Victor Szultka
Simulated fire alarm response, with increasing tempo and lowering tone on each repetition
Revision 0:0651c91d96ca, committed 2020-07-31
- Comitter:
- saltire78
- Date:
- Fri Jul 31 13:05:58 2020 +0000
- Commit message:
- online posting
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /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
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Jul 31 13:05:58 2020 +0000 @@ -0,0 +1,1 @@ +https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400 \ No newline at end of file