Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino Nano microcontroller, an L298N DC motor driver, a hobby gearmotor, a green LED, a 7805 voltage regulator, and several terminal PCB connectors. The circuit is powered by two 3.7V batteries and is designed to control a motor and an LED.

Component List

Arduino Nano

• Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
• 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

Terminal PCB 2 Pin

• Description: A simple 2-pin terminal block for easy connection and disconnection of wires.
• Pins: Pin A, Pin B

Hobby Gearmotor with 48:1 Gearbox

• Description: A small DC motor with a 48:1 gearbox for increased torque.
• Pins: pin 1, pin 2

7805 Voltage Regulator

• Description: A voltage regulator that outputs a stable 5V from a higher input voltage.
• Pins: Vin, Gnd, Vout

L298N DC Motor Driver

• Description: A dual H-bridge motor driver that allows control of the speed and direction of two 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

LED: Two Pin (Green)

• Description: A green LED with two pins for indicating status.
• Pins: cathode, anode

3.7V Battery

• Description: A rechargeable lithium-ion battery with a nominal voltage of 3.7V.
• Pins: +, -

Wiring Details

Arduino Nano

• GND is connected to the cathode of the green LED and Pin B of a terminal PCB 2 pin.
• D3 is connected to the anode of the green LED and Pin A of a terminal PCB 2 pin.
• D5 is connected to IN2 of the L298N DC motor driver and Pin B of a terminal PCB 2 pin.
• D7 is connected to IN1 of the L298N DC motor driver and Pin A of a terminal PCB 2 pin.
• VIN is connected to 12V of the L298N DC motor driver, Vout of the 7805 voltage regulator, and Pin B of a terminal PCB 2 pin.
• GND is connected to GND of the L298N DC motor driver, - of a 3.7V battery, Gnd of the 7805 voltage regulator, Pin B of a terminal PCB 2 pin, and Pin A of another terminal PCB 2 pin.

Terminal PCB 2 Pin

• Pin A is connected to anode of the green LED and D3 of the Arduino Nano.
• Pin B is connected to cathode of the green LED and GND of the Arduino Nano.
• Pin A is connected to IN1 of the L298N DC motor driver and D7 of the Arduino Nano.
• Pin B is connected to IN2 of the L298N DC motor driver and D5 of the Arduino Nano.
• Pin B is connected to 12V of the L298N DC motor driver, VIN of the Arduino Nano, and Vout of the 7805 voltage regulator.
• Pin B is connected to GND of the L298N DC motor driver, GND of the Arduino Nano, - of a 3.7V battery, Gnd of the 7805 voltage regulator, and Pin A of another terminal PCB 2 pin.
• Pin A is connected to Vin of the 7805 voltage regulator and + of a 3.7V battery.

Hobby Gearmotor with 48:1 Gearbox

• pin 1 is connected to OUT2 of the L298N DC motor driver.
• pin 2 is connected to OUT1 of the L298N DC motor driver.

7805 Voltage Regulator

• Vin is connected to + of a 3.7V battery and Pin A of a terminal PCB 2 pin.
• Gnd is connected to GND of the L298N DC motor driver, GND of the Arduino Nano, - of a 3.7V battery, Pin B of a terminal PCB 2 pin, and Pin A of another terminal PCB 2 pin.
• Vout is connected to 12V of the L298N DC motor driver, VIN of the Arduino Nano, and Pin B of a terminal PCB 2 pin.

L298N DC Motor Driver

• IN2 is connected to D5 of the Arduino Nano and Pin B of a terminal PCB 2 pin.
• IN1 is connected to D7 of the Arduino Nano and Pin A of a terminal PCB 2 pin.
• 12V is connected to VIN of the Arduino Nano, Vout of the 7805 voltage regulator, and Pin B of a terminal PCB 2 pin.
• GND is connected to GND of the Arduino Nano, - of a 3.7V battery, Gnd of the 7805 voltage regulator, Pin B of a terminal PCB 2 pin, and Pin A of another terminal PCB 2 pin.
• OUT1 is connected to pin 2 of the hobby gearmotor.
• OUT2 is connected to pin 1 of the hobby gearmotor.
• 5V-ENA-JMP-I is connected to 5V-ENA-JMP-O.
• ENA is connected to +5V-J1.

LED: Two Pin (Green)

• cathode is connected to GND of the Arduino Nano and Pin B of a terminal PCB 2 pin.
• anode is connected to D3 of the Arduino Nano and Pin A of a terminal PCB 2 pin.

3.7V Battery

• + is connected to Vin of the 7805 voltage regulator and Pin A of a terminal PCB 2 pin.
• - is connected to GND of the L298N DC motor driver, GND of the Arduino Nano, Gnd of the 7805 voltage regulator, Pin B of a terminal PCB 2 pin, and Pin A of another terminal PCB 2 pin.
• + of one battery is connected to - of the other battery.

Code Documentation

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:

}

documentation.txt