Revision 0:b4a6f6bcab30, committed 2021-10-31

Comitter:

snapo

Date:

Sun Oct 31 10:46:33 2021 +0000

Commit message:

basic class for use of the HC-SR04 ultrasound sensor

Changed in this revision

diff -r 000000000000 -r b4a6f6bcab30 HC-SR04.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HC-SR04.cpp	Sun Oct 31 10:46:33 2021 +0000
@@ -0,0 +1,52 @@
+#include "HC-SR04.h"
+
+
+
+HCSR04::HCSR04 (PinName echo, PinName trigger):
+    echo_(echo), trigger_(trigger, PIN_OUTPUT, OpenDrain, 0){};
+    
+void HCSR04::reading(){
+    t_.reset();
+    
+    trigger_ = true;
+    wait_us(10);
+    trigger_ = false;
+         
+    //waits for the echo pin to activate then starts to measure time
+    while(!echo_);
+    t_.start();
+    while(echo_);
+    //time stops being measured once echo is deactivated.
+    t_.stop();
+    //time measured in microseconds to increase the accuracy then the distance is scaled up into mm.
+    time_us_ = duration_cast<std::chrono::microseconds>(t_.elapsed_time()).count();
+    //distance stored in baseDistance_ variable
+    distance_ = (160*time_us_) / 1000;
+    thread_sleep_for(1000);
+}
+
+void HCSR04::fastTimeReading(){
+    t_.reset();
+    
+    trigger_ = true;
+    wait_us(10);
+    trigger_ = false;
+         
+    //waits for the echo pin to activate then starts to measure time
+    while(!echo_);
+    t_.start();
+    while(echo_);
+    //time stops being measured once echo is deactivated.
+    t_.stop();
+    time_us_ = duration_cast<std::chrono::microseconds>(t_.elapsed_time()).count();
+    
+}
+
+int HCSR04::getTime(){
+    return time_us_;
+}
+
+int HCSR04::getDistance(){
+    return distance_;
+}
+

diff -r 000000000000 -r b4a6f6bcab30 HC-SR04.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HC-SR04.h	Sun Oct 31 10:46:33 2021 +0000
@@ -0,0 +1,24 @@
+#pragma once
+#include "mbed.h"
+
+
+class HCSR04 {
+   DigitalIn echo_ ;
+   DigitalInOut trigger_; 
+   
+   Timer t_;
+   int time_us_;
+   int distance_;
+    
+    
+public:
+
+    HCSR04(PinName echo, PinName trigger);
+    
+    void reading();
+    void fastTimeReading();
+    
+    int getTime();
+    int getDistance();
+    
+};
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