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
In this tutorial we are making ESP32 as both Station and Access point and web server. We have seen how to connect to WiFi Router and make web server in previous post.
A Web server is a program that uses HTTP (Hypertext Transfer Protocol) to serve the files that form Web pages to users, in response to their requests, which are forwarded by their computers’ HTTP clients.
Continue reading ESP32 Access point (AP) and Station web server with HTML using Arduino IDE
In many IoT Applications we monitor sensor data and we want to display it in wab page. Web page requires frequent refresh to get the update from ESP32. To solve this problem you have two options, first is refresh page with HTML Tag: ex. refresh at every 30 seconds.
<head>
<meta http-equiv=”refresh” content=”30″>
</head>
In this tutorial I will show you how to display ADC data and update without refreshing web page. You can do a lot of things with this. At the end we will see some advance applications of this. To make this possible we need to use javaScript Ajax.
only ESP32, Laptop and USB cable
Continue reading Web server on ESP32: How to update and display sensor values?
In this tutorial we interface RCWL-0516 Human body induction switch module Intelligent sensor (Radar Motion sensor) with Arduino.
This mini doppler radar motion sensor module is equipped with supporting DC 4-28V wide voltage. It will automatically continuously output the high level TTL signal when there is motion. 360 degree no blind angle detection and maximum 7m sensing distance. It is perfect for DIY microwave motion sensor light switch, human sensor toys, smart security devices, etc.
Continue reading RCWL-0516 Doppler Radar Sensor Interface with Arduino
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