• on Computer/Software/Internet
  • Published in issue 7/2012 on page 106
About the article

USB Control Board

USB-to-LPT bidirectional adapter

USB Control Board

There’s still a lot of electronic hardware around that’s designed to be operated from the legacy printer port (LPT) of a PC, but this port is virtually extinct on modern PCs. With the aid of an ATmega88 and associated firmware and software, a relatively fast link can be implemented between the PC and an LPT port via the USB port.

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Products
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.

Resistors
R1 = 10kOhm
Capacitors
C1,C2 = 22pF
C3 = 4.7µF 16V radial
C4 = 100nF
C5 = 10µF 16V radial
Semiconductors
IC1 = ATmega88(P), DIL-28 case
Miscellaneous
X1 = 18.432MHz quartz crystal
K1 = 4-pin pinheader, pitch 2.5mm
K2 = DB25 socket, right angled pins, PCB mount
JP1 = 2-pin pinheader with jumper
PCB # 120345
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