Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to control multiple motors and a water pump using an Arduino Nano microcontroller. The circuit includes a Bluetooth module for wireless communication, a motor driver for controlling the motors, a relay for switching the water pump, and a rocker switch for manual control. The circuit is powered by a 12V battery and includes a DC barrel jack for easy power connection.

Component List

1. L298N DC Motor Driver

   • Description: Motor driver module used to control the direction and speed of DC motors.
   • Pins: OUT1, OUT2, 12V, GND, 5V, OUT3, OUT4, 5V-ENA-JMP-I, 5V-ENA-JMP-O, +5V-J1, +5V-J2, ENA, IN1, IN2, IN3, IN4, ENB

2. Battery 12V

   • Description: Power source for the circuit.
   • Pins: +, -

3. Rocker Switch

   • Description: Manual switch to control the power supply.
   • Pins: 1, 2

4. HC-05 Bluetooth Module

   • Description: Bluetooth module for wireless communication.
   • Pins: Key, VCC, GND, TXD, RXD, State

5. Motor with Reducer

   • Description: DC motor with a gear reducer for increased torque.
   • Pins: 3 - 6 VCC, GND

6. Arduino Nano

   • Description: Microcontroller used to control the circuit.
   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

7. 12V Relay

   • Description: Relay module used to switch the water pump.
   • Pins: NO, COM, NC, IN, DC-, DC+

8. Water Pump 12V

   • Description: Water pump powered by 12V.
   • Pins: +, -

9. 2.1mm DC Barrel Jack

   • Description: DC barrel jack for easy power connection.
   • Pins: switch, sleeve, center

Wiring Details

L298N DC Motor Driver

• 12V connected to Rocker Switch pin 2
• GND connected to Arduino Nano GND, Water Pump 12V -, 2.1mm DC Barrel Jack sleeve, Battery 12V -, HC-05 Bluetooth Module GND, 12V Relay DC-
• 5V connected to Arduino Nano VIN, 12V Relay DC+
• IN1 connected to Arduino Nano D11/MOSI
• IN2 connected to Arduino Nano D10
• IN3 connected to Arduino Nano D6
• IN4 connected to Arduino Nano D5
• OUT1 connected to Motor with Reducer 3 - 6 VCC (two motors)
• OUT2 connected to Motor with Reducer GND (two motors)
• OUT3 connected to Motor with Reducer 3 - 6 VCC (two motors)
• OUT4 connected to Motor with Reducer GND (two motors)

Battery 12V

• + connected to 2.1mm DC Barrel Jack center, Rocker Switch pin 1

Rocker Switch

• 1 connected to Battery 12V +
• 2 connected to L298N DC Motor Driver 12V

HC-05 Bluetooth Module

• RXD connected to Arduino Nano D1/TX
• TXD connected to Arduino Nano D0/RX
• VCC connected to Arduino Nano 5V
• GND connected to Arduino Nano GND, 12V Relay DC-

Motor with Reducer

• 3 - 6 VCC connected to L298N DC Motor Driver OUT1 (two motors), OUT3 (two motors)
• GND connected to L298N DC Motor Driver OUT2 (two motors), OUT4 (two motors)

Arduino Nano

• D1/TX connected to HC-05 Bluetooth Module RXD
• D0/RX connected to HC-05 Bluetooth Module TXD
• GND connected to L298N DC Motor Driver GND, Water Pump 12V -, 2.1mm DC Barrel Jack sleeve, Battery 12V -, HC-05 Bluetooth Module GND, 12V Relay DC-
• D5 connected to L298N DC Motor Driver IN4
• D6 connected to L298N DC Motor Driver IN3
• D8 connected to 12V Relay IN
• D10 connected to L298N DC Motor Driver IN2
• D11/MOSI connected to L298N DC Motor Driver IN1
• VIN connected to 12V Relay DC+
• 5V connected to HC-05 Bluetooth Module VCC

12V Relay

• IN connected to Arduino Nano D8
• DC+ connected to Arduino Nano VIN, L298N DC Motor Driver 5V
• DC- connected to Arduino Nano GND, HC-05 Bluetooth Module GND
• COM connected to 2.1mm DC Barrel Jack center, Rocker Switch pin 1, Battery 12V +
• NC connected to Water Pump 12V +

Water Pump 12V

• + connected to 12V Relay NC
• - connected to Arduino Nano GND, 2.1mm DC Barrel Jack sleeve, Battery 12V -, L298N DC Motor Driver GND

2.1mm DC Barrel Jack

• switch not connected
• sleeve connected to Arduino Nano GND, Water Pump 12V -, Battery 12V -, L298N DC Motor Driver GND
• center connected to 12V Relay COM, Rocker Switch pin 1, Battery 12V +

Documented Code

Arduino Nano Code (sketch.ino)

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

}

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

}

This code is a basic template for the Arduino Nano. The setup function is used to initialize any settings or configurations, and the loop function contains the main code that runs repeatedly.