BLE-SDK-dat

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Which BLE Example to Use for Sending ADC Voltage to Phone

Your goal:

• ESP32 reads ADC (battery voltage).
  
• Phone should receive/read the value over BLE.
  

Best Choices

• Notify ✅

  • ESP32 acts as a BLE server.
    
  • Sends automatic notifications with the ADC voltage.
    
  • Best if you want real-time updates on your phone.
    

• Server ✅

  • ESP32 acts as a BLE server.
    
  • Phone connects and reads the ADC value on demand.
    
  • Good if you don’t need constant updates.
    

• UART ✅

  • Implements a BLE serial-like service.
    
  • You can "print" ADC values and read them with a BLE UART app.
    
  • Easiest for testing/debugging, but less standard.
    

Not Suitable

• Beacon / iBeacon / EddystoneTLM_Beacon / EddystoneURL_Beacon ❌

  • These only broadcast fixed or simple data.
    
  • Not designed for continuous ADC updates.
    

• Scan / Beacon_Scanner / Client / Client_secure_static_passkey ❌

  • These examples make ESP32 a client/scanner, not a server.
    
  • Your phone should be the client, so not useful here.
    

• BLE5_extended_scan / BLE5_multi_advertising / BLE5_periodic_advertising / BLE5_periodic_sync ❌

  • Advanced BLE5 features (scanning, multi-adv, periodic sync).
    
  • Not needed for simple ADC-to-phone communication.
    

• Server_multiconnect / Server_secure_authorization / Server_secure_static_passkey ❌

  • Variants of the Server example with multi-client or security features.
    
  • Only needed if you want multiple phones connected or secure pairing.
    

ref

• bluetooth-dat