Mohammed Al Mahrouqi / Mbed 2 deprecated My_Ultrasonic_sensor

My final code

Dependencies:   N5110 PowerControl SRF02 mbed

My_Ultrasonic_sensor.cpp@1:3a729bf4a055, 2015-05-11 (annotated)

Committer:
msa1992
Date:
Mon May 11 22:47:07 2015 +0000
Revision:
1:3a729bf4a055
Parent:
0:4de98c636e60 
Final Code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
msa1992 0:4de98c636e60 1 /**
msa1992 0:4de98c636e60 2 @file My_Ultrasonic_sensor.cpp
msa1992 0:4de98c636e60 3 @brief Header file containing functions prototypes, defines and global variables.
msa1992 0:4de98c636e60 4 @brief Doxygen documentation.
msa1992 0:4de98c636e60 5 @brief Revision 1.0.
msa1992 0:4de98c636e60 6 @author Mohammed Al Mahrouqi
msa1992 0:4de98c636e60 7 @date 1 May 2015
msa1992 0:4de98c636e60 8 */
msa1992 0:4de98c636e60 9
msa1992 0:4de98c636e60 10 /// import "mbed.h" library to the code
msa1992 0:4de98c636e60 11 #include "mbed.h"
msa1992 0:4de98c636e60 12 /// import "N5110.h" library to the code
msa1992 0:4de98c636e60 13 #include "N5110.h"
msa1992 0:4de98c636e60 14 /// import "SRF02.h" library to the code
msa1992 0:4de98c636e60 15 #include "SRF02.h"
msa1992 0:4de98c636e60 16 /// import "PowerControl/PowerControl.h" library to the code
msa1992 0:4de98c636e60 17 #include "PowerControl/PowerControl.h"
msa1992 0:4de98c636e60 18 /// import "PowerControl/EthernetPowerControl.h" library to the code
msa1992 0:4de98c636e60 19 #include "PowerControl/EthernetPowerControl.h"
msa1992 0:4de98c636e60 20
msa1992 0:4de98c636e60 21 /// power down USB interface
msa1992 0:4de98c636e60 22 #define USR_POWERDOWN (0x104)
msa1992 0:4de98c636e60 23
msa1992 0:4de98c636e60 24
msa1992 0:4de98c636e60 25 // VCC,SCE,RST,D/C,MOSI,SCLK,LED
msa1992 0:4de98c636e60 26 ///N5110 lcd object defined
msa1992 0:4de98c636e60 27 N5110 lcd(p7,p8,p9,p10,p11,p13,p26);
msa1992 0:4de98c636e60 28 // Can also power (VCC) directly from VOUT (3.3 V) -
msa1992 0:4de98c636e60 29 // Can give better performance due to current limitation from GPIO pin
msa1992 0:4de98c636e60 30 /// PWM pin for buzzer output
msa1992 0:4de98c636e60 31 PwmOut buzzer(p21);
msa1992 0:4de98c636e60 32 /// SRF02 sensor pins
msa1992 0:4de98c636e60 33 SRF02 sensor(p28,p27);
msa1992 0:4de98c636e60 34 /// PWM pin for LED
msa1992 0:4de98c636e60 35 PwmOut led(p24);
msa1992 0:4de98c636e60 36 /// AnalogIn pin for pot output
msa1992 0:4de98c636e60 37 AnalogIn Pot(p20);
msa1992 0:4de98c636e60 38 /// InterruptIn pin for button
msa1992 0:4de98c636e60 39 InterruptIn button(p16);
msa1992 0:4de98c636e60 40
msa1992 0:4de98c636e60 41
msa1992 0:4de98c636e60 42 /// a Ticker variable is created. used to get quicker reading response
msa1992 0:4de98c636e60 43 Ticker timer;
msa1992 0:4de98c636e60 44
msa1992 0:4de98c636e60 45 /// a float variable is created and called meterDistance
msa1992 0:4de98c636e60 46 float metreDistance;
msa1992 0:4de98c636e60 47
msa1992 0:4de98c636e60 48 int timerFlag1 = 0; //flag for timer
msa1992 0:4de98c636e60 49
msa1992 0:4de98c636e60 50 ///Interrupt Service Routine
msa1992 0:4de98c636e60 51 void timerExpired()
msa1992 0:4de98c636e60 52 {
msa1992 0:4de98c636e60 53 /// set timerFlag1 = 1
msa1992 0:4de98c636e60 54 timerFlag1 = 1; //set flag
msa1992 0:4de98c636e60 55 }
