltmeter - [Link]
How-To: Variable DC Power Supply @ MAKE – [via]
Hobbyist electronics projects need robust, reliable power supplies for prototyping and testing. I learned how to build this circuit from the Basic Analog Circuits class at ITP taught by Eric Rosenthal, but took it several steps further in building a solid enclosure and integrating a voltage meter. Now it lives on my desk, ready to power most small projects I’m working on, ranging from 0 – 24 volts and up to two amps. You can learn all about how to make one yourself using this Make: Projects tutorial.
The mini volt meter from Adafruit is what brought this project to the next level. All of the components on this three-digit, seven-segment display are packaged into a small size. All you need to do to integrate it into any project is attach a positive and negative lead to whatever you wish to measure.
Make a variable DC power supply - [Link]
Put a voltage meter anywhere with this very handy display. These are often used by RC hobbyists for keeping track of batteries but we thought it would be great on a breadboard or enclosure.
Simply connect the red wire to the positive supply, and black to negative ground. The display has a microcontroller that will read the voltage, compare it to a stable reference and display the voltage with 0.1V precision on a 3-digit 7-segment display. It works from 3.2V up to 30V so it will be good for nearly any electronic project! The meter draws 3-4mA to power the microcontroller and display. This particular LED display is a nice vivid green, which we found very readable. Mounting tabs make this module easy to attach to any box or plate. [via]
Mini Volt Meter - [Link]
