I am trying to interface at sensor with a pc. I already know about USB, but was wondering if it is possible to interfacing with a microphone port. If so, does anyone know any good websites that provide infomation on this subject,
Yes, sorry, how silly of me not giving you the detail, i hwas in a hurry that day
Anyway, I have building a pulse rate device, basically I have a pressure sensor which varries between 0.25V and 4.5V depending on the pressure. Rather than using USB (as im on a budget) I thought about using the line in, firstly as it can be cheaper and secondly I could bypass the A/D convertions,
hope this help makes things clearer on what I trying to do
Once more I missed at least one message. Seems my ISP cannot handle al the news even while running at least two news servers.
Anyway, I don't understand the "pulse rate" device. A pressure sensor giving
0.25-4.5V over its pressure range makes sense. But that means a relative slowly changing DC signal, which for sure will not be seen by the microphone input. Besides, a microphone tends to act on millivolts. Even the 0.25V will be too high for it.
If you want to learn more about PC-port interfacing have a look at:
FAIK this site does not mention the gameport interface. This interface can be used to measure voltages from about 4V upward. Described - amongst others - in some Elektor books.