Diff: main.cpp

Revision:

0:cf0fbe1e01d4

Child:

1:d5f22105a691

diff -r 000000000000 -r cf0fbe1e01d4 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Nov 28 09:45:23 2017 +0000
@@ -0,0 +1,34 @@
+#include "mbed.h"
+
+// Global variables
+Serial pc(USBTX, USBRX);
+AnalogIn Ain(A3);
+Timer timer1;
+
+float IrSensor;
+// Prototype
+float distance(float);
+
+// main function
+int main(void)
+{
+    pc.printf("Debut du programme...\n");
+    
+    while(1) {
+        IrSensor=Ain.read();        // IrSensor belongs to [0.0; 1.0]
+        pc.printf("%f \n\r",IrSensor*3.3);  // Output voltage from 0 to 3.3V
+        
+        pc.printf("Distance en cm : %.1f \n\r",distance(IrSensor*3.3));        
+        wait (0.5);
+    }
+}
+
+// Calcul de la distance 
+// Entre 20 et 80cm, on peut approximer la distance avec r=24/(V-0,1)
+// r = distance en cm
+// V = tension lue
+float distance(float tension)
+{
+    return(24.0/(tension - 0.1));
+}
+