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{assume arming is done} Can i connect the brushless ESC to any digital pin and give writemicroseconds() to it? Will this work. because i have connected my 4 ESC's to "~" pins. so i thinks that other will not work.

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It should work.

The Servo library doesn't use hardware PWM, so you can connect them to a non "~" (PWM) pin.

  • Yes, RC servos can be attached to non-PWM pins, but a “brushless ESC” is not an RC servo but instead a PWM-controlled Electronic Speed Control for brushless DC motors. – James Waldby - jwpat7 Oct 13 '15 at 4:44

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