msa1992 0:4de98c636e60 56 /// Power down the USB interface
msa1992 0:4de98c636e60 57 int semihost_powerdown()
msa1992 0:4de98c636e60 58 {
msa1992 0:4de98c636e60 59 uint32_t arg;
msa1992 0:4de98c636e60 60 return __semihost(USR_POWERDOWN, &arg);
msa1992 0:4de98c636e60 61
msa1992 0:4de98c636e60 62 }
msa1992 0:4de98c636e60 63 ///draw rocket
msa1992 0:4de98c636e60 64 ///@param int x to set a pixel in x-axis of the display
msa1992 0:4de98c636e60 65 ///@param int y to set a pixel in y-axis of the display
msa1992 0:4de98c636e60 66 void rocketDraw(int x, int y)
msa1992 0:4de98c636e60 67 {
msa1992 0:4de98c636e60 68 lcd.setPixel(42+x,27+y);
msa1992 0:4de98c636e60 69
msa1992 0:4de98c636e60 70 lcd.setPixel(41+x,28+y);
msa1992 0:4de98c636e60 71 lcd.setPixel(40+x,29+y);
msa1992 0:4de98c636e60 72
msa1992 0:4de98c636e60 73 lcd.setPixel(42+x,28+y);
msa1992 0:4de98c636e60 74
msa1992 0:4de98c636e60 75 lcd.setPixel(43+x,28+y);
msa1992 0:4de98c636e60 76 lcd.setPixel(44+x,29+y);
msa1992 0:4de98c636e60 77
msa1992 0:4de98c636e60 78 lcd.setPixel(41+x,29+y);
msa1992 0:4de98c636e60 79 lcd.setPixel(42+x,29+y);
msa1992 0:4de98c636e60 80 lcd.setPixel(43+x,29+y);
msa1992 0:4de98c636e60 81
msa1992 0:4de98c636e60 82 lcd.setPixel(40+x,30+y);
msa1992 0:4de98c636e60 83 lcd.setPixel(40+x,31+y);
msa1992 0:4de98c636e60 84 lcd.setPixel(40+x,32+y);
msa1992 0:4de98c636e60 85 lcd.setPixel(40+x,33+y);
msa1992 0:4de98c636e60 86 lcd.setPixel(40+x,34+y);
msa1992 0:4de98c636e60 87 lcd.setPixel(40+x,35+y);
msa1992 0:4de98c636e60 88
msa1992 0:4de98c636e60 89 lcd.setPixel(41+x,30+y);
msa1992 0:4de98c636e60 90 lcd.setPixel(41+x,31+y);
msa1992 0:4de98c636e60 91 lcd.setPixel(41+x,32+y);
msa1992 0:4de98c636e60 92 lcd.setPixel(41+x,33+y);
msa1992 0:4de98c636e60 93 lcd.setPixel(41+x,34+y);
msa1992 0:4de98c636e60 94 lcd.setPixel(41+x,35+y);
msa1992 0:4de98c636e60 95
msa1992 0:4de98c636e60 96 lcd.setPixel(42+x,30+y);
msa1992 0:4de98c636e60 97 lcd.setPixel(42+x,31+y);
msa1992 0:4de98c636e60 98 lcd.setPixel(42+x,32+y);
msa1992 0:4de98c636e60 99 lcd.setPixel(42+x,33+y);
msa1992 0:4de98c636e60 100 lcd.setPixel(42+x,34+y);
msa1992 0:4de98c636e60 101 lcd.setPixel(42+x,35+y);
msa1992 0:4de98c636e60 102
msa1992 0:4de98c636e60 103 lcd.setPixel(43+x,30+y);
msa1992 0:4de98c636e60 104 lcd.setPixel(43+x,31+y);
msa1992 0:4de98c636e60 105 lcd.setPixel(43+x,32+y);
msa1992 0:4de98c636e60 106 lcd.setPixel(43+x,33+y);
msa1992 0:4de98c636e60 107 lcd.setPixel(43+x,34+y);
msa1992 0:4de98c636e60 108 lcd.setPixel(43+x,35+y);
msa1992 0:4de98c636e60 109
msa1992 0:4de98c636e60 110 lcd.setPixel(44+x,30+y);
msa1992 0:4de98c636e60 111 lcd.setPixel(44+x,31+y);
msa1992 0:4de98c636e60 112 lcd.setPixel(44+x,32+y);
msa1992 0:4de98c636e60 113 lcd.setPixel(44+x,33+y);
msa1992 0:4de98c636e60 114 lcd.setPixel(44+x,34+y);
msa1992 0:4de98c636e60 115 lcd.setPixel(44+x,35+y);
msa1992 0:4de98c636e60 116
msa1992 0:4de98c636e60 117 lcd.setPixel(45+x,36+y);
msa1992 0:4de98c636e60 118 lcd.setPixel(46+x,37+y);
msa1992 0:4de98c636e60 119 lcd.setPixel(47+x,38+y);
msa1992 0:4de98c636e60 120
msa1992 0:4de98c636e60 121 lcd.setPixel(39+x,36+y);
msa1992 0:4de98c636e60 122 lcd.setPixel(38+x,37+y);
msa1992 0:4de98c636e60 123 lcd.setPixel(37+x,38+y);
