Revision 0:548da052d6e4, committed 2016-03-24

Comitter:

jupark

Date:

Thu Mar 24 01:11:51 2016 +0000

Commit message:

part2;

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/C12832_lcd.lib	Thu Mar 24 01:11:51 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/dreschpe/code/C12832_lcd/#8f86576007d6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Mar 24 01:11:51 2016 +0000
@@ -0,0 +1,53 @@
+/**********************************************
+MIDN Justin Park and Drew Moore
+10 March 2016
+SY202 Lab 8 Part 2
+Description: This function calculates the time
+                a single pulse takes and converts
+                the time into distance in an 
+                Ultrasonic sensor.
+*********************************************/
+#include "mbed.h"
+#include "C12832_lcd.h"
+
+//Initialize the LCD display
+C12832_LCD lcd;
+
+InterruptIn pw_event(p21); // Declare a pulse width object
+Timer t; // Declare a timer object
+
+//Initialize float variables
+float distance; // Variable to store distance from the sensor
+float us = 0; // Variable to store microseconds
+
+// Function to store the time measured from the timer
+void getPw(){
+   us = t.read_us();
+    }
+
+// Function to reset and start the timer
+void rise_int(){
+    t.reset();
+    t.start();
+    }
+
+int main() {
+    while(1) {
+        
+        // Obtain the microseconds it takes for the pulse
+        // to achieve its rise and fall time
+        pw_event.rise(&rise_int);
+        pw_event.fall(&getPw);
+        
+        // Formula based on calibration calculated from the 
+        // excel spreadsheet
+        distance = 0.0066 * us + 0.9024;
+        
+        // Print distance to the LCD display
+        lcd.locate(0,0);
+        lcd.printf("%f", distance);
+        
+    }
+}
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Mar 24 01:11:51 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/87f2f5183dfb
\ No newline at end of file