Circuit Documentation

Summary

This circuit is designed to interface with various sensors and a display module, controlled by an Arduino UNO microcontroller. The sensors include a soil moisture sensor, a soil temperature sensor, an NPK soil sensor, and a DHT11 temperature and humidity sensor. The circuit also includes an RS485 transceiver for serial communication and a water pump for actuation. A 9V battery provides power to the system. The display module is a 0.96" OLED screen for visual output. The Arduino UNO manages sensor readings, controls the water pump, and communicates data through the RS485 transceiver.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Used as the main controller for the circuit

RS485 Transceiver

• Serial communication module for long-distance and differential communication

SparkFun Soil Moisture Sensor

• Measures the volumetric content of water in soil

Soil Temperature Sensor

• Measures the temperature of the soil

NPK Soil Sensor (mini)

• Measures the nitrogen, phosphorus, and potassium content in the soil

DHT11 Sensor V2

• Measures ambient temperature and humidity

9V Battery

• Provides power to the circuit

0.96" OLED

• Small display module for visual output of sensor data

Water Pump

• Actuator for controlling water flow based on sensor readings

Wiring Details

Arduino UNO

• A4 (SCL) connected to Soil Temperature Sensor (SCK) and OLED (SCK)
• A5 (SDA) connected to Soil Temperature Sensor (SDA) and OLED (SDA)
• GND connected to OLED (GND), Soil Moisture Sensor (GND), DHT11 Sensor (GND), Water Pump (GND), and Soil Temperature Sensor (GND)
• 3.3V connected to OLED (VDD), Soil Moisture Sensor (VCC), and DHT11 Sensor (VCC)
• 5V connected to Soil Temperature Sensor (VCC) and RS485 (VCC)
• D13 connected to Water Pump (VCC)
• D12 connected to RS485 (DI)
• D11 connected to RS485 (DE)
• D10 connected to RS485 (RE)
• D9 connected to RS485 (RO)
• D3 connected to Soil Moisture Sensor (SIG)
• D2 connected to DHT11 Sensor (DAT)

RS485 Transceiver

• VCC connected to Arduino UNO (5V)
• GND connected to NPK Soil Sensor (GND)
• B connected to NPK Soil Sensor (B)
• A connected to NPK Soil Sensor (A)
• DE connected to Arduino UNO (D11)
• DI connected to Arduino UNO (D12)
• RE connected to Arduino UNO (D10)
• RO connected to Arduino UNO (D9)

SparkFun Soil Moisture Sensor

• VCC connected to Arduino UNO (3.3V)
• GND connected to Arduino UNO (GND)
• SIG connected to Arduino UNO (D3)

Soil Temperature Sensor

• VCC connected to Arduino UNO (5V)
• SDA connected to Arduino UNO (A5)
• GND connected to 9V Battery (-)
• SCK connected to Arduino UNO (A4)

NPK Soil Sensor (mini)

• VCC connected to 9V Battery (+)
• GND connected to RS485 (GND)
• A connected to RS485 (A)
• B connected to RS485 (B)

DHT11 Sensor V2

• VCC connected to Arduino UNO (3.3V)
• DAT connected to Arduino UNO (D2)
• GND connected to Arduino UNO (GND)

9V Battery

• (+) connected to NPK Soil Sensor (VCC)
• (-) connected to Soil Temperature Sensor (GND)

0.96" OLED

• VDD connected to Arduino UNO (3.3V)
• SCK connected to Arduino UNO (A4)
• SDA connected to Arduino UNO (A5)
• GND connected to Arduino UNO (GND)

Water Pump

• VCC connected to Arduino UNO (D13)
• GND connected to Arduino UNO (GND)

Documented Code

Arduino UNO Code (sketch.ino)

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

}

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

}

Note: The provided code is a template and does not include specific functionality. It needs to be completed with setup configurations and loop operations to handle sensor readings, data processing, and actuator control.