lorenzo cervelli / Mbed 2 deprecated DisplayTemperature_Max7219-Max6675_SD

A program to measure the temperature using the Max6675 board. The temperature is shown on 8x8 Max7219 matrix display and it is saved on SD as well.

Dependencies:   MAX7219 SDFileSystem mbed

Fork of MAXREFDES99_demo by Maxim Integrated

The program measures the temperature using the Max6675 board designed for Arduino. The temperature is shown on Max7219 8x8 matrix display (designed for Arduino as well) as text marque from right to left. The fonf size is 5x7 so the last row is used to show some info:

- All leds off: Normal temperature measuring - Leds shifting: Saving on SD card - Leds blinking: SD card missing or damaged

The Blue "user button" is used to save measured temperature on SD card. First click start saving, the second stop the process. Together the temperature is saved also the time. The time is reset when the process start. Connecting the USB to PC it's possible to see instant temperature and all saved data on SD.

main.cpp@12:1bd4a9f09a8d, 2018-10-04 (annotated)

Committer:
lore71
Date:
Thu Oct 04 11:37:43 2018 +0000
Revision:
12:1bd4a9f09a8d
Parent:
8:a6a0c9e280ae 
A program to measure the temperature using the Max6675 board.; The temperature is shown on 8x8 Max7219 matrix display and it is saved on SD as well.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
lore71 12:1bd4a9f09a8d 1 // By Lorenzo Cervelli - Sept.2018
lore71 12:1bd4a9f09a8d 2 // OK su STM32-F401RE
lore71 12:1bd4a9f09a8d 3
lore71 12:1bd4a9f09a8d 4 #include "mbed.h"
lore71 12:1bd4a9f09a8d 5
lore71 12:1bd4a9f09a8d 6 // Display 8x8 con Max7219
pradipv 8:a6a0c9e280ae 7 #include "maxrefdes99.h"
j3 0:6b0161c3e440 8
lore71 12:1bd4a9f09a8d 9 // Sensore di temperatura con Max6675
lore71 12:1bd4a9f09a8d 10 #include "max6675.h"
lore71 12:1bd4a9f09a8d 11
lore71 12:1bd4a9f09a8d 12 // Per gestire la SD
lore71 12:1bd4a9f09a8d 13 #include "SDFileSystem.h"
lore71 12:1bd4a9f09a8d 14
lore71 12:1bd4a9f09a8d 15 // Per il pulsante 'on board'
lore71 12:1bd4a9f09a8d 16 InterruptIn my_button(USER_BUTTON);
lore71 12:1bd4a9f09a8d 17 bool Btn = 0;
lore71 12:1bd4a9f09a8d 18
lore71 12:1bd4a9f09a8d 19 // Per la SD
lore71 12:1bd4a9f09a8d 20 FILE *fp;
lore71 12:1bd4a9f09a8d 21 Serial pc(USBTX, USBRX);
lore71 12:1bd4a9f09a8d 22
lore71 12:1bd4a9f09a8d 23 // Per il tempo di funzionamento (da quando e' alimentato)
lore71 12:1bd4a9f09a8d 24 Timer t;
lore71 12:1bd4a9f09a8d 25
lore71 12:1bd4a9f09a8d 26 void pressed() // Per il pulsante 'on board'
lore71 12:1bd4a9f09a8d 27 {
lore71 12:1bd4a9f09a8d 28 // Resetto
lore71 12:1bd4a9f09a8d 29 if (Btn==0)
lore71 12:1bd4a9f09a8d 30 {
lore71 12:1bd4a9f09a8d 31 Btn=1;
lore71 12:1bd4a9f09a8d 32
lore71 12:1bd4a9f09a8d 33 // Rimuovo il file precedente
lore71 12:1bd4a9f09a8d 34 remove("/sd/sdtest.txt");
lore71 12:1bd4a9f09a8d 35 wait(1); // Lascio il tempo al file-system
lore71 12:1bd4a9f09a8d 36
lore71 12:1bd4a9f09a8d 37 // Apro il file sulla SD x la scrittura
lore71 12:1bd4a9f09a8d 38 printf(" OK, writing to SD card... \r\n");
lore71 12:1bd4a9f09a8d 39 fp = fopen("/sd/sdtest.txt", "w");
