Nokia 5110
Com este projecto pretende-se ligar um LCD Nokia 5110 ao Arduino.
LCD:
Como os pinos do Arduino têm uma saída de 5V e o LCD funciona apenas com 3.3V, temos de utilizar uma protecção entre os pinos do LCD e os do Arduino.
Existe um tutorial pela Sparkfun sobre isto: http://www.sparkfun.com/tutorials/65 e informação aqui presente foi baseada no trabalho de "Rechena" em http://arduino.rechena.com/?p=305
Eu neste projecto usei 6 resistências de 10K para ligar o LCD ao Arduino.
Esquema utilizado:
LCD Pino 1 --> Arduino Pino 3.3V
LCD Pino 2 --> Arduino Pino GRND
LCD Pino 3 --> Resistência 10K --> Arduino Pino Digital 7
LCD Pino 4 --> Resistência 10K --> Arduino Pino Digital 6
LCD Pino 5 --> Resistência 10K --> Arduino Pino Digital 5
LCD Pino 6 --> Resistência 10K --> Arduino Pino Digital 4
LCD Pino 7 --> Resistência 10K --> Arduino Pino Digital 3
LCD Pino 8 --> Resistência 10K --> Arduino Pino Digital 8 (opcional)
SOFTWARE:
Utilizei a biblioteca PCD8544
Exemplo "Hello World" utilizando o Pino Digital 8 do Arduino para acender o Led Backlight do LCD (opcional):
/*
* PCD8544 - Interface with Philips PCD8544 (or compatible) LCDs.
*
* Copyright (c) 2010 Carlos Rodrigues <cefrodrigues@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
/*
* To use this sketch, connect the eight pins from your LCD like thus:
*
* Pin 1 -> +3.3V (rightmost, when facing the display head-on)
* Pin 2 -> Arduino digital pin 3
* Pin 3 -> Arduino digital pin 4
* Pin 4 -> Arduino digital pin 5
* Pin 5 -> Arduino digital pin 7
* Pin 6 -> Ground
* Pin 7 -> 10uF capacitor -> Ground
* Pin 8 -> Arduino digital pin 6
*
* Since these LCDs are +3.3V devices, you have to add extra components to
* connect it to the digital pins of the Arduino (not necessary if you are
* using a 3.3V variant of the Arduino, such as Sparkfun's Arduino Pro).
*/
#include <PCD8544.h>
// A custom glyph (a smiley)...
static const byte glyph[] = { B00010000, B00110100, B00110000, B00110100, B00010000 };
static PCD8544 lcd;
int ledPin =8; // LED Backlight
void setup() {
pinMode(ledPin, OUTPUT); // sets the digital pin as output
digitalWrite(ledPin, HIGH); // sets the LED on
// PCD8544-compatible displays may have a different resolution...
lcd.begin(84, 48);
// Add the smiley to position "0" of the ASCII table...
lcd.createChar(0, glyph);
}
void loop() {
// Just to show the program is alive...
static int counter = 0;
// Write a piece of text on the first line...
lcd.setCursor(0, 0);
lcd.print("Hello, World!");
lcd.setCursor(0, 1);
lcd.print("Project by:");
lcd.setCursor(0, 2);
lcd.print(" AlmaMater");
lcd.setCursor(0, 3);
lcd.print("Arduino Rocks!");
// Write the counter on the last line...
lcd.setCursor(0, 5);
lcd.print(" ");
lcd.print(counter, DEC);
lcd.write(' ');
lcd.write(0); // write the smiley
delay(500);
counter++;
}
No caso de pretendermos alterar os pinos no Arduino, temos de alterar directamente o código na lib PCD8544.h (logo no início):
// The pins used by this library... #define PCD8544_SCLK 3 /* clock (display pin 2) */ #define PCD8544_SDIN 4 /* data-in (display pin 3) */ #define PCD8544_DC 5 /* data select (display pin 4) */ #define PCD8544_RESET 6 /* reset (display pin 8) */ #define PCD8544_SCE 7 /* enable (display pin 5) */
Adaptando ao nosso esquema apenas para melhor se perceber os pinos no LCD/Display:
// The pins used by this library... #define PCD8544_SCLK 3 /* clock (display pin 7) */ #define PCD8544_SDIN 4 /* data-in (display pin 6) */ #define PCD8544_DC 5 /* data select (display pin 5) */ #define PCD8544_RESET 6 /* reset (display pin 4) */ #define PCD8544_SCE 7 /* enable (display pin 3) */
Algumas fotos do resultado:
