Diff: Solenoid.h

Revision:

0:bd163b4ce456

Child:

1:b87c9e1546c5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Solenoid.h	Tue Nov 24 09:36:27 2015 +0000
@@ -0,0 +1,51 @@
+//Found on Jim Hamblen's Solenoid Notebook page at https://developer.mbed.org/users/4180_1/notebook/an-introduction-to-solenoids/
+
+#ifndef __SOLENOID_H__
+#define __SOLENOID_H__
+
+#include "mbed.h"
+
+class Solenoid
+{
+public:
+    Solenoid (PinName pin, float ondelay=0.5, float offdelay=2.0);
+    void write(bool state);
+    Solenoid& operator= (bool value);
+ 
+private:
+    void Solenoid_Off_Int();
+    DigitalOut _pin;
+    Timeout tint;
+    Timer offtimer;
+    float ontime;
+    float offtime;
+};
+Solenoid::Solenoid(PinName pin, float ondelay, float offdelay) : _pin(pin), ontime(ondelay), offtime(offdelay)
+{
+    _pin=0;
+    offtimer.start();
+ 
+}
+void Solenoid::Solenoid_Off_Int()
+{
+    _pin=0;//OFF timer interrupt routine to auto turn off solenoid
+    offtimer.start(); //start off-time delay count
+}
+void Solenoid::write(bool value)
+{
+    if (value!=0) {//ON so do auto off with timer interrupt
+        while(offtimer.read() < offtime); //wait for min OFF time before next ON allowed
+        offtimer.stop();
+        offtimer.reset(); //reset off timer delay count
+        tint.attach(this,&Solenoid::Solenoid_Off_Int,ontime);//setup a timer interrupt for on time
+    } else
+        offtimer.start(); //solenoid turned off with a write call (not timers) so start off count
+    _pin = value;
+}
+Solenoid& Solenoid::operator= (bool value)
+{
+    write(value);
+    return *this;
+}
+
+#endif /* __SOLENOID_H__ */
\ No newline at end of file