added 200 us delay after emitter state changes

pololu · Sep 13, 2012 · 4e957e4 · 4e957e4
1 parent 7779adc
commit 4e957e4
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Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/QTRSensors/QTRSensors.cpp b/QTRSensors/QTRSensors.cpp
@@ -123,6 +123,7 @@ void QTRSensors::emittersOff()
 		return;
 	pinMode(_emitterPin, OUTPUT);
 	digitalWrite(_emitterPin, LOW);
+	delayMicroseconds(200);
 }
 
 void QTRSensors::emittersOn()
@@ -131,6 +132,7 @@ void QTRSensors::emittersOn()
 		return;
 	pinMode(_emitterPin, OUTPUT);
 	digitalWrite(_emitterPin, HIGH);
+	delayMicroseconds(200);
 }
 
 // Resets the calibration.

diff --git a/README.textile b/README.textile
@@ -1,7 +1,7 @@
 h1. Arduino library for the Pololu QTR reflectance sensors
 
-Version: 2.0.0
-Release Date: 2012-02-14
+Version: 2.0.1
+Release Date: 2012-09-13
 "www.pololu.com":http://www.pololu.com/
 
 h2. Summary
@@ -12,4 +12,5 @@ For documentation, please see the "user's guide":http://www.pololu.com/docs/0J19
 
 h2. Version History
 
+* 2.0.1 (2012-09-13): Added a 200 us delay after emitter state changes to ensure sensors do not start being sampled before the LEDs turn on/off.
 * 2.0.0 (2012-02-14): Initial release of library on GitHub (with Arduino 1.0 compatibility).