Diff: main.cpp

Revision:

0:7e22a0e87f8e

Child:

1:5c0b32a77708

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon May 12 21:04:00 2014 +0000
@@ -0,0 +1,584 @@
+/************************************************************************
+ * Simple indoor weather station with TFT display
+ *
+ * Sensors: AM2302 aka DHT22 hygrometer thermometer 
+ *          BMP180 barometer atmospheric pressure
+ *  
+ * Real time clock: DS3231
+ * Storage:         24c32 (on rtc board)
+ *  
+ * Board: ST NUCLEO-L152RE
+ *        cheap 2.2inch 320x240 TFT with SPI-Interface and SDCard socket. 
+ *
+ * Data stored every 10 minutes into file and 8K byte EEPROM 
+ *
+ * EEPROM storage: 
+ * 576 values of temp, hygro and barometer (about 4 days) 
+ * Format: day, hour, min, temp, humidity, preasure
+ *         pressure will cover 940hpa to 1060hpa 
+ *
+ * Similar program exists for a E-Paper display and Seeduino Arch Pro.
+ * will release this code later.
+ ************************************************************************/
+
+//#define NO_DMA
+
+#include "stdio.h"
+#include "mbed.h"
+#include "string"
+
+// TFT and SDCard
+#include "SDFileSystem.h"
+#include "SPI_TFT_ILI9341.h"
+
+// RTC, EEPROM sensors
+#include "DS3231.h"
+#include "_24LCXXX.h"
+#include "BMP180.h"
+#include "RHT03.h" //AM2303
+
+// some fonts
+#include "Courier9x15.h"
+#include "Arial12x12.h"
+#include "Times_New_Roman28x27.h"
+
+// my functions
+void drawClock(void);
+void drawAnalogTime(void);
+void drawDigitalTime(void);
+void drawTemp(void);
+void drawPressure(void);
+void SetTime(void);
+void UpdateDisplay(void);
+void storeData(void);
+void showGraph(void);
+int map (int ,int , int , int , int);
+
+char store_temp, store_humidity, store_pressure;
+
+extern unsigned char p1[];  // the mbed logo
+
+// analog clock size and locate
+#define CLOCK_RADIUS 64           // radius of clock face
+#define CLOCK_CENTER_X 68         // If you adjust the radius, you'll probably want to adjust this
+#define CLOCK_CENTER_Y 68         // If you adjust the radius, you'll probably want to adjust this
+
+// Maximum of stored value into eeprom
+#define max_datastorage 576       // 576 * 6 = 3456
+#define COUNTERADDRESS 4000       // The counter for ring buffer will be stored here 
+
+// the TFT is connected to SPI
+SPI_TFT_ILI9341 TFT(PA_7, PA_6, PA_5, PB_6, PA_9, PC_7,"TFT"); // NUCLEO mosi, miso, sclk, cs, reset, dc
+
+// SDCard on SPI2 at morpho connectors
+SDFileSystem sd(PB_15, PB_14, PB_13, PB_12, "sd"); // MOSI, MISO, SCLK, SSEL
+
+I2C i2c(PB_9, PB_8);            // sda, scl
+BMP180 bmp(PB_9, PB_8);
+DS3231 rtc(PB_9,PB_8);
+_24LCXXX eeprom(&i2c, 0x57);
+RHT03 humtemp(PA_10); //Initalise the RHT03 (change pin number to the pin its connected to)
+
+// set interrupts
+InterruptIn RTCInt(PB_4);
+InterruptIn ShowGraphInt(PB_5);
+
+int main()
+{
+    char Control;
+    //unsigned int y;
+
+    // Test if SD-Card works
+    //FILE *fp = fopen("/sd/mbed.txt", "a");
+    //fprintf(fp, "Hello World!\n");
+    //fclose(fp);
+
+    TFT.set_orientation(0);
+    TFT.claim(stdout);      // send stdout to the TFT display
+    TFT.claim(stderr);      // send stderr to the TFT display
+    TFT.background(White);    // set background to black
+    TFT.foreground(Black);    // set chars to white
+    TFT.cls();                // clear the screen
+
+    //y= 0;
+    //TFT.background(Black);
+    //TFT.cls();
+
+    TFT.set_font((unsigned char*) Arial12x12);
+    int err = TFT.BMP_16(9,12,"/sd/Carina.bmp");  // load test.bmp from external SD-card
+    TFT.locate(10,120);
+    if (err != 1) TFT.printf(" - Err: %d",err);
+    wait(2);
+
+    TFT.cls();                // clear the screen
+    TFT.locate(0,0);
+    printf("  Hello Mbed ");
+    TFT.Bitmap(20,20,172,55,p1);
+    
+    // set the DS3231 for alarm every minute. 
