Circuit Documentation

Summary

This circuit integrates various sensors and communication modules with an Arduino Nano and an ESP32 Devkit V1. The sensors include a DHT11 Humidity and Temperature Sensor, an Adafruit GUVA-S12SD UV Light Sensor, and a DFRobot Capacitive Soil Moisture Sensor. The communication modules are LoRa Ra-02 SX1278 modules. The circuit is powered by two sets of 2x 18650 batteries.

Component List

1. DHT11 Humidity and Temperature Sensor

   • Pins: VDD, DATA, NULL, GND
   • Description: Measures humidity and temperature.
   • Purpose in Circuit: Provides environmental data.

2. Arduino Nano

   • 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
   • Description: Microcontroller board.
   • Purpose in Circuit: Central control unit for sensors and communication modules.

3. 2x 18650 Battery

   • Pins: vcc, gnd
   • Description: Power source.
   • Purpose in Circuit: Provides power to the circuit.

4. Adafruit GUVA-S12SD UV Light Sensor

   • Pins: 5V, Out, GND
   • Description: Measures UV light intensity.
   • Purpose in Circuit: Provides UV light data.

5. LoRa Ra-02 SX1278

   • Pins: GND, NSS, MOSI, MISO, SCK, D105, DI04, 3.3V, RST, DI00, DI01, D102, DI03
   • Description: Long-range communication module.
   • Purpose in Circuit: Enables long-range wireless communication.

6. ESP32 Devkit V1

   • Pins: 3V3, GND, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, VIN
   • Description: Microcontroller board with Wi-Fi and Bluetooth.
   • Purpose in Circuit: Secondary control unit for communication.

7. DFRobot Capacitive Soil Moisture Sensor (V1.0)

   • Pins: A, VCC, GND
   • Description: Measures soil moisture levels.
   • Purpose in Circuit: Provides soil moisture data.

Wiring Details

DHT11 Humidity and Temperature Sensor

• VDD connected to 3V3 of Arduino Nano
• DATA connected to D2 of Arduino Nano
• GND connected to GND of Arduino Nano

Arduino Nano

• VIN connected to vcc of 2x 18650 Battery
• GND connected to gnd of 2x 18650 Battery
• 5V connected to 5V of Adafruit GUVA-S12SD UV Light Sensor
• D2 connected to DATA of DHT11 Humidity and Temperature Sensor
• D3 connected to DI00 of LoRa Ra-02 SX1278
• A2 connected to Out of Adafruit GUVA-S12SD UV Light Sensor
• A1 connected to A of DFRobot Capacitive Soil Moisture Sensor
• D9 connected to RST of LoRa Ra-02 SX1278
• D10 connected to NSS of LoRa Ra-02 SX1278
• D11/MOSI connected to MOSI of LoRa Ra-02 SX1278
• 3V3 connected to VCC of DFRobot Capacitive Soil Moisture Sensor
• 3V3 connected to 3.3V of LoRa Ra-02 SX1278
• 3V3 connected to VDD of DHT11 Humidity and Temperature Sensor
• D12/MISO connected to MISO of LoRa Ra-02 SX1278
• D13/SCK connected to SCK of LoRa Ra-02 SX1278

2x 18650 Battery

• vcc connected to VIN of Arduino Nano
• gnd connected to GND of Arduino Nano
• vcc connected to VIN of ESP32 Devkit V1
• gnd connected to GND of ESP32 Devkit V1

Adafruit GUVA-S12SD UV Light Sensor

• 5V connected to 5V of Arduino Nano
• Out connected to A2 of Arduino Nano
• GND connected to GND of Arduino Nano

LoRa Ra-02 SX1278 (Arduino Nano)

• GND connected to GND of Arduino Nano
• NSS connected to D10 of Arduino Nano
• MOSI connected to D11/MOSI of Arduino Nano
• MISO connected to D12/MISO of Arduino Nano
• SCK connected to D13/SCK of Arduino Nano
• DI00 connected to D3 of Arduino Nano
• 3.3V connected to 3V3 of Arduino Nano
• RST connected to D9 of Arduino Nano

ESP32 Devkit V1

• VIN connected to vcc of 2x 18650 Battery
• GND connected to gnd of 2x 18650 Battery
• 3V3 connected to 3.3V of LoRa Ra-02 SX1278
• GND connected to GND of LoRa Ra-02 SX1278
• D2 connected to DI00 of LoRa Ra-02 SX1278
• D4 connected to RST of LoRa Ra-02 SX1278
• D5 connected to NSS of LoRa Ra-02 SX1278
• D18 connected to SCK of LoRa Ra-02 SX1278
• D19 connected to MISO of LoRa Ra-02 SX1278
• D23 connected to MOSI of LoRa Ra-02 SX1278

DFRobot Capacitive Soil Moisture Sensor (V1.0)

• A connected to A1 of Arduino Nano
• VCC connected to 3V3 of Arduino Nano
• GND connected to GND of Arduino Nano

LoRa Ra-02 SX1278 (ESP32 Devkit V1)

• GND connected to GND of ESP32 Devkit V1
• NSS connected to D5 of ESP32 Devkit V1
• MOSI connected to D23 of ESP32 Devkit V1
• MISO connected to D19 of ESP32 Devkit V1
• SCK connected to D18 of ESP32 Devkit V1
• DI00 connected to D2 of ESP32 Devkit V1
• 3.3V connected to 3V3 of ESP32 Devkit V1
• RST connected to D4 of ESP32 Devkit V1

Documented Code

Arduino Nano Code

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

}

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

}

Additional Documentation

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