Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed around an Arduino UNO microcontroller. The circuit includes various components such as LEDs, a buzzer, an LCD I2C display, a force sensing resistor, an MQ-3 alcohol sensor, and an HC-05 Bluetooth module. The circuit is designed to interface with these components, allowing for a range of functionalities such as visual feedback through LEDs, auditory signaling through a buzzer, data display on an LCD, and wireless communication via Bluetooth.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• It has 14 digital input/output pins, 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and a reset button.

Buzzer

• An electromechanical component that produces sound
• Typically used for audible alerts or alarms.

LED: Two Pin (Red)

• A red light-emitting diode
• Used as an indicator light.

LED: Two Pin (Green)

• A green light-emitting diode
• Used as an indicator light.

LCD I2C Display

• A liquid crystal display with an I2C interface
• Used for displaying text and numbers.

Force Sensing Resistor

• A sensor that changes its resistance based on the force applied to its surface
• Used for sensing pressure or force.

MQ-3 Breakout

• An alcohol sensor module
• Used for detecting alcohol levels in the breath.

HC-05 Bluetooth Module

• A wireless communication module
• Used for Bluetooth connectivity with other devices.

Resistor (200 Ohms)

• A passive two-terminal electrical component
• Used to limit current or divide voltages.

Resistor (100 Ohms)

• Similar to the 200 Ohms resistor but with a lower resistance value.

Wiring Details

Arduino UNO

• Digital Pin D4 connected to Red LED anode through a 200 Ohms resistor
• Analog Pin A0 connected to one end of a 200 Ohms resistor, the other end connected to a Force Sensing Resistor
• Digital Pins D8, D9, D10, D11, D12 connected to Green LEDs anodes through 200 Ohms resistors
• Digital Pin D0 connected to one end of a 100 Ohms resistor
• Digital Pin D1 connected to TXD of HC-05 Bluetooth Module
• Digital Pin D2 connected to DO of MQ-3 Breakout
• Digital Pin D7 connected to Buzzer PIN
• Analog Pin A1 connected to AO of MQ-3 Breakout
• Analog Pins A4, A5 connected to SDA, SCL of LCD I2C Display respectively
• 5V and GND pins provide power to various components

Buzzer

• PIN connected to Digital Pin D7 of Arduino UNO
• GND connected to common ground

Red LED

• Anode connected to Digital Pin D4 of Arduino UNO through a 200 Ohms resistor
• Cathode connected to common ground

Green LEDs

• Anodes connected to Digital Pins D8, D9, D10, D11, D12 of Arduino UNO through 200 Ohms resistors
• Cathodes connected to common ground

LCD I2C Display

• VCC connected to 5V of Arduino UNO
• GND connected to common ground
• SDA connected to Analog Pin A4 of Arduino UNO
• SCL connected to Analog Pin A5 of Arduino UNO

Force Sensing Resistor

• One end connected to Analog Pin A0 of Arduino UNO through a 200 Ohms resistor
• The other end left unconnected (floating)

MQ-3 Breakout

• VCC connected to 5V of Arduino UNO
• GND connected to common ground
• DO connected to Digital Pin D2 of Arduino UNO
• AO connected to Analog Pin A1 of Arduino UNO

HC-05 Bluetooth Module

• VCC connected to 5V of Arduino UNO
• GND connected to common ground
• TXD connected to Digital Pin D1 of Arduino UNO
• State connected to one end of a 100 Ohms resistor, the other end connected to a 200 Ohms resistor and common ground

Resistor (200 Ohms)

• Used in series with LEDs and for pull-down configurations

Resistor (100 Ohms)

• Used in series with the State pin of HC-05 Bluetooth Module

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:

}

Note: The provided code is a template and does not include any functionality. It needs to be populated with the logic to control the components based on the requirements of the circuit's application.