Circuit Documentation

Summary

This circuit is designed to monitor soil moisture levels and control a water pump based on the moisture readings. It uses an ESP32 microcontroller to read data from a soil moisture sensor and display the readings on a 16x2 I2C LCD. Additionally, the ESP32 controls a 5V relay to activate a 5V mini water pump when the soil moisture level falls below a certain threshold.

Component List

1. SparkFun Soil Moisture Sensor

   • Pins: VCC, GND, SIG
   • Description: Measures the moisture level in the soil.

2. ESP32

   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, VIN, 3V3, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, BOOT
   • Description: Microcontroller used to read sensor data, control the relay, and display information on the LCD.

3. 16x2 I2C LCD

   • Pins: GND, VCC, SDA, SCL
   • Description: Displays the soil moisture readings.

4. 5V Relay

   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC
   • Description: Controls the power to the water pump based on the signal from the ESP32.

5. 5V Mini Water Pump

   • Pins: Positive pin, Negative pin
   • Description: Pumps water to the soil when activated.

6. Connector 5V

   • Pins: GND, VCC
   • Description: Provides 5V power supply to the circuit.

Wiring Details

SparkFun Soil Moisture Sensor

• VCC: Connected to VCC of the Connector 5V.
• GND: Connected to GND of the Connector 5V.
• SIG: Connected to VP of the ESP32.

ESP32

• VP: Connected to SIG of the SparkFun Soil Moisture Sensor.
• GND: Connected to GND of the Connector 5V.
• VIN: Connected to VCC of the Connector 5V.
• D13: Connected to In of the 5V Relay.
• D21: Connected to SDA of the 16x2 I2C LCD.
• D22: Connected to SCL of the 16x2 I2C LCD.

16x2 I2C LCD

• GND: Connected to GND of the Connector 5V.
• VCC: Connected to VCC of the Connector 5V.
• SDA: Connected to D21 of the ESP32.
• SCL: Connected to D22 of the ESP32.

5V Relay

• Common terminal: Connected to VCC of the Connector 5V.
• VCC: Connected to VCC of the Connector 5V.
• In: Connected to D13 of the ESP32.
• Normally Open: Connected to the positive pin of the 5V Mini Water Pump.

5V Mini Water Pump

• Positive pin: Connected to Normally Open of the 5V Relay.
• Negative pin: Connected to GND of the Connector 5V.

Connector 5V

• GND: Connected to GND of the ESP32, 5V Mini Water Pump, 16x2 I2C LCD, and SparkFun Soil Moisture Sensor.
• VCC: Connected to VIN of the ESP32, 5V Relay, 16x2 I2C LCD, and SparkFun Soil Moisture Sensor.

Code

No code is provided for this circuit.