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Resolved Resolved by DJ Sures!

Servo Jumping On Initialisation

The dreaded jumping servo problem has arisen again - just today. All servos in the robot are HDD. The servo on port D0 now jumps after connecting, to about 35 degrees instead of 90 degrees. If I move the servo manually when turned off, the centre position is still 90 degrees, so the sprocket has not shifted. My INIT script has not changed. That servo is set to 90 degrees. Has anyone had this problem before? I am thinking I might have to replace the servo and see what happens. My previous problems with jumping servos were because I had a HD servo. But not this time.



Related Hardware (view all EZB hardware)
EZ-B V4 by EZ-Robot
EZ-B v4/2 robot controller: dual Cortex ARM, Wi-Fi, audio/video, 24 servo/digital ports, I2C/UART, camera and Synthiam ARC control for custom robots
Wi-Fi / USB
Servos 24
Camera
Audio
UART 3
I2C
ADC 8
Digital 24

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#17   — Edited

I had similar problems this morning, servo would jump violently ,could not figure out why, thought I had a stripped plastic ez bit attached to servo on Six leg .Turns out it was worse, the top metal gear had about 3 teeth worn down inside HD servo,but I had a spare old blown HD servo,just used that top gear and transplanted to make 1 good. Wondering if that wearing does come from violent start up on servos. Only does that once in a while but still...Oh also make sure your battery has good charge or servos will start jumping,noticed that could be why I had problem.