deleted 26 characters in body; edited title

Source Link

edited Jan 8, 2018 at 7:35

dda

1.6k
1
12
18

Why doesdoesn't my 1602a1602A LCD not display text with this code?

#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>
#include <Servo.h>

#define RST_PIN 9 // Configurable, see typical pin layout above
#define SS_PIN 10 // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Servo myservo; // create servo object to control a servo

String read_rfid;
String ok_rfid_1 = "6722323b";
String ok_rfid_2 = "99be859e";
int posClosed = 180; // variable to store the servo position for locked
int posOpen = 0; //same for open...

/*
  Initialize.
*/
void setup() {
  Serial.begin(9600); // Initialize serial communications with the PC
  while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
  SPI.begin(); // Init SPI bus
  mfrc522.PCD_Init(); // Init MFRC522 card
  lcd.begin(16, 2);
  lcd.clear();
  lcd.print("Scan your card:");
  Serial.println("Scan your card:");
  //Choose which lock below:
  myservo.attach(7); // attaches the servo on pin 7 to the servo object
}

/*
  Helper routine to dump a byte array as hex values to Serial.
*/
void dump_byte_array(byte *buffer, byte bufferSize) {
  read_rfid = "";
  for (byte i = 0; i < bufferSize; i++) {
    read_rfid = read_rfid + String(buffer[i], HEX);
  }
}

void open_lock() {
  //Use this routine when working with Servos.
  //lcd.clear();
  lcd.print("Servo Unlocking");
  myservo.write(posOpen);
  Serial.println("Servo Unlocking");
  delay(10000);
  myservo.write(posClosed);
  lcd.clear();
  lcd.print("Servo Locking");
  Serial.println("Servo Locking");
}

void loop() {
  lcd.clear();
  lcd.print("test");
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent())
    return;
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
    return;
  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  if (read_rfid == ok_rfid_1) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (FRED FARMER)" + " -Access Granted");
    Serial.println(read_rfid + " (FRED FARMER)" + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  }
  if (read_rfid == ok_rfid_2) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (JOHN DOE) " + " -Access Granted");
    Serial.println(read_rfid + " (JOHN DOE) " + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  } else {
    lcd.clear();
    lcd.print(read_rfid + " -Access Denied");
    Serial.println(read_rfid + " -Access Denied");
    delay(10000);
    lcd.clear();
    lcd.print("Scan your card:");
    Serial.println("Scan your card:");
  }
}

Why does my 1602a LCD not display text with this code?

#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>
#include <Servo.h>

#define RST_PIN 9 // Configurable, see typical pin layout above
#define SS_PIN 10 // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Servo myservo; // create servo object to control a servo

String read_rfid;
String ok_rfid_1 = "6722323b";
String ok_rfid_2 = "99be859e";
int posClosed = 180; // variable to store the servo position for locked
int posOpen = 0; //same for open...

/*
  Initialize.
*/
void setup() {
  Serial.begin(9600); // Initialize serial communications with the PC
  while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
  SPI.begin(); // Init SPI bus
  mfrc522.PCD_Init(); // Init MFRC522 card
  lcd.begin(16, 2);
  lcd.clear();
  lcd.print("Scan your card:");
  Serial.println("Scan your card:");
  //Choose which lock below:
  myservo.attach(7); // attaches the servo on pin 7 to the servo object
}

/*
  Helper routine to dump a byte array as hex values to Serial.
*/
void dump_byte_array(byte *buffer, byte bufferSize) {
  read_rfid = "";
  for (byte i = 0; i < bufferSize; i++) {
    read_rfid = read_rfid + String(buffer[i], HEX);
  }
}

void open_lock() {
  //Use this routine when working with Servos.
  //lcd.clear();
  lcd.print("Servo Unlocking");
  myservo.write(posOpen);
  Serial.println("Servo Unlocking");
  delay(10000);
  myservo.write(posClosed);
  lcd.clear();
  lcd.print("Servo Locking");
  Serial.println("Servo Locking");
}

void loop() {
  lcd.clear();
  lcd.print("test");
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent())
    return;
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
    return;
  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  if (read_rfid == ok_rfid_1) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (FRED FARMER)" + " -Access Granted");
    Serial.println(read_rfid + " (FRED FARMER)" + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  }
  if (read_rfid == ok_rfid_2) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (JOHN DOE) " + " -Access Granted");
    Serial.println(read_rfid + " (JOHN DOE) " + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  } else {
    lcd.clear();
    lcd.print(read_rfid + " -Access Denied");
    Serial.println(read_rfid + " -Access Denied");
    delay(10000);
    lcd.clear();
    lcd.print("Scan your card:");
    Serial.println("Scan your card:");
  }
}

Why doesn't my 1602A LCD display text with this code?

