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Overview

Block Diagram

Analog I/O

Controller

Servo Driver

GPS

Ground Control

Power Converter

Source Code

Telemetry

Servo Driver

Shown below is servo driver module.  The module has the following design features:

Interfaces to standard PWM (Pulse Width Modulation) servo motors used in R/C (Radio Control) aircraft and cars.  The servo update rate is 50Hz or a pulse every 20mS.  The pulse width varies from 1 to 2mS to control the position of the servo motor.  A 1mS pulse moves the servo to a full CCW position, while a 2mS pulse moves the servo to the full CW position.

A separate power converter handles the high surge current required by the servo motors and avoids reset and glitch problems with the main controller.

A high speed serial interface connects the servo driver to the main controller.

Two processors in the system provide a fail-safe, redundant environment.  If communications between the processors is lost, an automatic recovery sequence will attempt to correct the problem.  If a fatal fault is detected, a parachute recovery system is deployed to allow safe recovery of the aircraft.

Includes interface to standard R/C receiver to allow conventional take off and landing with manual control and automated flight once airborne.




Servo Driver.



Schematic / PCB Layout


For best quality, print the schematic on a single 8½ x 11" sheet of paper in landscape mode using your favorite graphics application.

Servo Controller Schematic Servo Controller PCB
Schematic
(Graphic - GIF)
PCB Layout
(Adobe PDF)


Additional information on viewing the PCB artwork, PCB tools, and component libraries is available in the Technology section.

 

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