Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to monitor soil moisture levels and control a water pump based on the moisture readings. The circuit utilizes an ESP32 microcontroller, a capacitive soil moisture sensor, a relay module, a 5V mini water pump, and a 5V adapter. The ESP32 reads the soil moisture levels and controls the relay to activate the water pump when necessary.

Component List

1. ESP32 - 38 pins

   • Description: A versatile microcontroller with Wi-Fi and Bluetooth capabilities.
   • Pins: 3V3, EN, SP, SN, G34, G35, G32, G33, G25, G26, G27, G14, G12, GND, G13, SD2, SD3, CMD, 5V, G23, G22, TXD, RXD, G21, G19, G18, G5, G17, G16, G4, G0, G2, G15, SD1, SD0, CLK

2. Capacitive Soil Moisture Sensor V1.2

   • Description: A sensor that measures soil moisture levels.
   • Pins: GND, VCC, AOUT

3. KF-301 Relay

   • Description: A relay module used to control high-power devices.
   • Pins: signal, power, ground, NC, C, NO

4. 5V Mini Water Pump

   • Description: A small water pump powered by 5V.
   • Pins: positive pin, negative pin

5. 5V Adapter

   • Description: A power adapter that provides 5V output.
   • Pins: AC In 1, AC In 2, 5V, GND

Wiring Details

ESP32 - 38 pins

• 3V3: Connected to VCC of the Capacitive Soil Moisture Sensor.
• GND: Connected to GND of the Capacitive Soil Moisture Sensor and ground of the KF-301 Relay.
• 5V: Connected to power of the KF-301 Relay.
• G17: Connected to signal of the KF-301 Relay.
• G16: Connected to AOUT of the Capacitive Soil Moisture Sensor.

Capacitive Soil Moisture Sensor V1.2

• VCC: Connected to 3V3 of the ESP32.
• GND: Connected to GND of the ESP32.
• AOUT: Connected to G16 of the ESP32.

KF-301 Relay

• power: Connected to 5V of the ESP32.
• ground: Connected to GND of the ESP32.
• signal: Connected to G17 of the ESP32.
• C: Connected to 5V of the 5V Adapter.
• NO: Connected to positive pin of the 5V Mini Water Pump.

5V Mini Water Pump

• positive pin: Connected to NO of the KF-301 Relay.
• negative pin: Connected to GND of the 5V Adapter.

5V Adapter

• 5V: Connected to C of the KF-301 Relay.
• GND: Connected to negative pin of the 5V Mini Water Pump.

Code

There is no code provided for the microcontrollers in this circuit.