amin omar
Coding for vehicle rear assistant
Fork of
Vehicle_Rear_Assistant
by 
amin omar
Vehicle Rear Assistant ELEC 2645 el14a2o
Revision 0:53f28990602d, committed 2015-05-08
- Comitter:
- aminomar
- Date:
- Fri May 08 21:54:44 2015 +0000
- Commit message:
- code finished;
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/LCD_DISPLAY.lib Fri May 08 21:54:44 2015 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/aminomar/code/LCD_DISPLAY/#0c85edd2dbd2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/PowerControl.lib Fri May 08 21:54:44 2015 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/aminomar/code/PowerControl/#6a9b3a48b23a
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SENSOR_SRF02.lib Fri May 08 21:54:44 2015 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/aminomar/code/SENSOR_SRF02/#688e41b7a3ea
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/beep.lib Fri May 08 21:54:44 2015 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/dreschpe/code/beep/#d8e14429a95f
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri May 08 21:54:44 2015 +0000
@@ -0,0 +1,42 @@
+/**
+@file main.cpp
+
+@brief Program implementation
+@brief Functions are called here when needed
+*/
+#include "main.h"
+ //main function
+int main()
+{
+ PHY_PowerDown(); //Ethernet Power Down
+ lcd.init(); // the LCD display is initiated first when switch is on
+ welcomeText();
+ lcd.clear();
+ button.rise(&buttonPressed); //event generated on rising edge
+
+ /// distance is measured in this loop
+ while (1) {
+ lcdBrightness = potBrightness; //to adjust brightness using potentiometer
+ getDistance();
+ readDistance();
+ lcd.clear();
+ /// buttonFlag is set back to 0
+ if (buttonFlag){ //if flag is set = 1
+
+ ///the value of displayReading is inverted
+ displayReading = ~displayReading; //if '~displayReading'(button is pushed again) value will not be dispayed
+ buttonFlag = 0; // reset button back to 0
+ }
+
+ ///if the condition is meet, value of distance will be displayed
+ if (displayReading){ //if 'displayReading'(button is pushed) value of distance is displayed
+ int distance=sensor.getDistanceCm();
+ char buffer[14];
+ int length = sprintf(buffer,"D= %d cm",distance);
+ if(length<=14)
+ lcd.printString(buffer,7,1);
+ lcd.drawRect(5,6,60,10,0); //lcd.drawRect(76(x),0(y),7(w),48(h),1(type))>>>>box for distance value
+ }
+ }
+}
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.h Fri May 08 21:54:44 2015 +0000
@@ -0,0 +1,254 @@
+/**
+@file main.h
+@brief Header file containing functions prototypes, defines and global variables.
+@brief The software of Vehicle Rear Assistant.
+@brief ELEC 2645
+@author Aminuddin Omar
+@date APRIL 2015
+*/
+
+#ifndef MAIN_H
+#define MAIN_H
+
+ //Declare libraries to be used
+#include "mbed.h"
+#include "PowerControl/PowerControl.h"
+#include "PowerControl/EthernetPowerControl.h"
+#include "N5110.h"
+#include "SRF02.h"
+#include "beep.h"
+
+/**
+@namespace lcd
+@brief GPIO pins for LCD display
+@namespace sensor
+@brief GPIO pins for SRF02
+@namespace buzzer
+@brief PWM pin for piezo buzzer
+@namespace danger
+@brief PWM pin for RED LED
+@namespace caution
+@brief PWM pin for YELLOW LED
+@namespace safe
+@brief PWM pin for GREEN LED
+@namespace lcdBrightness
+@brief PWM pin for LCD backlight
+@namespace potBrightness
+@brief AnalogIn pin for potentiometer
+@namespace button
+@brief InterruptIn pin for button
+*/
+N5110 lcd(p7,p8,p9,p10,p11,p13,p26); //(LCD_VCC, sce, rst, dc, mosi, sck, backlight)
+SRF02 sensor(p28, p27);
+Beep buzzer(p21);
+PwmOut danger(p24); //danger = red
+PwmOut caution(p23); //caution = yellow
+PwmOut safe(p22); //safe = green
+PwmOut lcdBrightness(p26); //lcd backlight (pin26)
+AnalogIn potBrightness(p20); //potentiometer (pin20)
+InterruptIn button(p17); //push button to display value of distance
+
+ //variables
+int distance; /*!< measure distance between car and object */
+int buttonFlag = 0; /*!< print flag set in ISR */
+int displayReading = 0; /*!< display the value of distance on LCD */
+
+ //Initialise all the functions
+
+/**
+Print welcome message when switch is turned on
+@param a - set number of letters that can be written including space
+@param message - Print HELLO
+@param rear - Print REAR
+@param assistant - Print ASSISTANT
+@param name - Print A.OMAR
+@param number - Print 200906568
+*/
+void welcomeText();
+
+/**
+Measure distance between car and objects
