Diff: main.cpp

Revision:

0:0651c91d96ca

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Jul 31 13:05:58 2020 +0000
@@ -0,0 +1,28 @@
+#include "mbed.h"   
+
+DigitalIn fire(p14); 
+PwmOut spkr(p26); 
+AnalogIn pot1(p19); 
+
+float freqmin = 2000.0;                                     // initialising the low frequency range
+float freqmax = 10000.0;                                    // initialising the high frequency range
+float freqchange = 100;                                     // initialising the frequency change per tone
+float freqperiod = 1.0;                                     // initialising the output tone
+float speakervol = 0.5;                                     // initialising the PWM output
+float tonelength = 0.3;                                     // initialising the time each tone will hold
+
+int main() 
+{   
+    while (1) {         
+        for (float i=freqmin; i<freqmax; i+=freqchange) {             
+            spkr.period(freqperiod/i);                      // PWM output frequency   
+            spkr=speakervol;                                // output volume
+            wait(tonelength);                               // length of each tone
+        }         
+        spkr=0.0;     
+        freqperiod += 1.0;                                  // tone sound will deepen with each repetition
+        tonelength -= 0.05;                                 // tone sound will shorten with each repetition
+
+        while(pot1.read() < 0.5) {} // this uses the pot to control the program     
+    }
+}
\ No newline at end of file