Hi, The AudioMoth USB Microphone configuration is persistent even if the microphone is unplugged. It is stored in the flash of the microcontroller alongside the firmware. In most use cases, you can switch to USB/OFF and configure the microphone with the AudioMoth USB Microphone App. The settings are then retained whenever you unplug and plug-in the microphone again.

You can also configure the microphone from the command line using the app described in the application note below. This app allows the configuration to be changed when the microphone is in DEFAULT or CUSTOM mode and acting as a USB microphone. https://github.com/OpenAcousticDevices/Application-Notes/blob/master/Configuring_the_AudioMoth_USB_Microphone_from_the_Command_Line/Configuring_the_AudioMoth_USB_Microphone_from_the_Command_Line.pdf The application can list connected AudioMoth USB Microphones and then configure them individually or collectively:

You can even put the AudioMoth USB Microphone into bootloader mode and then use the Flash App to update the firmware without having to manually change the switch setting.

It requires firmware version 1.3.0 or later, as this creates an additional interface on the microphone that allows the configuration to be updated. The AudioMoth-Live-App uses this interface to adjust the device gain whilst the microphone is running.

The command line application can be built from the source code in the GitHub repository: https://github.com/OpenAcousticDevices/AudioMoth-USB-Microphone-Cmd There are also pre-built installers for all platforms here: https://github.com/OpenAcousticDevices/AudioMoth-USB-Microphone-Cmd/releases/tag/1.0.1 Let us know if you have any problems.

Alex

1. Inside the plastic ziplock bag are two spare Gore GAW334 acoustic membranes. The membranes may need replacing over the lifetime of the case, depending on the deployment environment. For example, some insects and birds can potentially pierce the membrane surface over time. The installed membrane can be inspected by holding an open case up to a light source, if there are any pin holes of light passing through the membrane it will need swapping out.

2. If the case is placed facing upwards rain water will pool inside the cone, the AudioMoth IPX7 Case is designed to be deployed with the microphone facing horizontally. Placing it inside a ziplock bag should prevent this. There's a good discussion on using ziplock bags here and comparisons of how recording quality is affected here.

Hi, It might be possible to experiment, however, the current MEMS microphone footprint and port is manufactured as per the Knowles design guidelines. Alex