Ultrasonic Collision Detection icon Ultrasonic Collision Detection Stops robot movement (no steering) when an EZB-connected ultrasonic sensor detects an object within a set range; integrates with scripting and paused polling. Try it →

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#1  

That is normal behavior when servos are first powered on.

That is why, for instance, the JD tutorial says to power him up lying on his back so he doesn't fall down.

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#2  

thanks for the info