Circuit Documentation

Summary

The circuit in question is designed to interface an Arduino UNO microcontroller with a pair of HC-SR04 Ultrasonic Sensors and two Hobby Gearmotors through an L298N DC motor driver. The system is powered by a Li-ion battery. The Arduino UNO is responsible for controlling the motors based on the input from the ultrasonic sensors, which are used for distance measurement.

Component List

Li-ion Battery, 2200 mAh 11.1 V

• Description: A rechargeable battery that provides the main power source for the circuit.
• Pins: + (Positive), - (Negative)

Hobby Gearmotor with 48:1 Gearbox (2 units)

• Description: Electric motors with a gearbox used for driving the mechanical parts of the system.
• Pins: pin 1, pin 2

HC-SR04 Ultrasonic Sensor (3 units)

• Description: Ultrasonic range-finding sensors that measure distance by emitting ultrasonic waves and measuring the time taken for the echo to return.
• Pins: VCC, TRIG, ECHO, GND

Arduino UNO (2 units)

• Description: Microcontroller boards based on the ATmega328P, used for processing and controlling the logic of the circuit.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0 to A5, SCL, SDA, AREF, D0 to D13

L298N DC Motor Driver

• Description: A motor driver module that allows the microcontroller to control 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

Wiring Details

Li-ion Battery, 2200 mAh 11.1 V

• + connected to L298N DC motor driver 12V
• - connected to common ground net

Hobby Gearmotor with 48:1 Gearbox

• pin 1 connected to L298N DC motor driver OUT1 or OUT4
• pin 2 connected to L298N DC motor driver OUT2 or OUT3

HC-SR04 Ultrasonic Sensor

• VCC connected to Arduino UNO 5V
• TRIG connected to Arduino UNO digital pins (D8, D10, D12)
• ECHO connected to Arduino UNO digital pins (D9, D11, D13)
• GND connected to common ground net

Arduino UNO

• GND connected to common ground net
• 5V connected to HC-SR04 VCC and L298N DC motor driver 5V
• Digital pins (D1, D2, D3, D4, D5, D6, D8, D9, D10, D11, D12, D13) connected to L298N DC motor driver control pins (IN1, IN2, IN3, IN4, ENA, ENB) and HC-SR04 TRIG and ECHO pins

L298N DC Motor Driver

• OUT1, OUT2, OUT3, OUT4 connected to Hobby Gearmotor pins
• 12V connected to Li-ion battery +
• GND connected to common ground net
• 5V connected to Arduino UNO 5V
• Control pins (ENA, ENB, IN1, IN2, IN3, IN4) connected to Arduino UNO digital pins

Documented Code

Arduino UNO (First Instance)

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

}

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

}

Arduino UNO (Second Instance)

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

}

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

}

Note: The provided code for both Arduino UNO instances is a template and does not contain any functional code specific to the operation of the circuit. The actual implementation should include initialization of the pins, setup of the motor driver, and logic for reading the ultrasonic sensors and controlling the motors accordingly.