EspNowAudio: Difference between revisions
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* ESP now broadcast mode: does it really work? | * ESP now broadcast mode: does it really work? YES, it does work, there's no ACK (so it's even a bit faster). | ||
* ESP now throughput: https://hackaday.io/project/166868-my-attempt-at-an-esp-now-mesh/log/166398-072419-maximum-transmission-throughput-of-esp-now | * ESP now throughput: https://hackaday.io/project/166868-my-attempt-at-an-esp-now-mesh/log/166398-072419-maximum-transmission-throughput-of-esp-now | ||
* ESP now packet loss when used continuously | * ESP now packet loss when used continuously | ||
Revision as of 12:11, 16 March 2020
| Project EspNowAudio | |
|---|---|
| |
| 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:
- ESP now broadcast mode: does it really work? YES, it does work, there's no ACK (so it's even a bit faster).
- ESP now throughput: https://hackaday.io/project/166868-my-attempt-at-an-esp-now-mesh/log/166398-072419-maximum-transmission-throughput-of-esp-now
- ESP now packet loss when used continuously
- Audio over IP protocols, e.g. VBAN
- Possibility to transfer even ultrasonic audio?
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:
- https://www.hackster.io/julianfschroeter/esp32-voice-streamer-52bd7e
- ESP audio playback https://github.com/earlephilhower/ESP8266Audio
- VBAN specification https://www.vb-audio.com/Voicemeeter/VBANProtocol_Specifications.pdf
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.