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1  Using Arduino / Motors, Mechanics, and Power / Re: Relay becomes unresponsive after switching air bed pump on: October 10, 2012, 04:15:54 am
Thanks all! MarkT, your argumentation seems logical. I'll order parts and try the MOSFET approach.
@mauried, the Arduino is powered over USB, the relay is being switched using a separate 5V power supply and the motor is on an isolated 12V circuit.
2  Using Arduino / Motors, Mechanics, and Power / Relay becomes unresponsive after switching air bed pump on: October 09, 2012, 05:35:49 pm
Hi there,

I am working on a project where I need to switch an air bed pump (http://goo.gl/IGBvR) that draws 4500mA. I am using a 5V relay, that can switch up to 16A on 30VDC.

Everything is working as it should, until I connect the motor. After about a minute, sometimes more, sometimes less, the relay becomes unresponsive and stays closed. There is no way to release the relay other than resetting the Arduino.

This thing is really driving me nuts  smiley-confuse Hopefully someone here can point me in the right direction smiley I attached the schematic.

Thanks in advance!

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