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Ultrasonic range-finder with haptic feedback

Introduction "An ultrasonic range-finding hat with variable haptic feedback for obstacle detection." -Project Sound Bite For our ECE 4760 final project, we designed and implemented an ultrasonic range-finding hat that uses haptic feedback to alert its wearer about obstacles in his or her path. The hat is equipped with an ultrasonic transmitter/receiver circuit, which is capable of emitting short pulses of u ...

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Capacitive Touch with Atmel’s AT42QT1070 Touch Sensor IC

Rather than using an out-of-the-box capacitive touch solution for my projects, I thought I’d attempt making my own little breakout board. The idea is to use a sensor capable of triggering normal digital input pins using touch. This post covers the selected touch sensor IC, the circuit used, getting a custom PCB made and how to use it in a project. At the end of this post, you’ll find a video covering the so ...

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An optical dust meter that uses the GP2Y1010AU0F sensor library made with AVR Atmega

This project is a dust detector that use the GP2Y1010AU0F sensor. Attached you can also find the GP2Y1010AU0F sensor library for AVR Atmega.GP2Y1010AU0F is a dust sensor by optical sensing system. An infrared emitting diode (IRED) and an phototransistor are diagonally arranged into this device. It detects the reflected light of dust in air. Especially, it is effective to detect very fine particle like the c ...

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AVR Atmega dehumidifier controller board, update

This project is an update to the previous dehumidifier based you can here: http://davidegironi.blogspot.it/2013/04/avr-atmega-dehumidifier-controller.html This update adds some usefull functions. The main issue that i've fixed is the microcontroller crash, that happens sometimes. I've noticed that sometimes the controller stop running, crash or doesn't works as expected. After some experimets, i've noticed ...

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An AVR Atmega based PID magnetic levitator

This is a magnetic levitator implemented using Atmega8 microcontroller. Magnetic levitation is a method by which an object is suspended with no support other than magnetic fields. To make a magnet levitate, an hall sensor is attached to a coil. The coil acts as an electromagnet, and the hall sensor measure the distance of the magnet from the coil. The coil it is driven by PWM impulses, the closer the magnet ...

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CT Sensor on AVR ATmega

A CT (Current Transformers) sensor is a device used to measure alternating current. A CT sensor, like other current transformers is made by a primary winding, a magnetic core and a secondary winding. The primary winding is often a single wire passing through the main core of the transformer. The seconday winding is used to sense the AC current passing through the primary winding wire. They are usually build ...

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CT Sensor on AVR ATmega

A CT (Current Transformers) sensor is a device used to measure alternating current. A CT sensor, like other current transformers is made by a primary winding, a magnetic core and a secondary winding. The primary winding is often a single wire passing through the main core of the transformer. The seconday winding is used to sense the AC current passing through the primary winding wire. They are usually build ...

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