Circuit Documentation

Summary of the Circuit

This circuit is designed to monitor soil moisture levels and control a water pump based on the sensor data. It uses an ESP32 microcontroller to read data from a DHT11 temperature and humidity sensor and an MKE-S13 soil moisture sensor. The ESP32 also controls a relay module, which in turn controls the power to a water pump. The MB102 Breadboard Power Supply Module provides the necessary power to the components.

Component List

MKE-S13 Soil Moisture Sensor

• Description: A sensor that measures the volumetric content of water in the soil and outputs an analog signal.
• Pins: GND, 5V, SIG

MB102 Breadboard Power Supply Module 3.3V/5V

• Description: A power supply module that provides both 3.3V and 5V outputs for breadboard projects.
• Pins: GND, 3.3V, 5V

DHT11 Temperature and Humidity Sensor

• Description: A basic, ultra low-cost digital temperature and humidity sensor.
• Pins: DATA, GND, VCC

Relay Module 1 Channel

• Description: A module that allows a low-power signal from the microcontroller to control higher power circuits, such as a water pump.
• Pins: S, 5V, GND, NC, COM, NO

Water Pump

• Description: An electric pump that moves water from one place to another.
• Pins: Positive, Negative

ESP32-WROOM-32UE Microcontroller

• Description: A powerful microcontroller with Wi-Fi and Bluetooth capabilities, suitable for a wide range of applications.
• Pins: 3v3, EN, VP, VN, 34, 35, 32, 33, 25, 26, 27, 14, 12, GND, 13, D2, D3, 5V, 23, 22, TX, RX, 21, 19, 18, 5, 17, 16, 4, 0, 2, 15, D1, D0, CKL

Wiring Details

MKE-S13 Soil Moisture Sensor

• 5V: Connected to the 3.3V output from the MB102 Power Supply Module.
• GND: Connected to the common ground.
• SIG: Connected to pin 34 on the ESP32.

MB102 Breadboard Power Supply Module 3.3V/5V

• 3.3V: Provides power to the ESP32, DHT11, and MKE-S13 Soil Moisture Sensor.
• 5V: Provides power to the Relay Module.
• GND: Common ground for all components.

DHT11 Temperature and Humidity Sensor

• VCC: Connected to the 3.3V output from the MB102 Power Supply Module.
• GND: Connected to the common ground.
• DATA: Connected to pin 27 on the ESP32.

Relay Module 1 Channel

• 5V: Connected to the 5V output from the MB102 Power Supply Module.
• GND: Connected to the common ground.
• S: Signal pin connected to pin 26 on the ESP32.
• COM: Common pin, connected to the 5V output from the MB102 Power Supply Module.
• NO: Normally open pin, connected to the positive pin of the water pump.

Water Pump

• Positive: Connected to the NO pin on the Relay Module.
• Negative: Connected to the common ground.

ESP32-WROOM-32UE Microcontroller

• 3v3: Provides power to the DHT11 and MKE-S13 Soil Moisture Sensor.
• GND: Common ground for all components.
• Pins 26, 27, 34: Connected to the Relay Module, DHT11, and MKE-S13 Soil Moisture Sensor respectively.

Documented Code

DHT11 Sensor Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Additional Documentation (documentation.txt)

No additional code documentation provided.