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.
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.
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