Circuit Documentation

Summary

This circuit is designed to control a set of DC motors and a water pump using an Arduino UNO microcontroller. The circuit includes a Bluetooth module for wireless communication, a motor driver to handle motor control signals from the Arduino, relays for switching high-power devices, and a rocker switch as a manual control interface. The circuit is powered by a 12V battery, and it includes a green LED indicator with a current-limiting resistor.

Component List

HC-05 Bluetooth Module

• A Bluetooth module for wireless communication with the microcontroller.

DC Motors

• Three DC motors are included in the circuit for various mechanical movements.

Water Pump 12V

• A 12V water pump used for pumping water.

Resistor (220 Ohms)

• A resistor with a resistance of 220 Ohms, likely used for current limiting for the LED.

LED: Two Pin (green)

• A green LED used as an indicator light.

Rocker Switch

• A manual switch to control the power flow in the circuit.

Arduino UNO

• A microcontroller board based on the ATmega328P, used for controlling the various components in the circuit.

L298N DC Motor Driver

• A motor driver module used to control the speed and direction of the DC motors.

12V Battery

• A power source for the circuit.

12V Relays

• Two relays used for switching higher power circuits with the microcontroller.

Wiring Details

HC-05 Bluetooth Module

• VCC connected to Arduino UNO 5V
• GND connected to common ground
• TXD connected to Arduino UNO D2
• RXD connected to Arduino UNO D3

DC Motors

• Motor 1 connected to L298N DC motor driver OUT1 and OUT2
• Motor 2 connected to L298N DC motor driver OUT3 and OUT4
• Motor 3 connected to 12V Relay COM (one of the relays)

Water Pump 12V

• Positive terminal connected to 12V Relay COM (the other relay)
• Negative terminal connected to common ground

Resistor (220 Ohms)

• One side connected to Arduino UNO GND
• The other side connected to the cathode of the green LED

LED: Two Pin (green)

• Anode connected to Arduino UNO D13
• Cathode connected to 220 Ohms resistor

Rocker Switch

• Input connected to 12V Battery positive terminal
• Output connected to L298N DC motor driver 12V and both 12V Relays NC

Arduino UNO

• GND connected to common ground
• 5V connected to HC-05 Bluetooth Module VCC and both 12V Relays DC+
• D13 connected to the anode of the green LED
• D12 and D11 connected to the IN pins of the 12V Relays
• D9 and D8 connected to L298N DC motor driver ENB and ENA
• D7 and D6 connected to L298N DC motor driver IN4 and IN3
• D5 and D4 connected to L298N DC motor driver IN2 and IN1
• D3 and D2 connected to HC-05 Bluetooth Module RXD and TXD

L298N DC Motor Driver

• 12V connected to Rocker Switch output
• GND connected to common ground
• 5V connected to Arduino UNO 5V
• Motor outputs connected to DC Motors as described above
• Control inputs connected to corresponding Arduino UNO pins

12V Battery

• Positive terminal connected to Rocker Switch input
• Negative terminal connected to common ground

12V Relays

• DC+ connected to Arduino UNO 5V
• DC- connected to common ground
• IN connected to Arduino UNO D12 and D11
• COM connected to DC Motor 3 and Water Pump 12V
• NC connected to L298N DC motor driver 12V

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 contain any functional code. It needs to be populated with the logic to control the motors, read Bluetooth commands, and manage the relay states.