Dragon Tamer
Member
I've been working on an ADC for the parallel port of my computer, and I've hit a road block. The ADC is supposed to use 8 D-type FF to enable up to 4 channels. I use a 74LS161 instead because I was testing and I already had some on hand. I have checked that the counters are connected properly and they are, with a preset input they change to the input on a high going clock pulse.
The computer is a Sony Vaio 2002 model with a 1.67GHz processor and 512MB of RAM.
The problem that I am having is with the test program. It is GW basic and the test code is as follows:
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But I have entered this program several times and it never works, can someone help me figure out what is wrong?
The schematic of the ADC is as follows:
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Please note that I didn't wright the code or design the schematic the original website is http://www.simprojects.nl/index.htm
The computer is a Sony Vaio 2002 model with a 1.67GHz processor and 512MB of RAM.
The problem that I am having is with the test program. It is GW basic and the test code is as follows:
Code:
10 OUT 888,128
20 OUT 890,11
30 out 890,4
40 out 890,11
50 input "dac1 value ", A
60 input "dac2 value ", B
70 input "dac3 value ", C
80 print""
120 Out 888,A
130 Out 890,10
140 out 890,11
150 Out 888,B
160 Out 890,3
170 out 890,11
180 Out 888,C
190 Out 890,15
200 out 890,11
220 GOTO 50But I have entered this program several times and it never works, can someone help me figure out what is wrong?
The schematic of the ADC is as follows:
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Please note that I didn't wright the code or design the schematic the original website is http://www.simprojects.nl/index.htm
Last edited: