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|Descr:||Universal paralel I/o for PC|
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Universal Parallel Input/Output for PCs
Hardware design by D. Aggelos
Here's a simple project with Windows control software that allows you to control up to eight relays or other actuators, and read back an equal number of input lines, all by means of the parallel port on your PC.
R9 820 9 C2 100µ 25V C3 100n C4 100n 11
IC4b 1 IC4c 1 IC4d 1
4 D1 6 R1 22 8
RE2 D2 R2 22
IC4e 10 1 IC4f 1
The UPIO software and hardware (a board attached to the PC's parallel port) allows you control up to eight relay outputs using a Windows-style user interface designed for user-friendliness. UPIO also allows you read back logic states on input lines.
12V IC4 = 74LS05 12V IC4a 2 1
The circuit that belongs with the UPIO program is very simple and consists of a few low-cost and easy to find parts. The circuit diagram is given in Figure 1. A tristate buffer type 74HCT241(IC5) arranges all |
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