This Smart Sensor PCB is designed to integrate multiple sensors with an ESP32-DevKit-V1, allowing real-time environmental monitoring and data collection. It includes connections for:

• DHT22 (Temperature & Humidity Sensor)
• I2C CO₂ Sensor (Air Quality Monitoring)
• Ultrasonic Sensor (Distance Measurement)
• ESP32-CAM (Wireless Image/Video Capture)

The PCB provides stable power distribution, sensor interfaces, and efficient communication channels using I2C, UART, and GPIO.

Features of Smart Sensor PCB Design:

Multiple Sensor Support – Easily interface DHT22, CO₂ sensor, ultrasonic sensor, and ESP32-CAM.
Wi-Fi & Bluetooth Connectivity – Use ESP32 for cloud communication and remote access.
Stable Power Management – DC input with regulated power for all components.
Compact & Modular Design – Optimized for IoT applications, with headers for future expansion.

Components used in Smart Sensor PCB Design:

(A) Microcontroller Unit

• ESP32-DevKit-V1
  • Acts as the main controller for all sensors.
  • Communicates wirelessly via Wi-Fi or Bluetooth.
  • Controls the ESP32-CAM for capturing images.
  • Manages sensor data and uploads it to a cloud or local server.

(B) Power Supply & Connectors

• DC-005-2.5A-2.0 (DC Jack)
  • Power input connector to supply 5V or 12V (converted to 3.3V for ESP32).
  • Ensures stable voltage distribution to sensors.
• HDR-TH_15P-P2.54-V-F (Pin Header – 15 Pin, 2.54mm pitch)
  • Provides easy connections for external sensors and modules.
  • Allows additional I/O expansion if needed.
• S4B-PH-K-S-(LF)(SN) (4-Pin Connector)
  • A 4-pin JST connector used for connecting the I2C CO₂ sensor or other modules.

(C) Resistors & Other Components

• 12kΩ Resistor
  • Used as a pull-up resistor for the I2C communication lines or sensor input stabilization.
• 470Ω Resistor
  • Used for current limiting in LEDs or signal conditioning.
• GT-TCB73B-H048-L1 (Tactile Push Button)
  • Can be used as a reset button for ESP32 or as a manual trigger for sensor readings.

Working of the Smart Sensor PCB:

(A) Power Distribution

• The DC-005 connector receives external power (typically 5V or 12V).
• The ESP32 operates at 3.3V, so a voltage regulator is used internally.
• Sensors like the DHT22, I2C CO₂ sensor, and Ultrasonic Sensor receive their required operating voltage from the PCB.

(B) Sensor Connections

1. DHT22 Sensor (Temperature & Humidity)
   • Connected to a GPIO pin of the ESP32 for single-wire communication.
2. I2C CO₂ Sensor (Air Quality Monitoring)
   • Connected via I2C pins (SDA, SCL) using the S4B-PH-K-S connector.
3. Ultrasonic Sensor (Distance Measurement)
   • Connected to two GPIO pins (Trigger & Echo) for measuring distance.
4. ESP32-CAM Module
   • Communicates with the ESP32-DevKit-V1 via UART for image and video streaming.

(C) Data Processing & Communication

• The ESP32 collects sensor data and sends it via Wi-Fi or Bluetooth to a cloud platform (e.g., Blynk, Thingspeak, Firebase).
• It can also store the data locally on an SD card (if added to the design).
• The ESP32-CAM captures images and streams them to a smartphone or web dashboard.

Applications of Smart Sensor PCB Project:

Environmental Monitoring – Monitor temperature, humidity, CO₂ levels, and distance remotely.
Smart Home & IoT – Automate indoor climate control based on sensor readings.
Security & Surveillance – ESP32-CAM provides remote monitoring capabilities.
Industrial Use – Measure air quality in factories or warehouses

Conclusion:

This ESP32-Based Multi-Sensor PCB is a compact and efficient IoT solution for monitoring environmental conditions with real-time data logging and wireless control.

Would you like assistance with the PCB schematic, firmware programming, or mobile app integration?