Luc Lemmens
About the article

FT369 One-Chip Servo Controller


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.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
R1 = 22k
R2 = 10k
C1,C4 = 100µF 25V radial
C2,C3 = 100nF
D1 = 1N4001
D2 = 1N4148
IC1 = 7805
IC2 = edeFT639 (Elab Inc.;
5 off 3-way SIL pinheader
Evaluation software (VB application) from Elab Inc. website
PCB, ref. 054016-1
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