/*this code is of rotary car paring system which works like this
if user press 1 then code will find empty space and every platform slot
has give specifed angle and motor will check free space and stop and
that desired angle
if user press 2 to unpark then rfid code willl work every platform has
attach rfid under it and user will enter platform which it want to bring down.
code will check rfid id if id not match then move to next platform there it
check id if not match then moveto next patform if id match then motor will
stop there and it mark platform as occupied */
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <MFRC522.h>
#include <Servo.h>
#include <Keypad.h>
#define TRIG_PIN 9
#define ECHO_PIN 10
#define SERVO_PIN 6
#define SS_PIN 9
#define RST_PIN 8
LiquidCrystal_I2C lcd(0x27, 16, 2);
MFRC522 rfid(SS_PIN, RST_PIN);
Servo platformServo;
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {A0, A1, A2, A3};
byte colPins[COLS] = {2, 3, 4, 5};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
String platformIDs[] = {"B3 00 E0 0D", "ID2", "ID3", "ID4"};
bool platformStatus[] = {true, true, true, true};
void setup()
{
Serial.begin(9600);
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print("Welcome to");
lcd.setCursor(0, 1);
lcd.print("Car Parking Sys");
delay(2000);
lcd.clear();
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
platformServo.attach(SERVO_PIN);
SPI.begin();
rfid.PCD_Init();
}
void loop()
{
lcd.print("Press 1 to park");
lcd.setCursor(0, 1);
lcd.print("Press 2 to unpark");
char key = getKey();
if (key == '1')
{
int emptyPlatform = findEmptyPlatform();
if (emptyPlatform != -1)
{
lcd.clear();
lcd.print("Parking...");
delay(2000);
lcd.clear();
movePlatform(emptyPlatform);
platformStatus[emptyPlatform] = false; // Mark platform as occupied
delay(2000);
}
else
{
lcd.clear();
lcd.print("No empty space");
delay(2000);
lcd.clear();
}
}
else if (key == '2')
{
lcd.clear();
lcd.print("Enter platform (1-4)");
char platformKey;
do {
platformKey = getKey(); // Wait for the user to enter a key
} while (platformKey == '\0'); // Keep waiting until a valid key is pressed
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Platform Key: ");
lcd.setCursor(0, 1);
lcd.print(platformKey);
delay(3000);
lcd.clear();
int platformIndex = platformKey - '0' - 1;
if (platformIndex >= 0 && platformIndex < 4)
{
lcd.print("Checking RFID...");
delay(2000);
lcd.clear();
bool cardFound = false;
int platformCounter = 0; // Initialize platform counter
while (!cardFound && platformCounter < 4) // Continue until card is found or all platforms are checked
{
if (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial()) {
String rfidCardID = readRFID();
Serial.println("expected id");
Serial.print(platformIDs[platformIndex]);
Serial.println("rfid id id");
Serial.print(rfidCardID);
if (rfidCardID == platformIDs[platformIndex]) {
lcd.print("Match! Motor stopped");
delay(2000);
lcd.clear();
movePlatform(platformIndex); // Park the platform
cardFound = true;
break;
}
}
platformIndex = (platformIndex + 1) % 4; // Move to the next platform
platformCounter++; // Increment platform counter
}
if (!cardFound) {
lcd.print("RFID not matched. Moving motor...");
movePlatform(platformIndex); // Move to the next platform
delay(2000);
lcd.clear();
lcd.print("Invalid card");
delay(2000);
lcd.clear();
}
}
else
{
lcd.print("Invalid platform");
delay(2000);
lcd.clear();
}
}
}
char getKey()
{
char key = keypad.getKey();
return key;
}
int findEmptyPlatform()
{
for (int i = 0; i < 4; i++)
{
if (platformStatus[i])
{
return i;
}
}
return -1;
}
String readRFID()
{
if (rfid.PICC_IsNewCardPresent() && rfid.PICC_ReadCardSerial())
{
String rfidCardID = "";
for (byte i = 0; i < rfid.uid.size; i++)
{
rfidCardID.concat(String(rfid.uid.uidByte[i] < 0x10 ? "0" : ""));
rfidCardID.concat(String(rfid.uid.uidByte[i], HEX));
}
rfid.PICC_HaltA();
return rfidCardID;
}
return "";
}
void movePlatform(int platformIndex)
{
// Define the angles for each platform
int platformAngles[] = {0, 60, 120, 180};
if (!platformStatus[platformIndex]) {
// If platform is occupied, stop at the corresponding angle
platformServo.write(platformAngles[platformIndex]);
} else {
// If platform is empty, move to the specified angle
platformServo.write(platformAngles[platformIndex]);
// Optionally, add a delay to hold the position for some time
delay(1000); // Adjust the delay as needed
// After the delay, stop the motor by writing to a neutral angle (e.g., 90 degrees)
platformServo.write(90); // Neutral position
}
}
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1 Like
And what grade will your teacher give for the forum?
If you check you will find some of your classmates have already posted this question. What course is it for?
Electrical
University, high school, grade school, course # if applicable.
which communication protocol you are using ?
I am having same problem. Try DumpInfo
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