#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>
#include <Servo.h>

#define RST_PIN 9 // Configurable, see typical pin layout above
#define SS_PIN 10 // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Servo myservo; // create servo object to control a servo

String read_rfid;
String ok_rfid_1 = "6722323b";
String ok_rfid_2 = "99be859e";
int posClosed = 180; // variable to store the servo position for locked
int posOpen = 0; //same for open...

/*
  Initialize.
*/
void setup() {
  Serial.begin(9600); // Initialize serial communications with the PC
  while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
  SPI.begin(); // Init SPI bus
  mfrc522.PCD_Init(); // Init MFRC522 card
  lcd.begin(16, 2);
  lcd.clear();
  lcd.print("Scan your card:");
  Serial.println("Scan your card:");
  //Choose which lock below:
  myservo.attach(7); // attaches the servo on pin 7 to the servo object
}

/*
  Helper routine to dump a byte array as hex values to Serial.
*/
void dump_byte_array(byte *buffer, byte bufferSize) {
  read_rfid = "";
  for (byte i = 0; i < bufferSize; i++) {
    read_rfid = read_rfid + String(buffer[i], HEX);
  }
}

void open_lock() {
  //Use this routine when working with Servos.
  lcd.print("Servo Unlocking");
  myservo.write(posOpen);
  Serial.println("Servo Unlocking");
  delay(10000);
  myservo.write(posClosed);
  lcd.clear();
  lcd.print("Servo Locking");
  Serial.println("Servo Locking");
}

void loop() {
  lcd.clear();
  lcd.print("test");
  // Look for new cards
  if (!mfrc522.PICC_IsNewCardPresent())
    return;
  // Select one of the cards
  if (!mfrc522.PICC_ReadCardSerial())
    return;
  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  if (read_rfid == ok_rfid_1) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (FRED FARMER)" + " -Access Granted");
    Serial.println(read_rfid + " (FRED FARMER)" + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  }
  if (read_rfid == ok_rfid_2) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (JOHN DOE) " + " -Access Granted");
    Serial.println(read_rfid + " (JOHN DOE) " + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  } else {
    lcd.clear();
    lcd.print(read_rfid + " -Access Denied");
    Serial.println(read_rfid + " -Access Denied");
    delay(10000);
    lcd.clear();
    lcd.print("Scan your card:");
    Serial.println("Scan your card:");
  }
}

deleted 115 characters in body; edited title

Source Link

edited Jan 8, 2018 at 6:27

dda

1.6k
1
12
18

Why does my 1602a LCD not display text with this code?

#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>
#include <Servo.h>

#define RST_PIN         9        // Configurable, see typical pin layout above
#define SS_PIN          10          // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Servo myservo;  // create servo object to control a servo

String read_rfid;
String ok_rfid_1 = "6722323b";
String ok_rfid_2 = "99be859e";
int posClosed = 180;    // variable to store the servo position for locked
int posOpen = 0;    //same for open...



/*
 Initialize.
*/
 void setup() {
  Serial.begin(9600);         // Initialize serial communications with the PC
   while (!Serial);            // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
    SPI.begin();                // Init SPI bus
    mfrc522.PCD_Init();         // Init MFRC522 card
    lcd.begin(16, 2);
    lcd.clear();
    lcd.print("Scan your card:");
    Serial.println("Scan your card:");
    //Choose which lock below:
    myservo.attach(7);  // attaches the servo on pin 7 to the servo object
    }

    /*
     Helper routine to dump a byte array as hex values to Serial.
     */
     void dump_byte_array(byte *buffer, byte bufferSize) {
     read_rfid = "";
     for (byte i = 0; i < bufferSize; i++) {
     read_rfid = read_rfid + String(buffer[i], HEX);
      }
     }

void open_lock() {
  //Use this routine when working with Servos.
  //lcd.clear();
  lcd.print("Servo Unlocking");
  myservo.write(posOpen);
  Serial.println("Servo Unlocking");
  delay(10000);
  myservo.write(posClosed);
  lcd.clear();
  lcd.print("Servo Locking");
  Serial.println("Servo Locking");
}

void loop() {
  lcd.clear();
  lcd.print("test");
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent())
    return;

  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
    return;

  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  if (read_rfid == ok_rfid_1) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (FRED FARMER)" + " -Access Granted");
    Serial.println(read_rfid + " (FRED FARMER)" + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");

