Hallo
Ich möchte über eine TCP verbindung CHAR Daten einer SPS an einen Arduino LCD anzeigen.
Habe folgendes Problem. Ich sende die Daten an das Arduino und der Char " Hallo" wird im LCd mehrfach angezeigt .
So etwar.
HALLO HAL
HALLO HAL
Hier mal mein Programm
hat Server
A simple server that distributes any incoming messages to all
connected clients. To use telnet to your device's IP address and type.
You can see the client's input in the serial monitor as well.
Using an Arduino Wiznet Ethernet shield.
Circuit:
* Ethernet shield attached to pins 10, 11, 12, 13
* Analog inputs attached to pins A0 through A5 (optional)
created 18 Dec 2009
by David A. Mellis
modified 9 Apr 2012
by Tom Igoe
*/
#include <SPI.h>
#include <Ethernet.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x3F,16,2);
// Enter a MAC address and IP address for your controller below.
// The IP address will be dependent on your local network.
// gateway and subnet are optional:
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress ip(192,168,178, 50);
IPAddress gateway(192,168,178, 1);
IPAddress subnet(255, 255, 255, 0);
// telnet defaults to port 23
EthernetServer server(2500);
boolean alreadyConnected = false; // whether or not the client was connected previously
void setup() {
lcd.init(); // initialize the lcd
// Print a message to the LCD.
lcd.backlight();
lcd.setCursor(0,0);
lcd.print("Starten");
lcd.setCursor(0,1);
lcd.print("System");
delay( 3000);
lcd.clear();
// initialize the ethernet device
Ethernet.begin(mac, ip, gateway, subnet);
// start listening for clients
server.begin();
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
Serial.print("Chat server address:");
Serial.println(Ethernet.localIP());
}
void loop() {
// wait for a new client:
EthernetClient client = server.available();
// when the client sends the first byte, say hello:
if (client) {
if (!alreadyConnected) {
// clead out the input buffer:
client.flush();
Serial.println("We have a new client");
client.println("Hello, client!");
alreadyConnected = true;
lcd.clear();
lcd.setCursor(0,0);
lcd.print(" Verbunden ");
delay( 2000);
lcd.clear();
}
if (client.available() > 0) {
// read the bytes incoming from the client:
char thisChar = client.read();
// echo the bytes back to the client:
server.write(thisChar);
// echo the bytes to the server as well:
Serial.write(thisChar);
lcd.print(thisChar);
delay( 0);
}
}
if (client.available() < 1) {
// wait a bit for the entire message to arrive
delay(1000);
// clear the screen
lcd.clear();
lcd.setCursor(0,0);
lcd.print("");
delay(0);
lcd.clear();
// read all the available characters
}
}
Was muss ich ändern damit der Text im LCD angezeigt wird bis eine neuer Text gesendet wird ? Der Text soll nur einmal angezeigt werden
- Hallo *
-
