Revision 0:eb243c2ffbfe, committed 2015-01-22

Comitter:

tbjazic

Date:

Thu Jan 22 13:37:43 2015 +0000

Commit message:

Initial commit.

Changed in this revision

diff -r 000000000000 -r eb243c2ffbfe Heater.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Heater.cpp	Thu Jan 22 13:37:43 2015 +0000
@@ -0,0 +1,41 @@
+#include "Heater.h"
+
+Heater::Heater(PinName sensorPin, PinName pwmoutPin): sensor(sensorPin), driver(pwmoutPin) {
+    hysteresis = 0.5;
+    heaterOn = false;
+    configureSensor(5, 30);
+    setTemperature(22);
+    ticker.attach(this, &Heater::regulateTemperature, 1);
+}
+
+void Heater::configureSensor(float minTemperature, float maxTemperature) {
+    if (minTemperature < maxTemperature) {
+        minTemp = minTemperature;
+        maxTemp = maxTemperature;
+    }
+}
+
+float Heater::readTemperature() {
+    return (maxTemp - minTemp) * sensor.read() + minTemp;
+}
+
+bool Heater::isHeaterOn() {
+    return heaterOn;
+}
+
+void Heater::setTemperature(float temp) {
+    if (temp >= minTemp && temp <= maxTemp) {
+        desiredTemp = temp;
+        heaterOnTemp = desiredTemp - hysteresis / 2;
+        heaterOffTemp = desiredTemp + hysteresis / 2;
+    }
+}
+
+void Heater::regulateTemperature() {
+    currentTemp = readTemperature();
+    if (currentTemp < heaterOnTemp && !isHeaterOn())
+        driver = 1; // turn ON the heater
+    else if (currentTemp > heaterOffTemp && isHeaterOn()) 
+        driver = 0; // turn OFF the heater
+    heaterOn = driver.read();
+}
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diff -r 000000000000 -r eb243c2ffbfe Heater.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Heater.h	Thu Jan 22 13:37:43 2015 +0000
@@ -0,0 +1,34 @@
+#ifndef HEATER_H
+#define HEATER_H
+
+#include "mbed.h"
+
+/** A simple class for temperature control in the room using
+ * a heater driven via digital output and one analog temperature sensor.
+ *
+ * Author(s): TVZ Mechatronics Team
+ *
+ */
+class Heater {
+    public:
+        /** Constructor receives pin names of the temperature sensor and
+         * the DigitalOut pin to which the heater driver is connected. */
+        Heater(PinName sensorPin, PinName digitalOutPin);
+        /** Set the temperature range of the sensor. */
+        void configureSensor(float minTemperature, float maxTemperature);
+        /** Read the current room temperature from the sensor. */
+        float readTemperature();
+        /** Test if the heater in turned ON. */
+        bool isHeaterOn();
+        /** Set the desired room temperature. */
+        void setTemperature(float temp);
+    private:
+        AnalogIn sensor;
+        DigitalOut driver;
+        Ticker ticker;
+        void regulateTemperature();
+        bool heaterOn;
+        float currentTemp, desiredTemp, minTemp, maxTemp, hysteresis, heaterOnTemp, heaterOffTemp;
+};
+
+#endif // HEATER_H
\ No newline at end of file