  }
  if (read_rfid == ok_rfid_2) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (JOHN DOE) " + " -Access Granted");
    Serial.println(read_rfid + " (JOHN DOE) " + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  }
  else {
    lcd.clear();
    lcd.print(read_rfid + " -Access Denied");
    Serial.println(read_rfid + " -Access Denied");
    delay(10000);

    lcd.clear();
    lcd.print("Scan your card:");
    Serial.println("Scan your card:");
  }
}

#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>
#include <Servo.h>

#define RST_PIN 9 // Configurable, see typical pin layout above
#define SS_PIN 10 // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Servo myservo; // create servo object to control a servo

String read_rfid;
String ok_rfid_1 = "6722323b";
String ok_rfid_2 = "99be859e";
int posClosed = 180; // variable to store the servo position for locked
int posOpen = 0; //same for open...

/*
  Initialize.
*/
void setup() {
  Serial.begin(9600); // Initialize serial communications with the PC
  while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
  SPI.begin(); // Init SPI bus
  mfrc522.PCD_Init(); // Init MFRC522 card
  lcd.begin(16, 2);
  lcd.clear();
  lcd.print("Scan your card:");
  Serial.println("Scan your card:");
  //Choose which lock below:
  myservo.attach(7); // attaches the servo on pin 7 to the servo object
}

/*
  Helper routine to dump a byte array as hex values to Serial.
*/
void dump_byte_array(byte *buffer, byte bufferSize) {
  read_rfid = "";
  for (byte i = 0; i < bufferSize; i++) {
    read_rfid = read_rfid + String(buffer[i], HEX);
  }
}

void open_lock() {
  //Use this routine when working with Servos.
  //lcd.clear();
  lcd.print("Servo Unlocking");
  myservo.write(posOpen);
  Serial.println("Servo Unlocking");
  delay(10000);
  myservo.write(posClosed);
  lcd.clear();
  lcd.print("Servo Locking");
  Serial.println("Servo Locking");
}

void loop() {
  lcd.clear();
  lcd.print("test");
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent())
    return;
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
    return;
  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  if (read_rfid == ok_rfid_1) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (FRED FARMER)" + " -Access Granted");
    Serial.println(read_rfid + " (FRED FARMER)" + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  }
  if (read_rfid == ok_rfid_2) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (JOHN DOE) " + " -Access Granted");
    Serial.println(read_rfid + " (JOHN DOE) " + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  } else {
    lcd.clear();
    lcd.print(read_rfid + " -Access Denied");
    Serial.println(read_rfid + " -Access Denied");
    delay(10000);
    lcd.clear();
    lcd.print("Scan your card:");
    Serial.println("Scan your card:");
  }
}

I have tried running the arduino libraryArduino library's "Hello World" example, and it successfully runs the text onto the screen. Therefore I have determined that it is not a hardware problem, rather a code problem. -It It occasionally does display "ff" on the lcdLCD, but that isthat's it.

Why does my 1602a LCD not display text with this code

#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>
#include <Servo.h>

#define RST_PIN         9        // Configurable, see typical pin layout above
#define SS_PIN          10          // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Servo myservo;  // create servo object to control a servo

String read_rfid;
String ok_rfid_1 = "6722323b";
String ok_rfid_2 = "99be859e";
int posClosed = 180;    // variable to store the servo position for locked
int posOpen = 0;    //same for open...



/*
 Initialize.
*/
 void setup() {
  Serial.begin(9600);         // Initialize serial communications with the PC
   while (!Serial);            // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
    SPI.begin();                // Init SPI bus
    mfrc522.PCD_Init();         // Init MFRC522 card
    lcd.begin(16, 2);
    lcd.clear();
    lcd.print("Scan your card:");
    Serial.println("Scan your card:");
    //Choose which lock below:
    myservo.attach(7);  // attaches the servo on pin 7 to the servo object
    }

    /*
     Helper routine to dump a byte array as hex values to Serial.
     */
     void dump_byte_array(byte *buffer, byte bufferSize) {
     read_rfid = "";
     for (byte i = 0; i < bufferSize; i++) {
     read_rfid = read_rfid + String(buffer[i], HEX);
      }
     }

void open_lock() {
  //Use this routine when working with Servos.
  //lcd.clear();
  lcd.print("Servo Unlocking");
  myservo.write(posOpen);
  Serial.println("Servo Unlocking");
  delay(10000);
  myservo.write(posClosed);
  lcd.clear();
  lcd.print("Servo Locking");
  Serial.println("Servo Locking");
}

void loop() {
  lcd.clear();
  lcd.print("test");
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent())
    return;

  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
    return;

