I'm just now starting on a project where i want a device that looks like a simple watch, but has bluetooth, vibration, and a single button. I want it to connect to my phone and vibrate my messages in morse code. (I already know how to set this up, my phone does it on its own). But i also want to have a single button on it that i could transmit morse code to my phone to reply. I just wanted some ideas of hardware would be needed to do this. I am rather new to this sort of thing. Thank You.
If the smart watch will be using an ATmega processor, prototype the entire thing with an Arduino. Plenty of Morse code and Bluetooth software around.
Google "arduino wristwatch" for other ideas.
Consider the ESP32 which is a very small chip that is programmable with the Arduino IDE and has Bluetooth, WiFi etc. Costs about $10
What is ESP32?
ESP32 is a series of low cost, low power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. The ESP32 series employs a Tensilica Xtensa LX6 microprocessor in both dual-core and single-core variations and includes in-built antenna switches, RF balun, power amplifier, low-noise receive amplifier, filters, and power management modules. ESP32 is created and developed by Espressif Systems, a Shanghai-based Chinese company, and is manufactured by TSMC using their 40 nm process. It is a successor to the ESP8266 microcontroller.
See info HERE
I love Morse for it’s simplicity. If sounded, it goes around corners. It works in the dark, with your eyes closed. If coupled with Text-To-Speech output you can run a home automation system with 1 button in the dark.