Sam Russell / Mbed 2 deprecated Distance_Sensor_SRF02

A program designed to get the distance from an SRF02 distance sensor and create an audible and visual indication of that distance with data logging capabilities.

Dependencies:   N5110 PowerControl SRF02 mbed

main.cpp@15:619c711e9b53, 2015-05-08 (annotated)

Committer:
el13sr
Date:
Fri May 08 10:58:40 2015 +0000
Revision:
15:619c711e9b53
Parent:
14:acb6e07992bd 
1.0c - Fixed an error where the time once set over the serial would reset due to an initial condition within the main function.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
el13sr 7:65bdd2d0d6ad 1 /**
el13sr 7:65bdd2d0d6ad 2 * @file main.cpp
el13sr 7:65bdd2d0d6ad 3 * @brief Distance Sensor Project
el13sr 7:65bdd2d0d6ad 4 * @brief Main file containing all of the functions and the int main().
el13sr 15:619c711e9b53 5 * @brief Version: 1.0c
el13sr 7:65bdd2d0d6ad 6 * @author Sam Russell
el13sr 7:65bdd2d0d6ad 7 * @date March 2015
el13sr 7:65bdd2d0d6ad 8 */
el13sr 0:7d01de89a1ff 9
el13sr 1:387d5e6fa05f 10 #include "main.h"
el13sr 0:7d01de89a1ff 11
el13sr 7:65bdd2d0d6ad 12
el13sr 4:0bd5c189f2f3 13 void welcomeScreen()
el13sr 4:0bd5c189f2f3 14 {
el13sr 12:babcce84f9c8 15 display.init(); // Initialise the display.
el13sr 12:babcce84f9c8 16 display.clear(); // Clears the starting pattern from the screen.
el13sr 12:babcce84f9c8 17 display.printString("--++--++--++--",0,0); //Print string of "" at x,y locations.
el13sr 4:0bd5c189f2f3 18 display.printString("Distance",18,1);
el13sr 4:0bd5c189f2f3 19 display.printString("Sensor",22,2);
el13sr 4:0bd5c189f2f3 20 display.printString("--++--++--++--",0,3);
el13sr 4:0bd5c189f2f3 21 display.printString("Sam Russell",10,4);
el13sr 4:0bd5c189f2f3 22 display.printString("--++--++--++--",0,5);
el13sr 12:babcce84f9c8 23 wait(4); //Delay between the introduction and the begining of the game.
el13sr 12:babcce84f9c8 24 display.clear(); //Clears the display.
el13sr 4:0bd5c189f2f3 25 }
el13sr 4:0bd5c189f2f3 26
el13sr 4:0bd5c189f2f3 27 void barChart()
el13sr 4:0bd5c189f2f3 28 {
el13sr 7:65bdd2d0d6ad 29 int buzz=0;
el13sr 12:babcce84f9c8 30 display.drawRect(0,0,82,20,0); //Draw initial bar graph border.
el13sr 7:65bdd2d0d6ad 31 if (distance>240) {
el13sr 12:babcce84f9c8 32 display.drawRect(72,2,8,16,1); //Draw 8 Bars
el13sr 12:babcce84f9c8 33 if(mode==0 && buzz==0) { //when mode is normal buzz is zero, play a note.
el13sr 12:babcce84f9c8 34 buzzer.period(1/349.23); //Plays note 'Fa'
el13sr 12:babcce84f9c8 35 buzz=1; //sets buzz to one, to prevent multiple notes playing.
el13sr 6:d6afc4026a1d 36 }
el13sr 7:65bdd2d0d6ad 37 }if(distance>210) {
el13sr 12:babcce84f9c8 38 display.drawRect(62,2,8,16,1); //Draw 7 Bars
el13sr 7:65bdd2d0d6ad 39 if(mode==0&&buzz==0) {
el13sr 12:babcce84f9c8 40 buzzer.period(1/329.63); //Plays note 'Mi'
el13sr 12:babcce84f9c8 41 buzz=1; //sets buzz to one, to prevent multiple notes playing.
el13sr 6:d6afc4026a1d 42 }
el13sr 7:65bdd2d0d6ad 43 }if(distance>180) {
el13sr 12:babcce84f9c8 44 display.drawRect(52,2,8,16,1); //Draw 6 Bars
el13sr 12:babcce84f9c8 45 if(mode==0 && buzz==0) { //when mode is normal buzz is zero, play a note.
el13sr 12:babcce84f9c8 46 buzzer.period(1/329.63); //Plays note 'Mi'
el13sr 12:babcce84f9c8 47 buzz=1; //sets buzz to one, to prevent multiple notes playing.
