Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to control two DC Mini Metal Gear Motors using an Arduino UNO R4 WiFi and an L298N DC motor driver. The circuit is powered by a 3s 20A BMS connected to three 18650 Li-ion batteries, with a buck converter providing regulated power to a type C port.

Component List

L298N DC Motor Driver

• Description: Motor driver module used to control the speed and direction 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

Arduino UNO R4 WiFi

• Description: Microcontroller board based on the ATmega328P, with built-in WiFi capabilities.
• Pins: OFF, GND, VRTC, IIC0_SCL, IIC0_SDA, 3V3, GPIO 41, GPIO 0, GPIO 42, GPIO 43, GPIO 44, BOOT, IOREF, RESET, 5V, VIN, A0, A1, A2, A3, A4, A5, RSPCKA, CIPO, COPI, D0/RX, D1/TX, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, AREF, SDA, SCL

Buck Converter

• Description: DC-DC converter used to step down voltage.
• Pins: IN+, IN-, OUT+, OUT-

3s 20A BMS

• Description: Battery management system for 3-series Li-ion batteries.
• Pins: DV/GND, 4.2V, 8.4V, 12.6V, +, -

18650 Li-ion Battery

• Description: Rechargeable lithium-ion battery.
• Pins: -, +

DC Mini Metal Gear Motor

• Description: Small DC motor with metal gears for increased torque.
• Pins: IN1, IN2

Type C Port

• Description: USB Type-C port for power delivery.
• Pins: Negative, Positive

Wiring Details

L298N DC Motor Driver

• OUT1 connected to IN2 of DC Mini Metal Gear Motor
• OUT2 connected to IN1 of DC Mini Metal Gear Motor
• 12V connected to + of 3s 20A BMS and IN+ of Buck Converter
• GND connected to - of 3s 20A BMS and IN- of Buck Converter
• OUT3 connected to IN2 of DC Mini Metal Gear Motor
• OUT4 connected to IN1 of DC Mini Metal Gear Motor
• ENA connected to D6 of Arduino UNO R4 WiFi
• IN1 connected to D4 of Arduino UNO R4 WiFi
• IN2 connected to D7 of Arduino UNO R4 WiFi
• IN3 connected to D8 of Arduino UNO R4 WiFi
• IN4 connected to D9 of Arduino UNO R4 WiFi
• ENB connected to D5 of Arduino UNO R4 WiFi

Arduino UNO R4 WiFi

• D4 connected to IN1 of L298N DC Motor Driver
• D5 connected to ENB of L298N DC Motor Driver
• D6 connected to ENA of L298N DC Motor Driver
• D7 connected to IN2 of L298N DC Motor Driver
• D8 connected to IN3 of L298N DC Motor Driver
• D9 connected to IN4 of L298N DC Motor Driver

Buck Converter

• IN+ connected to + of 3s 20A BMS and 12V of L298N DC Motor Driver
• IN- connected to - of 3s 20A BMS and GND of L298N DC Motor Driver
• OUT+ connected to Positive of Type C Port
• OUT- connected to Negative of Type C Port

3s 20A BMS

• DV/GND connected to + of 18650 Li-ion Battery
• 4.2V connected to + of 18650 Li-ion Battery
• 8.4V connected to + of 18650 Li-ion Battery
• 12.6V connected to - of 18650 Li-ion Battery
• + connected to 12V of L298N DC Motor Driver and IN+ of Buck Converter
• - connected to GND of L298N DC Motor Driver and IN- of Buck Converter

18650 Li-ion Battery

• + connected to DV/GND of 3s 20A BMS
• + connected to 4.2V of 3s 20A BMS
• + connected to 8.4V of 3s 20A BMS
• - connected to 12.6V of 3s 20A BMS

DC Mini Metal Gear Motor

• IN1 connected to OUT2 of L298N DC Motor Driver
• IN2 connected to OUT1 of L298N DC Motor Driver
• IN1 connected to OUT4 of L298N DC Motor Driver
• IN2 connected to OUT3 of L298N DC Motor Driver

Type C Port

• Positive connected to OUT+ of Buck Converter
• Negative connected to OUT- of Buck Converter

Documented Code

Arduino UNO R4 WiFi Code

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 UNO R4 WiFi. The setup function is used to initialize any settings or configurations, and the loop function contains the main code that runs repeatedly.