Circuit Documentation

Summary

This circuit is designed to control a water pump based on soil moisture levels. It uses an Arduino Nano to read data from a soil moisture sensor and activate a relay module to power the water pump. The circuit is powered by a 18650 Li-Ion battery and includes a rocker switch for manual control.

Component List

1. Arduino Nano

   • Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

2. 1 Channel 5V Relay Module

   • Description: A relay module that allows the Arduino to control high voltage devices.
   • Pins: VCC+, VCC- (GND), IN, N.O., COM, N.C.

3. SparkFun Soil Moisture Sensor

   • Description: A sensor used to measure the moisture level in the soil.
   • Pins: VCC, GND, SIG

4. 18650 Li-Ion

   • Description: A rechargeable lithium-ion battery.
   • Pins: Positive, Negative

5. Rocker Switch

   • Description: A switch used to manually control the power to the circuit.
   • Pins: 1, 2

6. Water Pump

   • Description: A small water pump used to irrigate plants.
   • Pins: VCC, GND

Wiring Details

Arduino Nano

• GND: Connected to the GND of the Water Pump, GND of the Relay Module, and GND of the Soil Moisture Sensor.
• D2: Connected to the SIG pin of the Soil Moisture Sensor.
• D3: Connected to the IN pin of the Relay Module.
• VIN: Connected to the COM pin of the Relay Module and pin 2 of the Rocker Switch.
• 5V: Connected to the VCC+ pin of the Relay Module and VCC pin of the Soil Moisture Sensor.

1 Channel 5V Relay Module

• VCC+: Connected to the 5V pin of the Arduino Nano.
• VCC- (GND): Connected to the GND of the Arduino Nano and GND of the Water Pump.
• IN: Connected to the D3 pin of the Arduino Nano.
• N.O.: Connected to the VCC pin of the Water Pump.
• COM: Connected to the VIN pin of the Arduino Nano and pin 2 of the Rocker Switch.

SparkFun Soil Moisture Sensor

• VCC: Connected to the VCC+ pin of the Relay Module and 5V pin of the Arduino Nano.
• GND: Connected to the GND of the Arduino Nano and Negative pin of the 18650 Li-Ion.
• SIG: Connected to the D2 pin of the Arduino Nano.

18650 Li-Ion

• Positive: Connected to pin 1 of the Rocker Switch.
• Negative: Connected to the GND of the Soil Moisture Sensor and GND of the Arduino Nano.

Rocker Switch

• 1: Connected to the Positive pin of the 18650 Li-Ion.
• 2: Connected to the COM pin of the Relay Module and VIN pin of the Arduino Nano.

Water Pump

• VCC: Connected to the N.O. pin of the Relay Module.
• GND: Connected to the GND of the Relay Module and GND of the Arduino Nano.

Documented Code

sketch.ino

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

}

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

}

documentation.txt

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the code used in the Arduino Nano.