Perun LoRa (Arduino)

Repository consists of two projects:

• PERUN_ROCKET
• PERUN_BASE

Pinout

LoRa pins can be changed in LoRa_Base.ino file (for PERUN_BASE) and LoRa_Rocket.ino (for PERUN_ROCKET). LoRa SPI pins (SCK, MOSI, MISO) should be connected to corresponding SPI pins on the Arduino board (usually respectively 18,23,19 for ESP32 boards). LORA_SS_PIN - Slave Select pin. LORA_RESET_PIN - LoRa reset pin.

startLoRa function initializes LoRa radio with specified hardcoded frequency on specified hardcoded pins

Data packet

Before any data there should be LORA_PACKET_MAGIC string to make sure we are not processing garbage.

Types of data:

• LORA_PACKET_TELEMETRY_TYPE (0x01) Telemetry from the rocket
• LORA_PACKET_STATUS_TYPE (0x02) Status of the rocket
• LORA_PACKET_COMMAND_TYPE (0xA1) Command from the base

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PERUN ROCKET

Sends telemetry to the base and listens to commands.

Functions:

• sendTelemetry - (based on logTelemetry from SDlog.ino) sends telemetry
• sendStatus - sends current rocket status (temporary: int STAT from PERUN_ROCKET.ino)
• parseLoRaData - parses packet and executes commands (eg. ignition function or parachute deployment function)

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PERUN BASE

Sends commands from Serial and receives telemetry from the rocket.

LoRa_Base functions:

• sendCommand - sends (binary) command to the rocket (LORA_START_CMD_CODE(0x41) for ignition, LORA_DEPLOY_CMD_CODE(0x42) for parachute deployment)
• parseLoRaData - parses PR packet and prints received telemetry or rocket status

Perun_SerialCmd functions:

• executeCommand - executes specified function based on data received from Serial
• checkForCommand - checks if there are any commands on Serial

Available commands:

• PR (should print "OK\n")
• PR+START (starts rocket)
• PR+DEPLOY (deploys parachute)
• PR+LORA (dumps LoRa registers)

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All functions save data to Stream specified as an argument (eg. Serial or SD).

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Live demo of actual working modules (left: Base; right: Rocket).

Libraries

Code uses Arduino LoRa library, which is licensed under the MIT Licence.