Circuit Documentation

Summary

This circuit integrates a Xiao ESP32 C3 microcontroller with an Adafruit RFM9x LoRa Radio module. The design facilitates communication over LoRa, a long-range, low-power wireless platform, by connecting the necessary control and data lines between the microcontroller and the LoRa module. The circuit is powered through the microcontroller's VUSB pin, which is connected to the VIN pin of the LoRa module to share the power supply. Ground connections are also shared between the two devices to complete the power circuit. The SPI interface, consisting of SCK, MISO, and MOSI pins, is used for data transfer between the microcontroller and the LoRa module. Additional control lines are connected for chip select (CS), reset (RST), and interrupt-driven event handling (DIO0).

Component List

Xiao ESP32 C3

• Description: A compact and powerful microcontroller featuring the ESP32 C3 chip, suitable for a variety of IoT applications.
• Pins: D7, D8, D9, D10, 3.3v, GND, VUSB, D6, D5, D4, D3, D2, D1, D0

Adafruit RFM9x LoRa Radio

• Description: A LoRa-enabled radio module that allows for long-range communication over the LoRa network.
• Pins: DIO1, DIO2, DIO3, DIO4, DIO5, ANTENNA, VIN, GND, EN, DIO0, SCK, MISO, MOSI, CS, RST

Comments

• Description: Placeholder components for additional notes or documentation within the circuit design. These components do not have physical representations or connections in the circuit.

Wiring Details

Xiao ESP32 C3 Wiring

• VUSB to Adafruit RFM9x LoRa Radio VIN
• GND to Adafruit RFM9x LoRa Radio GND
• D1 to Adafruit RFM9x LoRa Radio DIO0
• D8 to Adafruit RFM9x LoRa Radio SCK
• D9 to Adafruit RFM9x LoRa Radio MISO
• D10 to Adafruit RFM9x LoRa Radio MOSI
• D2 to Adafruit RFM9x LoRa Radio CS
• D0 to Adafruit RFM9x LoRa Radio RST

Adafruit RFM9x LoRa Radio Wiring

• VIN connected to Xiao ESP32 C3 VUSB
• GND connected to Xiao ESP32 C3 GND
• DIO0 connected to Xiao ESP32 C3 D1
• SCK connected to Xiao ESP32 C3 D8
• MISO connected to Xiao ESP32 C3 D9
• MOSI connected to Xiao ESP32 C3 D10
• CS connected to Xiao ESP32 C3 D2
• RST connected to Xiao ESP32 C3 D0

Documented Code

No code has been provided for the microcontroller. The documentation of the code would typically include a description of the functionality, setup and loop functions, and any additional functions or libraries used to control the hardware components. Since no code is available, this section remains empty. When code is provided, it should be documented here with appropriate comments and explanations for each part of the code.