ESP32 Morse

Lightweight ESP32 project that runs a small web portal in Access Point mode and sends Morse code by beeping a buzzer and blinking an LED. A 16x2 I2C LCD shows status and scrolls the message while playing.

Features

• Serves a single-page web UI (AP mode) to enter a message and unit speed
• Plays Morse code through a buzzer and a status LED
• Scrolls playing message on a 16x2 I2C LCD
• Adjustable speed (unit in milliseconds) from 50 to 1000 ms per unit

Files

• sketch.ino — Main Arduino/ESP32 sketch implementing the web server, Morse playback, and LCD UI

Hardware

• ESP32 development board
• Piezo buzzer connected to GPIO 5 (BUZZER_PIN)
• External LED connected to GPIO 4 (LED_PIN)
• On-board LED used on GPIO 2 (ONBOARD_LED)
• 16x2 I2C LCD (default address 0x27) using SDA=GPIO21 and SCL=GPIO22

Wiring summary:

• Buzzer -> GPIO5
• External LED -> GPIO4 (with appropriate resistor)
• LCD SDA -> GPIO21, SCL -> GPIO22 (GND and 5V/3.3V as appropriate)

Software / Libraries

• ESP32 board support for Arduino (select an ESP32 board in the Arduino IDE or PlatformIO)
• Libraries used in the sketch:
  • LiquidCrystal_I2C (I2C LCD support)
  • Ticker (for blinking the onboard LED)
  • WebServer (provided by ESP32 core)

Install these via the Arduino Library Manager or add to your platformio.ini.

How it works

• The ESP32 starts in Wi-Fi AP mode with SSID ESP32-Morse and password alphazero.
• Open a browser and go to the device IP (default AP IP is 192.168.4.1) or simply visit http://192.168.4.1/.
• The web UI accepts a text message and a unit value (ms per Morse unit). The default unit is 100 ms.
• Submitting sends a GET request to /send?text=...&unit=.... The device replies OK then plays the Morse code and updates the LCD while playing.

Morse timing (implemented in sketch.ino):

• Dot = 1 unit ON
• Dash = 3 units ON
• Intra-character gap = 1 unit OFF
• Between letters = 3 units total (the code implements small additional gaps)
• Between words = 7 units total

Usage

1. Flash sketch.ino to your ESP32 using the Arduino IDE or PlatformIO.
2. Power the board; it will create the Wi-Fi AP ESP32-Morse (password alphazero).
3. Connect your computer or phone to that AP.
4. Open http://192.168.4.1/ in a browser, enter a message and optional unit speed, then press Send.

HTTP API

• GET / — serves the web UI
• GET /send?text=<message>&unit=<ms> — trigger Morse playback; unit optional (50–1000)

Troubleshooting

• If the LCD shows nothing, confirm the I2C address (0x27) and wiring.
• If buzzer/LED don't respond, check pins and wiring and ensure the sketch matches your pin assignments.
• If you can't reach the web UI, verify your device connected to the ESP32 AP and try http://192.168.4.1/.
• Use the Serial Monitor at 115200 baud for debug prints (the sketch prints the AP IP and server start message).

Notes & customization

• Change unitMs default in sketch.ino to alter default speed.
• Modify pin constants (BUZZER_PIN, LED_PIN, ONBOARD_LED) to suit your wiring.
• The LCD address and I2C pins are set at the top of sketch.ino — update if your hardware differs.

License This project is provided as-is. Adapt and reuse as you like.