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Dear Friends,
I have decided to make my project using PC’s parallel port with my hardware interface to monitor analog voltage at my VDU Screen in digital format max reading in 3 digits that is 999. I am using Microsoft Windows XP as Operating Software with Visual Basic 6.0 as programming software to display digital output on the computer screen.
As we are all aware that LPT-1 port mounted on the backside of every PC having 25 pins D shell connector. Pin no2, 3,4 ... to 9 are D0, D1, and D2......... D7 are the Output and Pin no 10,11,12,13,14,15, are the Input.
I have already made my hardware part and using an ADC IC-7135CN. With multiplexed IC-74LS157.
The IC-7135CN is a 4-1/2 digit Analog- To-Digital Converter design to provide interface to microprocessor. The digital drive output D1 through D4 and multiplexed BCD output B1, B2, B4, and B8 provided an interface for microprocessor.
I am also using IC-74LS157 circuit with IC-7135CN for convergent 8 bit to 4 bit for inputting LPT-1 port in nibble mode through LPT-1 Pin no.10, 11,12,13
I am facing problem for inputting 8 bit data of IC-7135CN with IC-74LS157 through LPT-1 Port to display voltage on computer screen.
Kindly help me. I want to read A to D converter output with 74LS157 as an Interface with my computer through LPT-1 to see the 3-Digit (999) digital readout at my VDU screen.
How we can do with VB-6 Programming & Windows-XP Kindly provides us source code and driver information. Thanks
Adeeb Raza
