Circuit Documentation

Summary

The circuit described by the provided inputs is a control circuit that utilizes a relay to switch between two different outputs based on the signal from an MQ-3 alcohol sensor. The circuit includes a voltage regulator to ensure stable operation, a transistor to amplify the sensor's signal, and protection diodes. It also features visual indicators in the form of LEDs and an audible indicator using a piezo buzzer.

Component List

Relay 5V

• Description: A 5V relay used to switch between two different outputs.
• Pins: COM (Common), COIL 1, COIL 2, NO (Normally Open), NC (Normally Closed)

Resistor (1k Ohms)

• Description: A resistor with a resistance of 1000 Ohms.
• Pins: pin1, pin2

Voltage Regulator

• Description: A voltage regulator to maintain a stable voltage level for the circuit.
• Pins: IN (Input), GND (Ground), OUT (Output)

9V Battery

• Description: A 9V battery providing the power source for the circuit.
• Pins: + (Positive), - (Negative)

NPN Transistor (EBC)

• Description: An NPN transistor used to amplify the signal from the MQ-3 sensor.
• Pins: emitter, base, collector

Diode

• Description: A diode used for protecting the circuit from reverse voltage spikes.
• Pins: cathode, anode

Piezo Buzzer

• Description: An audible indicator that can be triggered by the circuit.
• Pins: pin 1, pin 2

MQ-3 Breakout

• Description: An alcohol sensor that outputs a digital signal.
• Pins: VCC (Power), GND (Ground), DO (Digital Output), AO (Analog Output)

LED: Two Pin (red)

• Description: A red LED used as a visual indicator.
• Pins: cathode, anode

LED: Two Pin (green)

• Description: A green LED used as a visual indicator.
• Pins: cathode, anode

Resistor (68 Ohms)

• Description: A resistor with a resistance of 68 Ohms, likely used to limit current to the LEDs.
• Pins: pin1, pin2

Wiring Details

Relay 5V

• COM connected to Voltage Regulator OUT
• COIL 1 connected to NPN Transistor emitter
• COIL 2 connected to Voltage Regulator OUT
• NO connected to LED: Two Pin (green) anode
• NC connected to LED: Two Pin (red) anode and Piezo Buzzer pin 1

Resistor (1k Ohms)

• pin1 connected to NPN Transistor base
• pin2 connected to MQ-3 Breakout DO

Voltage Regulator

• IN connected to 9V Battery +
• GND connected to 9V Battery -, Piezo Buzzer pin 2, MQ-3 Breakout GND, and common ground for other components
• OUT connected to Relay 5V COIL 2 and Diode cathode

9V Battery

• • connected to Voltage Regulator IN
• • connected to common ground

NPN Transistor (EBC)

• emitter connected to Relay 5V COIL 1
• base connected to Resistor (1k Ohms) pin1
• collector connected to common ground

Diode

• cathode connected to Voltage Regulator OUT
• anode connected to NPN Transistor emitter

Piezo Buzzer

• pin 1 connected to Relay 5V NC
• pin 2 connected to common ground

MQ-3 Breakout

• VCC connected to Voltage Regulator OUT
• GND connected to common ground
• DO connected to Resistor (1k Ohms) pin2

LED: Two Pin (red)

• anode connected to Relay 5V NC
• cathode connected to Resistor (68 Ohms) pin1

LED: Two Pin (green)

• anode connected to Relay 5V NO
• cathode connected to Resistor (68 Ohms) pin1

Resistor (68 Ohms)

• pin1 connected to LED: Two Pin (red) cathode and LED: Two Pin (green) cathode
• pin2 connected to common ground

Documented Code

No code was provided for any microcontrollers in the circuit. If there are microcontrollers involved, please provide the relevant code for documentation.