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Good LED Bad LED

I put some LED's on the WOSP circuit board, just to see how they would fit. Unfortuantely one was bad, so I had to pull it off again. I bought more LED's, tested them, and added them to the board. circuit board with LED's I also added a battery so I could test components out right on the board. I don't think a small 3V battery will run the whole thing, so I 'll probably add a 7805 5V regulator and some external power lines.

I'm tired of the perfboard already. Next time have to get a circuit board fabbed instead.

I want to get at least one state completed so I can connect it to the Arduino and try it out. This is the biggest homebrew project I've ever undertaken and I really am developing some new skills as I go.

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Building the WOSP

Started melding solder again last night in an effort to build my way old-school programmer. Mounted the sockets for the buffers for the data and address indicator lamps. Then I started routing the data bus. This is more work than I like...

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Two Mega8 processors for WOSP?

My first idea was to use one processor for the Way Old-School Programmer, but I'm not sure I have enough IO pins for all the lights and switches I want on it. I thought of using the Tiny2313, but maybe I'll go ahead with two Mega8's. It would make the programming easier in one specific way: All the IO gets processed by one chip (update the lights, read the switches, over and over again). The second processor runs two SPI channels, one to the IO processor, the other to the chip you want to program.

Anyway, I've got the switchbank bolted together and wired up. Bought some perfboard, so I'll start working through that part of it. I plan to mount the LED's on the circuit board and connect the switchbank using a header (leftover from the Arduino protoshield). This is so much fun!

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7305 days of detection
mod: 12/3/08, 5:42 AM

days of detection

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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

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August 2022
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...
7/29/08, 9:53 AM
Ten Pin ISP adapter
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7/16/08, 10:00 PM
Hello 5x7 Style
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6/17/08, 12:48 PM
Provo, Utah
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)
6/2/08, 10:07 AM
Another release of AVRISP sketch
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5/28/08, 4:48 PM
Sorting Out Page Sizes
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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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