20 Apr 2007 jkkroll   » (Master)

From the “Because I can” Department…

While waiting for my RF boards to arrive from Sparkfun, I started another project (ooh, look! Something shiny!). I have always liked building things that I could carry around with me, so I decided to build my own PDA. I had the graphic LCD and plenty of processors laying around. I figured adding an RF link back to the PC would not only make it more functional but also help produce code that would be useful for the Spoka project. I also figured that I could combine it with my Tricorder project (notebook pages 3-12) and add as many sensors as I could fit in this little OKW enclosure.
Inside Size Comparison Screenshot PC RF Base

The processor is an ATMega32. I have added a 128 X 64 graphic LCD, a 2.4GHz RF Transceiver, battery-backed real time clock, 2 axis accelerometer, linear Hall effect sensor, and a white led flashlight. The IR receiver is not connected yet. I still plan to add an RGB color sensor and an IR transmitter.

The source code was compiled with WinAVR and is available here. The library for the graphic LCD is from Gregor Horvat (http://www.indata.si/grega/) for the compatible HD61202 controller. After updating a few deprecated commands, it worked first time! I can’t remember where I got the library for the DS1307 clock that I converted for the DS1305. If anyone recognizes it, please let me know. The defines for the NRF24L01 came from S. Brennen Ball.

As you might be able to see from the screenshot, I am currently reading the battery voltage (upper left), magnetic field strength (upper right), x and y acceleration (lower left), and the current time (lower right). The cross-hairs and “bubble” in the center of the screen form a 2-axis level. See the picture of it in my hand for an example with the unit tilted on one axis. The RF transceiver is working well and capable of exchanging data with a PC base unit that connects via serial at 115200 baud.

(BTW, my order arrived from Sparkfun, but I’m having so much fun with this project, I may not get back to Spoka)

Syndicated 2007-02-25 08:51:53 from robotguy.net/Blog

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