Using an Arduino as a Latching Relay

I wrote this one hot week in July 2010. I've been leaving my front door ajar, to get some air through the house. Probably not a very good idea. So I thought I'd hook up an Arduino to ensure that no one takes advantage of the door being unlocked. This essay isn't meant, primarily, to tell you how to make a "fantastically useful" device. While the device is useful, and could be used for several things, the ma ...

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Arduino-based Graphical Heart Rate Monitor

Introduction: Like many out there, I enjoy a good exercise session, whether it be indoors or outdoors. As part of that I purchased a Polar branded heart rate monitor, which came with a "Wearlink" chest strap and RS300Xsd receiver watch. The watch is able to do quite a bit of analysis on its own, in terms of recording heart rate averages, target zones and the like, but without the additional FlowLink device ...

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High-Power Control: Arduino + TIP120 Transistor

Up until now, we have talked about working with a lot of low-power devices. Sensors, LEDs, ICs, and the like are all capable of being powered directly from your Arduino, but as many awesome 5 and 3.3v components as there are, eventually you will find yourself holding a 12v solenoid, motor, or light and wondering “How the heck am I supposed to control this from my Arduino?” Well today we are going to talk ab ...

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SunAir Solar Power Controller for Raspberry Pi and Arduino

Ever wanted to build your own Solar Powered Raspberry Pi or Arduino system?   SunAir and SunAirPlus are 3rd Generation Solar Charging and Sun Tracking Boards designed by Dr. John C. Shovic at SwitchDoc Labs. You can use this board to power your projects and add a servo or stepper motor to allow it to track the sun using photoresistors to generate even more power! It incorporates a number of outstanding feat ...

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Using Arduino and Pd for musical live performance

Connecting an Arduino microcontroller to Pd is no big problem: You can just put Firmata on your Arduino and use the Pduino library for communication on the Pd side. But sometimes Firmata is not the answer to every problem: You may want to turn on the built-in pull-up resistors for digital input pins, you may want to do some calculation on the Arduino before sending a message, or you may want to send a messa ...

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Lab 8: Shift Register and Binary

Topics: First Build The Circuit The Code Hardware Theory Overview-"Rollover Rollover" What is a Shift Register How the Arduino Controls the Shift Register Software Theory The shiftOut Function Binary Numbers Other Functions in the Code Exercise References 1. First Build It would be a really good idea to build this circuit before going to the lab because it is time consuming to connect all of the wires. 1.1 ...

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Knock Detector

Introduction For the third assignment, we decided to make a 'knock-detector' that is capable of informing the user/owner of specific events. We designed our system such that it can detect both casual knocks and knock patterns. Casual knocks could be used to inform the owner/user that someone is at door, which may be particularly useful for the deaf or in situations where it is difficult to hear the knocking ...

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Tutorial 18: Two Wire Arduino Knight Rider

This tutorial shows how to interface eight LEDs to an Arduino using only two Arduino pins. This is made possible by using a PCF8574 I/O expander IC. A "Knight Rider" display is shown on the LEDs. Prerequisites Complete tutorial 4 – Arduino Knight Rider. Be able to use DIP IC packages, e.g. from tutorial 17. Components In addition to an Arduino Uno board, USB cable, wire links and a breadboard, you will need ...

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Weather Monitor

This Instructable shows you how to build a micro-controller based weather monitoring device. Built on the Arduino Uno board it can easily be extended and modified should you have additional sensors at hand. Main requirements: - Measure temperature (accuracy +/- 0,5 degree Kelvin) - Measure barometric air pressure (+/- 0,1 Pascal) - Display measured values on a LCD on demand by pressing a button Main compone ...

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Tutorial 15: Arduino Serial Thermometer

The Arduino reads temperature from a MCP9700 temperature sensor IC and displays the temperature in the Arduino IDE serial monitor window. Also see the Arduino LCD thermometer tutorial (tutorial 14). Prerequisites Complete Tutorial 9: Using the Arduino Serial Port before attempting this tutorial. Components Besides an Arduino Uno board, USB cable, wire links and a breadboard, you will need: Qty Part Designat ...

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Speech Controlled Quadropod

This is my first post on Instructables and I am super excited to share my knowledge! My original robot post is here: Spryo SpoonTail which is just my robot showing some tricks but with a tethered control. In this Instructable I am going to show you how to make a quadrapod of your own and using speech recognition via bluetooth to control your bot. Gotta thank Oddbot for introducing me to robotics and helping ...

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DIY Low Cost Arduino Mobile Development Platform

I have wanted to build my own robot for awhile now. But after many tried and failed attempts, I was losing hope that may ever happen. I discovered that there wasn't a small, robust, super easy to add-on to, robot that was within my budget to get. After hours of research and many robot kits later, i decided to build one from scratch. This includes building the base and electronics myself. I was always a fan ...

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