msa1992 0:4de98c636e60 124
msa1992 0:4de98c636e60 125 lcd.setPixel(42+x,36+y);
msa1992 0:4de98c636e60 126 lcd.setPixel(42+x,37+y);
msa1992 0:4de98c636e60 127 lcd.setPixel(42+x,38+y);
msa1992 0:4de98c636e60 128 }
msa1992 0:4de98c636e60 129 /// set buttonFlag = 0
msa1992 0:4de98c636e60 130 int buttonFlag = 0;
msa1992 0:4de98c636e60 131
msa1992 0:4de98c636e60 132 /// void function is used to initilize the button
msa1992 0:4de98c636e60 133 void buttonPressed()
msa1992 0:4de98c636e60 134 {
msa1992 0:4de98c636e60 135 /// Once button pressed, measuring unit changes
msa1992 0:4de98c636e60 136 buttonFlag = !buttonFlag;
msa1992 0:4de98c636e60 137 }
msa1992 0:4de98c636e60 138
msa1992 0:4de98c636e60 139
msa1992 0:4de98c636e60 140 /// initilize main function
msa1992 0:4de98c636e60 141 int main()
msa1992 0:4de98c636e60 142 {
msa1992 0:4de98c636e60 143
msa1992 0:4de98c636e60 144
msa1992 0:4de98c636e60 145
msa1992 0:4de98c636e60 146
msa1992 0:4de98c636e60 147 /// Pulldown is used to keep constant and only changes if button pressed
msa1992 0:4de98c636e60 148 button.mode(PullDown);
msa1992 0:4de98c636e60 149 /// This to allow unit changes if button pressed
msa1992 0:4de98c636e60 150 button.rise(&buttonPressed);
msa1992 0:4de98c636e60 151 /// call ISR every 1.0 seconds
msa1992 0:4de98c636e60 152 timer.attach(&timerExpired,0.1); //call ISR every 1.0 seconds
msa1992 0:4de98c636e60 153
msa1992 0:4de98c636e60 154
msa1992 0:4de98c636e60 155 /// Powering down the Ethernet interface
msa1992 0:4de98c636e60 156 int result = semihost_powerdown();
msa1992 0:4de98c636e60 157 PHY_PowerDown();
msa1992 0:4de98c636e60 158
msa1992 0:4de98c636e60 159 /// initialise display
msa1992 0:4de98c636e60 160 lcd.init();
msa1992 0:4de98c636e60 161 /// print this "text" in pixels coordinates (x,y)
msa1992 0:4de98c636e60 162 lcd.printString("Mini radar",15,0);
msa1992 0:4de98c636e60 163 /// wait (# seconds) till next function
msa1992 0:4de98c636e60 164 wait(1);
msa1992 0:4de98c636e60 165 /// print this "text" in pixels coordinates (x,y)
msa1992 0:4de98c636e60 166 lcd.printString("Done By:",20,1);
msa1992 0:4de98c636e60 167 /// wait (# seconds) till next function
msa1992 0:4de98c636e60 168 wait(1);
msa1992 0:4de98c636e60 169 /// print this "text" in pixels coordinates (x,y)
msa1992 0:4de98c636e60 170 lcd.printString("Mohammed",18,2);
msa1992 0:4de98c636e60 171 /// wait (# seconds) till next function
msa1992 0:4de98c636e60 172 wait(1);
msa1992 0:4de98c636e60 173 /// print this "text" in pixels coordinates (x,y)
msa1992 0:4de98c636e60 174 lcd.printString("Al Mahrouqi",10,3);
msa1992 0:4de98c636e60 175 /// wait (# seconds) till next function
msa1992 0:4de98c636e60 176 wait(1);
msa1992 0:4de98c636e60 177 /// print this "text" in pixels coordinates (x,y)
msa1992 0:4de98c636e60 178 lcd.printString("200823396",18,4);
msa1992 0:4de98c636e60 179 /// wait (# seconds) till next function
msa1992 0:4de98c636e60 180 wait(1);
msa1992 0:4de98c636e60 181 /// referesh the LCD display
msa1992 0:4de98c636e60 182 lcd.refresh();
msa1992 0:4de98c636e60 183 /// clear the display
msa1992 0:4de98c636e60 184 lcd.clear();
msa1992 0:4de98c636e60 185
msa1992 0:4de98c636e60 186
msa1992 0:4de98c636e60 187 /// create a while loop
