Analogue Sensors – Calculate the Nonlinearity Introduced by a Load or Pull Down Resistor

Have you ever had that terrible feeling that adding a load resistor or 'pull down' to your sensor is messing up all your analogue readings? Maybe you're wondering why we'd want to spoil a perfectly good circuit by putting in a load resistor at all? For many years I found that I would get strange, unpredictable, readings from my sensor related projects at the maximum and minimum locations when using analogue ...

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DIY Time Control Machine

This project is about how to make a time machine! This machine looks like a glove, and can "stop" any moving subject. At first, watch a video with some demonstration and experiments, guess how it works, and then read about how to make it =) This effect looks like better in real life (by naked eye, not through a camera), without black lines. Smooth perfect time stop effectc!! IT IS REAL "OH MY GOD" REACTION! ...

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0-24v 3A Variable Power Supply using LM338

Batteries are generally used to power up the Electronic Circuit and Projects, as they are easily available and can be connected easily. But they drained off quickly and then we need new batteries, also these batteries cannot provide high current to drive a powerful motor. So to solve these problems, today we are designing our own Variable Power Supply which will provide Regulated DC voltage ranging from 0 t ...

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1.3V – 15.5V @ 2 Amps Power Supply

If you find my design interesting, you could make a small donation: http://paypal.me/RegisHsu This is a small size power supply with low cost and easy to make that only taking about 5 more hours. I was very happy with it and would share with you. Power Supply Specifications Input: 5v-16v/3A DC Output: 1.3V - 15.5V/2 Amps Step 1: Materials and Tools Here is a list of materials and tools I used for this proje ...

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Improved Arduino Rotary Encoder Reading

Rotary encoders are great input devices for electronics projects - hopefully this Instructable will inspire and help you use one in your next project. Why write rotary encoder code? I wanted to use a low cost rotary encoder as an input mechanism for one of my upcoming projects and was initially bewildered by the code options available to take readings from the rotary encoder and determine how many "detents" ...

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How to measure mass of the Earth using Arduino

One fine day, I was weighing my self on a weighing scale. Suddenly a thought came to my mind, 'How much would be the mass of Earth?'. Leave that apart 'How can we even measure it?'. There is no such weighing scale on which, Earth can be placed. There has to be some indirect way to measure mass of the Earth. Here I present implementation of one such indirect method to measure mass of the Earth. Step 1: The I ...

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Arduino based Angry Bird Game Controller using Flex Sensor and Potentiometer

It’s all started with a small game from the dark ages called “Mario”, right from the time of being a tiny little guy jumping on ducks to save my princess till being a masculine handsome Prince roaming in Persia (Prince of Persia) fighting against darkness to save my world behind I have been a great fan of playing video games and I grew up playing them. But they do get bored up sometimes and I feel less invo ...

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DC-DC Buck Converter Circuit – How to Step Down DC Voltage

In this project we are going to make a Buck Converter Circuit using Arduino and N-Channel MOSFET with a maximum current capacity of 6 amps. We are going to step down 12v DC to any value between 0 and 10v DC. We can control the output voltage value by rotating the potentiometer. A buck converter is a DC to DC converter, which steps down DC voltage. It is just like a transformer with one difference; whereas t ...

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Portable Adjustable Mini Power supply

A BIG HELLO! and welcome to Mixed Outputs first instructable. As most of my project involve electronics of some sort, having a good power supply is essential to be able to meet the demand of different power requirements. So I built me a bench-top power supply from an old ATX power supply Unit (PSU) that worked (and still works) great. However I've recently noticed some limitations with having a full fledged ...

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Arduino DC Motor Speed and Direction Control using Relays and MOSFET

In this project we control direction and speed of a 24v high current motor using Arduino and two relays. No power switches are needed for this circuit, just two push buttons and in Potentiometer to control the direction and speed of DC Motor. One push button will rotate motor clockwise and other will rotate it counter clockwise. One n-channel MOSFET is required to control speed of motor. Relays are used to ...

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DCC mini central with IR remote control for testing locomotive decoders

I just wanted a simle DCC central wich I can use to test new DCC locomotives n ad potentially with a "program" mode so it can "break in" new locomotives for me by running them for specific periods of time in both directions.   The result is an Arduino  based DCC central.    It is based on some stuff I picked up from the  "interweb" and either slimmed it down or added new features.   It uses an ATMel 328  mi ...

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The DJ Switcher.

This is an electronic input switcher for amateur DJ's who are running short on inputs on the audio mixer. It allows you to connect 2 inputs to channel 1 and 2 each, and 3 inputs to channel 3. Each input channel has a toggle switch and 2 or 3 LEDs indicating the active input.  The actual switching is done using DPDT relays driven by Arduino (AT328p)  via a simple 2N222A or even BD547 NPN transistor.   It als ...

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