This project comprises of four components:

1. LED Blinking System
2. Temperature Controlled Fan
3. Smoke Detector
4. Water Level Monitoring System

Components required:

1. LEDs
2. Breadboard
3. Jumper Wires
4. NodeMCU ESP8266 Wi-Fi Module with micro-USB cable

Code:

1. Replace ssid and password with your network name and password.

Components required:

1. Two-wire Computer Fan
2. MOSFET module
3. Breadboard
4. Jumper Wires
5. NodeMCU ESP8266 Wi-Fi Module with micro-USB cable

Components required:

1. MQ135 Gas Sensor
2. Breadboard
3. Jumper Wires
4. NodeMCU ESP8266 Wi-Fi Module with micro-USB cable

Code:

1. Create an authorization key in Blynk App that is to be put up in the code.
2. Create a gauge widget giving the appropriate pins as in the code.
3. Connect the NodeMCU and mobile phone to the same network.
4. Replace ssid and pass with your network credentials.

Components required:

1. HC-SR04 Ultrasonic Sensor
2. Breadboard
3. Jumper Wires
4. NodeMCU ESP8266 Wi-Fi Module with micro-USB cable

Code:

1. Replace ssid and password with your network name and password.