msa1992 0:4de98c636e60 188 while(1) {
msa1992 0:4de98c636e60 189
msa1992 0:4de98c636e60 190
msa1992 0:4de98c636e60 191
msa1992 0:4de98c636e60 192
msa1992 0:4de98c636e60 193 /// create if function for timerFlag1. Flag is set
msa1992 0:4de98c636e60 194 if (timerFlag1) {
msa1992 0:4de98c636e60 195 ///Reset flag1
msa1992 0:4de98c636e60 196 timerFlag1 = 0;
msa1992 0:4de98c636e60 197
msa1992 0:4de98c636e60 198 }
msa1992 0:4de98c636e60 199
msa1992 0:4de98c636e60 200
msa1992 0:4de98c636e60 201
msa1992 0:4de98c636e60 202
msa1992 0:4de98c636e60 203
msa1992 0:4de98c636e60 204 ///read sensor distance in cm and print over serial port
msa1992 0:4de98c636e60 205 int distance = sensor.getDistanceCm();
msa1992 0:4de98c636e60 206 //serial.printf("Distance = %d cm\n",distance);
msa1992 0:4de98c636e60 207 // short delay before next measurement
msa1992 0:4de98c636e60 208
msa1992 0:4de98c636e60 209
msa1992 0:4de98c636e60 210 /// each character is 6 pixels wide, screen is 84 pixels
msa1992 0:4de98c636e60 211 char buffer[14];
msa1992 0:4de98c636e60 212 // so can display a string of a maximum 14 characters in length
msa1992 0:4de98c636e60 213 // or create formatted strings - ensure they aren't more than 14 characters long
msa1992 0:4de98c636e60 214
msa1992 0:4de98c636e60 215 /// create float variable called distance
msa1992 0:4de98c636e60 216 float distanceFloat = distance;
msa1992 0:4de98c636e60 217 /// convert ditance from cm to m
msa1992 0:4de98c636e60 218 metreDistance = distanceFloat / 100;
msa1992 0:4de98c636e60 219
msa1992 0:4de98c636e60 220 /// set button flag
msa1992 0:4de98c636e60 221 if(buttonFlag) {
msa1992 0:4de98c636e60 222
msa1992 0:4de98c636e60 223 /// print formatted data to buffer
msa1992 0:4de98c636e60 224 int length = sprintf(buffer,"Dist = %.2f m",metreDistance);
msa1992 0:4de98c636e60 225
msa1992 0:4de98c636e60 226 /// if string will fit on display
msa1992 0:4de98c636e60 227 if (length >= 14) {
msa1992 0:4de98c636e60 228 /// display on screen
msa1992 0:4de98c636e60 229 lcd.printString(buffer,0,0);
msa1992 0:4de98c636e60 230 }
msa1992 0:4de98c636e60 231 /// refresh screen
msa1992 0:4de98c636e60 232 lcd.refresh();
msa1992 0:4de98c636e60 233
msa1992 0:4de98c636e60 234 /// if flag is = 0, print distance in cm
msa1992 0:4de98c636e60 235 } else if(buttonFlag == 0) {
msa1992 0:4de98c636e60 236 /// print distance in cm
msa1992 0:4de98c636e60 237 int length = sprintf(buffer,"Dist = %2d Cm",distance);
msa1992 0:4de98c636e60 238
msa1992 0:4de98c636e60 239 /// if string will fit on display
msa1992 0:4de98c636e60 240 if (length <= 14) {
msa1992 0:4de98c636e60 241 /// display on screen
msa1992 0:4de98c636e60 242 lcd.printString(buffer,0,0);
msa1992 0:4de98c636e60 243 }
msa1992 0:4de98c636e60 244 /// referesh LCD screen
msa1992 0:4de98c636e60 245 lcd.refresh();
msa1992 0:4de98c636e60 246 }
msa1992 0:4de98c636e60 247
msa1992 0:4de98c636e60 248
msa1992 0:4de98c636e60 249
msa1992 0:4de98c636e60 250
msa1992 0:4de98c636e60 251
msa1992 0:4de98c636e60 252
msa1992 0:4de98c636e60 253 /// if ditance is less than 50, set buzzer = 1.0
msa1992 0:4de98c636e60 254 if(distance < 50) {
msa1992 0:4de98c636e60 255 buzzer = 1.0;
msa1992 0:4de98c636e60 256 buzzer.period_ms(2);
