Visual Computer Stress Meter using an Arduino

Have you ever wanted to, without going out of your way to clock your processor, see how much stress your computer is under? With this project you will have a simple bar graph that constantly shows how much stress your computer is under. If the graph reads 0, your computer isn't working too much. If it reads 8, the highest, your computer is working very hard, and you probably should give it any more of a loa ...

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Quality of Life Meter

Harsh new rules at work getting you down? Overtime sucking the life out of you? Or maybe things are great, either way now you can show your co-workers and management exactly how you feel about your job without a single meeting, memo, or team bonding exercise. This is the Quality of Life Meter. Boss take credit for your hard work? Turn it down. Get a bigger bonus than expected? Turn it up. There is no exact ...

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How to use a while loop to calibrate the value of an analog sensor using Arduino

Sometimes you want everything in the program to stop while a given condition is true. You can do this using a while loop. This example shows how to use a while loop to calibrate the value of an analog sensor. In the main loop, the sketch below reads the value of a photoresistor on analog pin 0 and uses it to fade an LED on pin 9. But while a button attached to digital pin 2 is pressed, the program runs a me ...

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Homemade Infrared Rangefinder (Similar to Sharp GP2D120) using Arduino

Here is my instructable on how to construct a pretty simple (for some!) short range infrared rangefinder/range sensor. Infrared rangefinders are very useful in a number of projects. The majority of these come from obstacle detection (in robots) or generally detecting distances! The one shown here is only a simple rangefinder and will only really be able to measure about 6 or 7cm infront of the range finder. ...

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A Self-Contained Data Logging Anemometer

I love collecting and analyzing data.  I also love building electronic gadgets.  A year ago when I discovered the Arduino products, I immediately thought, "I'd like to collect environmental data."  It was a windy day in Portland, OR, so I decided to capture wind data.  I looked at some of the instructables for anemometers and found them quite useful, but needed to make some engineering changes. First, I wan ...

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Accelerometer Dice with 123D Circuits

This is the project that got Autodesk's CEO Carl Bass a little extra attention from the TSA on his way to MakerFaire Tokyo.  Here's an article about that... We made this as way to demo a few things you can do with our apps, 123D Circuits and 123D Design :  Design circuits.  Simulate the circuits online.  3D Model online and prepare for 3D Printing. Here's how it works - pick up the die, shake it, watch whil ...

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Potentiometer or variable resistor control LED Code

The if() statement is the most basic of all programming control structures. It allows you to make something happen or not depending on whether a given condition is true or not. It looks like this: if (someCondition) { // do stuff if the condition is true } [Get Code] There is a common variation called if-else that looks like this: if (someCondition) { // do stuff if the condition is true } else { // do stuf ...

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Analog VU meter and Clock using Arduino

This project brings back the old time Analog VU Meter, with the added functionality of a neat looking clock! When you turn off your music the meters automatically swing into to clock mode. Behind it all is the popular and easy to use Arduino. This is my submission for the Make-to-Learn Youth Contest: What did you make? I made an old style analog VU meter and Clock using 2 analog panel meters, an Arduino, a ...

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Arduino Voltmeter Code

This arduino projects show how to make voltmeter with your arduino. It use voltage divider concept to estimate the voltage input. Instruction; 1) Connect all jumper wire as shown in diagram. Upload this code to your arduino /*   Voltmeter   Voltmeter base on voltage divider concept.   Code based on: http://www.clarenceho.net:8123/blog/articles/2009/05/17/arduino-test-voltmeter   Coded by: arduinoprojects101 ...

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Arduino RPM Counter / Tachometer Code

Arduino projects, make arduino rpm counter with arduino.   Instruction; 1) Connect all jumper wire as shown in diagram. 2) Connect IR LED to digital pin 13. 3) Connect IR Phototransistor (dark) to digital pin 2. Make sure shorter lead connected to digital pin 2 and longer lead to Ground. Upload this code to your arduino /*  * Optical Tachometer  *  * Uses an IR LED and IR phototransistor to implement a ...

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Power (Energy) Meter using Arduino

Part 1.  Analog Front-End. Opto-Isolator. Looking at the Power Quality Analyzer display, I was wandering, if there is any error in the measurement results, introduced by transformer. Overall THD picture doesn’t change much, suspiciously drawing same chart in the morning and in the evening, when electrical grid load significantly differs. Obviously, to estimate effect of the transformer, I have to repeat mea ...

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Audio VU Meter using Arduino

Biasing AC input using resistor divider and scaling up / down if necessary; Sampling fast and accurately using direct access to Control Registers of ADC and Timer1; Subtract whatever was added at step #1 from result of Analog / Digital conversion and Square; Average / accumulate, filtering following VU specification; Sqrt – take square root, Log10 – transform to dB scale; Display. 1.   Hope, you follow my a ...

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