Circuit Documentation

Summary of the Circuit

This circuit integrates various components to perform multiple functions. It includes sensors for environmental monitoring, a microcontroller for processing and control, a motor driver to control a stepper motor, and a GSM module for communication capabilities. The power supply is provided by a 12V battery, and the Arduino UNO microcontroller is the central processing unit that interfaces with all other components.

Component List

MQ135 Air Quality Sensor

• Pins: VCC, GND, A0, D0
• Description: This sensor is used for monitoring air quality by detecting various gases in the air.

Nema 17 42-STH48 Stepper Motor

• Pins: A2 (black), A1 (green), B2 (red), B1 (blue)
• Description: A stepper motor used for precise control of angular or linear position, velocity, and acceleration.

12V Battery

• Pins: +, -
• Description: Provides the power supply for the circuit.

Arduino UNO

• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0-A5, SCL, SDA, AREF, D0-D13
• Description: A microcontroller board based on the ATmega328P, used for controlling the logic of the circuit.

DHT11 Humidity and Temperature Sensor

• Pins: VDD, DATA, NULL, GND
• Description: Measures ambient temperature and humidity.

L298N DC Motor Driver

• Pins: OUT1-OUT4, 12V, GND, 5V, ENA, ENB, IN1-IN4
• Description: An integrated circuit used to control the stepper motor.

GSM SIM900 Module

• Pins: A0-A5, 5V, GND, 3.3V, RESET, D0-D13, AREF
• Description: A GSM/GPRS module for cellular communication.

Wiring Details

MQ135 Air Quality Sensor

• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• A0 connected to Arduino UNO A1

Nema 17 42-STH48 Stepper Motor

• A2 (black) connected to L298N DC motor driver OUT2
• A1 (green) connected to L298N DC motor driver OUT1
• B2 (red) connected to L298N DC motor driver OUT4
• B1 (blue) connected to L298N DC motor driver OUT3

12V Battery

• + connected to L298N DC motor driver 12V
• - connected to Arduino UNO GND and L298N DC motor driver GND

Arduino UNO

• 5V connected to DHT11 VDD, L298N DC motor driver 5V, and MQ135 VCC
• GND connected to DHT11 GND, MQ135 GND, and L298N DC motor driver GND
• A1 connected to MQ135 A0
• D7 connected to DHT11 DATA
• D8-D11 connected to L298N DC motor driver IN1-IN4

DHT11 Humidity and Temperature Sensor

• VDD connected to Arduino UNO 5V
• DATA connected to Arduino UNO D7
• GND connected to Arduino UNO GND

L298N DC Motor Driver

• ENA, ENB connected to Arduino UNO 5V
• IN1-IN4 connected to Arduino UNO D8-D11
• OUT1-OUT4 connected to Nema 17 42-STH48
• 12V connected to 12V Battery +
• GND connected to 12V Battery - and Arduino UNO GND
• 5V connected to Arduino UNO 5V

Documented Code

Arduino UNO Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Note: The provided code is a template and does not include specific functionality. It should be populated with the logic required to control the components in the circuit based on the desired application.