+    rtc.writeRegister(DS3231_Alarm2_Minutes,0x80);
+    rtc.writeRegister(DS3231_Alarm2_Hours,0x80);
+    rtc.writeRegister(DS3231_Alarm_2_Day_Date,0x80);
+
+    Control = rtc.readRegister(DS3231_Control);
+    Control = Control|DS3231_bit_A2IE;
+    Control = Control|DS3231_bit_INTCN;
+    rtc.writeRegister(DS3231_Control,Control);
+
+    Control=rtc.readRegister(DS3231_Control_Status)&0xFC;
+    rtc.writeRegister(DS3231_Control_Status,Control);
+
+
+    wait(1);        // wait two seconds
+
+    UpdateDisplay();
+
+    RTCInt.fall(&UpdateDisplay);     // interrupt for display update every minute called by rtc alarm
+
+    ShowGraphInt.fall(&showGraph);  // interrupt for showing value history diagram. called by a button or capacitive touch switch
+
+    while(1) {
+        wait(10.0);
+    }
+}
+
+
+void UpdateDisplay(void)
+{
+
+    //led2 = 0;
+
+    TFT.cls();
+
+    TFT.fillrect(237,317,239,319,Red); // Just for status: during update there is a small red dot at the bottom right corner
+    
+    drawClock();
+    drawAnalogTime();
+    drawDigitalTime();
+
+    drawPressure();
+
+    drawTemp();
+
+    storeData();
+    
+    TFT.fillrect(237,317,239,319,White);
+
+    // Reset clock alarm
+    char Control=rtc.readRegister(DS3231_Control_Status)& 0xFC;
+    rtc.writeRegister(DS3231_Control_Status,Control);
+
+    //led2 = 1;
+
+}
+
+// store every ten minute values into file and eeprom
+void storeData(void)
+{
+    int date, month, year, hour, minute, second, dayOfWeek;
+    unsigned int store_address;
+    char b[6];
+
+    //led1=0;
+
+    rtc.readDateTime(&dayOfWeek,&date,&month,&year,&hour,&minute,&second);
+
+    // Save only every 10 minutes
+    if ( minute%10 == 0) {
+
+        /* Store into EEPROM */
+        eeprom.nbyte_read( COUNTERADDRESS, &store_address, sizeof(int) );
+
+        if ( store_address > (max_datastorage * 6)) {
+            store_address = 0;
+        }
+
+        b[0] = date;
+        b[1] = hour;
+        b[2] = minute;
+        b[3] = store_temp;
+        b[4] = store_humidity;
+        b[5] = store_pressure;
+
+        eeprom.nbyte_write( store_address, &b, 6);
+
+        store_address += 6;
+
+        eeprom.nbyte_write(COUNTERADDRESS,&store_address,sizeof(int));
+        
+        // Store into file
+        FILE *fp = fopen("/sd/stored_data.txt", "a");
+        fprintf(fp, "%02i %02i %02i:%02i %02i %cC %02i %% %04i hPa\n",month, date, hour, minute, store_temp, 176, store_humidity, (store_pressure+1880) * 50 / 100);
+        fclose(fp);
+
+    }
+
+    //led1=1;
+}
+
+// show grap of stored data (at the moment landscape oriented. not yet changed to potrait display)
+void showGraph(void)
+{
+    unsigned int store_address,i;
+    char b[6];
+    char temp_arr[204], temp_min, temp_max;
+    char humidity_arr[204], hum_min, hum_max;
+    int pressure_arr[204], press_min, press_max;
+
+    eeprom.nbyte_read( COUNTERADDRESS, &store_address, sizeof(int) );
+
+    TFT.set_font((unsigned char*) Courier9x15);
+
+    TFT.set_orientation(1);
+    TFT.cls();
+    TFT.line(58,8,58,50,0);
+    TFT.line(56,48,263,48,0);
+    TFT.line(58,60,58,102,0);
+    TFT.line(56,100,263,100,0);
+    TFT.line(58,112,58,154,0);
+    TFT.line(56,152,263,152,0);
+
+    // store_address is allways one step ahead of last stored values
+    if ( store_address == 0)
+        store_address = max_datastorage * 6;
+    else
+        store_address -= 6;
+
+    // read from eeprom, store into array, find min and max values
+    temp_min = 100;
+    hum_min = 99;
+    press_min = 1150;
+    temp_max = 0;
+    hum_max = 0;
