BitBastelei #287 – HD44780 LCDs mit Arduino

BitBastelei #287 - HD44780 LCDs mit Arduino

(529 MB) 00:29:36

2018-06-10 10:00 🛈

Displays mit HD44780-Controller sind so ziemlich die einfachste Möglichkeit eine Bildschirmausgabe mit Mikrocontrollern zu bewerkstelligen. Zwar können diese Module nur wenige Zeichen zeigen, da sie allerdings überall günstig zu haben und sehr einfach anzusteuern sind findet man sie auch heute noch in vielen Projekten.

#include <LiquidCrystal.h>

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>

const char *ssid = "freifunk-myk.de";
const char *password = "";
const char *netname = "esp-lcd";

ESP8266WebServer server ( 80 );

const int rs = D0, en = D2, d4 = D3, d5 = D4, d6 = D5, d7 = D6, rw = D1, blight = D7;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const char INDEX_HTML[] =
"<!DOCTYPE HTML>"
"<html>"
"<head>"
"<meta name = \"viewport\" content = \"width = device-width, initial-scale = 1.0, maximum-scale = 1.0, user-scalable=0\">"
"<title>ESP8266 LCD Demo</title>"
"<style>"
"\"body { background-color: #808080; font-family: Arial, Helvetica, Sans-Serif; Color: #000000; }\""
"</style>"
"</head>"
"<body>"
"<h1>ESP8266 LCD Demo</h1>"
"<FORM action=\"/\" method=\"post\">"
"<P>"
"Text:<br>"
"1: <INPUT type=\"text\" name=\"text1\" value=\"\"><BR>"
"2: <INPUT type=\"text\" name=\"text2\" value=\"\"><BR>"
"Hintergrund:<br>"
"<INPUT type=\"radio\" name=\"LED\" value=\"1\">On<BR>"
"<INPUT type=\"radio\" name=\"LED\" value=\"0\">Off<BR>"
"<INPUT type=\"submit\" value=\"Send\"> <INPUT type=\"reset\">"
"</P>"
"</FORM>"
"</body>"
"</html>";

void handleRoot()
{
  if (server.hasArg("text1")) {
    handleSubmit();
  }
  else {
    server.send(200, "text/html", INDEX_HTML);
  }
}

void returnFail(String msg)
{
  server.sendHeader("Connection", "close");
  server.sendHeader("Access-Control-Allow-Origin", "*");
  server.send(500, "text/plain", msg + "\r\n");
}

void handleSubmit()
{
  String LEDvalue;

  if (server.hasArg("LED")) {
    LEDvalue = server.arg("LED");
    if (LEDvalue == "1") {
      digitalWrite(blight, LOW);
    }
    else if (LEDvalue == "0") {
      digitalWrite(blight, HIGH);
    }
    else {
      Serial.print("Arg LED failed: ");
      Serial.println(LEDvalue);
    }
  }
  
  if (server.hasArg("text1") || server.hasArg("text2")) {
    lcd.clear();
  }

  if (server.hasArg("text1")) {
    lcd.setCursor(0, 0);
    lcd.print(server.arg("text1"));
  }
  if (server.hasArg("text2")) {
    lcd.setCursor(0, 1);
    lcd.print(server.arg("text2"));
  }
  
  server.send(200, "text/html", INDEX_HTML);
}

void returnOK()
{
  server.sendHeader("Connection", "close");
  server.sendHeader("Access-Control-Allow-Origin", "*");
  server.send(200, "text/plain", "OK\r\n");
}

void handleNotFound()
{
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET)?"GET":"POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i=0; i<server.args(); i++){
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }
  server.send(404, "text/plain", message);
}

void setup() {
  Serial.begin(115200);
  
  //RW - always GND
  pinMode(rw, OUTPUT);
  digitalWrite(rw, LOW);
  
  //Backlight - default GND/ON
  pinMode(blight, OUTPUT);
  digitalWrite(blight, LOW);
  
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print(ssid);
  lcd.setCursor(0, 1);
  lcd.print("Connect...");
  lcd.setCursor(0, 1);
  WiFi.mode ( WIFI_STA );
  WiFi.begin ( ssid, password );
  
  // Wait for connection
  while ( WiFi.status() != WL_CONNECTED ) {
    delay ( 500 );
    Serial.print ( "." );
  }
  
  Serial.println ( "" );
  Serial.print ( "Connected to " );
  Serial.println ( ssid );
  Serial.print ( "IP address: " );
  Serial.println ( WiFi.localIP() );
  lcd.print(WiFi.localIP());

  if ( MDNS.begin ( netname ) ) {
    Serial.println ( "MDNS responder started" );
  }

  server.on("/", handleRoot);
  server.onNotFound(handleNotFound);
  server.begin();

  delay(1500);
}

void loop() {
  server.handleClient();
  if(Serial.available()) {
    char in = Serial.read();
    if(in == '~') {
      lcd.setCursor(0, 0);
    }else{
      lcd.print(in);
    }
  }
}

 

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