Diff: main.cpp

Revision:

0:e300738b9507

Child:

1:f5b12280ea8a

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Sep 24 14:50:29 2013 +0000
@@ -0,0 +1,34 @@
+#include "mbed.h"
+
+// myled is an object of class PwmOut. It uses the LED_RED pin
+// in human speech: myled is an output that can be controlled with PWM. LED_RED is the pin which is connected to the output
+PwmOut myled(LED_RED);
+
+// pot is an object of class AnalogIn. It uses the PTB0 pin
+// in human speech: pot is an analog input. You can read the voltage on pin PTB0
+AnalogIn pot(PTB0);
+
+
+//start 'main' function. Should be done once in every C(++) program
+int main()
+{
+    //setup some stuff
+    //period of PWM signal is 10kHz. Every 100 microsecond a new PWM period is started
+    myled.period_ms(0.1);
+    //while 1 is unequal to zero. For humans: loop forever
+    while(1) {
+        //Complicated stuff: 
+        //   pot.read() read the value of pot; this gives a value between 0 and 1 depending on the voltage on pin PTB0
+        //   this value is then put in myled.write()
+        //      myled.write(x) -> write value x (between 0 and 1) to PwmOut myled. The duty cycle goes from 0% to 100%.
+        //Warning: Because the LED is full on when the output is completely low (0% duty cycle), the led is full on when the potmeter value is zero.
+        
+        //The code below could also be written as:
+        //myled = pot; 
+        myled.write(pot.read());
+        //wait some time to give the LED output a few PWM cycles. Otherwise a new value is written before the previously set PWM period (of 100microseconds) is finished
+        //This loop executes at roughly 100Hz (1/0.01s)
+        wait(0.01);
+    }
+}
+