ESP-32s Project with Arduino and PlatformIO

This project consists of an ESP-32s that uses Arduino libraries to receive data (temperature, air/soil humidity, and light intensity) from sensors and send it to an MQTT server on Ubidots. PlatformIO is used as the integrated development environment (IDE).

Features

• Temperature and Humidity Monitoring: Uses the DHT11 sensor to monitor the temperature and air humidity.
• Soil Moisture Monitoring: Monitors soil moisture using a capacitive soil moisture sensor.
• Light Intensity Monitoring: Measures light intensity with a photoresistor.
• Automated Climate Control: Controls fans based on temperature and air humidity, and controls a water pump based on soil moisture levels.
• Remote Control: Fans and water pumps can be remotely controlled via MQTT topics through the Ubidots platform.
• Parallel Tasks: Each sensor runs in its own FreeRTOS task to ensure efficient monitoring.
• MQTT Data Transmission: Data is sent to Ubidots through MQTT for real-time monitoring and control.

Before start

Before compiling the project, you must create a file named wifi_credentials.h with the following defined macros:

#define WIFI_SSID_SECRETS "<Network Name>"
#define WIFI_PASSWORD_SECRETS "<Password>"
#define UBIDOTS_TOKEN_SECRETS "<Ubidots Token>"
#define DEVICE_LABEL_SECRETS "<Device name>"

| ⚠️ Make sure to replace the example values with your own data before compiling.

Components

• Microcontroller: ESP32
• Temperature and Humidity Sensor: DHT11
• Soil Moisture Sensor: Capacitive soil moisture sensor (analog)
• Light Intensity Sensor: Photoresistor (analog)
• Fan and Water Pump: Connected to ESP32 for climate control

Pin Configuration

Component	ESP32 Pin
DHT11 Sensor	GPIO 4
Soil Moisture	GPIO 34
Light Sensor	GPIO 35
Fan	GPIO 12
Water Pump	GPIO 14

Sensor Sampling Intervals

• Temperature and Humidity: 10 minutes
• Soil Moisture: 15 minutes
• Light Intensity: 15 minutes

Ubidots Setup

• The system connects to Ubidots using MQTT to publish sensor data and subscribe to actuator control topics.
• Ensure that the following variables are configured in your Ubidots dashboard:
  • temperature: for temperature readings.
  • air_humidity: for air humidity readings.
  • light: for light intensity readings.
  • soil_humidity: for soil moisture readings.
  • fan: for controlling the fan remotely.
  • water_pump: for controlling the water pump remotely.

Code Overview

Dependencies

Make sure to include the following libraries in your project:

• Ubidots Arduino MQTT
• Adafruit Unified Sensor
• Adafruit DHT
• Arduino

References

• Connect an ESP32-DevKitC to Ubidots over MQTT