Diff: main.cpp

Revision:

0:00bd403e0742

Child:

1:fbdfdb9ecbd2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Oct 29 16:23:43 2020 +0000
@@ -0,0 +1,57 @@
+
+//Theremin style demo using HC-SR04 Sonar and a speaker
+// moving a hand away/towards sonar changes audio frequency
+#include "mbed.h"
+#include "ultrasonic.h"
+#include "DRV2605.h"
+ 
+DigitalOut audio(p26); //output to speaker amp or audio jack
+DigitalOut led(LED1); 
+DigitalOut led2(LED2);
+DRV2605 haptics(p9, p10);
+ 
+Timeout cycle;
+ 
+volatile int half_cycle_time = 1;
+ 
+//two calls to this interrupt routine generates a square wave
+void toggle_interrupt()
+{
+    if (half_cycle_time>22000) haptics.play_waveform(0);
+    else {
+        static int e1 = 1;
+        haptics.play_waveform(e1);
+            e1+=10; 
+            if(e1 > 121) e1 = 1;
+        }
+    led = !led;
+    
+    cycle.detach();
+    //update time for interrupt activation -change frequency of square wave
+    cycle.attach_us(&toggle_interrupt, half_cycle_time);
+}
+void newdist(int distance)
+{
+    //update frequency based on new sonar data
+    led2 = !led2;
+    half_cycle_time = distance<<3;
+}
+//HC-SR04 Sonar module
+ ultrasonic mu(p7, p8, .07, 1, &newdist);  
+//Set the trigger pin to p6 and the echo pin to p7
+//have updates every .07 seconds and a timeout after 1
+//second, and call newdist when the distance changes
+ 
+int main()
+{
+    audio = 0;
+    led = 0;
+    cycle.attach(&toggle_interrupt, half_cycle_time);
+    mu.startUpdates();//start measuring the distance with the sonar
+    while(1) {
+        //Do something else here
+        mu.checkDistance();     
+        //call checkDistance() as much as possible, as this is where
+        //the class checks if dist needs to be called.
+    }
+}
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