Tag Archives: servo

Converting a micro servo to continuous rotation

Say you want to build a small robot, but you soon discover that DC motors move too fast and geared DC motors are too expensive. Then you hear about servos. Servos are basically geared DC motors, and microservos seem just … Continue reading

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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

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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

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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

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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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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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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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