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Friday, 31. August 2007
Using WMII

I'm just learning to use WMII. You have to install libixp and wmii together, but you must also install dmenu or you won't get too far. dmenu allows you to run commands, also to quit the Xwindows session. Sometimes that's important.

... Link


Thursday, 30. August 2007
Coin Toss again

William liked the coin toss so much he wants me to build him one. We'll have to build it together after the pinewood derby. Maybe we'll make it more like a mood ring stone, with an ambiguous color that settles to red or green. I'm glad I bought 2 Tiny15L chips. This will use the stock up. I've got plenty of Tiny13's for future projects.

... Link


Monday, 6. August 2007
WOSP Brain Board

I built a board for the Mega8 chip for the WOSP on Saturday. I didn't have a 28 pin socket, so I used a 20 pin socket and an 8 pin socket. The chip fit, so I'm going to go ahead with it. I didn't realize that the power connections on the mega8 are in the center of the chip. I thought they would be pin 14 and pin 28 like the smaller chips. Lucky for me I was just putting headers on the board, didn't have too much rework. I'll use the crystal I just got from Spark Fun for the clock on this board. It will have a serial connection to the host computer, and a SPI connection to the display board and the target chip.

I want to add a 7 segment LED 'sector indicator' to the project, not sure where that will fit in.

... Link


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Biography

Randall Bohn lives in Orem, Utah, USA. He works as a Software Quality Engineer. He is a big fan of the AVR line of microcontrollers. He has been in the computer industry since 1989. Randall is married and has three children.

rsbohn can be reached via gmail.com.


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recent updates
Arduino Starter Kit
MAKE Blog How-to Tuesday posted a challenge: Optimize the sketch code for a pressure sensor bar graph. Here is my second attempt: int gate[] = {10, 20, 50, 100, 200, 32767}; void setup() {DDRB = 0b00111110;} void loop() { int dval = 0; int rval = analogRead(2); for (int x = 0; rval...
12/3/08, 5:42 AM
Measuring Supply Voltage
I'm running my latest handheld computer on solar power. It starts up when the sun rises and runs all day. I started wondering how I could measure the voltage coming in from the solar panel. I came up with a way to use a diode and a resistor and the...
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6/17/08, 12:48 PM
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With a walkable downtown and access to two Universities, Provo Utah is a great location. I live next door in Orem. Kipplinger: Provo: Pristine Tech Mecca (Video) (Text)
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There is a new release of the AVRISP emulation sketch for Arduino: avrisp.02.zip. This one should work with Mega8 and Mega168. mega-isp
5/28/08, 4:48 PM
Sorting Out Page Sizes
There is a new release of AVRISP Emulation for Arduino. This is an Arduino firmware that allows you to program other AVR microcontrollers. The new zip file (avrisp.01.zip) should compile on the current Arduino IDE, and I changed the comments that put the wrong labels on the SPI pins. Go ahead...
5/27/08, 11:31 AM
Flash Problems
I'm building a project using the AVR ATMega8 microcontroller. Once I got the thing wired up to where I could write firmware to it I found that it was always failing. I made a .hex file full of 0x10 values (256 bytes worth) and tried uploading that to the chip....
5/16/08, 2:56 PM
William's Arduino Board
I'm building an Arduino-compatible board for William. I'm building it on the Evil Mad Scientist MegaXX8 business card. It will have four built-in LEDs and a USB interface. It will also have connectors so he can use it with a breadboard. Perhaps we can connect it to some of his...
5/15/08, 7:26 AM
Cybord Signal Detector
Some digital radio signals use Frequency Shift Keying (FSK). This often has one frequency for a Mark and one for a Space. I plan to build a cybord or other chip that will decode an FSK signal, producing three different values: NO_SIGNAL, MARK, and SPACE. The signals would then go...
5/15/08, 7:20 AM

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