Mizchief100 @ instructables.com wanted a way to control with dorm air conditioner so he build an Arduino thermostat that controls the control knob using a servo motor:
I am currently living in a college dorm. Like most dorms it’s about the size of a tissue box but less comforting. Fortunately, my room has a heater/AC with four positions: low, medium, high, and off. Unfortunately in winter an hour on the low setting makes the room a stifling 80 degrees and when turned off it drops quickly to 60 degrees. My solution uses an arduino, temperature sensor, and motor to automatically turn the heater on/off to keep the room within a desired temperature range. Not only is this more comfortable but it dramatically reduces the time the heater is used, saving lots of energy. (Also note that the motor is only driven to switch the setting and then turned off so no holding energy is wasted.)
Arduino Thermostat (Mechanical) - [Link]
This instructable will show you how to build a portable Touch Screen Oscilloscope for less than 40 U$! johnag @ instructables.com writes:
The oscilloscope is one of the most powerful electronic instruments that is available to electronics hobbyist, experimenters, and engineers. It is mainly used to measue time-varying signals. Any time you have a signal that varies with time( slowly, quickly, and /or periodically ) you can use an oscilloscope to measure it , visualize it, and to find any unexpected features in it.
Make an Oscilloscope using the SainSmart Mega2560 - [Link]
Raj @ embedded-lab.com writes:
Here is an instructable that describes a DIY shield which would convert your Arduino board into a multifunctional digital multimeter. This shield can be used with “Arduino” UNO und Duemilanove boards, and can display the measurements on a 16X2 character LCD and/or on the serial monitor window on PC. This digital multimeter Arduino shield has the following features:voltmeter ranges : 0-10V; 0-30V; 0-100V ampmeter range : 0-500mA ohmmeter ranges : 0-1KOhm, 0-250KOhm diode, LED, continuity tester LED functionality tester transistor Beta meter.
Turn your Arduino board into a digital multimeter with this shield - [Link]
Printoo is an Arduino-based platform of paper-thin, low-power boards and modules that gives makers new levels of creative flexibility
Printoo is a platform of paper-thin circuit boards and modules. It gives makers an open-source, lightweight, flexible, and modular Arduino-compatible platform to create just about anything you want! What makes Printoo amazingly unique is that it comes with a range of printed electronics modules previously unavailable to the public. These are electronics building “blocks” of the future, only not so rigid.
Printoo: Paper-Thin, Flexible Arduino™-Compatible modules! - [Link]
Movies look cool with those EKG (electrocardiogram), the one that beeps and detects heart activities. A few months ago, we had to shoot a hospital scene for our school project. We needed an EKG instrument. To keep the movie authentic, we didn’t want to fake the readings so we made the next best thing, a pulse monitor. Since my dad is a doctor he gave me some advice to design the pulse monitor.
Homebrew Arduino Pulse Monitor - [Link]
praveen @ circuitstoday.com writes:
In this article we explain how to do PWM (Pulse Width Modulation) control using arduino. If you are new to electronics, we have a detailed article explaining pulse width modulation. We have explained PWM in this tutorial using 2 examples which will help you learn how to control LED brightness using PWM and how to control DC motor speed using PWM.
PWM Control using Arduino – Learn to Control DC Motor Speed and LED Brightness - [Link]
This Instructable will teach you how to use the Arduino Analog ports. johnag @ instructables.com writes:
Digital Voltmeters (DVMs) are a special case of Analog to Digital converters- A/DCs.- they measure voltage – and are usually a function of a general purpose instrument called a Digital Multimeter( DMMs), commonly used to measure voltages in labs and in the field. DMMs display the measured voltage using LCDs or LEDs to display the result in a floating point format. They are an instrument of choice for voltage measurements in all kinds of situations. This instructable will show you how to use the Arduino as a DC DVM (Direct Current Digital Volt Meter).
Make a Mini Arduino programmable 4 channel DC-DVM - [Link]
Jan_Henrik @ instructables.com writes:
In this project i want to show and explain you a range sensor with ultrasonic and a 20×04 lcd screen. I wrote the code for this project myself and added lots of comments, so that everybody can understand it and use it for other projects (maybe a light range sensor?!). It is easy to build and much more easier to program, it just requires a few cheap parts and can run on battery, for a portable rangefinder.
The maximum rated range is 500 cm, the range is measured 20 times per seccond. It is Displayed on a lcd screen which is 20×4 chars big, it has a custom start message, and it can have a custom design while measuring. It will have a backlight LED and can run on every arduino, which has I²C communication. That mean you can run it on an Arduino nano, which is very small. It also requires 5V so it has to be a 5V version of an Arduino.
Arduino ultrasonic range finder - [Link]
smching @ instructables.com writes:
Use a ATTiny85 (can be ATTiny45, ATTiny44) to make an Arduino just for US3.00 and name it as Tiny Arduino.
Tiny Arduino have only eight pins as shown in figure above, Pin4 is ground (Gnd), Pin8 is 5V (Vcc), Pin1 is Reset, Pin2 and Pin3 originally used to connecting the Crystal. In order to utilize all the IO, the internal oscillator (RC Oscillator) is used to replace the external clock which require a crystal. Therefore the Tiny Arduino is now come with five IO. Below shows the Arduino IO functions.
Simplest and Cheapest Arduino - [Link]