Diff: main.cpp

Revision:

0:753612ff63ad

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Sep 18 16:35:45 2011 +0000
@@ -0,0 +1,32 @@
+#include "mbed.h"
+
+/**
+    This source code is used to connect a MaxSonar detector. It is written to allow multiple sonar's. 
+    If you want the sonar to constantly poll constantly either: don't attach the pin, or delete the code relating to 'Enable'
+    
+    This code is public domain.
+**/
+
+AnalogIn Sensor(p20);   //Analog port that is connected to the MaxSonar range detector
+DigitalOut Enable(p18); //Remove this if you want a constant poll
+DigitalOut led(LED1);   //led, useful to see when the sonar is polling
+Serial serialPort(USBTX, USBRX);    //To talk back to your computer
+
+int main() {
+    float adc, volts, in;
+    
+    while (1) {        
+        Enable = 1; //Enable the sonar
+        led = 1;    //Turn the LED on to show let the user know its working
+        wait_us(25);//Wait 20uS + 5uS safety margin
+        adc = Sensor.read();    //Read the sensor value
+        Enable = 0; //Disable the sonar
+        led = 0;    //Turn the LED off
+        volts = ( adc * 3.3 );          // convert to volts
+        in = volts / 0.0032 * 0.3937;    // 3.3V supply: 3.2mV per cm * CM -> IN conversion factor
+        
+        serialPort.printf("%8.5f adc %8.5fV %8.2f\"\n", adc, volts, in);
+
+        wait(0.5);
+    }
+}