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Tag Archives: servo
Using LEDs as Test Servos
I fully intended that I would complete all software testing before I removed the ATMega chip from the Arduino even once. However, as I test the software, I’ve had to swap out the ATMega chip from the robot back to … Continue reading
Mini gris servo calibration mode
The robot ‘brain’ (aka ATMega328) needs to know how long the servos must rotate in order to properly execute moves and turns. Hence there must be a servo timing calibration mode, and a way to initiate the mode. I’ve toyed … Continue reading
More surgery on a servo
No, it didn’t crash. I had to disassemble mini grisbot in order to perform surgery on the right servo, whose centering had drifted so much that the wheel could not turn forward. To keep the potentiometer shaft from twisting (thereby … 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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Continuous rotation micro servo
Here are two Hextronik HXT900 microservos which I have modified for continuous rotation. These will provide the propulsion for the latest version of Grisbot. HXT900s are about the cheapest microservos out there. I’m planning to buy mine at Hobby King … Continue reading
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Tagged continuous rotation, grisbot, hxt900, micro servo, servo
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Grisbot in Acrylic, Assembled (sort of)
It looks nice in this picture. But there are big problems. I won’t show the video; it’s way too embarrassing (and I’m wondering how I got the robot to turn so precisely a few months ago!). Even though I trimmed … Continue reading
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Tagged acrylic, grisbot, laser cut, robotics, servo, soldering, wires
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Shortening Servo Wires (aka ‘Cables’)
My robot looked so nice in Sketchup, but that’s because I omitted the wiring. As you can see from the above photo, the servo wires just don’t fit even though I’ve trimmed them once already. I also had to solder … Continue reading
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Tagged arduino, cables, grisbot, robotics, servo, shortening, trimming, wires
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GRIS bot photos
Here she is, the integrated prototype. Note the cowling is fastened on the back and that the breadboard has just the ATMega328, not the whole entire Arduino board. An overhead view showing the arrangement of the servos, wheels, breadboard, and … Continue reading
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Tagged arduino, atmega328, gris, LDR, photoresistor, photos, robot, robotics, servo
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GIRC Demo
On Saturday I made a brief presentation of GIRC at the monthly meeting of the Seattle Robotics Society. I demonstrated drawing the course and running it, as seen in the video above. Where to now? I want to program with … Continue reading
Servo Chatter
When I initialize my robot, the starboard (right-hand) servo chatters at the neutral position. As you can see from the video, for some reason this affects only the starboard servo and not the port (left-hand) servo. I think the reason … Continue reading
