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comparison projects/basic_analog_input/render.cpp @ 285:5433c83ce04e Doxy prerelease

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Doxygen content added to more project render.cpp files and amended in others.
author Robert Jack <robert.h.jack@gmail.com>
date Tue, 17 May 2016 18:46:55 +0100
parents ac8eb07afcf5
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284:7bfb25a2e158 285:5433c83ce04e
23 This sketch produces a sine tone, the frequency and amplitude of which are 23 This sketch produces a sine tone, the frequency and amplitude of which are
24 affected by data received on the analog pins. Before looping through each audio 24 affected by data received on the analog pins. Before looping through each audio
25 frame, we declare a value for the frequency and amplitude of our sine tone 25 frame, we declare a value for the frequency and amplitude of our sine tone
26 (line 55); we adjust these values by taking in data from analog sensors 26 (line 55); we adjust these values by taking in data from analog sensors
27 (for example, a potentiometer). 27 (for example, a potentiometer).
28
29 - connect a 10K pot to 3.3V and GND on its 1st and 3rd pins.
30 - connect the 2nd middle pin of the pot to analogIn 0.
31 - connect another 10K pot in the same way but with the middle pin connected to analogIn 1.
28 32
29 The important thing to notice is that audio is sampled twice as often as analog 33 The important thing to notice is that audio is sampled twice as often as analog
30 data. The audio sampling rate is 44.1kHz (44100 frames per second) and the 34 data. The audio sampling rate is 44.1kHz (44100 frames per second) and the
31 analog sampling rate is 22.05kHz (22050 frames per second). On line 62 you might 35 analog sampling rate is 22.05kHz (22050 frames per second). On line 62 you might
32 notice that we are processing the analog data and updating frequency and 36 notice that we are processing the analog data and updating frequency and