In this tutorial we see how to turn off ESP8266 WiFi, There are two methods to turn off wifi first is to use simple ESP8266WiFi.h Library and use WiFi.mode(WIFI_OFF); and another method to use WiFi.forceSleepBegin(); By turning wifi off you can save some power. or using only (WIFI_STA) station mode you can hide ESPs own Access point.
Connecting ESP8266 to WiFi is first step when using ESP8266. In all projects of ESP8266 Connecting to WiFi and then accessing other thing is must. ESP8266 can operate in three different modes: Wi-Fi station, Wi-Fi access point, and both at the same time. Let’s Connect ESP8266 NodeMCU to WiFi.
Continue reading Connecting ESP8266 to wifi router (HotSpot) Example
In this tutorial we are making ESP8266 NodeMCU as TCP Socket Server for bidirectional communication. Before we start directly on Socket programming let’s have some understanding of what is TCP Socket.
Continue reading ESP8266 NodeMCU TCP Socket Server Arduino Example
The arduino and ESP8266 EEPROM library only provides functions to read and write one byte at a time from the internal EEPROM. Note that EEPROM has limited number of writes.
In this tutorial I will provide some functions to store string to EEPROM and Read back to String variable. String is basically character array terminated with null (0x00).
Continue reading Arduino reading and writing string to EEPROM
In this tutorial we upload a text file and read it in serial monitor.
ESP8266FS is a tool which integrates into the Arduino IDE. It adds a menu item to Tools menu for uploading the contents of sketch data directory into ESP8266 flash file system.
Download the tool: https://github.com/esp8266/arduino-esp8266fs-plugin/releases/download/0.1.3/ESP8266FS-0.1.3.zip.
In above process we uploaded notes.txt file in ESP flash. In this program we read it and display its contents in serial monitor. Uploading of sketch will not affect sketch data. i.e. uploaded notes.txt file.
/*
* ESP8266 Communication and Protocols
* SPIFFS Direct File Upload Example
* -Manoj R. Thkuar
*/
#include <ESP8266WiFi.h>
#include <FS.h> //Include File System Headers
const char* file = "/notes.txt"; //Enter your file name
void setup() {
delay(1000);
Serial.begin(115200);
Serial.println();
//Initialize File System
SPIFFS.begin();
Serial.println("File System Initialized");
File dataFile = SPIFFS.open(file, "r"); //Open File for reading
Serial.println("Reading Data from File:");
//Data from file
for(int i=0;i<dataFile.size();i++) //Read upto complete file size
{
Serial.print((char)dataFile.read()); //Read file
}
dataFile.close();
}
void loop() {
}
In serial monitor you will get File contents, you can upload images, html and javascript files. examples can be found here