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AudioMoth not recognised on iPad Pro with USB C connector

When trying to view the output from an AudioMoth USBmicrophone with the OxfordWaveResearch Spectrum View App on an iPad Pro tablet the AudiuoMoth is not recognised by the tablet when connected via the USB C socket with an Apple "USB C to USB" adapter. The iPad/SpectrumView App does recognise a Dodotronic Ultramic 250K connected via the same adapter.

However, the AudioMoth (and Dodotronic Ultramic 250K) is recognised by an iPhone X running the SpectrumView App with an Apple "USB to Lightning" adapter ?

Is this a known problem ?

Martin Love

9 comments

9 Comments

martin

Jun 08

Hi, indeed I am mystified !!!!!

and again yes, I have been perturbed a few times with forgetting to switch to 'CUSTOM' etc !

I will let you know if an alternative extension cable works ????????

Thanks for your, as always, very prompt help and advice !

Alex Rogers

Jun 09

Replying to

Very strange. I double-checked on my 4 Apple USB-A to USB-C adaptors and they all worked fine. They are marked 'Model A1632'. Unlike some dongles I think they just have some static protection diodes and no other electronics so seems unlikely that they would fail.

Edited

martin

Jun 09

Replying to

Indeed, mine is marked "Model 1632" as well ! Perhaps it is just a mechanical aberration so that the connections don't align or something with this particular pairing ????? If there is going to be a rouge item I WILL GET IT !!! However we do have a functioning alternative so thank you again for your help.

martin

Jun 09

Replying to

ADDITIONAL INFORMATION !

It seems the"AudioMoth USB mic" IS recognised if a SHORT i.e. 1 Metre, micro-USB to USB-C cable with Apple USB-A to USB-c adapter is used !!!!!! But NOT with some longer cables, I have tried 5 metre or 9 metre cables !

martin

Jun 08

Hi Alex

The AudioMoth USBMic was running the 1.2.4 firmware but is now running the latest 1.3.0 firmware with the same results.

HOWEVER !!!!! It seems that the extension cable used for the AudioMoth USB mic (AMUSBM) may be the problem on the iPad with adapter connector !

This extension cable works perfectly fine connecting the AMUSBM to the Laptop and running the AudiioMoth Live App etc

!!!! But not it seems when connected to the iPad USB C input with the APPLE adapter !

See below, APPLE USB C to USB adapter (which works fine with the Dodotronic mic, although a different extension cable !) ???

The extension cable wasn't a 'cheap' cable so had thought it should be a 'data cable' as advertised and it seems most of the time IS. I will try an alternative to see if that makes any difference !

For info'. Ultrasonic App not recognising AMUSBM as alternative input device with the same extension cable either !

Alex Rogers

Jun 08

Replying to

Strange. If the cable works when connected to the laptop then the cable is fine. I use the same USB-C to USB-A adaptor and it works fine on an iPad Pro. The switch has to be in DEFAULT or CUSTOM to appear as a USB microphone.

Alex Rogers

Jun 08

Hi Martin,

I’ve tried this app on an iPad Pro with both a micro-USB to USB-C cable, and a micro-USB to USB-A cable with the Apple USB-A to USB-C adaptor, and both work fine.

Do you know what firmware version the AudioMoth USB Microphone is using? Is the USB cable definitely suitable for data transfer - some USB cables are just charging cables with no data lines.

The 'SpectrumView' app only seems to support recording and viewing at up to 48kHz. On iPad Pro I use the ‘Ultrasonic’ app which supports recording at high frequencies to capture bats.

Alex

Edited