Infrared sensor

Robot Freak

I've found a infrared example on the Yahoo group, but it also sends infrared with an transmitter.
I don't need that, because i'm using an infraredball, but I can't find the correct things to delete...
Isn't there a simple way like CPU.readport() or something?

Thanks!

Post Edited (Robot Freak) : 12/11/2006 7:57:14 PM GMT

Robot Freak

Nothing?
I'm using the IR receiver from parallax:
www.parallax.com/detail.asp?product_id=350-00014

Post Edited (Robot Freak) : 12/13/2006 8:46:27 PM GMT

Peter Verkaik

According to the docs at your link, the IR detector outputs
a low signal when it detects a 40kHz infrared signal.
So you can use CPU.readPin() to test wether you get
a low or high signal.
To decode a pulsetrain requires more info.
What program did you find at the yahoo group?
Please attach it to your post.

regards peter

Robot Freak

In the zip folder JBot i've got the following examples:
IrRangeSensorTest1
IrRangeTest1

And packages:
IrRangeDropOffSensor
IrRangeSensor
IrRangeSensorTask

But they all work with a transmitter (I think)

Peter Verkaik

Yes, those programs change a DAC output to change
the intensity of a led and so are able to measure distance.
With an independant light source you cannot measure distance
but you can detect light.
The only statement from those programs that applies to detecting light
is
····· if(!CPU.readPin(detectorPin)) {
······· //light detected
····· }
····· else {
······· //light not detected
····· }

You might want to try using
· int time = CPU.pulseIn(32767,detectorPin,false);
which measures a low going pulse in 8.68usec units

regards peter
·