adafruit.com writes: [via]
Converting an Arduino to 3.3V – All official Arduinos run on 5 volts, which for a long time was the ‘standard’ voltage for hobbyist electronics and microcontrollers. But now the coolest new sensors, displays and chips are 3.3V and are not 5V compatible. For example, XBee radios, and SD cards and acellerometers all run on 3.3V logic and power. If you tried to connect to them with 5V you could damage the internals of the accessory. We use chips like the CD4050 to do level conversion but if you are using a lot of 3.3V devices, maybe you’re just better off upgrading the entire Arduino to run from 3.3V! To do that, we will replace the regulator so that the DC barrel jack for a 3.3v type, and then reconfigure the 5V usb power line so it goes through the regulator as well.
Converting an Arduino to 3.3V – [Link]
Getting Started with Arduino (in Praise of Adafruit) @ Continuations. Albert writes – [via]
I am currently reading James Gleick’s “The Information,” which I highly recommend (more on that in a separate post). In it is a wonderful chapter on Babbage and Lady Ada Lovelace, which makes it clear how amazing her insights into what we would call programming were by placing them in their historical context. What does any of this have to do with Arduino? Well, I ordered our Arduino kit from the wonderfully named Adafruit in New York which was founded and is run by Limor Fried.
I can wholeheartedly recommend the entire experience. Ordering off the site is easy and fulfillment was incredibly speedy. The basic Arduino Experimentation Kit contains everything you need to get going and do so without any need for soldering. It comes with a simple plexiglass platform on which you mount the Arduino board with a couple of screws and next to it a breadboard which has an adhesive backing. All of this is accomplished in minutes. The instructions that come along are clear and easy to follow. The cut-out wiring diagrams are in color and fit the bread board perfectly.
Getting Started with Arduino – [Link]
Mike Chambers writes:
Here is how it works. I have an Arduino Duemilanove with ATMega328 which has two photo-resistors connected (with a 10k pull down resistor). I set up two laser pointers to shine a laser directly onto the photo-resistor (which is enclosed within a dark box). The Arduino monitors the values returned from the light sensor, and watches for any changes that indicate that the laser bean has been broken. When both laser beams are broken, the Arduino calculates the amount of time between when each sensor was tripped. It then sends that value to the Adobe AIR based client, which is connected to the Arduino via USB / Serial port and a serial port proxy (in the case, TinkerProxy).
Arduino based speed detector with a Flash! – [Link]
Tokyo Hackerspace has developed a Geiger shield for Arduino, designed to work with the RDTN/Pachube radiation detector project. Akiba writes: [via]
This is an Arduino-based geiger counter shield that makes it easy to upload data to the internet and also interchange tubes. Since it’s open source and Arduino-based, its also easy to hack this to other interesting applications.
Tokyo Hackerspace Geiger Shield for Arduino – [Link]
Detect Alpha, Beta and Gamma radiation integrating any Geiger Tube and read this levels using Arduino. As well as from the terminal, the radiation levels can be shown using different actuators.
In order to improve the design along with the software application participation in the Forum is appreciated.
Radiation Sensor Board for Arduino – [Link]
JeeLabs has a product known as the JeeNode v5, which is essentially a miniature Arduino (Atmega328p) board with an onboard RFM12B wireless module. Boards are available with the serial interface (shown above) as well as USB.
While it’s not an Xbee compatible RF unit, the RFM12B has its own RF12 library of functions which should help you accomplish many control and data transfer tasks.
JeeLabs JeeNode combines Arduino, RF – [Link]
Yes, this is more or less your average touchpad that one can find from inside a laptop. This model, like majority of touchpads out there operates with PS/2 standard. This means that it can be directly plugged in to a PS/2 connector and with proper drivers, function as a mouse.
As it happens the PS/2 communication is not that difficult to achieve with an Arduino board. Kristopher has written an Arduino/Wiring library that offers all the functionality that we need at this point.
Arduino + Laptop Touchpad – [Link]
This device captures the IP address of your network and it publish on site DynDNS.com. All without PC. It allow a remote access to your LAN even if the IP address of the connections changes. If you don’t want to use the software provided by DynDNS, and then leave the PC switched on continuously, the solution is this project. Our device queries the site http://checkip.dyndns.com/ to know the IP currently used for the connection, and then publish your free account to www.dyndns.com instead of the computer acquired the new IP. Such a device therefore allows to locate a LAN connected to the Internet via a router or modem network. All schematics file, pcb anche arduino sketch on
Arduino DDNS (Dynamic DNS) – [Link]
Mario writes: [via]
To show the basic principal I used a remote wall socket which normally is switched with a remote via a radio frequency of 433 MHz. What I wanted was to have an Arduino controlling the remote switch to turn on/off the wall socket.
Mario started with a commercial remote wall socket normally operated by RF, and hacked it by replacing the RF controller with a 4N35 optocoupler to open and close the switch.
All that was left to do was to write an Arduino sketch that listens to the Serial port for incoming data to switch the circuit, a small desktop program which transmits the control data, and as a bonus a small Android app which sends the switching state to the desktop program. To prepare your device/remote for being switched externally, you first have to desolder the buttons. In my remote the circuit layout was pretty simple and I could desolder the buttons pretty easily.
Android / Arduino controlled remote wall socket – [Link]