msa1992 0:4de98c636e60 257 wait_ms((distance)+0.0001);
msa1992 0:4de98c636e60 258 buzzer = 0.5;
msa1992 0:4de98c636e60 259 }
msa1992 0:4de98c636e60 260 /// if distance is greater than 50, set buzzer = 0.0
msa1992 0:4de98c636e60 261 else {
msa1992 0:4de98c636e60 262 buzzer = 0.0;
msa1992 0:4de98c636e60 263
msa1992 0:4de98c636e60 264 }
msa1992 0:4de98c636e60 265 /// if the condition is valid, print distance in cm
msa1992 0:4de98c636e60 266 if(distance > 50 && buttonFlag == 1) {
msa1992 0:4de98c636e60 267 lcd.clear();
msa1992 0:4de98c636e60 268 lcd.printString("Safe",30,2);
msa1992 0:4de98c636e60 269 int length = sprintf(buffer,"Dist = %2d Cm",distance); // print formatted data to buffer
msa1992 0:4de98c636e60 270 // it is important the format specifier ensures the length will fit in the buffer
msa1992 0:4de98c636e60 271
msa1992 0:4de98c636e60 272 if (length <= 14) // if string will fit on display
msa1992 0:4de98c636e60 273 lcd.printString(buffer,0,0); // display on screen
msa1992 0:4de98c636e60 274 lcd.refresh();
msa1992 0:4de98c636e60 275 }
msa1992 0:4de98c636e60 276 /// if the condition is NOT valid, print distance in m
msa1992 0:4de98c636e60 277 else if(distance > 50 && buttonFlag == 0) {
msa1992 0:4de98c636e60 278 lcd.clear();
msa1992 0:4de98c636e60 279 lcd.printString("Safe",30,2);
msa1992 0:4de98c636e60 280 int length = sprintf(buffer,"Dist = %.2f m",metreDistance); // print formatted data to buffer
msa1992 0:4de98c636e60 281 // it is important the format specifier ensures the length will fit in the buffer
msa1992 0:4de98c636e60 282
msa1992 0:4de98c636e60 283 if (length <= 14) // if string will fit on display
msa1992 0:4de98c636e60 284 lcd.printString(buffer,0,0); // display on screen
msa1992 0:4de98c636e60 285 lcd.refresh();
msa1992 0:4de98c636e60 286 }
msa1992 0:4de98c636e60 287
msa1992 0:4de98c636e60 288
msa1992 0:4de98c636e60 289
msa1992 0:4de98c636e60 290
msa1992 0:4de98c636e60 291
msa1992 0:4de98c636e60 292 /// if condition is valid, print "Warning, Defense System On"
msa1992 0:4de98c636e60 293 else if(distance > 20 & distance < 50) {
msa1992 0:4de98c636e60 294 lcd.clear();
msa1992 0:4de98c636e60 295 lcd.printString("Warning",20,2);
msa1992 0:4de98c636e60 296 lcd.printString("Defence",20,4);
msa1992 0:4de98c636e60 297 lcd.printString("System On",15,5);
msa1992 0:4de98c636e60 298
msa1992 0:4de98c636e60 299 /// if buttonFlag=0, print distance in cm
msa1992 0:4de98c636e60 300 if(buttonFlag == 0) { //if button is in the unpressed state, print distance in cm
msa1992 0:4de98c636e60 301 int length = sprintf(buffer,"Dist = %2d Cm",distance); // print formatted data to buffer
msa1992 0:4de98c636e60 302 // it is important the format specifier ensures the length will fit in the buffer
msa1992 0:4de98c636e60 303
msa1992 0:4de98c636e60 304 if (length <= 14) // if string will fit on display
msa1992 0:4de98c636e60 305 lcd.printString(buffer,0,0); // display on screen
msa1992 0:4de98c636e60 306 lcd.refresh();
msa1992 0:4de98c636e60 307 }
msa1992 0:4de98c636e60 308 /// if buttonFlag = 1, print distance in m
msa1992 0:4de98c636e60 309 else if(buttonFlag == 1) { //print distance in metres if button pressed