el13sr 6:d6afc4026a1d 48 }
el13sr 7:65bdd2d0d6ad 49 } if(distance>150) {
el13sr 12:babcce84f9c8 50 display.drawRect(42,2,8,16,1); //Draw 5 Bars
el13sr 12:babcce84f9c8 51 if(mode==0 && buzz==0) { //when mode is normal buzz is zero, play a note.
el13sr 12:babcce84f9c8 52 buzzer.period(1/293.66); //Plays note 'Re'
el13sr 12:babcce84f9c8 53 buzz=1; //sets buzz to one, to prevent multiple notes playing.
el13sr 6:d6afc4026a1d 54 }
el13sr 7:65bdd2d0d6ad 55 } if(distance>120) {
el13sr 12:babcce84f9c8 56 display.drawRect(32,2,8,16,1); //Draw 4 Bars
el13sr 12:babcce84f9c8 57 if(mode==0 && buzz==0) { //when mode is normal buzz is zero, play a note.
el13sr 12:babcce84f9c8 58 buzzer.period(1/293.66); //Plays note 'Re'
el13sr 12:babcce84f9c8 59 buzz=1; //sets buzz to one, to prevent multiple notes playing.
el13sr 6:d6afc4026a1d 60 }
el13sr 7:65bdd2d0d6ad 61 } if(distance>90) {
el13sr 12:babcce84f9c8 62 display.drawRect(22,2,8,16,1); //Draw 3 Bars
el13sr 12:babcce84f9c8 63 if(mode==0 && buzz==0) { //when mode is normal buzz is zero, play a note.
el13sr 12:babcce84f9c8 64 buzzer.period(1/261.63); //Plays note 'Do'
el13sr 12:babcce84f9c8 65 buzz=1; //sets buzz to one, to prevent multiple notes playing.
el13sr 6:d6afc4026a1d 66 }
el13sr 7:65bdd2d0d6ad 67 }if(distance>60) {
el13sr 12:babcce84f9c8 68 display.drawRect(12,2,8,16,1); //Draw 2 Bars
el13sr 12:babcce84f9c8 69 if(mode==0 && buzz==0) { //when mode is normal buzz is zero, play a note.
el13sr 12:babcce84f9c8 70 buzzer.period(1/261.63); //Plays note 'Do'
el13sr 12:babcce84f9c8 71 buzz=1; //sets buzz to one, to prevent multiple notes playing.
el13sr 6:d6afc4026a1d 72 }
el13sr 10:b61013738793 73 } if(distance>=30) {
el13sr 12:babcce84f9c8 74 display.drawRect(2,2,8,16,1); //Draw 1 Bar
el13sr 12:babcce84f9c8 75 if(mode==0 && buzz==0) { //when mode is normal buzz is zero, play a note.
el13sr 12:babcce84f9c8 76 buzzer.period(1/246.94); //Plays note 'Si'
el13sr 12:babcce84f9c8 77 buzz=1; //sets buzz to one, to prevent multiple notes playing.
el13sr 6:d6afc4026a1d 78 }
el13sr 7:65bdd2d0d6ad 79 }
el13sr 7:65bdd2d0d6ad 80 if(distance<30) {
el13sr 12:babcce84f9c8 81 if(mode==0 && buzz==0) { //when mode is normal buzz is zero, play a note.
el13sr 12:babcce84f9c8 82 buzzer.period(1/246.94); //Plays note 'Si'
el13sr 12:babcce84f9c8 83 buzz=1; //sets buzz to one, to prevent multiple notes playing.
