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Author Topic: Arduino UNO stopped powering the Servo !?  (Read 598 times)
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I am powering UNO via USB (no external power supply), and driving HS-422 servo..

I worked on it for hours, and everything was alright, until suddenly the servo stopped responding !.. I noticed that it is now free-to-move as if it is not connected !  (I have connected it to 5V and its GND - as before) -

I don't have the equipments right now to measure the voltage or check the servo, but please suggest what should I do, and what could be the problem?

Thanks..

PS. I try connecting the +Servo to 5V socket with the wire and right when it touches it gets the power (for less than a second).
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I noticed that it is now free-to-move as if it is not connected !  (I have connected it to 5V and its GND - as before) -

The USB port on a computer is marginal for powering a servo with no load, and when under load may trip the USB port power fuse in the computer. If the arduino has no lit LEDs, try rebooting the computer.
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Consider the daffodil. And while you're doing that, I'll be over here, looking through your stuff.   smiley-cool

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It is asking for trouble to power a motor from the Arduino's regulated supply - motors and sensitive digital electronics do not get on due to the high-voltage spikes and crow-barring stall currents that motors can generate.  Use a separate battery to power the servo.
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