lore71 12:1bd4a9f09a8d 40 wait(2); // Lascio il tempo al file-system
lore71 12:1bd4a9f09a8d 41
lore71 12:1bd4a9f09a8d 42 // Faccio partire il tempo
lore71 12:1bd4a9f09a8d 43 t.start();
lore71 12:1bd4a9f09a8d 44 }
lore71 12:1bd4a9f09a8d 45 else
lore71 12:1bd4a9f09a8d 46 {
lore71 12:1bd4a9f09a8d 47 Btn=0;
lore71 12:1bd4a9f09a8d 48
lore71 12:1bd4a9f09a8d 49 // Chiudo il file
lore71 12:1bd4a9f09a8d 50 fclose(fp);
lore71 12:1bd4a9f09a8d 51 printf(" OK successfully saved! \r\n");
lore71 12:1bd4a9f09a8d 52
lore71 12:1bd4a9f09a8d 53 // Lascio il tempo al file-system
lore71 12:1bd4a9f09a8d 54 wait(1);
lore71 12:1bd4a9f09a8d 55
lore71 12:1bd4a9f09a8d 56 // Fermo il tempo
lore71 12:1bd4a9f09a8d 57 t.stop();
lore71 12:1bd4a9f09a8d 58
lore71 12:1bd4a9f09a8d 59 // Leggo tutto il file delle temperature e mostro sulla seriale
lore71 12:1bd4a9f09a8d 60 int c;
lore71 12:1bd4a9f09a8d 61 pc.printf("\n Reading from SD card... \r\n");
lore71 12:1bd4a9f09a8d 62 pc.printf(" ----- BEGIN ----- \r\n");
lore71 12:1bd4a9f09a8d 63 fp = fopen("/sd/sdtest.txt", "r");
lore71 12:1bd4a9f09a8d 64 if (fp)
lore71 12:1bd4a9f09a8d 65 {
lore71 12:1bd4a9f09a8d 66 while ((c = getc(fp)) != EOF)
lore71 12:1bd4a9f09a8d 67 pc.putc(c);
lore71 12:1bd4a9f09a8d 68 fclose(fp);
lore71 12:1bd4a9f09a8d 69 }
lore71 12:1bd4a9f09a8d 70 pc.printf(" ----- END ----- \r\n");
lore71 12:1bd4a9f09a8d 71 }
lore71 12:1bd4a9f09a8d 72 }
j3 0:6b0161c3e440 73
j3 0:6b0161c3e440 74 int main(void)
lore71 12:1bd4a9f09a8d 75 {
lore71 12:1bd4a9f09a8d 76 // Sensore di temperatura con Max6675 (Morpho Connectors su F401RE)
lore71 12:1bd4a9f09a8d 77 SPI spi(PC_12, PC_11, PC_10); // MOSI, MISO, SCLK
lore71 12:1bd4a9f09a8d 78 max6675 max(spi, PA_14); // CS
lore71 12:1bd4a9f09a8d 79
lore71 12:1bd4a9f09a8d 80 // Scheda di memoria SD (Arduino Connectors su F401RE)
lore71 12:1bd4a9f09a8d 81 SDFileSystem sd(D11, D12, D13, D8, "sd");// MOSI, MISO, SCK, CS
lore71 12:1bd4a9f09a8d 82
lore71 12:1bd4a9f09a8d 83 // Settaggi SPI per 8x8 Led matrix Max7219 (Morpho Connectors su F401RE)
lore71 12:1bd4a9f09a8d 84 // PB_15 --> DIN (MOSI)
lore71 12:1bd4a9f09a8d 85 // PB_13 --> CLK (SCK)
lore71 12:1bd4a9f09a8d 86 // PB_1 --> LOAD (CS)
lore71 12:1bd4a9f09a8d 87 // PB_14 --> MISO
lore71 12:1bd4a9f09a8d 88 Max7219 display(PB_15, PB_14, PB_13, PB_1);
j3 0:6b0161c3e440 89
j3 0:6b0161c3e440 90 //struct for holding MAX7219 configuration data
j3 0:6b0161c3e440 91 max7219_configuration_t display_config;
pradipv 8:a6a0c9e280ae 92
lore71 12:1bd4a9f09a8d 93 // MAX7219 configuration data
lore71 12:1bd4a9f09a8d 94 display_config.decode_mode = 0; // no BCD decode
lore71 12:1bd4a9f09a8d 95 display_config.intensity = Max7219::MAX7219_INTENSITY_F; // max intensity
lore71 12:1bd4a9f09a8d 96 display_config.scan_limit = Max7219::MAX7219_SCAN_8; // scan all digits
j3 0:6b0161c3e440 97
lore71 12:1bd4a9f09a8d 98 // MAX7219 set number of MAX7219 devices being used
lore71 12:1bd4a9f09a8d 99 display.set_num_devices(1);
j3 0:6b0161c3e440 100
lore71 12:1bd4a9f09a8d 101 // MAX7219 config display
j3 0:6b0161c3e440 102 display.init_display(display_config);
j3 0:6b0161c3e440 103
