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Node MCU ESP 8266 Text To I2C LCD Example
by jamied_uk 15th August 2017, 03:46
- Code:
// (c) J~NET
// jnet.forumotion.com/t1549-node-mcu-esp-8266-text-to-i2c-lcd-example#2350
// https://tttapa.github.io/ESP8266/Chap10%20-%20Simple%20Web%20Server.html
// https://startingelectronics.org/tutorials/arduino/web-page-to-LCD
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x38, 16, 2);
// Clear Serial Buffer
void serialFlush(){
while(Serial.available() > 0) {
char text_display = Serial.read();
}
}
// #define OLED_RESET 4
const char* ssid = "WIFI-AP-NAME";
const char* password = "WIFI-AP-PASSWORD";
ESP8266WebServer server(80);
const int output1 = 14;
const int output2 = 12;
const int output3 = 13;
const int output4 = 15;
boolean device1 = false;
boolean device2 = false;
boolean device3 = false;
boolean device4 = false;
void handleRoot() {
//digitalWrite(led, 1);
http://server.send(200, "text/plain", "hello from esp8266!");
//digitalWrite(led, 0);
http://server.send(200, "text/plain", "<!DOCTYPE HTML>\r\n");
String msg;
String cmd;
cmd += "<!DOCTYPE HTML>\r\n";
cmd += "<html>\r\n";
cmd += "<header><title>I2C LCD Text Server</title>";
cmd += "<head>";
cmd += "<h1>\"I2C LCD Text Server\"</h1></header>";
cmd += "</head>";
cmd += "<form action=\"/submit\">Text To Display:<br><input type=\"text\" name=\"text_display\"><br><input type=\"submit\" value=\"Submit\"></form>";
server.send(200, "text/html", cmd);
}
void handleNotFound(){
//digitalWrite(led, 1);
String message = "File Not Found\n\n";
String msg;
// char readString = client.read();
message += "URI: ";
message += server.uri();
message += "\nMethod: ";
message += (server.method() == HTTP_POST)?"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";
// put message into lcd
lcd.clear();
// message myArray[] = message;
lcd.print(server.arg(4)); // text_display
msg = server.arg(0); //
lcd.print(msg); // text_display
// add delay and scroll effects here
handleRoot();
}
server.send(404, "text/plain", message);
//digitalWrite(led, 0);
}
void setup(void){
lcd.begin();
lcd.backlight();
// lcd.print("Please Wait...");
pinMode(output1, OUTPUT);
pinMode(output2, OUTPUT);
pinMode(output3, OUTPUT);
pinMode(output4, OUTPUT);
digitalWrite(output1, LOW);
digitalWrite(output2, LOW);
digitalWrite(output3, LOW);
digitalWrite(output4, LOW);
Serial.begin(115200);
WiFi.mode(WIFI_STA); // comment out this line to NOT use a router as an AP
WiFi.begin(ssid, password);
http://lcd.print("");
Serial.println("IP:");
Serial.println(WiFi.localIP());
// by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
http://display.begin(SSD1306_SWITCHCAPVCC, 0x3D); // initialize with the I2C addr 0x3D (for the 128x64)
delay(2000);
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(500);
// Serial.print(".");
// lcd.print("Please Wait...");
}
Serial.println("");
Serial.print("Connected to ");
Serial.println(ssid);
Serial.print("IP address: ");
lcd.print(WiFi.localIP());
Serial.println(WiFi.localIP());
if (MDNS.begin("esp8266")) {
Serial.println("MDNS responder started");
}
server.on("/", handleRoot);
// server.on("/submit", handleSubmit);
if (server.args() > 0 ) {
for ( uint8_t i = 0; i < server.args(); i++ ) {
if (server.argName(i) == "text_display") {
// server.arg("text_display");
// do something here with value from server.arg(i);
// output text to serial console & lcd
Serial.println("text_display");
lcd.print("text_display");
}
}
}
server.onNotFound(handleNotFound);
server.begin();
Serial.println("HTTP server started");
}
void loop(void){
server.handleClient();
}
Now im working on a scroll after a short delay, I think this will look smart so watch out for part 2
More info about scroll here arduino.cc/en/Tutorial/LiquidCrystalScroll
Last edited by jamied_uk on 15th August 2017, 05:09; edited 3 times in total
jamied_uk- Admin
- Posts : 2951
Join date : 2010-05-09
Age : 41
Location : UK -
Re: Node MCU ESP 8266 Text To I2C LCD Example
by jamied_uk 15th August 2017, 04:23
Please remember to unplug after uploading new web servers to esp and plug back in give it 20 seconds or so and then goto the ip!
jamied_uk- Admin
- Posts : 2951
Join date : 2010-05-09
Age : 41
Location : UK -
Re: Node MCU ESP 8266 Text To I2C LCD Example
by jamied_uk 15th August 2017, 04:46
Also you can post to this server from another system via command line
Example:
For more info see
askubuntu.com/questions/299870/http-post-and-get-using-curl-in-linux
- Code:
curl --data "param1=value1¶m2=value2" http://hostname/resource
Example:
- Code:
curl --data "text_display=TEXT-HERE" 192.168.0.100/
For more info see
askubuntu.com/questions/299870/http-post-and-get-using-curl-in-linux
jamied_uk- Admin
- Posts : 2951
Join date : 2010-05-09
Age : 41
Location : UK -
Re: Node MCU ESP 8266 Text To I2C LCD Example
by jamied_uk 15th August 2017, 16:25
Send Text To LCD Display With Linux Command Line Or Script
- Code:
#!/bin/bash
# (c) J~NET 2017
# ./run.sh
# jnet.forumotion.com/t1549-node-mcu-esp-8266-text-to-i2c-lcd-example#2352
#
echo "Input Text To Send To LCD"
read uin
curl --data "text_display=$uin" 192.168.0.62/submit
clear
echo "Text Sent"
#
jamied_uk- Admin
- Posts : 2951
Join date : 2010-05-09
Age : 41
Location : UK -
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