Morse CW Beacon

Here you can find the sources of a simple CW beacon, for ESP32 board with LoRa and OLED display. The beacon sends a predefined message as Morse code on a fixed frequency, like 433.575 MHz. The signal can be received using any FM walkie Talkie (VHF / UHF )

Hardware Requirements

• ESP32 board with LoRa SX12xx transceiver and OLED SSD1306 display

Boards are supported:

• WIFI-LORA32 (original)
• TTGO-LORA32 (original)
• Lilygo ESP32 433 / 866 LoRa T3_V1.6.1 (ESP PICO-D4 in Arduino iDE) (Now, tested 144, 430, 433, 466)
• Lilygo ESP32 866 LoRa T3_V1.6.1 (ESP PICO-D4 in Arduino iDE) (Now, tested 866)
• Lilygo T-Beam 433 LoRa GPS (Now, tested 144, 430, 433, 466))

Software Requirements

• Arduino IDE >= 1.8.5
• Arduino support for ESP32 platform
• Adafruit GFX Library

Build

1. Get the sources: git clone https://github.com/sergev/morse-beacon.git

2. Select message, random characters or random 5 groups with comment or uncomment the message at end of morse-beacon.ino file.

3. Make sure pin definitions match your ESP32 board (LORA_RST, OLED_SDA, OLED_SCL, LED).

4. Change the frequency to the desired value (FREQ_HZ).

5. Compile and upload the program to the board.

Credits

morse-beacon was created by Serge Vakulenko, KK6ABQ and modified by Juan Pablo Sanchez EA5JSB in 18/1/2025