TVZ Mechatronics Team

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Room temperature control

Implement a class named Heater in a Heater.cpp file, with the following declaration part:

Heater.h

#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 PwmOut pin to which the heater driver is connected. */
        Heater(PinName sensorPin, PinName pwmoutPin);
        /** Set the temperature range of the sensor. */
        void configureSensor(float minTemperature, float maxTemperature);
        /** Read the current room temperature from the sensor. */
        float readTemperature();
        /** Get the current room temperature (do not read from sensor again). */
        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

Then write the main function main.cpp for mbed application board, in which the potentiometer Pot1 acts as a temperature sensor, Pot2 acts as a thermostat (sets a desired temperature) and LED1 indicates the heater state (ON or OFF). Display the data on the LCD screen, according to the following example:

Desired temperature: 22.5
Current temperature: 24.0
Heater state: OFF
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