+    press_max = 0;
+
+    // Read from EEPROM storage into arrays
+    for (i=0; i<204; i++) {
+        eeprom.nbyte_read( store_address, &b, 6);
+
+        // draw every 2 hour an line
+        if ( b[2] == 0 && (b[1]%4 == 0 || b[1] == 0) ) {
+            TFT.line(263-i,46,263-i,50,1);
+            TFT.line(263-i,98,263-i,102,1);
+            TFT.line(263-i,150,263-i,154,1);
+            TFT.locate(254-i,158);
+            if ( i > 15 )                     // do not write at the right border
+                printf("%2i",b[1]);
+        }
+
+        // store temp into array and check min max
+        temp_arr[i] = b[3];
+        if ( b[3] < temp_min )
+            temp_min = b[3];
+        if ( b[3] > temp_max )
+            temp_max = b[3];
+
+        // store humidity into array and check min max
+        humidity_arr[i] = b[4];
+        if ( b[4] < hum_min )
+            hum_min = b[4];
+        if ( b[4] > hum_max )
+            hum_max = b[4];
+
+        // store pressure into array and check min max
+        pressure_arr[i] = (b[5]+1880) * 50 / 100; // calculate pressure to Pascal and hektoPascal
+        if ( pressure_arr[i] < 990 )
+            pressure_arr[i] = 1000;
+
+        if ( pressure_arr[i] < press_min )
+            press_min = pressure_arr[i];
+        if ( pressure_arr[i] > press_max )
+            press_max = pressure_arr[i];
+
+        if ( store_address == 0)
+            store_address = max_datastorage * 6;
+        else
+            store_address -= 6;
+    }
+
+    // rounding min and max to 5
+    temp_min -= 1;
+    temp_min = temp_min - (temp_min%5);
+    temp_max += 1;
+    temp_max = temp_max + (5 - (temp_max%5));
+    TFT.locate(0,2);
+    printf("%i%cC",temp_max,127);
+    TFT.locate(0,40);
+    printf("%i%cC",temp_min,127);
+
+    hum_min -= 1;
+    hum_min = hum_min - (hum_min%5);
+    hum_max += 1;
+    hum_max = hum_max + (5 - (hum_max%5));
+    TFT.locate(0,54);
+    printf("%i%%",hum_max);
+    TFT.locate(0,92);
+    printf("%i%%",hum_min);
+
+    press_min -= 1;
+    press_min = press_min - (press_min%5);
+    press_max += 1;
+    press_max = press_max + (5 - (press_max%5));
+    TFT.locate(0,106);
+    printf("%ihPa",press_max);
+    TFT.locate(0,144);
+    printf("%ihPa",press_min);
+
+    // drawing lines
+    for (i=0; i<204; i++) {
+        // temp line
+        TFT.pixel(263-i,map(temp_arr[i],temp_min,temp_max,48,8),Red);
+        // humidity line
+        TFT.pixel(263-i,map(humidity_arr[i],hum_min,hum_max,100,60),Blue);
+        // pressure line
+        TFT.pixel(263-i,map(pressure_arr[i],press_min,press_max,152,112),Green);
+
+    }
+
+    //epaper.write_disp(); // update screen
+    TFT.set_orientation(0);
+
+}
+
+// draw temp and humidity
+void drawTemp(void)
+{
+    int done=0;
+    float temp,hum;
+    while(!done) { //Loop keeps running until RHT03 is read succesfully
+        wait(2.2); //Needed to make sure the sensor has time to initalise and so its not polled too quickly
+        if(humtemp.readData() == RHT_ERROR_NONE) done=1; //Request data from the RHT03
+    }
+
+    temp = humtemp.getTemperatureC(); //Gets the current temperature in centigrade
+    store_temp = temp;
+    hum = humtemp.getHumidity(); //Gets the current humidity in percentage
+    store_humidity = hum;
+
+    TFT.set_font((unsigned char*) Times_New_Roman28x27);  // select the font
+    TFT.locate(156,0);
+    printf("%2.0f%cC",temp,127);
+    TFT.locate(156,31);
+    printf("%2.0f%%",hum);
+
+}
+
+// read and draw air pressure. later calculate symbol for wheather guess regarding pressure change.
