Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to interface with various components including an Arduino UNO, a Tower Pro SG90 servo, gearmotors, an HC-SR04 Ultrasonic Sensor, an L293D driver shield, a power source (2x 18650 batteries), a rocker switch, an LED, a piezo speaker, resistors, and a photocell (LDR). The circuit is designed to control motors, read sensor inputs, and provide visual and auditory feedback.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0-A5, SCL, SDA, AREF, D0-D13

Tower Pro SG90 Servo

• Small and lightweight servo motor
• Pins: Signal, +5V, GND

Gearmotor DC Wheels (Right and Left)

• DC motors with gear reduction used for driving wheels
• Pins: PIN1, PIN2

2x 18650 Batteries

• Power source for the circuit
• Pins: VCC, GND

HC-SR04 Ultrasonic Sensor

• Ultrasonic distance sensor
• Pins: VCC, TRIG, ECHO, GND

L293D Driver Shield

• Motor driver shield for controlling multiple motors
• Pins: 5V, GND, A0-A5, M+, M1-M4, 0-12, Aref, Servo1, Servo2, +, -, 9V

Rocker Switch (SPST)

• Single Pole Single Throw switch
• Pins: 1, 2

LED: Two Pin (Red)

• Red light-emitting diode
• Pins: Cathode, Anode

Piezo Speaker

• Electronic device that can produce sound
• Pins: Pin1, Pin2

Resistor

• Electrical component that limits or regulates the flow of electrical current
• Resistance: 200 Ohms

Photocell (LDR)

• Light-dependent resistor whose resistance changes with light intensity
• Pins: Pin 0, Pin 1

Wiring Details

Arduino UNO

• No direct wiring information provided.

Tower Pro SG90 Servo

• Signal connected to L293D Driver Shield (Servo1)
• +5V connected to L293D Driver Shield (+)
• GND connected to L293D Driver Shield (-)

Gearmotor DC Wheels (Right and Left)

• PIN1 and PIN2 of each motor connected to corresponding M1-M4 pins on L293D Driver Shield

2x 18650 Batteries

• VCC connected to Rocker Switch (Pin 1)
• GND connected to L293D Driver Shield (GND)

HC-SR04 Ultrasonic Sensor

• VCC connected to L293D Driver Shield (5V)
• TRIG connected to L293D Driver Shield (Pin 2)
• ECHO connected to L293D Driver Shield (Pin 12)
• GND connected to L293D Driver Shield (GND)

L293D Driver Shield

• 5V and GND used for power distribution
• A0-A5, M+, M1-M4, 0-12, Servo1, Servo2, +, -, 9V used for interfacing with other components

Rocker Switch (SPST)

• Pin 1 connected to 2x 18650 Batteries (VCC)
• Pin 2 connected to L293D Driver Shield (M+)

LED: Two Pin (Red)

• Cathode connected to L293D Driver Shield (GND) through a 200 Ohm resistor
• Anode connected to L293D Driver Shield (Pin 8)

Piezo Speaker

• Pin1 connected to L293D Driver Shield (Pin 12)
• Pin2 connected to L293D Driver Shield (GND) through a 200 Ohm resistor

Resistor (200 Ohms)

• One resistor connected between Photocell (LDR) Pin 0 and L293D Driver Shield (A1)
• Another resistor connected between LED Cathode and L293D Driver Shield (GND)

Photocell (LDR)

• Pin 1 connected to L293D Driver Shield (5V)
• Pin 0 connected to L293D Driver Shield (A1) through a 200 Ohm resistor

Documented Code

Arduino UNO Sketch (sketch.ino)

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

}

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

}

Additional Notes

• The provided code is a template and does not contain any functional code specific to the circuit's operation.
• Further implementation is required to control the motors, read sensor inputs, and activate the LED and piezo speaker based on the circuit's logic.