Operácie

Serial LCD by Scott Edwards and Arduino: Rozdiel medzi revíziami

Z SensorWiki
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* [http://www.seetron.com/bpk000_1.htm LCD Serial Backpack] - product page
 
* [http://www.seetron.com/bpk000_1.htm LCD Serial Backpack] - product page
 
* [http://www.seetron.com/pdf/bpk_mnl.pdf LCD Serial Backpack manual]  
 
* [http://www.seetron.com/pdf/bpk_mnl.pdf LCD Serial Backpack manual]  
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#define INVERTED true    // this is impossible with standard Software Serial library
 
#define INVERTED true    // this is impossible with standard Software Serial library
  
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NewSoftSerial lcd(rxPin, txPin,INVERTED);  // set up a new serial port
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NewSoftSerial lcd(rxPin, txPin,INVERTED);  // set up a new inverted serial port on pins 2 and 3
  
 
void setup() {
 
void setup() {
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   delay(100);  
 
   delay(100);  
  
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   lcd.print(254,BYTE);
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   lcd.print(254,BYTE);     // 254 is a command prefix
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   lcd.print(1,BYTE);
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   lcd.print(1,BYTE);       // 1 is a Display Clear command
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   delay(10);
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   delay(10);               // this command takes long time
  
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   lcd.print(254,BYTE);
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   lcd.print(254,BYTE);     // for unknown reasons this is
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   lcd.print(1,BYTE);
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   lcd.print(1,BYTE);       // necessary to repeat 2x
 
   delay(10);
 
   delay(10);
  
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   lcd.print(254,BYTE);
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   lcd.print(254,BYTE);     // 254 is a command prefix
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   lcd.print(2 ,BYTE);
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   lcd.print(2 ,BYTE);       // 2 is a Home command
 
   delay(10);
 
   delay(10);
  
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}
 
}
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</source>
 
</source>

Verzia zo dňa a času 20:45, 19. október 2010

This serial LCD is not a direct connectible to the Arduino boards as it uses inverted signals (which is OK if You use e.g. RS-232 or Basic Stamp).

Solutions:

a) use an hardware inverter. You can either use one section of an inverter IC, like a 7404, or a simple one-transistor inverter.

b) use an improved NewSoftSerial library. It enables to invert signals. Following program works like a charm. 

#include <NewSoftSerial.h>

#define rxPin 2
#define txPin 3

#define INVERTED true    // this is impossible with standard Software Serial library

NewSoftSerial lcd(rxPin, txPin,INVERTED);  // set up a new inverted serial port on pins 2 and 3

void setup() {

  pinMode(rxPin, INPUT);    // define pin modes for tx, rx:
  pinMode(txPin, OUTPUT);
  lcd.begin(9600);

  delay(100); 

  lcd.print(254,BYTE);      // 254 is a command prefix
  lcd.print(1,BYTE);        // 1 is a Display Clear command
  delay(10);                // this command takes long time

  lcd.print(254,BYTE);      // for unknown reasons this is 
  lcd.print(1,BYTE);        // necessary to repeat 2x
  delay(10);

  lcd.print(254,BYTE);      // 254 is a command prefix
  lcd.print(2 ,BYTE);       // 2 is a Home command
  delay(10);

  lcd.print("Hello, World!");
}

void loop() {
  lcd.print(254,BYTE);
  lcd.print(192,BYTE);        // set the cursor to column 0, line 1

  lcd.print(millis()/1000);   // print the number of seconds since reset:

}
Zdroj: „https://senzor.robotika.sk/sensorwiki/index.php?title=Serial_LCD_by_Scott_Edwards_and_Arduino&oldid=2278“