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6		-= Radio Control Pulse Width Modulation (RC PWM) =
	6	+= RC Pulse Width Modulation (PWM) =
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8	8	RC hobby servo motors have three pins; the black wire is ground (GND), the middle (red) wire is VCC (normally 4.8V to 6V) and the last wire (commonly yellow or white) is the signal wire. The signal wire is meant to receive 5V PWM pulses which are repeated every 20-30 milliseconds. The onboard electronics receive and time these pulses and associate them to angular positions. If no RC pulse is received, the servo goes limp. All RC servos are centered at 1500 microseconds, and 1000 microseconds tends to correspond to -90 degrees, and 2000 microseconds to +90 degrees. Note that by default many handheld RC transmitters only send between 600 to 2400 microseconds (slightly limited range). Pulses which cannot be interpreted by the servo (ex. constant LOW or HIGH) may cause the servo to go limp.
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