Hey. I am looking for a more appropriate sensor for my application. I need to detect human hand inside a narrow area. I am currently using IR diffusion sensors panasonic cx-421 and they seem to work fine. However, they are quite expensive and have a very narrow beam.
I have been looking at PIR sensors for a while now, I have only tried this module so far:
and I can say that I do not really like the way it works. It holds the line LOW everytime its being triggered for 2.5seconds. In my application, the sensor needs to capture human hand very fast. A human putting hand inside a detecting area must trigger the sensor immediately and keep it triggered until the hand is removed. Once the hand is removed, the sensor must toggle off immidiately - no delay is accepted. I could not get this sensor to work fast enough.
Anyway, I could not really understand why these PIR sensors require so much additional hardware to function properly? I believe inside this module sits this sensor:
Looking at its datasheet, they suggest an application circuit;
Can I not wire this device directly to voltage supply and read its voltage directly from the output pin?
I have been looking at PIR sensors for a while now, I have only tried this module so far:
and I can say that I do not really like the way it works. It holds the line LOW everytime its being triggered for 2.5seconds. In my application, the sensor needs to capture human hand very fast. A human putting hand inside a detecting area must trigger the sensor immediately and keep it triggered until the hand is removed. Once the hand is removed, the sensor must toggle off immidiately - no delay is accepted. I could not get this sensor to work fast enough.
Anyway, I could not really understand why these PIR sensors require so much additional hardware to function properly? I believe inside this module sits this sensor:
Looking at its datasheet, they suggest an application circuit;
Can I not wire this device directly to voltage supply and read its voltage directly from the output pin?