Brief Introduction of Internet of Things

The Internet of Things is the inter-networking of physical devices, vehicles, buildings, and other items embedded with electronics, software, sensors, actuators, and network connectivity that enable these objects to collect and exchange data.

This Robot takes command from remote device (Smart Phone) which is connected to internet and command is received and decoded with the help of nodeMCU which gives the command to l293d motor driver module.

This motor driver module used to drive an inductive load like motor according to input of this IC.

Hardware

NodeMCU – WiFi IoT Module It is an open-source LUA based firmware developed for ESP8266 wifi chip. By exploring functionality with the ESP8266 chip, NodeMCU firmware comes with ESP8266.

L293D – MOTOR DRIVER IC The L293 and L293D devices are quadruple high-current half-H drivers. The L293 is designed to provide bidirectional drive currents of up to 1 A at voltages from 4.5 V to 36 V. The L293D is designed to provide bidirectional drive currents of up to 600-mA at voltages from 4.5 V to 36 V.

DC Motor. (12Volt 1Amp 1000rmp)

Breadboard

Robot Chassis. 2  wheeler Chassis with two Tyre

Jumper Wires.

 Jumper wire which is used to the connection of these modules.

Mainly male-female jumper wire is used on this type of project.

12V Adopter.

12 volts  2 Amp. Current

OR

1.5 V * 4 =12V Cell

Block diagram

Wiring Connection

• Connect D0,D1,D2,D3 of NodeMCU development module to IN1,IN2,IN3,IN4 pin of l293d module respectively.
• Connect Positive Negative of DC motor to the output of Motor Driver Module.
• Connect 12volt 2amp adopter + and – to the Vin and GND of l293d.
• Connect EN1 and EN2 to D5,D6 pin of nodemcu
• Connect Vin and Gnd of l293d module to Vin and gnd of NodeMCU.

Configure Blynk Android Software

• Create an account in Blynk app and create new project Select board NODEMCUand select push buttons and configure them with digital pins and level of buttons.
• Blynk app is connected with local Wi-Fi router and this app generates unique authentication code which will get through email copy this code it will needed in arduino code.
• For More Information check out this video to how to setup blynk app – https://www.youtube.com/watch?v=xKY78kb5T84

Configure Arduino IDE for Nodemcu

• First download arduino from official website.
• For arduino setup watch this video – https://www.youtube.com/watch?v=ziio2rUxjeE
• Select Board and com port.
• Set baud rate.
• If com port is not shown then download CH340 driver.

Arduino code For Nodemcu

#include <ESP8266WiFi.h>

#include <BlynkSimpleEsp8266.h>

// You should get Auth Token in the Blynk App.

// Go to the Project Settings (nut icon).

char auth[] = “YourAuthToken”;

// Your WiFi credentials.

// Set password to “” for open networks.

char ssid[] = “YourNetworkName”;

char pass[] = “YourPassword”;

void setup()

{

  // Debug console

  Serial.begin(9600);

  Blynk.begin(auth, ssid, pass);

}

void loop()

{

  Blynk.run();

}