Hitec HS 303: Robotic Servo Motor

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Presentation transcript:

Hitec HS 303: Robotic Servo Motor Contact Info David Kusinsky dak217@psu.edu AIM: SparusX Hitec HS 303: Robotic Servo Motor Uses Pulse Width Modulation EE/CE Description Mechanical Description Test Circuit Jameco Part No: 157067 - $19.95

Image courtesy of battlebots.com Uses Hobbyists (model airplanes, cool Lego toys, etc.) Robotics! Image courtesy of battlebots.com

Pulse Width Modulation Duty Cycle => Proportion of time that a device is operated vs. idle. In this case, duty cycle is: time ‘1’ / interval Basic Idea of PWM: Keep frequency constant, and vary the duty cycle. Ex. 75% duty cycle

EE/CE Description Servo functions through a pulse width modulated control input. (50 Hz square wave) Duration of logic ‘1’ (duty cycle) determines angle of servo axis. Varies by manufacturer: HS-303 1.00 ms – 0 degrees 1.50 ms – Center 2.00 ms – 90 degrees Potentiometer (POT) connected to servo axis allows control circuitry to monitor servo’s position.

Mechanical Description Control Circuitry, Motor, Gears, and Case Three Wires: Red (+4.8-6 VDC), Black (0 VDC), Yellow (Control Signal) High Torque vs. Size (42 oz-in @ 4.8 VDC, 49 oz-in @ 6.0 VDC) Speed @ 60 degrees (0.19 s @ 4.8 VDC, 0.16 s @ 6.0 VDC)

Test Circuit 555D => ST NE555N 555 Timer R1 & R2 => 10k POT C1 => Filter Cap. C2 => Trigger Cap.