lore71 12:1bd4a9f09a8d 104 // MAX7219 ensure all data registers are 0
j3 0:6b0161c3e440 105 display.display_all_off();
j3 0:6b0161c3e440 106 display.enable_display();
j3 0:6b0161c3e440 107
lore71 12:1bd4a9f09a8d 108 // MAX7219 variables
lore71 12:1bd4a9f09a8d 109 uint32_t user_input = 0;
j3 0:6b0161c3e440 110 char user_char;
lore71 12:1bd4a9f09a8d 111 char *p_str;
lore71 12:1bd4a9f09a8d 112
lore71 12:1bd4a9f09a8d 113 // MAX7219 Luminosita' (value from 0 to 15)
lore71 12:1bd4a9f09a8d 114 display_config.intensity = 5;
lore71 12:1bd4a9f09a8d 115 display.init_display(display_config);
lore71 12:1bd4a9f09a8d 116
lore71 12:1bd4a9f09a8d 117 // MAX7219 Posizione di partenza (value from 1 to 32)
lore71 12:1bd4a9f09a8d 118 user_char = 1;
lore71 12:1bd4a9f09a8d 119 print_char(&display, user_input, user_char);
lore71 12:1bd4a9f09a8d 120
lore71 12:1bd4a9f09a8d 121 // MAX7219 Contatore per utilizzare l'ultima riga della matrice 8x8
lore71 12:1bd4a9f09a8d 122 int Cur=1;
j3 0:6b0161c3e440 123
lore71 12:1bd4a9f09a8d 124 // Set button 'on board'
lore71 12:1bd4a9f09a8d 125 my_button.fall(&pressed);
lore71 12:1bd4a9f09a8d 126
lore71 12:1bd4a9f09a8d 127 // Ciclo continuo
lore71 12:1bd4a9f09a8d 128 while(1)
lore71 12:1bd4a9f09a8d 129 {
lore71 12:1bd4a9f09a8d 130 int cnt;
lore71 12:1bd4a9f09a8d 131 int idx;
lore71 12:1bd4a9f09a8d 132
lore71 12:1bd4a9f09a8d 133 // Leggo la temperatura del Max6675
lore71 12:1bd4a9f09a8d 134 float TC = max.read_temp();
lore71 12:1bd4a9f09a8d 135 // Lascio il tempo al sensore di temperatura
lore71 12:1bd4a9f09a8d 136 wait(0.5);
lore71 12:1bd4a9f09a8d 137
lore71 12:1bd4a9f09a8d 138 // Stampo sulla seriale (Temperatura con 2 digits dopo la virgola e Time con 3 digits dopo la virgola)
lore71 12:1bd4a9f09a8d 139 printf(" Temperature(C): %.2f Time(Sec): %.3f \r\n", TC, t.read());
lore71 12:1bd4a9f09a8d 140
lore71 12:1bd4a9f09a8d 141 // Scrivo nel file sulla SD
lore71 12:1bd4a9f09a8d 142 if (Btn==1)
j3 0:6b0161c3e440 143 {
lore71 12:1bd4a9f09a8d 144 // Scrivo nel file sulla SD
lore71 12:1bd4a9f09a8d 145 if (fp != NULL)
lore71 12:1bd4a9f09a8d 146 {
lore71 12:1bd4a9f09a8d 147 fprintf(fp, "Temperature(C): %.2f Time(Sec): %.3f \r\n", TC, t.read());
lore71 12:1bd4a9f09a8d 148
lore71 12:1bd4a9f09a8d 149 // Lascio il tempo al file-system
lore71 12:1bd4a9f09a8d 150 wait(0.1);
lore71 12:1bd4a9f09a8d 151
lore71 12:1bd4a9f09a8d 152 // Accendo i digit dell'ultima riga della matrice in sequenza per far vedere che sto' registrando
lore71 12:1bd4a9f09a8d 153 if (Cur==1){ display.write_digit(1, 8, 0x01); } // n of matrix, column, byte
lore71 12:1bd4a9f09a8d 154 if (Cur==2){ display.write_digit(1, 7, 0x01); } // n of matrix, column, byte
lore71 12:1bd4a9f09a8d 155 if (Cur==3){ display.write_digit(1, 6, 0x01); } // n of matrix, column, byte
lore71 12:1bd4a9f09a8d 156 if (Cur==4){ display.write_digit(1, 5, 0x01); } // n of matrix, column, byte
lore71 12:1bd4a9f09a8d 157 if (Cur==5){ display.write_digit(1, 4, 0x01); } // n of matrix, column, byte
lore71 12:1bd4a9f09a8d 158 if (Cur==6){ display.write_digit(1, 3, 0x01); } // n of matrix, column, byte
