Interactive Device Design
ChordJoy is a keyboard application that accepts chordal input from a set of digital ports, outputting letters and the chords that correspond to the piano keyboard keys the user has pressed.
Dependencies: PinDetect_KL25Z mbed-rtos mbed
Revision 0:5ffec551c755, committed 2014-09-18
- Comitter:
- andrewhead
- Date:
- Thu Sep 18 05:48:12 2014 +0000
- Child:
- 1:b6b866a58a87
- Commit message:
- Play all chords on 3 buzzers.
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/PinDetect_KL25Z.lib Thu Sep 18 05:48:12 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/bjo3rn/code/PinDetect_KL25Z/#4f11ae3737c7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Sep 18 05:48:12 2014 +0000
@@ -0,0 +1,88 @@
+#include "mbed.h"
+#include "PinDetect.h"
+#include "rtos.h"
+
+const int BUZZERS = 3;
+const int LETTERS = 27;
+
+Serial pc(USBTX, USBRX);
+PinDetect buttons [3] = {
+ PinDetect(D15),
+ PinDetect(D14),
+ PinDetect(D13)
+};
+
+// Note: there are only THREE PWMs on the board. So this is all we can use
+// for this particular method of sound output.
+PwmOut buzzers [3] = {
+ PwmOut(D0),
+ PwmOut(D2),
+ PwmOut(D3)
+};
+// Periods of notes in microseconds
+int notePeriods [8] = {
+ 3818, // C4
+ 3412, // D4
+ 3030, // E4
+ 2895, // F4
+ 2551, // G4
+ 2273, // A4
+ 2024, // B4
+ 10000000 // inaudible pitch
+};
+int chords [LETTERS][BUZZERS] = {
+ {0, 7, 7}, // single notes
+ {1, 7, 7},
+ {2, 7, 7},
+ {3, 7, 7},
+ {4, 7, 7},
+ {5, 7, 7},
+ {6, 7, 7},
+ {0, 2, 7}, // diads
+ {0, 3, 7},
+ {0, 4, 7},
+ {0, 5, 7},
+ {1, 3, 7},
+ {1, 4, 7},
+ {1, 5, 7},
+ {1, 6, 7},
+ {2, 4, 7},
+ {2, 5, 7},
+ {2, 6, 7},
+ {3, 4, 7},
+ {3, 5, 7},
+ {4, 6, 7},
+ {0, 2, 4}, // triads
+ {0, 2, 5},
+ {0, 3, 5},
+ {1, 4, 6},
+ {1, 3, 4},
+ {1, 3, 6}
+};
+
+void playAllChords(void) {
+ for (int i = 0; i < LETTERS; i++) {
+ int *chord = chords[i];
+ for (int j = 0; j < BUZZERS; j++) {
+ int noteIndex = chord[j];
+ if (noteIndex == 7) {
+ buzzers[j] = 0;
+ }
+ else {
+ buzzers[j] = .5f;
+ int period = notePeriods[noteIndex];
+ buzzers[j].period_us(period);
+ }
+ }
+ wait_ms(1000);
+ }
+}
+
+int main() {
+ // Initialize all duty cycles to off, so we hear nothing.
+ for (int i = 0; i < BUZZERS; i++) {
+ buzzers[i] = 0.0f;
+ }
+ pc.printf("%c\n", 97);
+ // playAllChords();
+}
\ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-rtos.lib Thu Sep 18 05:48:12 2014 +0000 @@ -0,0 +1,1 @@ +https://mbed.org/users/mbed_official/code/mbed-rtos/#631c0f1008c3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Thu Sep 18 05:48:12 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/552587b429a1 \ No newline at end of file
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/pwmout.bld Thu Sep 18 05:48:12 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/552587b429a1 \ No newline at end of file