Y
yoavshe
- Jan 1, 1970
- 0
Hi,
I've been trying to read a signal by a parallel port.
The signal is the output of a comparator LM339, by a 21k resistor
connected to 30V, and then 10k connected to ground.
The problem is - whenever I connect the parallel port - the signal dies
(0V read).
What am i doing wrong?
What should I check?
Can anyone refer me to an example circuit where data is read by a
parallel port?
Thanks!
I've been trying to read a signal by a parallel port.
The signal is the output of a comparator LM339, by a 21k resistor
connected to 30V, and then 10k connected to ground.
The problem is - whenever I connect the parallel port - the signal dies
(0V read).
What am i doing wrong?
What should I check?
Can anyone refer me to an example circuit where data is read by a
parallel port?
Thanks!