+@param distance - use SRF02 to measure distance
+*/
+void getDistance();
+
+/**
+Print "CAR" and a block on LCD according to distance measured
+@param lcd.drawRect - draw rectangle to represent object
+@param lcd.printString - draw "CAR" to represent car
+@param lcd.refresh() - refresh LCD display
+@param distanceSafe() - GREEN LED and buzzer is activated in safe mode
+@param distanceCaution() - YELLOW LED and buzzer is activated in caution mode
+@param distanceDanger() - RED LED and buzzer is activated in danger mode
+*/
+void readDistance();
+
+/**
+This function is called when in safe mode
+@param safe - only GREEN LED light up
+@brief buzzer is called and beep according to distance
+*/
+void distanceSafe();
+
+/**
+This function is called when in caution mode
+@param safe - only YELLOW LED light up
+@brief buzzer is called and beep according to distance
+*/
+void distanceCaution();
+
+/**
+This function is called when in danger mode
+@param safe - only RED LED light up
+@brief buzzer is called and beep according to distance
+*/
+void distanceDanger();
+
+/**
+This function is called when button is pressed
+@param buttonFlag - set the button flag to 1
+*/
+void buttonPressed();
+
+
+ //Print welcome message (letters are print one by one)
+void welcomeText()
+{
+ int a[9] = {12,18,24,30,36,42,48,54,60};
+ const char message[6] = {'H','E','L','L','O','!'};
+ char rear[4] = {'R','E','A','R'};
+ char assistant[9] = {'A','S','S','I','S','T','A','N','T'};
+ char name[6] = {'A','.','O','M','A','R'};
+ char number[9] = {'2','0','0','9','0','6','5','6','8'};
+ int i;
+ for(i=0; i<6; i++) {
+ lcd.printChar(message[i],a[i],0);
+ wait(0.05);
+ }
+ for(i=0; i<4; i++) {
+ lcd.printChar(rear[i],a[i],2);
+ wait(0.05);
+ }
+ for(i=0; i<9; i++) {
+ lcd.printChar(assistant[i],a[i],3);
+ wait(0.05);
+ }
+ for(i=0; i<6; i++) {
+ lcd.printChar(name[i],a[i],4);
+ wait(0.05);
+ }
+ for(i=0; i<9; i++) {
+ lcd.printChar(number[i],a[i],5);
+ wait(0.05);
+ }
+ lcd.refresh();
+ wait(2.5);
+}
+
+ //sensor is set to get the distance
+void getDistance()
+{
+ distance = sensor.getDistanceCm();
+}
+
+ //sensor read distance & lcd display 'CAR' and 'rectangle'
+void readDistance()
+{
+ if (distance >= 230)
+ {
+ lcd.drawRect(76,0,7,48,1); //WALL lcd.drawRect(76(x),0(y),7(w),48(h),1(type))
+ lcd.printString("CAR",5,3); //CAR
+ lcd.refresh();
+ distanceSafe();
+ }
+ else if (distance >= 190 & distance <= 229)
+ {
+ lcd.drawRect(76,0,7,48,1); //WALL
+ lcd.printString("CAR",15,3);//CAR
+ lcd.refresh();
+ distanceSafe();
+ }
+ else if (distance >= 150 & distance <= 189)
+ {
+ lcd.drawRect(76,0,7,48,1); //WALL
+ lcd.printString("CAR",25,3);//CAR
+ lcd.refresh();
+ distanceSafe();
+ }
+ else if (distance >= 120 & distance <= 149)
+ {
+ lcd.drawRect(76,0,7,48,1); //WALL
+ lcd.printString("CAR",30,3);//CAR
+ lcd.refresh();
+ distanceCaution();
+ }
+ else if (distance >= 100 & distance <= 119)
+ {
+ lcd.drawRect(76,0,7,48,1); //WALL
+ lcd.printString("CAR",39,3);//CAR
+ lcd.refresh();
+ distanceCaution();
+ }
+ else if (distance >= 70 & distance <= 99)
+ {
+ lcd.drawRect(76,0,7,48,1); //WALL
+ lcd.printString("CAR",48,3);//CAR
+ lcd.refresh();
+ distanceCaution();
+ }
+ else if (distance >= 45& distance <= 69)
+ {
+ lcd.drawRect(76,0,7,48,1); //WALL
+ lcd.printString("CAR",55,3);//CAR
+ lcd.refresh();
+ distanceDanger();
+ }
+ else if (distance <= 44)
+ {
+ lcd.printString("!!STOP!!",25,3);//print "STOP" only
+ lcd.refresh();
+ distanceDanger();
+ }
+}
+
+ //safe to reverse car
+void distanceSafe()
+{
+ danger = 0;
+ caution = 0;
+ safe = 1; //>>>>>>>>>safe = green led light up in safe mode
+ buzzer.beep(1000,1);
+ wait(1);
+ buzzer.nobeep();
+}
+
+ //caution : reverse car carefuly
+void distanceCaution()
+{
+ danger = 0;
+ caution = 1; //>>>>>>caution = yellow led light up in caution mode
+ safe = 0;
+ buzzer.beep(1000,1);
+ wait(0.4);
+ buzzer.nobeep();
+}
+
+ //danger : stop reverse car
+void distanceDanger()
+{
+ danger = 1; //>>>>>>>danger = red led light up in danger mode
+ caution = 0;
+ safe = 0;
+ buzzer.beep(1000,1);
+ wait(0.2);
+ buzzer.nobeep();
+}
+
+
+ //INTERRUPT SERVICE ROUTINE
+void buttonPressed()
+{
+ buttonFlag = 1; //set flag
+}
+
+#endif
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri May 08 21:54:44 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/433970e64889 \ No newline at end of file
Binary file mbedmicrocontroller_experimentalpowerdown (1).if has changed