lore71 12:1bd4a9f09a8d 159 if (Cur==7){ display.write_digit(1, 2, 0x01); } // n of matrix, column, byte
lore71 12:1bd4a9f09a8d 160 if (Cur==8)
lore71 12:1bd4a9f09a8d 161 {
lore71 12:1bd4a9f09a8d 162 display.write_digit(1, 1, 0x01); // n of matrix, column, byte
lore71 12:1bd4a9f09a8d 163 Cur=0;
lore71 12:1bd4a9f09a8d 164 }
lore71 12:1bd4a9f09a8d 165 // Incremento il contatore per utilizzare l'ultima riga della matrice 8x8
lore71 12:1bd4a9f09a8d 166 Cur++;
lore71 12:1bd4a9f09a8d 167 }
lore71 12:1bd4a9f09a8d 168 else
lore71 12:1bd4a9f09a8d 169 {
lore71 12:1bd4a9f09a8d 170 int f;
lore71 12:1bd4a9f09a8d 171 for(f = 0; f <= 9; f++)
lore71 12:1bd4a9f09a8d 172 {
lore71 12:1bd4a9f09a8d 173 display.write_digit(1, f, 0x01);
lore71 12:1bd4a9f09a8d 174 }
lore71 12:1bd4a9f09a8d 175
lore71 12:1bd4a9f09a8d 176 printf(" Write failed! \r\n");
lore71 12:1bd4a9f09a8d 177 Btn=0;
lore71 12:1bd4a9f09a8d 178 }
lore71 12:1bd4a9f09a8d 179
lore71 12:1bd4a9f09a8d 180 // Tempo accensione led
lore71 12:1bd4a9f09a8d 181 wait(0.5);
lore71 12:1bd4a9f09a8d 182
lore71 12:1bd4a9f09a8d 183 printf(" Press button to stop saving \r\n");
j3 0:6b0161c3e440 184 }
lore71 12:1bd4a9f09a8d 185 else
lore71 12:1bd4a9f09a8d 186 {
lore71 12:1bd4a9f09a8d 187 printf(" Press button to save \r\n");
lore71 12:1bd4a9f09a8d 188 }
lore71 12:1bd4a9f09a8d 189
lore71 12:1bd4a9f09a8d 190 // Floating to Char
lore71 12:1bd4a9f09a8d 191 char array[6]; // Numero dei digits (virgola compresa)
lore71 12:1bd4a9f09a8d 192 snprintf(array, sizeof(array), "%f", TC);
lore71 12:1bd4a9f09a8d 193
lore71 12:1bd4a9f09a8d 194 // Concatenzaione tra Float e String in un nuovo Char
lore71 12:1bd4a9f09a8d 195 char* Aggiunta="^C "; // NB: Deve finire con 2 spazi alla fine
lore71 12:1bd4a9f09a8d 196 char dest[sizeof(array)+sizeof(Aggiunta)]; // Size dell'array precedente + size di quello dellaggiunta
lore71 12:1bd4a9f09a8d 197 strcpy( dest, array );
lore71 12:1bd4a9f09a8d 198 strcat( dest, Aggiunta );
lore71 12:1bd4a9f09a8d 199
lore71 12:1bd4a9f09a8d 200 // Faccio il reverse del testo
lore71 12:1bd4a9f09a8d 201 size_t l = strlen(dest);
lore71 12:1bd4a9f09a8d 202 char* r = (char*)malloc((l + 1) * sizeof(char));
lore71 12:1bd4a9f09a8d 203 r[l] = '\0';
lore71 12:1bd4a9f09a8d 204 int i;
lore71 12:1bd4a9f09a8d 205 for(i = 0; i < l; i++)
lore71 12:1bd4a9f09a8d 206 {
lore71 12:1bd4a9f09a8d 207 r[i] = dest[l - 1 - i];
lore71 12:1bd4a9f09a8d 208 }
lore71 12:1bd4a9f09a8d 209 // Riassegno
lore71 12:1bd4a9f09a8d 210 p_str = r;
lore71 12:1bd4a9f09a8d 211
lore71 12:1bd4a9f09a8d 212 // Testo nello shift register
lore71 12:1bd4a9f09a8d 213 print_string(&display, user_input, p_str);
lore71 12:1bd4a9f09a8d 214
lore71 12:1bd4a9f09a8d 215 // Valore per scorrere l'intero testo
lore71 12:1bd4a9f09a8d 216 cnt=strlen(r)*6; // num char *6 (5 char + 1 space)
lore71 12:1bd4a9f09a8d 217 for(idx = 0; idx < cnt; idx++)
lore71 12:1bd4a9f09a8d 218 {
lore71 12:1bd4a9f09a8d 219 // Scorro la matrice
lore71 12:1bd4a9f09a8d 220 shift_display_right(&display, 1, 50);
lore71 12:1bd4a9f09a8d 221 }
j3 0:6b0161c3e440 222 }
lore71 12:1bd4a9f09a8d 223
j3 0:6b0161c3e440 224 }