This is a small project created by ULSIT's robotics club Unibotics. Its purpose is to learn how to connect to an ESP32 through bluetooth and send/receive commands. This particular code is able to receive commands that play animations with LEDs.
- One breadboard.
- One red F5 LED.
- One 41 Ohm resistor.
- One 22 Ohm resistor.
- Two male to female cables.
- One Type-C ESP32-C6 WIFI Bluetooth Development Core Board.
| Component | Connection Description | ESP32-C6/ Breadboard |
|---|---|---|
| Red LED (Anode) | Positive leg (longer) of LED | Connect to Pin-2 (ESP32-C6) |
| Red LED (Cathode) | Negative leg (shorter) of LED | Connect to Serial Resistor Connection |
| SRC(41Ω + 22Ω) | Limits the current to the LED | One end to the Cathode of the LED |
| SRC(41Ω + 22Ω) | Connect the other end of the resistor to GND | Connect to GND on ESP32-C6 |
| ESP32-C6 GND | Ground of the ESP32-C6 board | Connect to Resistor |
- An arduino IDE for code writing/compilation
- ESP32C6 Dev Module [arduino board]
- BLE [library for bluetooth conneciton]
- Android Apps for connection
- Serial Bluetooth terminal - https://play.google.com/store/apps/details?id=de.kai_morich.serial_bluetooth_terminal [used for connecting to the ESP and sending commands]
- nRF Connect - https://play.google.com/store/apps/details?id=no.nordicsemi.android.mcp [used for creating a Bluetooth LE profile that the app above can use]
Once connected to the ESP32-C6, you can begin sending commands. Every command is made out of a fixed width string in the form "<command> <value>", where <command> is a string of 3 characters indicating a command and <value> is a string with a numeric value (such as 001, 034, 211). The numeric value must be padded to contain 3 digits. The whole command should be exactly 7 characters long.
Mobile> ra1 005
[The ESP now runs the blinking animation 5 times]
ESP> Command Executed
The source code contains the available commands (only ra1 for now) and the different error codes that might be returned to the bluetooth device if the command is not formatted properly.