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Step Exercises

Stepper motor driver for the ElektorBus

Step Exercises
The ElektorBus opens up a wealth of possibilities in areas from home automation to instrumentation. The modular hardware and software makes it easy to build your own applications. Here we extend the ElektorBus ‘toolbox’ with a board to control a stepper motor.
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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.

Download the BOM list
The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.
Component list
R1 = 0 Ohm
R2,R12,R15 = 39kOhm
R3 = 680Ohm
R4 = 100Ohm
R5,R23 = 100kOhm
R6-R11 = 1.0 Ohm (Vishay CRCW25121R00FKEG)
R13,R19,R20 = 10kOhm
R14 = 10Ohm
R16,R18 = 0 Ohm (see text box)
R17,R21 = not fitted (see text box)
R22 = 120Ohm
R24,R25 = 10kOhm, optional (see text box)
R26 = 4.7kOhm
P1 = 10kOhm trimpot (POT4MM-2)
(default shape: 0805)
C1 = 68?F 10V tantalum (AVX TPSB686K010R0600)
C2 = 470?F 35V electrolytic (Panasonic EEEFK1V471AQ)
C3,C5,C8,C12 = 10nF
C4 = 1000?F 50V electrolytic (Panasonic EEVFK1H102M)
C6 = 68nF
C7 = 220nF
C9 = 5.6nF
C10,C11 = 1nF
C13,C14,C17 = 10?F 6.3V (AVX TCJA106M006R0300)
C15,C16 = 100nF
C18,C19 = 22pF
L1 = 47?H (744773147)
D1 = B160-13-F, Schottky diode 1A / 60V
D2,D3,D6 = Diode 1N4148
D4,D5 = BZX384-B5V1 5.1V zener diode
T1 = BC849B, SOT-23
LED1 = LED, green (5988270107F)
IC2 = L6208D (SO24)
IC3 = ATmega328P-AU
IC4 = LT1785CS8
JP1 = 6-pin (2x3) pinheader, 0.1’’ pitch
JP2,JP3 = pinheader, SIL, 0.1’’ pitch
K1-K9 = PCB screw terminal block, 0.2’’
Rel1 = relay, SPDT, Omron G5LA145DC
S1 = pushbutton, Omron B3S-1000
X1 = 16MHz quartz crystal, 50ppm, 16pF, Epson Toyocom FA-365
PCB 120509-1

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