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USB Control Board

USB-to-LPT bidirectional adapter

USB Control Board
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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Materials

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.

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PCB

Component list

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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