Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP32 microcontroller, a LoRa Ra-02 SX1278 module, an ADXL345 accelerometer, a DFRobot Capacitive Soil Moisture Sensor, and a 18650 Li-Ion battery. The circuit is designed to interface these components for various sensing and communication tasks.

Component List

18650 Li-Ion

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

ESP32

• Description: A powerful microcontroller with integrated Wi-Fi and Bluetooth.
• 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

LoRa Ra-02 SX1278

• Description: Long-range transceiver module.
• Pins: GND, NSS, MOSI, MISO, SCK, D105, DI04, 3.3V, RST, DI00, DI01, D102, DI03

ADXL345

• Description: 3-axis digital accelerometer.
• Pins: GND, VCC, CS, INT1, INT2, SDO, SDA, SCL

DFRobot Capacitive Soil Moisture Sensor (V1.0)

• Description: Capacitive soil moisture sensor.
• Pins: A, VCC, GND

Wiring Details

18650 Li-Ion

• Positive is connected to VIN of the ESP32.
• Negative is connected to:
  • GND of the ESP32
  • GND of the ADXL345
  • GND of the LoRa Ra-02 SX1278
  • GND of the DFRobot Capacitive Soil Moisture Sensor

ESP32

• D34 is connected to A of the DFRobot Capacitive Soil Moisture Sensor.
• VIN is connected to Positive of the 18650 Li-Ion.
• GND is connected to:
  • Negative of the 18650 Li-Ion
  • GND of the ADXL345
  • GND of the LoRa Ra-02 SX1278
  • GND of the DFRobot Capacitive Soil Moisture Sensor
• 3V3 is connected to:
  • VCC of the ADXL345
  • 3.3V of the LoRa Ra-02 SX1278
  • VCC of the DFRobot Capacitive Soil Moisture Sensor
• D2 is connected to DI00 of the LoRa Ra-02 SX1278.
• D5 is connected to NSS of the LoRa Ra-02 SX1278.
• D18 is connected to SCK of the LoRa Ra-02 SX1278.
• D19 is connected to MISO of the LoRa Ra-02 SX1278.
• D21 is connected to SDA of the ADXL345.
• D22 is connected to SCL of the ADXL345.
• D23 is connected to MOSI of the LoRa Ra-02 SX1278.

LoRa Ra-02 SX1278

• GND is connected to:
  • Negative of the 18650 Li-Ion
  • GND of the ESP32
  • GND of the ADXL345
  • GND of the DFRobot Capacitive Soil Moisture Sensor
• 3.3V is connected to 3V3 of the ESP32.
• DI00 is connected to D2 of the ESP32.
• NSS is connected to D5 of the ESP32.
• SCK is connected to D18 of the ESP32.
• MISO is connected to D19 of the ESP32.
• MOSI is connected to D23 of the ESP32.

ADXL345

• GND is connected to:
  • Negative of the 18650 Li-Ion
  • GND of the ESP32
  • GND of the LoRa Ra-02 SX1278
  • GND of the DFRobot Capacitive Soil Moisture Sensor
• VCC is connected to 3V3 of the ESP32.
• SDA is connected to D21 of the ESP32.
• SCL is connected to D22 of the ESP32.

DFRobot Capacitive Soil Moisture Sensor (V1.0)

• A is connected to D34 of the ESP32.
• VCC is connected to 3V3 of the ESP32.
• GND is connected to:
  • Negative of the 18650 Li-Ion
  • GND of the ESP32
  • GND of the ADXL345
  • GND of the LoRa Ra-02 SX1278

Code

No code is provided for this circuit.