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Serial LCD by Scott Edwards and Arduino: Rozdiel medzi revíziami

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(Nová stránka: 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 in...)
 
Riadok 4: Riadok 4:
  
 
a) use an hardware inverter. You can either use one section of an inverter IC, like a 7404, or a simple [http://www.seetron.com/images/invert.gif one-transistor inverter].
 
a) use an hardware inverter. You can either use one section of an inverter IC, like a 7404, or a simple [http://www.seetron.com/images/invert.gif one-transistor inverter].
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b) use an improved NewSoftSerial library. It enables to invert signals. Following program works like a charm.
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<source lang="c">
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#include <NewSoftSerial.h>
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#define rxPin 2
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#define txPin 3
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#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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void setup() {
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  pinMode(rxPin, INPUT);    // define pin modes for tx, rx:
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  pinMode(txPin, OUTPUT);
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  lcd.begin(9600);
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  delay(100);
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  lcd.print(254,BYTE);
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  lcd.print(1,BYTE);
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  delay(10);
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  lcd.print(254,BYTE);
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  lcd.print(1,BYTE);
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  delay(10);
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  lcd.print(254,BYTE);
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  lcd.print(2 ,BYTE);
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  delay(10);
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  lcd.print("Hello, World!");
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}
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void loop() {
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  lcd.print(254,BYTE);
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  lcd.print(192,BYTE);        // set the cursor to column 0, line 1
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  lcd.print(millis()/1000);  // print the number of seconds since reset:
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}
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</source>

Verzia zo dňa a času 20:40, 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 serial port

void setup() {

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

  delay(100); 

  lcd.print(254,BYTE);
  lcd.print(1,BYTE);
  delay(10);

  lcd.print(254,BYTE);
  lcd.print(1,BYTE);
  delay(10);

  lcd.print(254,BYTE);
  lcd.print(2 ,BYTE);
  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=2275“