Uwe Altenburg
About the article

USB-IO24 Cable

Use your PC for measurement, control and data conversion tasks the easy way

Based on a Labs project | August 2012 | Find it here
USB-IO24 Cable
Transferring up to 24 digital signals using your computer’s USB interface is simple with the multifunction cable described here. You can also sample up to eight analog signals, generate PWM and servo signals and more besides. This article offers a simple protocol for controlling the cable and covers PC programming in the C# language as well.
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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


(SMD 0805, 5%) R1= 100kOhm R2 = 4.7kOhm R3 = 100Ohm


C1,C2,C5 = 100nF 50V, 10%, X7R, SMD 0805 C3,C4 = 22pF 50V, 5%, NP0, SMD 0805


D1 = LL4148 (Minimelf) IC1 = R8C/25 (SMD TQFP52)


USB/TTL Adapter cable TTL-232R-5V-WE, Elektor # 080213-71 [6] K1 = 25-pin Sub-D socket (Amphenol type 77SD B25S) K3 =10-way MicroMatch connector, with underside solder connections (TE Connectivity/Amp type 8-215079-0) X1 = 18.432MHz quartz crystal, 18pF, 50ppm Shell for 25-pin Sub-D connector, flip top (Assmann type A-FT 25)


10-way MicroMatch plug (8-215083-0 TE Connectivity/Amp)

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