Michael Shimniok
A sorta-kinda Theremin using two Sharp IR rangers, my A2D I2C adapters, and my simple pwm/sound/beep library. Demo video: http://www.youtube.com/watch?v=6HEsA3RBoPc
Revision 0:08f8dd6fd2e9, committed 2013-07-31
- Comitter:
- shimniok
- Date:
- Wed Jul 31 23:08:05 2013 +0000
- Commit message:
- Working revision, updated documentation with youtube video
Changed in this revision
diff -r 000000000000 -r 08f8dd6fd2e9 Beep.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Beep.lib Wed Jul 31 23:08:05 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/shimniok/code/Beep/#3eb39e374fc3
diff -r 000000000000 -r 08f8dd6fd2e9 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Jul 31 23:08:05 2013 +0000
@@ -0,0 +1,64 @@
+#include "mbed.h"
+#include "Beep.h"
+
+/**
+ * Pseudo Theremin using Sharp IR Rangers + my A2D I2C adapters
+ *
+ * Demo Video: http://www.youtube.com/watch?v=6HEsA3RBoPc
+ * A2D adapters: https://code.google.com/p/bot-thoughts-sharpi2c/
+ *
+ * One ranger controls pitch, the other on/off.
+ * Simple PWM sound generation is used. The output pin p22 feeds
+ * into a simple common-emitter BJT amplifier on my breadboard.
+ */
+DigitalOut myled(LED1);
+I2C i2c(p28, p27); // sda, scl
+Serial pc(USBTX, USBRX); // tx, rx
+Timer t;
+Beep buzzer(p22);
+
+#define PITCH 0x26
+#define PITCHR (PITCH<<1)|1
+#define PITCHW (PITCH<<1)
+#define VOLUME 0x27
+
+int main() {
+ int p = 0;
+ int v = 0;
+
+ i2c.frequency(100000);
+ pc.baud(115200);
+ pc.printf("Hello world!\n");
+ t.start();
+ t.reset();
+
+ while(1) {
+ char data[3];
+ float range = 0.0;
+
+ pc.printf("%8u ", t.read_ms());
+
+ if ( i2c.read(VOLUME<<1, data, 2) != 0) {
+ pc.printf("~0x%02x ", VOLUME);
+ } else {
+ v = data[0]<<8 | data[1];
+ pc.printf("%03u %03u v=%u ", data[0], data[1], v);
+ }
+
+ if ( i2c.read(PITCHR, data, 2) != 0) {
+ pc.printf("~0x%02x", PITCH);
+ } else {
+ p = data[0]<<8 | data[1];
+ if (v > 2300){
+ range = 500 + 500 * powf(4187.8 / p, 1.1060);
+ buzzer.beep(int(range));
+ } else {
+ buzzer.nobeep();
+ }
+ pc.printf("%03u %03u p=%u r=%f", data[0], data[1], p, range);
+ }
+ pc.printf("\n");
+
+ wait(0.005);
+ }
+}
diff -r 000000000000 -r 08f8dd6fd2e9 mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Wed Jul 31 23:08:05 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/b3110cd2dd17 \ No newline at end of file