el13sr 7:65bdd2d0d6ad 84 }
el13sr 7:65bdd2d0d6ad 85 }
el13sr 4:0bd5c189f2f3 86 }
el13sr 4:0bd5c189f2f3 87
el13sr 0:7d01de89a1ff 88 void error(int code)
el13sr 12:babcce84f9c8 89 //ERROR CODE
el13sr 0:7d01de89a1ff 90 {
el13sr 0:7d01de89a1ff 91 while(1) {
el13sr 0:7d01de89a1ff 92 leds = 0;
el13sr 0:7d01de89a1ff 93 wait(0.25);
el13sr 0:7d01de89a1ff 94 leds = code;
el13sr 0:7d01de89a1ff 95 wait(0.25);
el13sr 0:7d01de89a1ff 96 }
el13sr 0:7d01de89a1ff 97 }
el13sr 0:7d01de89a1ff 98
el13sr 1:387d5e6fa05f 99 void setTime()
el13sr 1:387d5e6fa05f 100 {
el13sr 12:babcce84f9c8 101 // print time for debugging
el13sr 1:387d5e6fa05f 102 pc.printf("set_time - %s",rxString);
el13sr 12:babcce84f9c8 103 // atoi() converts a string to an integer
el13sr 1:387d5e6fa05f 104 int time = atoi(rxString);
el13sr 12:babcce84f9c8 105 // update the time
el13sr 1:387d5e6fa05f 106 set_time(time);
el13sr 1:387d5e6fa05f 107 }
el13sr 1:387d5e6fa05f 108
el13sr 1:387d5e6fa05f 109 void serialISR()
el13sr 1:387d5e6fa05f 110 {
el13sr 12:babcce84f9c8 111 // when a serial interrupt occurs, read rx string into buffer
el13sr 1:387d5e6fa05f 112 pc.gets(rxString,16);
el13sr 12:babcce84f9c8 113 // set flag
el13sr 1:387d5e6fa05f 114 setTimeFlag = 1;
el13sr 1:387d5e6fa05f 115 }
el13sr 1:387d5e6fa05f 116
el13sr 3:4e8fb4fb54df 117 void writeDataToFile(char* data, int dataDistance)
el13sr 1:387d5e6fa05f 118 {
el13sr 11:41052065c916 119 if (mode<2){
el13sr 11:41052065c916 120 leds = 7; //logging indicator
el13sr 12:babcce84f9c8 121 logLED = 1; // turn on LEDs for feedback
el13sr 11:41052065c916 122 }
el13sr 12:babcce84f9c8 123 pc.printf("Data Logged\n"); //DEBUG MESSAGE
el13sr 12:babcce84f9c8 124 FILE *fp = fopen("/local/log.csv", "a"); // open 'log.txt' for appending
el13sr 12:babcce84f9c8 125 // if the file doesn't exist it is created, if it exists, data is appended to the end
el13sr 13:86520f8c3b72 126 fprintf(fp,"%s,%d\n",data,dataDistance); // print string to file
el13sr 12:babcce84f9c8 127 fclose(fp); // close file
el13sr 11:41052065c916 128 if (mode<2) {
el13sr 11:41052065c916 129 leds = 1;
el13sr 11:41052065c916 130 }
el13sr 1:387d5e6fa05f 131 }
el13sr 1:387d5e6fa05f 132
el13sr 12:babcce84f9c8 133 //When timer expires set flag to equal 1.
el13sr 1:387d5e6fa05f 134 void timerExpired()
el13sr 1:387d5e6fa05f 135 {
el13sr 1:387d5e6fa05f 136 timerflag = 1;
el13sr 1:387d5e6fa05f 137 }
el13sr 1:387d5e6fa05f 138
el13sr 0:7d01de89a1ff 139 float avgDist()
el13sr 12:babcce84f9c8 140 //After 10 readings calculate the average and define that as the total distance.
el13sr 0:7d01de89a1ff 141 {
el13sr 0:7d01de89a1ff 142 float d1 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 143 float d2 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 144 float d3 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 145 float d4 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 146 float d5 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 147 float d6 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 148 float d7 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 149 float d8 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 150 float d9 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 151 float d10 = SRF02.getDistanceCm();
el13sr 0:7d01de89a1ff 152 float distance = (d1+d2+d3+d4+d5+d6+d7+d8+d9+d10)/10;
el13sr 0:7d01de89a1ff 153 return distance;
el13sr 0:7d01de89a1ff 154 }
el13sr 0:7d01de89a1ff 155
el13sr 4:0bd5c189f2f3 156 void buttonPressed()
el13sr 4:0bd5c189f2f3 157 {
el13sr 5:c57cd4c57c40 158 wait(0.2);
el13sr 12:babcce84f9c8 159 mode++; //count up mode when button is pressed.
el13sr 11:41052065c916 160 leds = 15;
el13sr 4:0bd5c189f2f3 161 }
el13sr 4:0bd5c189f2f3 162
el13sr 1:387d5e6fa05f 163 int main()
el13sr 1:387d5e6fa05f 164 {
el13sr 12:babcce84f9c8 165 PHY_PowerDown(); ///1) Powers down the ethernet, function taken from the Ethernet Power Cotrnol library by Michael Wei.
el13sr 12:babcce84f9c8 166 pc.baud(9600); ///2) Sets the baud rate to 9600 (default)
el13sr 12:babcce84f9c8 167 timer.attach(&timerExpired,1); ///3) Configures & Initalises Timer
el13sr 12:babcce84f9c8 168 welcomeScreen(); ///4) Displays welcome screen.
el13sr 12:babcce84f9c8 169 pc.attach(&serialISR); ///5) Attaches PC so when an interupt occurs over the serial the function "serialISR" is executed.
el13sr 12:babcce84f9c8 170 char buffer[30]; ///6) Buffer created to store time string
el13sr 2:ebcfecb68cca 171
el13sr 12:babcce84f9c8 172 Button.rise(&buttonPressed); ///8) Configures & Initalises button pressed function.
