Check out the Atmel AVR temperature controller hack, although I made a better one last year that can be controlled via ethernet, the case looks awesome!

Wine doesn’t like subzero temperatures, and during wintertime, my “winecellar” got pretty cold.
There was an electric heating element, but the thermostat was broken, so it was either full burn or nothing.

That’s how the temperature monitor/controller came to be.
It was an obvious task for a small processor and I’ve always wanted to test the Dallas temperature sensors.

So, I designed this little device which could monitor the temperature and control the heater.

via Aboutmicrocontroller.blogspot.com

Check out the Part 3 of “HOWTO make sounds with Ardunio” and learn to play melody.

Bit-Banging Sound
To bit-bang sound we toggle an output pin at the desired frequency. To play a musical note, we need to use specific frequencies and play the sound for a specific amount of time.

Generating the desired frequency big-bang style means figuring out what the period or cycle time of the desired frequency is. This is easy to calculate, it’s the reciprocal (1/F) of the frequency. As we found in part 2, 1KHz is 1000 cycles per second. So, one cycle takes 1 one-thousandth (1/1000) of a second or 0.001 seconds (1 millisecond). We need to toggle the pin at this rate so we want to keep it low for 1/2 the time then high for 1/2 the time. Therefore we want to set the I/O pin low for 500uS, then high for 500uS and do this over and over for as long as the duration requires.

Part I and Part II

via uchobby

Related Posts:

HOWTO make Beer Thermostat with Arduino

Here’s a cool audio and video controller DIY using Arduino.

Click Here to View in Full Screen Mode

This is kinda cool way to control an LCD hooked up to Ardunino with browsers including your mobile phone.

In conclusion, this code may be pretty ragged, but the concept is what is important and it should be enough to get you started. You obviously can’t do anything too intense with this. It could be used to do some simple but cool things though such as controlling your house from your cell phone, or feeding your dog or cat over the internet, etc. Once again, please e-mail me if you need help getting it working for your project.

via MakeZinE

Related Posts:

DIY- How to make an ethernet temperature controller with Visual Basic

So, you want to make some sounds with the Arduino you just bought last Friday? Check out uCHobby as they show you how to do some basic stuff with sound and Arduino including how to make “Hello World” sound using a PC speaker.

This is the second in a series of articles about generating sound with an Arduino. The first article covered the various methods available for sound generation with an Arduino. In this article we take a small step; “Hello World” for Arduino sound. We prepare for our future experiments by hooking up a PC or powered speaker so we can hear the Arduino sing.

Arduino Sound Part I

Arduino Sound Part II

Click Here to View in Full Screen Mode

Wow, check out this instructable on HOWTO make your own 360 degrees panoramic photo-bot!

this is my 360 panoramic photo robot, the idea is shooting in 360 degrees in the smaller time as possible without errors, take the panoramic in a hard conditions and fun!.

this project i take a 1 month and i am implementing improvements, and i use parts of bad cd-roms and hard disk drives.

i hope that it serves to construct your own robot or can leave ideas for another project.

via Make

Into AVR chip programming? Check out how you can convert an Arduino into an AVR chip programming hardware for use with AVRDude!

By the way, AVR is microcontrollers from Atmel. Check out AVRFreaks for good AVR info.

(Thanks David for the tip! )

I ported the Atmel AVR910 In System Programmer protocol to the Arduino. Now I can write programs to my ATtiny2313 and tiny13 chips. The Arduino sketch is available for download here. It works with the AVRDude programming software. This article will show how to use the Arduino to upload a program to the tiny13. The first step is to download the zip, extract the .pde file, then load it into the Arduino IDE, and write it to the Arduino. Next we can hook up the tiny13 chip.

The original AVR910 programmer didn’t support the tiny13 chip. I added tiny13 support to the Arduino version and assigned it part ID 1. I had to modify the avrdude.conf file also. I just added the following line

via uCHobby

Help Max start a business on OneBuckWiki by investing 10 bucks today!  (or 5 bucks at FiveDollarWiki)

a href=”http://vimeo.com/359554/l:embed_359554″>Launch and Retrieval from natrium42 on Vimeo.Check out this DIY Balloon that made it 30km!

