FT369 One-Chip Servo Controller

The edeFT639 is an 8-pin chip that will control five servos through one 2400-baud serial line. As you can see from the schematic, the only external components required are a decoupling cap, plus two resistors and a diode to withhold the negative swing of the RS232 line the circuit is connected to. In case TTL-swing (5 V) serial control is available, such as in PIC or Parallax Stamp systems, the control signal to the edeFT639 may be applied directly to pin 4.

Resistors:

R1 = 22k

R2 = 10k

Capacitors:

C1,C4 = 100µF 25V radial

C2,C3 = 100nF

Semiconductors:

D1 = 1N4001

D2 = 1N4148

IC1 = 7805

IC2 = edeFT639 (Elab Inc.; www.elabinc.com)

Miscellaneous:

5 off 3-way SIL pinheader

Evaluation software (VB application) from Elab Inc. website

PCB, ref. 054016-1