+void drawPressure(void)
+{
+    long Pressure, BMP180_Temperature;
+
+    bmp.readTP(&BMP180_Temperature,&Pressure,OVERSAMPLING_STANDARD);
+
+    store_pressure = char((Pressure / 50) - 1880);
+
+    TFT.set_font((unsigned char*) Times_New_Roman28x27);  // select the font
+    TFT.locate(0,138);
+    printf("%4dhPa",Pressure / 100);
+    TFT.set_font((unsigned char*) Courier9x15);
+    TFT.locate(0,168);
+    printf("%i,%1i%cC",BMP180_Temperature/10,BMP180_Temperature%10,127);
+
+    // Draw some weather icons for test
+    int err ;
+    err = TFT.BMP_16(2,190,"/sd/rain.bmp");  // load test.bmp from external SD-card
+    if (err != 1) TFT.printf(" - Err: %d",err);
+    
+    err = TFT.BMP_16(76,190,"/sd/cloud.bmp");  // load test.bmp from external SD-card
+    if (err != 1) TFT.printf(" - Err: %d",err);
+    
+    err = TFT.BMP_16(150,190,"/sd/sun.bmp");  // load test.bmp from external SD-card
+    if (err != 1) TFT.printf(" - Err: %d",err);
+
+}
+
+// draw digital date and time.
+void drawDigitalTime()
+{
+    //SetTime(); // Call only once to set date and time on DS3231
+    
+    int date, month, year, hour, minute, second, dayOfWeek;
+
+    rtc.readDateTime(&dayOfWeek,&date,&month,&year,&hour,&minute,&second);
+
+    TFT.set_font((unsigned char*) Times_New_Roman28x27);  // select the font
+    TFT.locate(0,290);
+
+    if (date > 0) {
+        printf("%02i.%02i.%i %02i:%02d",date,month,year,hour,minute);
+    } else {
+        printf("Error read RTC");
+    }
+
+}
+
+// guess what ;-)
+void SetTime()
+{
+    // DS3231
+    // hour,minute,second
+    rtc.setTime(23,39,0);
+    // dayofweek,day,month,year
+    rtc.setDate(3,10,5,2014);
+
+}
+
+// draw hands into analog clock
+void drawAnalogTime()
+{
+    int x1, x2, y1, y2, x3, y3, m, h, midHours, second;
+
+    rtc.readTime(&h,&m,&second);
+
+    // Draw minute hand
+    midHours = m/12;
+    m -= 30;
+    if ( m < 0 )
+        m += 60;
+
+    m = map(m,0,60,360,0);
+
+    // Center for single line hand
+    // double line hand
+    x1 = CLOCK_CENTER_X + 3 * sin(3.14 * ((double) (m - 90))/180);
+    y1 = CLOCK_CENTER_Y + 3 * cos(3.14 * ((double) (m - 90))/180);
+    x3 = CLOCK_CENTER_X + 3 * sin(3.14 * ((double) (m + 90))/180);
+    y3 = CLOCK_CENTER_Y + 3 * cos(3.14 * ((double) (m + 90))/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 20) * sin(3.14 * ((double) m)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 20) * cos(3.14 * ((double) m)/180);
+    TFT.line(x1,y1,x2,y2,0x001F);
+    TFT.line(x3,y3,x2,y2,0x001F);
+    TFT.line(x1,y1,x3,y3,0x001F);
+
+    // Draw hour hand
+
+    // Calc from 24 to 12 hour
+    if ( h > 11 )
+        h -= 12;
+
+    // Rotate 180°. Otherwise clock will be printed upside down
+    h = h - 6;
+    if ( h < 0 )
+        h += 12;
+
+    // minute correction for hour hand
+    h *= 5;
+    h += midHours;
+
+    h = map(h,0,60,360,0);
+
+    x1 = CLOCK_CENTER_X + 3 * sin(3.14 * ((double) (h - 90))/180);
+    y1 = CLOCK_CENTER_Y + 3 * cos(3.14 * ((double) (h - 90))/180);
+    x3 = CLOCK_CENTER_X + 3 * sin(3.14 * ((double) (h + 90))/180);
+    y3 = CLOCK_CENTER_Y + 3 * cos(3.14 * ((double) (h + 90))/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 32) * sin(3.14 * ((double) h)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 32) * cos(3.14 * ((double) h)/180);
+    TFT.line(x1,y1,x2,y2,0xF400);
+    TFT.line(x3,y3,x2,y2,0xF400);
+    TFT.line(x1,y1,x3,y3,0xF400);
+
+}
+
+
+// Draw analog clock w/o hands
+void drawClock(void)
+{
+    int x1, x2, y1, y2;
+
+    TFT.background(White);    // set background to black
+    TFT.foreground(Black);    // set chars to white
+    TFT.set_font((unsigned char*) Arial12x12);
+
+    TFT.fillcircle(CLOCK_CENTER_X,CLOCK_CENTER_Y,CLOCK_RADIUS,0x0000);
+    TFT.fillcircle(CLOCK_CENTER_X,CLOCK_CENTER_Y,CLOCK_RADIUS-4,0xFFFF);
+
+    /*
+        TFT.locate( CLOCK_CENTER_X - 8, CLOCK_CENTER_Y  - CLOCK_RADIUS + 6);
+        printf("12");
+        TFT.locate( CLOCK_CENTER_X - CLOCK_RADIUS + 6, CLOCK_CENTER_Y - 6);
+        printf("9");
+        TFT.locate( CLOCK_CENTER_X + CLOCK_RADIUS - 12, CLOCK_CENTER_Y - 6);
+        printf("3");
+        TFT.locate( CLOCK_CENTER_X - 2, CLOCK_CENTER_Y + CLOCK_RADIUS - 15);
