Monthly Archives: December 2012

Robot Sentry Duty

Obviously, there’s going to be course error buildup. I don’t think encoders would help that much. I’m thinking of navigation beacons, like so: (Maybe infrared? Hmm . . . . )

Posted in Uncategorized | Tagged , , , | Leave a comment

Naked ATMega circuit layout

This is related to the previous entry and shows the circuit diagram and breadboard layout for an ATMega removed from the Arduino prototyping platform after being programmed. The wiring layout on the right isn’t mandatory, of course, but it does … Continue reading

Posted in Uncategorized | Leave a comment

The Naked ATMega

Why take the ATMega328 chip off its happy home on the Arduino to sit naked on a breadboard? Because Arduinos cost $22 while the ATMega328 with Arduino bootloader runs about $1-2 plus a dollar for the support components and a … Continue reading

Posted in Uncategorized | Tagged , , | Leave a comment

Surgery on a servo

Servo drift occurs when the potentiometer shaft (the one on the left in the photo) turns from the centered position (ie 90 degrees). I tried to prevent servo drift by soldering the pot shaft in place, but apparently all I … Continue reading

Posted in Uncategorized | Tagged , , , | Leave a comment

Servo Center Location Test

It looks like the climactic scene in a monster movie, Arduino vs. Bot. In reality, this setup enables me to keep the ATMega328 chip on the Arduino while I upload test programs to locate the servo centers. According to the … Continue reading

Posted in Uncategorized | Tagged , , , , , | Leave a comment

Minigris test matrix demo

This demo shows that the mini grisbot (graphical robotic information system) test matrix has been successfully completed, with photocells and servos functioning and integrated. (And special thanks to Adafruit for the link yesterday.)

Posted in Uncategorized | Tagged , , , , | Leave a comment

Minigris test matrix

Since minigris did not perform as hoped, I’ve had to go back to basics and rebuild the circuit, testing at each stage. Hence a test matrix, where I build the circuit with a component added, write a test program, test … Continue reading

Posted in Uncategorized | Tagged , , , | 1 Comment

AtMega Ohmmeter Designs and Auto-Off Function

I drew up some alternative designs for the casing, like so: The design on the left is a laser-cut version of the robot case. The box design on the right is the utilitarian model, of course. Now for the pushbutton … Continue reading

Posted in Uncategorized | Tagged , , , | Leave a comment

ATMega Ohmmeter

As I get older, it’s harder to read the color bands on resistors, and frankly, sometimes it’s hard to tell the oranges from the yellows and reds, the greens from the blues, and even the browns from the blacks. Taking … Continue reading

Posted in Uncategorized | Tagged , | 2 Comments

Minigris wiring revisions

Well, I did notice that the servos were going to nine volts rather than five on yesterday’s schematic, so I fixed that. Also deleted the connection to AREF per this. But I couldn’t even get the LED to light up … Continue reading

Posted in Uncategorized | Tagged , , | 1 Comment