IoT based Projects: Realization with Raspberry Pi, NodeMCU and Arduino

CHAPTER 1

ESP8266-based Wireless Web Server

The ESP8266 is a low-cost Wi-Fi microchip with full TCP/IP stack manufactured in 2014. This chapter discusses the open source platform, NodeMCU with ESP8299 WiFi SoC. The circuit diagram and interfacing steps are discussed to understand the working of NodeMCU to control the home appliances with the web server.

Introduction

To understand the interfacing of NodeMCU, a system is designed to control the home appliances with the local server. NodeMCU is an open source IoT platform. It includes firmware which runs on the ESP8266 Wi-Fi SoC. NodeMCU, as shown in Figure 1.1, provides access to the GPIO (General Purpose Input/Output):

Figure 1.1: NodeMCU

For developing purposes, the pin description is shown in following Table 1.1:

Table 1.1: ESP8266 pin description

The home appliances can be controlled with NODEMCU through relays. Figure 1.2 shows the detailed block diagram of the system and Table 1.2 shows the component list required for the system. It shows the block diagram of the system. It comprises NodeMCU, LCD, power supply, and electrical appliances:

Figure 1.2: Block Diagram

Table 1.2 shows the list of components required to design the system:

Table 1.2: Components List

Circuit diagram

The circuit diagram of the system is shown in Figure 1.3 and the description of the system is as follows:

NodeMCU D0 pin is attached to RS pin of