+        printf("6");
+    */
+
+    x1 = CLOCK_CENTER_X - 1;
+    y1 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 16);
+    x2 = CLOCK_CENTER_X + 1;
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 6);
+    TFT.fillrect(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X - 1;
+    y1 = CLOCK_CENTER_Y - (CLOCK_RADIUS - 6);
+    x2 = CLOCK_CENTER_X + 1;
+    y2 = CLOCK_CENTER_Y - (CLOCK_RADIUS - 16);
+    TFT.fillrect(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X + (CLOCK_RADIUS - 16);
+    y1 = CLOCK_CENTER_Y - 1;
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 6);
+    y2 = CLOCK_CENTER_Y + 1;
+    TFT.fillrect(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X - (CLOCK_RADIUS - 6);
+    y1 = CLOCK_CENTER_Y - 1;
+    x2 = CLOCK_CENTER_X - (CLOCK_RADIUS - 16);
+    y2 = CLOCK_CENTER_Y + 1;
+    TFT.fillrect(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X + (CLOCK_RADIUS - 13) * sin(3.14 * ((double) 30)/180);
+    y1 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 13) * cos(3.14 * ((double) 30)/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 6) * sin(3.14 * ((double) 30)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 6) * cos(3.14 * ((double) 30)/180);
+    TFT.line(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X + (CLOCK_RADIUS - 13) * sin(3.14 * ((double) 60)/180);
+    y1 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 13) * cos(3.14 * ((double) 60)/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 6) * sin(3.14 * ((double) 60)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 6) * cos(3.14 * ((double) 60)/180);
+    TFT.line(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X + (CLOCK_RADIUS - 13) * sin(3.14 * ((double) 120)/180);
+    y1 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 13) * cos(3.14 * ((double) 120)/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 6) * sin(3.14 * ((double) 120)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 6) * cos(3.14 * ((double) 120)/180);
+    TFT.line(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X + (CLOCK_RADIUS - 13) * sin(3.14 * ((double) 150)/180);
+    y1 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 13) * cos(3.14 * ((double) 150)/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 6) * sin(3.14 * ((double) 150)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 6) * cos(3.14 * ((double) 150)/180);
+    TFT.line(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X + (CLOCK_RADIUS - 13) * sin(3.14 * ((double) 210)/180);
+    y1 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 13) * cos(3.14 * ((double) 210)/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 6) * sin(3.14 * ((double) 210)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 6) * cos(3.14 * ((double) 210)/180);
+    TFT.line(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X + (CLOCK_RADIUS - 13) * sin(3.14 * ((double) 240)/180);
+    y1 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 13) * cos(3.14 * ((double) 240)/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 6) * sin(3.14 * ((double) 240)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 6) * cos(3.14 * ((double) 240)/180);
+    TFT.line(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X + (CLOCK_RADIUS - 13) * sin(3.14 * ((double) 300)/180);
+    y1 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 13) * cos(3.14 * ((double) 300)/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 6) * sin(3.14 * ((double) 300)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 6) * cos(3.14 * ((double) 300)/180);
+    TFT.line(x1,y1,x2,y2,0x0000);
+
+    x1 = CLOCK_CENTER_X + (CLOCK_RADIUS - 13) * sin(3.14 * ((double) 330)/180);
+    y1 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 13) * cos(3.14 * ((double) 330)/180);
+    x2 = CLOCK_CENTER_X + (CLOCK_RADIUS - 6) * sin(3.14 * ((double) 330)/180);
+    y2 = CLOCK_CENTER_Y + (CLOCK_RADIUS - 6) * cos(3.14 * ((double) 330)/180);
+    TFT.line(x1,y1,x2,y2,0x0000);
+
+}
+
+// Map funktion copied from Arduino code
+int map (int x, int in_min, int in_max, int out_min, int out_max)
+{
+    return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+}
\ No newline at end of file