Circuit Documentation

Summary

This circuit integrates various sensors and modules with an ESP32 microcontroller to create a comprehensive monitoring system. The system includes a gas sensor (MQ135), a vibration sensor (SW-420), a temperature and humidity sensor (DHT22), a weighing sensor module (HX711) connected to a load cell, a buzzer module for alerts, and a TP4056 module for battery management. The ESP32 serves as the central processing unit, interfacing with all the sensors and modules.

Component List

MQ135

• Description: Gas Sensor
• Pins: VCC, GND, A0, D0
• Purpose: Used to detect various gases including CO2, NH3, NOx, alcohol, benzene, smoke, and others.

TP4056

• Description: Lithium Battery Charger Module
• Pins: OUT-, B-, B+, OUT+, IN-, IN+
• Purpose: Used for charging and managing a 18650 Li-ion battery.

18650 Li-ion Battery

• Description: Rechargeable Lithium-Ion Battery
• Pins: -, +
• Purpose: Provides power to the circuit.

Load Cell - Red/white/black/green

• Description: Load Cell
• Pins: E+, A-, E-, A+
• Purpose: Measures weight and force.

SW-420 Vibration Sensor

• Description: Vibration Sensor
• Pins: vcc, Ground, Digital output
• Purpose: Detects vibrations and shocks.

HX711 Weighing Sensor Module

• Description: Weighing Sensor Module
• Pins: B-, B+, A-, A+, E-, E+, VCC, CK/TX, DO/RX, GND
• Purpose: Amplifies the signal from the load cell and interfaces with the microcontroller.

DHT22

• Description: Temperature and Humidity Sensor
• Pins: GND, VCC, DAT
• Purpose: Measures temperature and humidity.

ESP32 (30 pin)

• Description: Microcontroller
• Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3
• Purpose: Central processing unit that interfaces with all sensors and modules.

Buzzer Module

• Description: Buzzer
• Pins: GND, Vcc, I/O
• Purpose: Provides audible alerts.

Wiring Details

MQ135

• VCC: Connected to ESP32 (3V3)
• GND: Connected to ESP32 (GND)
• A0: Connected to ESP32 (D32)

TP4056

• OUT-: Connected to ESP32 (VN)
• B-: Connected to 18650 Li-ion Battery (+)
• B+: Connected to 18650 Li-ion Battery (-)
• OUT+: Connected to ESP32 (GND)

18650 Li-ion Battery

• +: Connected to TP4056 (B-)
• -: Connected to TP4056 (B+)

Load Cell - Red/white/black/green

• E+: Not connected
• A-: Not connected
• E-: Not connected
• A+: Not connected

SW-420 Vibration Sensor

• vcc: Connected to ESP32 (3V3)
• Ground: Connected to ESP32 (GND)
• Digital output: Connected to ESP32 (D5)

HX711 Weighing Sensor Module

• VCC: Connected to ESP32 (3V3)
• GND: Connected to ESP32 (GND)
• CK/TX: Connected to ESP32 (D22)
• DO/RX: Connected to ESP32 (D21)

DHT22

• VCC: Connected to ESP32 (3V3)
• GND: Connected to ESP32 (GND)
• DAT: Connected to ESP32 (D4)

ESP32 (30 pin)

• 3V3: Connected to VCC of MQ135, HX711, DHT22, SW-420, Buzzer Module
• GND: Connected to GND of MQ135, HX711, DHT22, SW-420, Buzzer Module, TP4056 (OUT+)
• D32: Connected to MQ135 (A0)
• VN: Connected to TP4056 (OUT-)
• D5: Connected to SW-420 (Digital output)
• D22: Connected to HX711 (CK/TX)
• D21: Connected to HX711 (DO/RX)
• D4: Connected to DHT22 (DAT)
• D23: Connected to Buzzer Module (I/O)

Buzzer Module

• Vcc: Connected to ESP32 (3V3)
• GND: Connected to ESP32 (GND)
• I/O: Connected to ESP32 (D23)

Code

No code provided.