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Author Archives: engineerzero
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
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
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Tagged arduino, atmega328, micro servo, minigris, robotics, servo
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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.)
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Tagged arduino, atmega328, mini grisbot, robotics, test matrix
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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
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
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
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
Mini gris on a mini breadboard
Here is the wiring diagram for the mini gris mini breadboard. As soon as I post it, I’ll realize there’s something wrong. So we may as well get it over with.
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Tagged breadboard, grisbot, minigris, robot, robotics, wiring diagram
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Minigris Assembly Begins
I went to Metrix this afternoon (Thursday) and got the acrylic cut, and then I rushed home and attempted to assemble the robot. Here are the pieces with the protective wrapping still on them: Ten minutes later, I’m still peeling … Continue reading
Grisbot test rig
When I finished assembling this test rig on late Tuesday night, I sat back and stared and realized that maybe I’ve actually accomplished something. Such a weird feeling! The test rig is mounted on a small kitchen chopping board that … Continue reading
Engineer Zero 