Tomo Yamanaka / Mbed 2 deprecated Distance_Sensor_Sample

GP2Y0A21YK Distance Sensor sample.

Dependencies:   mbed

About GP2Y0A21YK

GP2Y0A21YK is a distance sensor and can be controlled by using the AnalogIn.
The range of this sensor is 10-80cm.

About sample program

This program outputs distance between the object to the terminal.
Please use in the range of 10-80cm because of the sensor specifications.
Even if the distance is less than 10cm, this program outputs the distance to the terminal.
However, since the output value is not a correct value, note the malfunction.

About wiring

SensorGR-PEACH
White wireA0
Orange wireGND
Black wire3.0V

Files at this revision

API Documentation at this revision

Revision 1:da6118c4da1f, committed 2016-04-20

Comitter:
1050186
Date:
Wed Apr 20 04:19:13 2016 +0000
Parent:
0:f8c34fd5e223
Commit message:
Modify main.cpp

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Tue Apr 19 10:00:38 2016 +0000
+++ b/main.cpp	Wed Apr 20 04:19:13 2016 +0000
@@ -2,27 +2,38 @@
 
 AnalogIn ain(A0);
 DigitalOut led1(LED_RED);
-DigitalOut led2(LED_GREEN);
-DigitalOut led3(LED_BLUE);
-DigitalOut led4(LED_USER);
+Ticker flipper;
+int f_sen = 0;
 
-int main() {
+void flip() {
     float tmp1 = 0;
     float tmp2 = 0;
     float data;
+    float distance;
+
+    tmp1 = ain;
+    tmp2 = ain;
+    data = (tmp1 + tmp2) / 2.0f;
+
+    if ((0.121 <= data) && (data <= 0.970)) {
+        distance = 26.663 * pow((data * 3.3),-1.25);
+        printf("Distance : %4.3f[cm]\n",distance);
+        f_sen = 1;
+    } else {
+        printf("Distance : ------[cm]\n");
+        f_sen = 0;
+    }
+}
+
+int main() {
 
     printf("Sensor start!\n");
+    flipper.attach_us(&flip, 500000);//500ms 
     while(1) {
-        tmp1 = ain;
-        tmp2 = ain;
-        data = (tmp1 + tmp2) / 2.0f;
-
-        data = ain.read();
-        if ((0.121 <= data) && (data <= 0.970)) {
-            float range = 26.663 * pow((data * 3.3),-1.25);
-            printf("Distance : %4.2f[cm]\n",range) ;
+        if(f_sen == 1){
+            led1 = 1;
         } else {
-            printf("Distance : -----[cm]\n");
+            led1 = 0;
         }
         wait(0.5);
     }