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Thursday, 15. May 2008
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 to a decoder chip to recover the original digital signal (a stream of zeros and ones).

... Link


Tuesday, 29. April 2008
Powershell Article on WindowsNetworking.com

Windows 2008 Powershell... on WindowsNetworking.com.

Nice to see more press for my favorite shell, but... the example commands in this article all use WMI. That's powerful but not the whole Powershell story. What about the drive providers? What about browsing and updating the registry? What about Get-Process and Get-Service? What about the .Net integration? I was disappointed with this article; it could have been so much more.

They do mention at the end that Powershell is more than a Windows Server 2008 feature. It is also available on XP, Vista, and Windows 2003. It really is more than a WMI wrapper and well worth your time to learn.

... Link


Sunday, 20. April 2008
Blue Laser Pointer

DIY Blu-Ray Laser Pointer on Make Magazine blog.

Saw one advertised in Astronomy magazine (January 2008) for USD 1999.00. For a laser pointer? Seems like at that price they could include a DVD player.

(Tried to post this as a comment on the makezine blog. One has tried, one has failed; one can do no more.)

Nice work, I really like the constant current power supply.

... 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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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
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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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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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