  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  if (read_rfid == ok_rfid_1) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (FRED FARMER)" + " -Access Granted");
    Serial.println(read_rfid + " (FRED FARMER)" + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");

  }
  if (read_rfid == ok_rfid_2) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (JOHN DOE) " + " -Access Granted");
    Serial.println(read_rfid + " (JOHN DOE) " + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  }
  else {
    lcd.clear();
    lcd.print(read_rfid + " -Access Denied");
    Serial.println(read_rfid + " -Access Denied");
    delay(10000);

    lcd.clear();
    lcd.print("Scan your card:");
    Serial.println("Scan your card:");
  }
}

I have tried running the arduino library "Hello World" example, and it successfully runs the text onto the screen. Therefore I have determined that it is not a hardware problem, rather a code problem. -It occasionally does display "ff" on the lcd, but that is it.

Why does my 1602a LCD not display text with this code?

#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>
#include <Servo.h>

#define RST_PIN 9 // Configurable, see typical pin layout above
#define SS_PIN 10 // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
Servo myservo; // create servo object to control a servo

String read_rfid;
String ok_rfid_1 = "6722323b";
String ok_rfid_2 = "99be859e";
int posClosed = 180; // variable to store the servo position for locked
int posOpen = 0; //same for open...

/*
  Initialize.
*/
void setup() {
  Serial.begin(9600); // Initialize serial communications with the PC
  while (!Serial); // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
  SPI.begin(); // Init SPI bus
  mfrc522.PCD_Init(); // Init MFRC522 card
  lcd.begin(16, 2);
  lcd.clear();
  lcd.print("Scan your card:");
  Serial.println("Scan your card:");
  //Choose which lock below:
  myservo.attach(7); // attaches the servo on pin 7 to the servo object
}

/*
  Helper routine to dump a byte array as hex values to Serial.
*/
void dump_byte_array(byte *buffer, byte bufferSize) {
  read_rfid = "";
  for (byte i = 0; i < bufferSize; i++) {
    read_rfid = read_rfid + String(buffer[i], HEX);
  }
}

void open_lock() {
  //Use this routine when working with Servos.
  //lcd.clear();
  lcd.print("Servo Unlocking");
  myservo.write(posOpen);
  Serial.println("Servo Unlocking");
  delay(10000);
  myservo.write(posClosed);
  lcd.clear();
  lcd.print("Servo Locking");
  Serial.println("Servo Locking");
}

void loop() {
  lcd.clear();
  lcd.print("test");
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent())
    return;
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial())
    return;
  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  if (read_rfid == ok_rfid_1) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (FRED FARMER)" + " -Access Granted");
    Serial.println(read_rfid + " (FRED FARMER)" + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  }
  if (read_rfid == ok_rfid_2) {
    open_lock();
    lcd.clear();
    lcd.print(read_rfid + " (JOHN DOE) " + " -Access Granted");
    Serial.println(read_rfid + " (JOHN DOE) " + " -Access Granted");
    delay(10000);
    lcd.clear();
    lcd.print("Scan a card:");
    Serial.println("Scan a card:");
  } else {
    lcd.clear();
    lcd.print(read_rfid + " -Access Denied");
    Serial.println(read_rfid + " -Access Denied");
    delay(10000);
    lcd.clear();
    lcd.print("Scan your card:");
    Serial.println("Scan your card:");
  }
}

I have tried running the Arduino library's "Hello World" example, and it successfully runs the text onto the screen. Therefore I have determined that it is not a hardware problem, rather a code problem. It occasionally does display "ff" on the LCD, but that's it.

Bumped by Community user

occurred Jan 8, 2018 at 5:47

Bumped by Community user

occurred Dec 9, 2017 at 1:27

edited tags

Link

edited Nov 8, 2017 at 23:32

user31481

Bumped by Community user

occurred Nov 8, 2017 at 23:22

Bumped by Community user

occurred Oct 9, 2017 at 23:13

Bumped by Community user

occurred Sep 9, 2017 at 22:33

Bumped by Community user

occurred Aug 10, 2017 at 18:46

Bumped by Community user

occurred Jul 11, 2017 at 18:11

Bumped by Community user

occurred Jun 11, 2017 at 3:25

Bumped by Community user

occurred May 11, 2017 at 23:03

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asked Jun 13, 2016 at 18:37

davester14

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Why doesdoesn't my 1602a1602A LCD not display text with this code?

Why does my 1602a LCD not display text with this code?

Why doesn't my 1602A LCD display text with this code?

Why does my 1602a LCD not display text with this code?

Why does my 1602a LCD not display text with this code

Why does my 1602a LCD not display text with this code?