Diff: TemperaturePlot.h

Revision:

0:da2b8c7a1ec1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TemperaturePlot.h	Mon May 11 15:25:52 2015 +0000
@@ -0,0 +1,185 @@
+/**
+@file temperatureplot.h
+*/
+#ifndef TEMPERATUREPLOT_H
+#define TEMPERATUREPLOT_H
+
+/**
+@brief displays the temperature against time at various intervals
+@brief temperature is in degrees celsius
+@author Augustine K Kizito
+@data April 2015
+*/
+
+
+
+
+class TemperaturePlot
+{
+private:
+    bool changeScreen; // tracks if the user pressed a button that changes the screen
+    int nextScreen; // tracks whether the user wants to go to
+    //the previous screen or next screen
+    int xCord; // tracks the x coordinate
+    char tempString[32]; // temperature value as string
+    bool pause; // tracks if the plotting has been paused
+    int pInterval; // determines the intervals at which data is plotted
+    Ticker timer; // plots data at particular intervals
+
+    void onBack(); // user pressed the back button
+    void onEnter(); // user pressed the on enter button
+    void plotData(); // plot temperature data
+    void clearPlot(); // clear the plotted data
+    void pausePlot(); // it pauses plotting of data so that the user can see it
+
+public:
+    /**
+    Manages the execution of the Temperature Plot Screen 
+    
+    @param - integer interval, the intervals after which temperature is plotted against time on the LCD screen
+    @returns
+     -1   - navigate to previous screen
+    
+    */
+    int start(int interval);
+
+};
+
+int TemperaturePlot::start(int interval)
+{
+    // Initialisations
+    pInterval = interval;
+    xCord = 0; // set the x cordinate to 0
+    pause = false;
+
+    backButton.mode(PullDown); // activate pullDown Resistor
+    enterButton.mode(PullDown); // activate pullDown Resistor
+    
+    backButton.rise(this,&TemperaturePlot::onBack); // call onBack when the back button is pressed
+    enterButton.rise(this,&TemperaturePlot::onEnter); // call onBack when the back button is pressed
+
+    plotData(); //plot data onto the screen
+    lcd.printString("Deg Cel", 40,1);
+
+   // plot data on LCD screen depending on the interval previously selected by the user
+    if ( interval == 0) {
+        timer.attach(this, &TemperaturePlot::plotData,0.1); // call ISR every 1.0 second
+    } else if ( interval == 1) {
+        timer.attach(this, &TemperaturePlot::plotData,0.5); // call ISR every 5 seconds
+    } else if ( interval == 2) {
+        timer.attach(this, &TemperaturePlot::plotData,1); // call ISR every 10 seconds
+    } else  {
+        timer.attach(this, &TemperaturePlot::plotData,5); // call ISR every 30 seconds
+    }
+
+    changeScreen = false;
+    debounce.start(); // start the debounce timer
+
+    while (!changeScreen) {
+
+        // mbed goes to sleep to save power
+        Sleep();
+
+    }
+    
+    // remove all interrupts
+    backButton.rise(NULL);
+    enterButton.rise(NULL);
+    timer.detach();
+    return nextScreen;
+}
+
+void TemperaturePlot::plotData()
+{
+    if (xCord > 83 ) {
+
+        xCord = 0; // reset the xCord back to zero
+
+        clearPlot(); // clear the plot region
+
+    }
+
+    float temperature = getTemperature(); // retreive temperature from the sensor
+
+    lcd.drawLine(xCord,(31*((50-temperature)/50)+16),xCord,47,1);
+
+    // print temperature onto the screen
+    sprintf(tempString,"%0.2f",temperature);
+    lcd.printString(tempString,0,1);
+
+    // increment the coordinate
+    xCord++;
+
+
+}
+
+void TemperaturePlot::onBack()
+{
+    if(debounceSuccess()) { // debouncing successful
+        // soundt the buzze
+        playSound();
+        nextScreen = -1;
+        changeScreen = true; // user wants to go to a different screen
+        // reset debounce timer
+        debounce.reset();
+    }
+
+}
+
+void TemperaturePlot::clearPlot()
+{
+    // clears the plot area
+
+    for ( int x = 0; x < 84; x++) {
+
+        for ( int y = 16; y < 48; y++) {
+
+            lcd.clearPixel(x,y);
+
+        }
+
+    }
+
+    lcd.refresh();
+
+}
+
+void TemperaturePlot::onEnter()
+{
+    if (debounceSuccess()) { // debouncing successful
+
+        playSound(); // play sound
+        pausePlot(); // pause any plotting
+        debounce.reset(); // reset debounce timer
+    }
+
+}
+
+void TemperaturePlot::pausePlot()
+{
+    pause = !pause;
+
+    if (pause) {
+        timer.detach(); // detach timer and stop plotting data
+    } else {
+
+        clearPlot(); // clear the plot area
+        xCord = 0; // start plotting from extreme left
+        plotData();
+        
+        // start plotting data again
+        if ( pInterval == 0) {
+            timer.attach(this, &TemperaturePlot::plotData,0.1); // call ISR every 0.1 second
+        } else if ( pInterval == 1) {
+            timer.attach(this, &TemperaturePlot::plotData,0.5); // call ISR every 0.5 seconds
+        } else if ( pInterval == 2) {
+            timer.attach(this, &TemperaturePlot::plotData,1); // call ISR every 1 seconds
+        } else  {
+            timer.attach(this, &TemperaturePlot::plotData,5); // call ISR every 5 seconds
+        }
+
+
+    }
+}
+
+#endif
\ No newline at end of file