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Synchronous Servos

Tracking control with ServoMagic

Synchronous Servos
Model servos are frequently used in robotics projects because of their unique properties. However, a significant disadvantage is that servos often change position far too quickly. In addition, each servo moves at a slightly different speed, which results in erratic looking movements. In these situations it would be nice if all connected servos would move simultaneously and with a user-defined speed to the next position. This synchronous servo control (called ServoMagic) is the solution for this problem.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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.

R1 = 100?
R2 = 330?
R3 = 10k?
R4, R10-R19 = 1k?
R5 = 100 k?
R6, R7 = 4k?7
R8, R21 = 47k?
R9 = 470?
R20 = 1? 1W
C1 = 4?F7 10V radial
C2, C3 = 27pF
C4 = 220nF
C5 = 10?F 16V radial
C6, C7, C9 = 100?F 25V radial
C8, C10, C11 = 100nF
D1 = 1N4148
D2 = LED, 3mm, green
D3 = 1N5401
IC1 = IR receiver (see text)
IC2 = AT90S2313-10PC, programmed for RS232, order code 020031-41)
IC3 = 78S05
IC4 = 78L05
T1,T2 = BC547B
JP1 = jumper
K1 = 9-way sub-D socket (female), angled pins, PCB mount
K2 = 10-way pinheader
K3 = connection for IR receiver
K4-K13 = 3-way pinheader
S1,S2 = pushbutton, 1 make contact
X1 = 4MHz quartz crystal
Heatsink for IC3, e.g., FK237, ICK35
2 wire links
RS232 cable, straight-through (all wires 1:1 connected)
PCB, no. 020031-1 from The PCBShop
project software, code 020031-11
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