Revision 0:64a47a66c95d, committed 2014-10-05

Comitter:

jmar11

Date:

Sun Oct 05 02:10:38 2014 +0000

Commit message:

This code sets a threshold and reads all the sensors

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/line_sensors_to_serial.cpp	Sun Oct 05 02:10:38 2014 +0000
@@ -0,0 +1,77 @@
+/*This piece of code sets a threshold and reads all the sensors
+**sample output:
+**
+**Please put all the sensors over white and press <enter>
+**
+**The values of the line sensors are below
+**0 == white  1 == black
+**
+**1 2 3 4 5 6 7 8
+**0 0 0 1 1 0 0 0
+*/
+
+#include "mbed.h"
+
+Serial pc(USBTX, USBRX);
+Timer timer;
+DigitalInOut sens[8] = {PTB8, PTB9, PTB10, PTB11, PTE2, PTE3, PTE4, PTE5};    //freedom board pins
+int detect[8];
+
+void readLine(int);
+int setThresh(int);
+
+int main() {
+    int thresh;
+    int timeOut = 0x7FFFFFFF;
+     
+    pc.printf("Please put all the sensors over white and press <enter>\n\n\r");
+    pc.getc();
+    
+    thresh = setThresh(timeOut);
+    
+    timeOut = 2 * thresh;
+    
+    pc.printf("The values of the line sensors are below\n\r0 == white  1 == black\n\n\r");
+    pc.printf("1 2 3 4 5 6 7 8\n\r");
+    
+    while(1){
+        readLine(timeOut);
+        
+        for(int i = 0; i < 8; i++){
+            if(detect[i] > thresh)
+                detect[i] = 1;
+            else
+                detect[i] = 0;
+            
+            pc.printf("%u ", detect[i]);
+        }
+        pc.printf("\r");
+        wait_ms(50);
+    }
+}
+
+void readLine(int timeOut){    
+    for(int i = 0; i < 8; i++){
+        sens[i].output(); 
+        sens[i] = 1;
+        wait_us(15);
+        sens[i] = 0;
+        sens[i].input();
+        timer.start();
+        while(sens[i] == 1 && timer.read_us() < timeOut){
+        }
+        timer.stop();
+        detect[i] = timer.read_us();
+        timer.reset();
+    }
+}
+
+int setThresh(int timeOut){
+    long int temp = 0;
+    
+    readLine(timeOut);
+    for(int i = 0; i < 8; i++){
+        temp += detect[i];
+    }
+    return 9 * (temp / 8.0);
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sun Oct 05 02:10:38 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/552587b429a1
\ No newline at end of file