comparison examples/03-Analog/analog-input/render.cpp @ 524:9f455f01edd5 prerelease

Doxygen updates

 - connect the 2nd middle pin of the pot to analogIn 0.
 - connect another 10K pot in the same way but with the middle pin connected to analogIn 1.
 
 The important thing to notice is that audio is sampled twice as often as analog 
 data. The audio sampling rate is 44.1kHz (44100 frames per second) and the 
-analog sampling rate is 22.05kHz (22050 frames per second). On line 62 you might 
-notice that we are processing the analog data and updating frequency and 
-amplitude only on every second audio sample, since the analog sampling rate is 
-half that of the audio.
+analog sampling rate is 22.05kHz (22050 frames per second). Notice that we are 
+processing the analog data and updating frequency and amplitude only on every 
+second audio sample, since the analog sampling rate is half that of the audio.
+
+````
+if(!(n % gAudioFramesPerAnalogFrame)) {
+    // Even audio samples: update frequency and amplitude from the matrix
+    frequency = map(analogRead(context, n/gAudioFramesPerAnalogFrame, gSensorInputFrequency), 0, 1, 100, 1000);
+    amplitude = analogRead(context, n/gAudioFramesPerAnalogFrame, gSensorInputAmplitude);
+}
+````
 
 Note that the pin numbers are stored in the variables `gAnalogInputFrequency` and 
 `gAnalogInputAmplitude`. These are declared in the main.cpp file; if you look in 
 that file you will see that they have the values of 0 and 1. Bear in mind that 
 these are analog input pins which is a specific header!