Can we have the ggwave library to support Arduino?

[junwoo]

we used to use Chrip Arduino as data over sound solution, can we have ggwave library as alternative solution as Chrip was sold and changed to closed project.

I have tried ggwave, it works perfect between different platforms, it will be great to have the library support on microchip.

Thank you.

[ggerganov]

Sure - let's do it!

Can you tell me what hardware you use for your project? And operating system?

[ggerganov]

Do the Arduino boards have built-in mics or speakers?
I'm not very familiar yet - will try to get one and experiment with it.

[junwoo]

Bad me, I almost forget the microphone.
Yes, it supports microphone module, pls check the link https://diyi0t.com/sound-sensor-arduino-esp8266-esp32/

[tigercoxgithub]

Do the Arduino boards have built-in mics or speakers?

I'm not very familiar yet - will try to get one and experiment with it.

Hello, did you get any further with your arduino implementation. I am very interested in this :)

[ggerganov]

Hi, I now have the hardware - Arduino UNO + speaker. I haven't started porting the lib yet.
I think the transmission part would be possible to implement, but I'm not sure about the receiving part.

In order to implement receiving + decoding I need to develop real-time audio capture through a mic and efficient FFT implementation. If anyone can provide references to similar Arduino projects for real-time audio capture and processing, it would help a lot.

[ggerganov]

Here are some preliminary experiments with a hard-coded message -- looking good so far:

arduino-0.mp4

[ggerganov]

The Tx port is ready:

arduino-tx-3.mp4

Let's see if we can make the Arduino also receive some data!

[junwoo]

that is a great job.

I found some projects which related with Arduino + Mic, I don't if we can borrow some concept from them
https://www.circuitbasics.com/how-to-use-microphones-on-the-arduino/
https://www.hackster.io/mvtdesign/wifi-microphone-with-arduino-and-esp8266-updated-69934d

[dcmckay13]

So this is one that I've been looking into. It uses an Adafruit Huzzah 32 a Adafruit ADC:MCP3008
and a MEM microphone. I'm not exactly sure why I couldn't get mine working bit I suspect that if I fried my MCP300, I am not really sure why the 10bit chip is required as the Feather has multiple 12-bit ADCs. https://github.com/weckbach/AstroMech

[dcmckay13]

The end goal for me (before I hit a wall with the programming) was to use this other esp32 from Lily/TTGO with the built in screen to display the incoming transmission https://www.amazon.com/LILYGO-T-Display-Arduino-Development-CH9102F/dp/B099MPFJ9M/ref=sr_1_1?m=A3P8OJPGEGCZAI&qid=1652567881&s=merchant-items&sr=1-1

[dcmckay13]

There is another that uses an Arduino and some other compennets including a hypersonic microphone. This version seems really finicy because requires a lot more components and has to be "tuned-in" via a potentiometer. From what I've read the ADC (in both devices) needs to have a sampling rate at least twice as fast as the highest detectable frequency. https://hackaday.com/2018/06/01/dead-simple-ultrasonic-data-communication.

[dcmckay13]

If you need to add error correction I guess Reed-Solomon error correction is the standard that many Data-Over-Sound projects use

[ggerganov]

Thanks for the links - will take a look at some point in more details.
Btw, ggwave already uses Reed-Solomon ECC.

[ggerganov]

Good news everyone! I was able to port the Rx part of ggwave for Arduino.
I now have the Arduino Nano RP2040 Connect receiving short audio messages 🎉

The cool thing is that this board has a built-in microphone so you don't need any extra hardware except the actual Arduino.

The maximum supported sample rate seems to be 20000 Hz, so you won't be able to use the existing ggwave protocols. Instead, I plan to introduce Arduino-specific protocols which will be available in the non-Arduino library as well.

I'm still trying to figure out the optimal parameters for the transmission, but so far I am satisfied with the robustness. It's not as good as the phone or PC mics, but it should be enough for most applications. As long as the transmitter is within 40-50 cm it works great.

The main issue currently is that ggwave currently uses too much memory. Need to reduce the dynamic memory allocations as much as possible.

The code is currently available on the arduino branch #65, but it is a total mess. I was in a hurry to make the PoC. Next couple of weeks I won't have much time to work on this, so expect official release some time after that.

So glad I got this working. This is going to be awesome!

[ggerganov]

The Arduino port of ggwave is 99% complete. So far, I got it working with the following microcontrollers:

• Arduino UNO (Tx only)
• Arduino RP2040 (Tx + Rx, overall very good results)
• ESP32 (Rx, Tx not tested yet), using MAX9814 microphone (got a few other mics to test)
• ESP8266 (have the chip, not tested yet)

Checkout #65 for instructions of how to use it. The PR is almost a complete rewrite of ggwave and includes a lot of improvements. I will be merging this soon to the master branch, but first I want to improve the Arduino / ESP examples and probably get some feedback from other people too.

If you want to give it a try, do the following steps:

• checkout the latest arduino branch
• run cmake and make
• in a terminal on your computer, start the ggwave-cli tool like this: ./bin/ggwave-cli -t11 -l16 -s
• using Arduino IDE, open one of the arduino-rx or esp32-rx examples (depending on what chip you want to use) and upload the sketch to your chip
• for each example, there is a photo of a sample board configuration included in the PR
• observe the Serial output of your microcontroller and see if it is able to receive messages from your computer's speakers using the ggwave-cli tool

I've been doing a lot of tests and using the new MT protocols I am able to transfer reliably short message to/from the microcontrollers.
If some of you give this a try, please let me know how it went.

[ggerganov]

The port is now completely ready! Here is a short demonstration of Arudino, ESP32 and Android phone communicating via sound:

IMG_0554_small.mp4

Watch higher quality on YouTube

The PR code is now merged in the master branch. If you want to try it, checkout the respective examples in the examples folder. Any feedback will be much appreciated!

[ggerganov]

ggwave is now available as Arduino library:

https://github.com/ggerganov/ggwave-arduino