Difference between revisions of "EspNowAudio"

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(Result)
Line 33: Line 33:
 
== Result ==
 
== Result ==
 
ESP NOW broadcast just seems to work fine (not sure what prevented me from making it work earlier).
 
ESP NOW broadcast just seems to work fine (not sure what prevented me from making it work earlier).
I've set the WiFi channel to 1.
+
I've fixed the WiFi channel to 1.
  
 
On the receiving side, I use an ESP32.
 
On the receiving side, I use an ESP32.
Line 41: Line 41:
 
* send a message
 
* send a message
 
* that's it!
 
* that's it!
 +
 +
Transmission appears to be very fast, taking less than a millisecond for 10 messages in a row.
 +
However, with broadcast, the sending side does not receive (or wait for) any acknowledgements, the tx callback just reports the broadcast address, the rx callback reports nothing.
  
 
== References ==
 
== References ==
 
* https://www.espressif.com/sites/default/files/documentation/esp-now_user_guide_en.pdf
 
* https://www.espressif.com/sites/default/files/documentation/esp-now_user_guide_en.pdf

Revision as of 13:09, 16 March 2020

Project EspNowAudio
350px
Status Initializing
Contact bertrik
Last Update 2020-03-16

What

The idea is to experiment a bit more with ESP now, in particular in combination with audio transfer.

Stuff to learn:

Possible end result: A kind of zero-standby power intercom. When you press the button, an ESP8266 is powered up. It immediately starts transmitting audio from a digital I2S microphone over ESP now. The receiving end will probably be an ESP32, that receives the ESP now audio and converts into a standardized audio-over-ip protocol, e.g. VBAN.

Plans:

  • build an Arduino playground project so I can access the API from the command line and play with it
  • start with an ESP32 + INMP441

Related interesting stuff:

Result

ESP NOW broadcast just seems to work fine (not sure what prevented me from making it work earlier). I've fixed the WiFi channel to 1.

On the receiving side, I use an ESP32. On the sending side, I use an ESP8266:

  • init the esp now library
  • add the broadcast address as a peer
  • send a message
  • that's it!

Transmission appears to be very fast, taking less than a millisecond for 10 messages in a row. However, with broadcast, the sending side does not receive (or wait for) any acknowledgements, the tx callback just reports the broadcast address, the rx callback reports nothing.

References