brown.austen

I'm working on my first Max/MSP project for a sound art installation, and so far everything is going great. For one portion of the patch, I would like to have PIR sensors dictate the frequency of some recordings, but I'm not getting any variable numbers from the sensor. Does any one know if the PIR sensors are able to output variable data, or just high and low?

pir-sensor

Have you tried turning it off and on again?

Most PIR sensors are wired up as logical motion detectors (on/off) for ease of use. Think of those porch lights that turn on automatically when people walk by. I think it's possible to get analog data from a PIR, but it would probably require quite a bit of op-amp fiddling to get something usable. AFAIK, there is no easy out-of-the-box PIR analog sensor that gives usable voltages(although the PIR itself is an analog sensor).

You might be happier with an infrared ranger, an ultrasonic ranger, or camera detection.

Most PIR sensors are wired up as logical motion detectors (on/off) for ease of use.  Think of those porch lights that turn on automatically when people walk by.  I think it's possible to get analog data from a PIR, but it would probably require quite a bit of op-amp fiddling to get something usable.  AFAIK, there is no easy out-of-the-box PIR analog sensor that gives usable voltages(although the PIR itself is an analog sensor).
You might be happier with an infrared ranger, an ultrasonic ranger, or camera detection.


That's what I was afraid of, but thanks for the input. I think radio shack is getting tired of my returns...

Andrew's right, PIR's are best used as a switch. Oddly, the straight analog sensor is expensive:

http://www.acroname.com/robotics/parts/R3-PYRO1.html

I've used it, and you can get a general idea of direction of motion, sometimes, but it is very twitchy. It's more accurate, but less sensitive, without the lens. There's a great information resource here:

http://www.ladyada.net/learn/sensors/pir.html

Andrew's right, PIR's are best used as a switch.  Oddly, the straight analog sensor is expensive:

I've used it, and you can get a general idea of direction of motion, sometimes, but it is very twitchy.  It's more accurate, but less sensitive, without the lens.  There's a great information resource here:

http://www.ladyada.net/learn/sensors/pir.html


http://arduino.cc/en/Tutorial/UltrasoundSensor

perhaps
http://arduino.cc/en/Tutorial/UltrasoundSensor


Thanks for the input everybody! I returned the PIR sensors and picked up a sonar, too bad the sonar isn't 10 bucks.

Hello there. I am working on an art installation project and the main idea is to get data from the distance of the people around a UltrasoundSensor and generate some visuals and some audio samples with this data. @Brendan you got it right. Thanks for the link.

A sensor that uses the physical properties of infrared to make measurements. Infrared is also called infrared light, which has properties such as reflection, refraction, scattering, interference, and absorption. Any substance, as long as it has a certain temperature (above absolute zero), can radiate infrared rays. The infrared sensor ( 

 ) does not directly contact the measured object during measurement, so there is no friction, and it has the advantages of high sensitivity and fast response.

A sensor that uses the physical properties of infrared to make measurements. Infrared is also called infrared light, which has properties such as reflection, refraction, scattering, interference, and absorption. Any substance, as long as it has a certain temperature (above absolute zero), can radiate infrared rays. The infrared sensor ( ISL29033IROZ-T7 ) does not directly contact the measured object during measurement, so there is no friction, and it has the advantages of high sensitivity and fast response.

PIR Sensor