Diff: main.cpp

Revision:

0:708a1d284406

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jan 19 19:46:05 2011 +0000
@@ -0,0 +1,38 @@
+#include "mbed.h"
+
+#include "math.h"
+
+/*
+    read the light value from a photo transistor connected to P20 and
+    drive a LCDs LED backlight connected to P25.
+    The backlight should dimm in the dark and brighten up when the lights go on.
+    
+    NOTE: the version below doesn't work, remove the printf in line 35!
+*/
+int main() {
+    DigitalOut led1(LED1);
+    float f=0.0;
+    PwmOut display(p25);
+    display.period_ms(1);
+    display=f;
+    
+    AnalogIn light(p20);
+   
+    for (int i=0;i<100;i++)
+    {
+        f=f+0.01;
+        display=f;
+        wait (0.03);
+    }
+    printf("%f\n",display.read());
+    led1=1;
+        
+    while (true)
+    {
+        double d=light;
+        double sq=pow(d,0.6);
+        display.write(sq*3);
+        printf("%f / %f\n",d,sq);
+        wait(1);
+    }
+}