el13sr 4:0bd5c189f2f3 173
el13sr 1:387d5e6fa05f 174 while(1) {
el13sr 12:babcce84f9c8 175 ///9) When timer expires and the timerflag boolean value is true, run the following.
el13sr 1:387d5e6fa05f 176 if(timerflag) {
el13sr 12:babcce84f9c8 177 leds = 1; ///10) sets LED indication.
el13sr 12:babcce84f9c8 178 timerflag = 0; ///11) Reset timer flag.
el13sr 12:babcce84f9c8 179 distance = avgDist(); ///12) Set the distance variable to the averaged value from the sensor.
el13sr 12:babcce84f9c8 180 time_t seconds = time(NULL); ///13) Get current time
el13sr 12:babcce84f9c8 181 strftime(buffer, 30 , "%R %d/%m/%y", localtime(&seconds)); ///14) Format time into a string (time and date)
el13sr 12:babcce84f9c8 182 pc.printf("%s , %d cm\n",buffer,distance); ///15) Print the distance value and the date/time to the serial.
el13sr 12:babcce84f9c8 183 display.clear(); ///16) Clear the display, updating bar graph.
el13sr 12:babcce84f9c8 184 ///17) Checks which mode the device is in and prints the mode name to the screen and executes the required actions of that mode.
el13sr 4:0bd5c189f2f3 185 if(mode==0) {
el13sr 12:babcce84f9c8 186 display.printString("Normal Mode",8,5); //Print mode name to screen.
el13sr 12:babcce84f9c8 187 buzzer =0.5; //turns buzzer on
el13sr 4:0bd5c189f2f3 188 } else if(mode==1) {
el13sr 12:babcce84f9c8 189 display.printString("Quiet Mode",10,5); //Print mode name to screen.
el13sr 12:babcce84f9c8 190 buzzer =0; //turns buzzer off
el13sr 4:0bd5c189f2f3 191 } else if(mode==2) {
el13sr 12:babcce84f9c8 192 display.printString("Power Saving",8,5); //Print mode name to screen.
el13sr 11:41052065c916 193 backlight = 0; //sets the backlight off
el13sr 12:babcce84f9c8 194 Sleep(); //mbed power saving sleep mode.
el13sr 12:babcce84f9c8 195 leds = 0; //led indication OFF
el13sr 5:c57cd4c57c40 196 } else if(mode==3) {
el13sr 12:babcce84f9c8 197 ///17b) when mode becomes an integer value of 3, reset mode and backlight.
el13sr 11:41052065c916 198 backlight =1; //sets the backlight on
el13sr 12:babcce84f9c8 199 mode=0; // resets mode flag.
el13sr 12:babcce84f9c8 200 leds = 0; //LED indication reset
el13sr 4:0bd5c189f2f3 201 }
el13sr 12:babcce84f9c8 202 char buffer2[50]; ///18) Buffer2 is used to store the distance string.
el13sr 12:babcce84f9c8 203 sprintf (buffer2, "%d cm", distance); ///19) Composes a printf compatable string and stores the distance in the buffer2.
el13sr 12:babcce84f9c8 204 display.printString(buffer2,25,3); ///20) Prints the string stored in buffer2
el13sr 12:babcce84f9c8 205 float L = Switch.read(); ///21) Checks switch value/position.
el13sr 1:387d5e6fa05f 206 if(L>0.9) {
el13sr 12:babcce84f9c8 207 ///22) When switch is on, save the data to file and turn indicator on.
el13sr 1:387d5e6fa05f 208 writeDataToFile(buffer,distance);
el13sr 12:babcce84f9c8 209 pc.printf("Logging Data\n"); //DEBUG MESSAGE
el13sr 2:ebcfecb68cca 210 } else {
el13sr 12:babcce84f9c8 211 ///22b) When switch is off, don't save the data to file and turn indictor off.
el13sr 2:ebcfecb68cca 212 logLED = 0;
el13sr 2:ebcfecb68cca 213 pc.printf("Not Logging Data\n");
el13sr 1:387d5e6fa05f 214 }
el13sr 12:babcce84f9c8 215 barChart(); ///23) Function which creates and updates the visual and audible indication of the distance.
el13sr 1:387d5e6fa05f 216 }
el13sr 12:babcce84f9c8 217 if (setTimeFlag) { ///24) If setTimeFlag is TRUE then set the time and reset the flag.
el13sr 12:babcce84f9c8 218 setTimeFlag = 0; // clear flag
el13sr 12:babcce84f9c8 219 setTime(); // update time
el13sr 1:387d5e6fa05f 220 }
el13sr 12:babcce84f9c8 221 sleep(); ///25) Return the mbed to power saving sleep mode.
el13sr 1:387d5e6fa05f 222 }
el13sr 1:387d5e6fa05f 223 }