msa1992 0:4de98c636e60 310 int length = sprintf(buffer,"Dist = %.2f m",metreDistance); // print formatted data to buffer
msa1992 0:4de98c636e60 311 // it is important the format specifier ensures the length will fit in the buffer
msa1992 0:4de98c636e60 312
msa1992 0:4de98c636e60 313 if (length <= 14) // if string will fit on display
msa1992 0:4de98c636e60 314 lcd.printString(buffer,0,0); // display on screen
msa1992 0:4de98c636e60 315 lcd.refresh();
msa1992 0:4de98c636e60 316 }
msa1992 0:4de98c636e60 317 }
msa1992 0:4de98c636e60 318
msa1992 0:4de98c636e60 319
msa1992 0:4de98c636e60 320
msa1992 0:4de98c636e60 321
msa1992 0:4de98c636e60 322
msa1992 0:4de98c636e60 323
msa1992 0:4de98c636e60 324
msa1992 0:4de98c636e60 325
msa1992 0:4de98c636e60 326 /// if all if functions Not valid, else will print "Fire" and draw "missile"
msa1992 0:4de98c636e60 327 else {
msa1992 0:4de98c636e60 328 lcd.clear();
msa1992 0:4de98c636e60 329 lcd.printString("Fire",30,2);
msa1992 0:4de98c636e60 330 rocketDraw(0,0);
msa1992 0:4de98c636e60 331
msa1992 0:4de98c636e60 332 /// if buttonFlag=0, print distance in cm
msa1992 0:4de98c636e60 333 if(buttonFlag == 0) { //if button is in the unpressed state, print distance in cm
msa1992 0:4de98c636e60 334 int length = sprintf(buffer,"Dist = %2d Cm",distance); // print formatted data to buffer
msa1992 0:4de98c636e60 335 // it is important the format specifier ensures the length will fit in the buffer
msa1992 0:4de98c636e60 336
msa1992 0:4de98c636e60 337 if (length <= 14) // if string will fit on display
msa1992 0:4de98c636e60 338 lcd.printString(buffer,0,0); // display on screen
msa1992 0:4de98c636e60 339 lcd.refresh();
msa1992 0:4de98c636e60 340 }
msa1992 0:4de98c636e60 341 /// if buttonFlag = 1, print distance in m
msa1992 0:4de98c636e60 342 else if(buttonFlag == 1) { //print distance in metres if button pressed
msa1992 0:4de98c636e60 343 int length = sprintf(buffer,"Dist = %.2f m",metreDistance); // print formatted data to buffer
msa1992 0:4de98c636e60 344 // it is important the format specifier ensures the length will fit in the buffer
msa1992 0:4de98c636e60 345
msa1992 0:4de98c636e60 346 if (length <= 14) // if string will fit on display
msa1992 0:4de98c636e60 347 lcd.printString(buffer,0,0); // display on screen
msa1992 0:4de98c636e60 348 lcd.refresh();
msa1992 0:4de98c636e60 349 }
msa1992 0:4de98c636e60 350 }
msa1992 0:4de98c636e60 351 /// if distance is less than 50, switch on LED
msa1992 0:4de98c636e60 352 if(distance < 50) {
msa1992 0:4de98c636e60 353 led = 2.0;
msa1992 0:4de98c636e60 354 /// if NOT, keep LED off
msa1992 0:4de98c636e60 355 } else {
msa1992 0:4de98c636e60 356 led = 0.0;
msa1992 0:4de98c636e60 357
msa1992 0:4de98c636e60 358 }
msa1992 0:4de98c636e60 359
msa1992 0:4de98c636e60 360
msa1992 0:4de98c636e60 361
msa1992 0:4de98c636e60 362
msa1992 0:4de98c636e60 363
msa1992 0:4de98c636e60 364 /// referesh the screen
msa1992 0:4de98c636e60 365 lcd.refresh();
msa1992 0:4de98c636e60 366 /// set brightness to be controlled by the potentiometer
msa1992 0:4de98c636e60 367 lcd.setBrightness(Pot.read());
msa1992 0:4de98c636e60 368 /// wait for 0.5 seconds
msa1992 0:4de98c636e60 369 wait(0.5);
msa1992 0:4de98c636e60 370
msa1992 0:4de98c636e60 371 }
msa1992 0:4de98c636e60 372 }