Simple, Cheap Motor Controller

I've used this simple circuit several times to drive motors (like in my Stair Climbing robot) as well as solenoids. I originally picked it up from this instructable which is focused on controlling a solenoid. I wanted to isolate this circuit in its own Instructable as a motor driver so I could easily reference it from other future instructables and also provide example code to show how to use it in this man ...

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Simple Infrared Barrier

Although infrared communication might look like the technology of the 1990s, it is still present in a multitude of applications around us. Every time you press the button of a remote control, it is most likely it is using the IR (infrared) technology for transmitting data. The TV remote is the most common example. Air conditioning remote controls are another good one. 1. Introduction Although a remote contr ...

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Simple Infrared PWM on Arduino, Part 3 – Hex IR Signals

In Part 1 of this series, we demonstrated how to send signals using soft or Simple Infrared PWM on Arduino. In our Part 2 post we looked at sending RAW IR signals – specifically a RAW NEC signal and a longer RAW Mitsubishi Air Conditioner signal using soft PWM. We have since improved the PWM method shown in Part 1 Part 2 to provide better performance and improve portability. In this Part 3, we will take the ...

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The Simple Scalar Network Analyzer

After playing around with the SynthNV signal generator/power detector discussed in the previous post I realized what a useful a tool it is for RF testing. While its a terrific tool for VHF/UHF/Microwave testing, the SynthNV has a couple of serious limitations for amateur use in the HF region - the signal generator has a minimum frequency of 35 MHz, the generated signal has a lot of harmonics and its a fairl ...

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Simple and small temperature fan controll

I published this schematic long ago in this article: Adjustable power supply and since then I made some improvements in PCB to make the board as small as possible. The idea is to be easy to attach the whole board to the heat sink which we want to monitor. The board is only 27mm x 27mm. 1. The C3 can be omitted, its purpose was to filter noises picked up by connecting cable between board and sensing transist ...

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Simple circuit lets you characterize JFETs

When working with discrete JFETs, designers may need to accommodate a large variation in device parameters for a given transistor type. A square-law equation is usually used as an approximate model for the drain-current characteristic of the JFET: ID=β(VGS−VP)2, where ID is the drain current, VGS is the gate-to-source voltage, β is the transconductance parameter, and VP is the gate pinch-off voltage. With t ...

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Simplify DC-DC Converter Characterization

DC-DC converters are widely used components that convert DC power from one voltage to another, producing a regulated output voltage. These devices are used in many electronic products, including laptops, mobile phones, and instrumentation. Like any device, DC-DC converters need to be characterized by manufacturers and by engineers evaluating them for a design. Given the increased pressure to develop product ...

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SIMPL Revisited – Again, but this time it’s personal

In May 2013, I learned about Ward Cunningham's Txtzyme language - a very simple serial command interpreter which allowed basic control of microcontroller function using a serial interface. I wrote about it here: Txtzyme - A minimal interpretive language and thoughts on simple extensions Tytzyme was about as easy as a "language" could get, it offered digital input and output, analogue input, rudimentary timi ...

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Simple Infrared PWM on Arduino

We are often asked on discussion boards, about conflicts between IRremote or IRLib and other Arduino Libraries. In this post, we present a sketch for ‘Simple Infrared PWM on Arduino’. This is the first part in a 3 part series of posts. Part 1 shows how to generate the Simple Infrared PWM on Arduino (AKA carrier frequency), using any available IO pin and without conflicting with other libraries. Part 2 will ...

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How To Make a Simple Variable Frequency Generator Using Arduino

A frequency generator is a very handy device in electronic design, development, testing and trouble shooting. It is such a kind of device which can generate the required frequencies which can be then applied directly to the target device for testing it. There are frequency generators which can generate the required waveform like sine wave, saw tooth wave etc. but for normal applications the square wave gene ...

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A Simple Bat Detector based shield for the Arduino Uno

I've built a number of projects that have interfaced the output of the Simple Bat Detector with a microprocessor. The most recent was the BatLogger II. But I hadn't come up with an easy way for others to experiment with this idea ... until now. My friend, Frank, in Germany, had wanted to make a relatively inexpensive bat activity logger ... and he had come on the idea to do it using a Simple Bat Detector co ...

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ArduDroid: A Simple 2-Way Bluetooth-based Android Controller for Arduino

UPDATES  October 30, 2013 - 7PM (GMT+2) The new official name for this app is ArduDroid and it can be installed from Google Play. I changed the name to avoid a naming conflict with another app.   September 15, 2013: I Have won a Nexus 7 tablet for this project part of a competition held by Instructables.com Thanks to everyone who voted. August 18, 2013: I have uploaded the Anrduino 0.11 alpha version with f ...

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