High altitude ballooning is an emerging hobby, since price of GPS and communications equipment has gotten quite low. It is an excellent hobby for people fascinated by space flight and telerobotics and has many learning aspects — from systems design to electronics design to software engineering. There is also an exciting risk factor, namely, that you could lose your precious electronics if something malfunctions. In this project, many of my interest and knowledge areas came together. Also, I have verified that the Earth is indeed round and that space is black.

Bre Pettis of MAKE also built and launched a near-space balloon, but never found it. See his videos (part 1 and 2).

via Boing…Boing

Click Here to View in Full Screen Mode

Cool nice little wiimote Robot…

This robot is composed of Legos and uses a handyboard as the control hardware. It has 4 wheel drive each controlled by a lego motor, and a pan tilt mount for directing light and the video camera. The Wii Remote talks to a MacBook Pro over bluetooth to modified DarwiinRemote software, and the computer in turn communicates with the robot over a serial port. This robot was designed for and used in a small scale demonstration of Urban Search and Rescue (USAR) as an assignment in Intro to Robotics at Carnegie Mellon University. Designed, built, and programmed by Andrew Hundt, Boris Lipchin, and Ned Fox at CMU.

via

This project deserves an A++ for making something related with beer! As I am gulping a Budweiser 40 down my throat, I find this email in my inbox about HOWTO make a Arduino Beer Thermostat! Cool… Keep up the great work David and thanks for the tip!

I belong to a diverse group of amateurs who have a fascination for brewing our own beer. In addition to the satisfaction of brewing the beer I drink, and the control I have over the process (and the ability to easily avoid crappy mega-swill beer from the big breweries), we homebrewers get to play with a bunch of cool gadgets. Even if you don’t have any interest in cooling beer, this information in this tutorial can be applied to other projects that involve analog sensors, and high-voltage/current devices.

Over the past few months, I’ve started kegging my own beer, at home. This is a pretty simple process, but one of the key ingredients to making consumable draught beer is temperature control. Obviously, beer doesn’t taste quite as good if it’s warm (or too cold, for that matter), but there’s more to it: carbon dioxide is much more soluble in water (or beer) at lower temperatures, so it’s essential that kegs be kept cold, when serving.

Most homebrewers take one of three approaches to cooling their beer: buying a pre-made kegerator, gutting a regular refrigerator to hold kegs with taps on the door, or altering a chest freezer to hold the kegs and mount taps. I chose to take the third approach (a friend was getting rid of a near-perfect sized chest freezer).

Generally, chest freezers have thermostats that work in the “freezer” range. That is, below 0ºC, or below water’s freezing point. Even at the “warmest” temperature, most freezers will still freeze beer. This is no good when it comes to kegerators. Many homebrewers solve this problem with a device referred to as a “Johnson,” “Love,” or “Ranco” controller (depending on the brand of controller). Basically, this device plugs between the AC mains and the chest freezer, and has a temperature probe that is placed in the freezer (the freezer’s internal thermostat is set at “maximum cold”). The temperature probe, depending on the model chosen, will either be a solid/liquid mechanical probe (usually found on the cheaper controllers–this is likely the same type as is found on the freezer’s internal controller), or a thermistor.

One day, a few weeks ago, I had the urge to finally get my chest kegerator cooling my beer. Living in Canada has its benefits, but one of the recurring problems we Canadians face is the difficulty (and delay) in having items shipped from the US (where most of these controllers are made/sold). I wanted to get it working now, not in a week, or more, when a controller would arrive. Additionally, these controllers can run for anywhere from $60-200. I didn’t feel like waiting, and I didn’t feel like paying. So, what’s a resourceful geek supposed to do? Build your own, of course.

via uCHobby