Subject:
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Light sensor initialization time?
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Newsgroups:
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lugnet.robotics.rcx.java
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Date:
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Thu, 27 Sep 2001 20:28:19 GMT
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Viewed:
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2577 times
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Hellow!
Here a little fact: the first reading on the light sensor
_just_ after you have activated it is too high. It seems
like one has to wait a little after activating the sensor.
The following program shows it rather nicely:
____START OF CODE____
import josx.platform.rcx.*;
public final class WeirdLight implements SensorConstants {
public static void main( String[] args ) {
Sensor.S2.setTypeAndMode( SENSOR_TYPE_LIGHT,
SENSOR_MODE_PCT );
Sensor.S2.activate();
// Uncomment the following to make it behave as expected
//try { Thread.sleep( 500 ); } catch ( Exception e ) {}
int val = Sensor.S2.readValue();
LCD.showNumber( val );
try { Thread.sleep( 1500 ); } catch ( Exception e ) {}
Sensor.S2.passivate();
} // main
} // WeirdLight
____END OF CODE____
If you include the first sleep command the value is as
expected.
When I ran the program I got the following results: 79-80
_without_ the sleep, and 33-35 (black tape) with the sleep.
Regards,
Martin E. Nielsen
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Message has 1 Reply:
 | | Re: Light sensor initialization time?
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| I suspect this is due to the fact that the first sample from the sensor is actually being obtained while the sensor's reservoir capacitor is still charging. Why don't you try a simple test, actually two tests; 1. Initialise as passive sensor Wait 1 (...) (23 years ago, 27-Sep-01, to lugnet.robotics.rcx.java)
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