Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an Arduino UNO microcontroller, an HC-SR04 Ultrasonic Sensor, a Piezo Buzzer, a SIM900A GSM module, a 16x2 I2C LCD, and a 5V Adapter. The circuit is designed to interface these components for various functionalities, including distance measurement, sound output, GSM communication, and display output.

Component List

Arduino UNO

• Description: A microcontroller board based on the ATmega328P.
• Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

HC-SR04 Ultrasonic Sensor

• Description: A sensor used for measuring distance using ultrasonic waves.
• Pins: VCC, TRIG, ECHO, GND

Piezo Buzzer

• Description: A device that produces sound when an electric signal is applied.
• Pins: pin 1, pin 2

SIM900A

• Description: A GSM module used for communication over the GSM network.
• Pins: GND, DB9-3 (RXD), DB9-2 (TXD), 5V, 3VR, 5VR, 3VT, 5VT, VCC, Ring, RESTART, RESET, STATUS

16x2 I2C LCD

• Description: A 16x2 character LCD display with I2C interface.
• Pins: GND, VCC, SDA, SCL

5V Adapter

• Description: A power adapter that provides a 5V output.
• Pins: AC In 1, AC In 2, 5V, GND

Wiring Details

Arduino UNO

• 5V connected to VCC of 16x2 I2C LCD and HC-SR04 Ultrasonic Sensor
• GND connected to GND of 16x2 I2C LCD, HC-SR04 Ultrasonic Sensor, and pin 1 of Piezo Buzzer
• A4 connected to SDA of 16x2 I2C LCD
• A5 connected to SCL of 16x2 I2C LCD
• D13 connected to pin 2 of Piezo Buzzer
• D10 connected to ECHO of HC-SR04 Ultrasonic Sensor
• D9 connected to TRIG of HC-SR04 Ultrasonic Sensor
• D3 connected to 5VR of SIM900A
• D2 connected to 5VT of SIM900A

HC-SR04 Ultrasonic Sensor

• VCC connected to 5V of Arduino UNO
• GND connected to GND of Arduino UNO
• ECHO connected to D10 of Arduino UNO
• TRIG connected to D9 of Arduino UNO

Piezo Buzzer

• pin 1 connected to GND of Arduino UNO
• pin 2 connected to D13 of Arduino UNO

SIM900A

• GND connected to GND of 5V Adapter
• 5V connected to 5V of 5V Adapter
• 5VR connected to D3 of Arduino UNO
• 5VT connected to D2 of Arduino UNO

16x2 I2C LCD

• VCC connected to 5V of Arduino UNO
• GND connected to GND of Arduino UNO
• SDA connected to A4 of Arduino UNO
• SCL connected to A5 of Arduino UNO

5V Adapter

• GND connected to GND of SIM900A
• 5V connected to 5V of SIM900A

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:

}

Additional Documentation (documentation.txt)

This document provides a comprehensive overview of the circuit, including the components used, their wiring details, and the code for the Arduino UNO microcontroller.