Here are some commercial products that simplify the task of driving RS servos.

• Digital-Input Servo Controllers
  • Parallax Servo Controller (Serial)
  • Parallax Servo Controller (USB)
  • Scott Edwards Electronics Inc. - Mini SSC II
• Analog-Input Servo Controllers
  • DIY Electronics Kit 102

• Related Pages

• Parallax - Parallax Servo Controller (Serial)

  

  • Uses TTL-level serial port to communicate with controlling intelligence.
  • Runtime selectable baud rate: 2400 to 38k4 Baud.
  • Controls up to 16 servos. All servos driven simultaneously all of the time.
  • May be networked together so that two PSC's can control 32 servos using a single I/O line.
  • Servo ramping: 63 ramp rates. Speed range for 0 - 180 degrees of rotation is 3/4 of a second to 60 seconds.
  • User may request position of an individual servo at any time.
  • 16-bit PWM timers enables 0 - 180 degree servo rotation at 2 microseconds per step.
  
  

  Sources:

  Parallax

  #28023

  Parallax Servo Controller (Serial)

  $39, with two free servos [4/2005]

• Parallax - Parallax Servo Controller (USB)

  

  • Uses USB port to communicate with controlling intelligence.
  • Runtime selectable baud rate: 2400 to 38k4 Baud.
  • Controls up to 16 servos. All servos driven simultaneously all of the time.
  • May be networked together so that two PSC's can control 32 servos using a single I/O line.
  • Servo ramping: 63 ramp rates. Speed range for 0 - 180 degrees of rotation is 3/4 of a second to 60 seconds.
  • User may request position of an individual servo at any time.
  • 16-bit PWM timers enables 0 - 180 degree servo rotation at 2 microseconds per step.
  
  

  Sources:

  Parallax

  #28823

  Parallax Servo Controller (USB)

  $39, with two free servos [4/2005]

• Scott Edwards Electronics Inc. - Mini SSC II

  

  • Fully assembled module.
  • Control up to eight servos.
  • Connects to computer using RS-232 serial port at 2400 or 9600 bps.
  • Phone-style jack for serial hookup.
  • Futaba-J servo output headers.
  • Sync LED to indicate when valid data is received.
  • Switchable servo range/resolution (90° range with 0.36° resolution, or up to 180° motion and 0.72° resolution).
  
  

  Sources:

  http://www.seetron.com/pdf/ssc.pdf

  #SSC-ASD2

  Mini SSC II

  $44 [4/2005]

• DIY Electronics - Kit 102 - Servo Motor Driver

  

  • Uses a PIC 16C71, a crystal, 8 resistors & 4 capacitors.
  • Kit will independently control up to 4 servo motors.
  • 5V DC power supply required, capable of delivering an amp
  • Output is a 5V pulse between 1 and 2 msec long, repeated 50 times per second (20msec frame rate).
  
  

  Sources:

  Quality Kits	#QK102	Servo Motor Driver Kit	$17.95 [7/2005]
  Circuit Specialists Inc.	#KIT 102	Servo Motor Driver	$24.95 [7/2005]

  Related Pages

  You may be interested in these related pages:
  • RC servos
  • Commercial RC servo drivers [this page]
  

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