esp-idf-uart2bt

UART to Bluetooth bridge for ESP-IDF.

Software requirements

ESP-IDF V4.4/V5.x. ESP-IDF V5.0 is required when using ESP32-C2. ESP-IDF V5.1 is required when using ESP32-C6.

Using classic bluetooth (ESP32 only)

git clone https://github.com/nopnop2002/esp-idf-uart2bt
cd esp-idf-uart2bt/classic_bt
idf.py set-target esp32
idf.py menuconfig
idf.py flash

Using ble 4.2

git clone https://github.com/nopnop2002/esp-idf-uart2bt
cd esp-idf-uart2bt/ble
idf.py set-target {esp32/esp32s3/esp32c2/esp32c3/esp32c6}
idf.py menuconfig
idf.py flash

Configuration

Write this sketch on Arduino Uno.

You can use any AtMega microcontroller.

unsigned long lastMillis = 0;

void setup() {
  Serial.begin(115200);
}

void loop() {
  while (Serial.available()) {
    String command = Serial.readStringUntil('\n');
    Serial.println(command);
  }

  if(lastMillis + 1000 <= millis()){
    Serial.print("Hello World ");
    Serial.println(millis());
    lastMillis += 1000;
  }

  delay(1);
}

Connect ESP32 and AtMega328 using wire cable

You can change it to any pin using menuconfig.

Android Application

I used this app.

iOS Application

This might work, but I don't have iOS so I don't know.