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--- ideas:circuits [2007/01/11 23:24] – rocketboy
+++ ideas:circuits [2008/07/19 23:33] (current) – external edit 127.0.0.1
@@ Line 5: / Line 5: @@
+===== RC Servo Interface =====
+The Servos used for remote control model aeroplanes and helicopters are an obvious choice for controlling equipment in high altitude payloads (such as camera control and steerable recovery systems).
+{{ideas:rcservo.jpg|}}
+Servo typically have 3 wire interface:-
+  * Ground		(typically Black)
+  * Power (4.8V) 	(typically Red)
+  * Control		(typically White)
+Some connectors have a key-way next to the control wire.
+The control signal takes the form of a pulse train – nominally with a period of 20ms – but anything in the range of 18 to 25ms should be expected to work. The pulse length is varied to set the position of the servo – 1ms equates to a position at one end of travel – 2ms to the other end of travel – with 1.5ms being a central position.
+{{ideas:pulse.jpg|}}
+===== RC Rate Gryos =====
+The Rate gyros used in model helicopters conform to the same interface as RC servos.  Normally the control for the RC system is passed though the Rate Gyro before being applied to the servo – that way the rate gyro can modify the pulse width (typically to stabilise yaw in a model helicopter)
+{{ideas:rategyro.jpg|}}