Hi @tony!
Could you please give some more details about what you're trying to do? Are you recording to the SD-card so you can bring it over to the PC, or are you trying to use some network connection or something else?

@aisyjeff Difficult to say, I don't have any numbers and it depends on what microphones you're using, what you recording to sleep ratio is etc. Either way, if you intend to record continuously for 12 hours it will use quite a bit.

Hi @aisyjeff!

Unfortunately we don't have any numbers for that specific use case.

There are two basic ways you can measure it:

• When powering the board using USB, you can use some specific USB power measurement gadget (there are lots on Amazon etc)
• When powered through the battery connector you could use a multimeter or some other power supply/measurement tool

Maybe this tutorial could be helpful. It is for Arduino but the principle should be the same.

Optimally you'd want some kind of logger so you can control exactly what/when to measure and calculate some kind of average consumption while doing the recording. In our power saving tutorial for example, we used an Ooti device, which is a very convenient but somewhat pricey tool for these kinds of things (https://www.qoitech.com/otii/).

Hello @jayaprasad,

I'm sorry for the slow response. I found a previous post in the forum regarding this module in the SDK that you might find interesting:
https://forum.developer.sony.com/topic/104/how-to-bring-up-the-network-in-spresense?_=1623396622282

I also found an implementation that uses the ESP8266 in an SDK app - I actually think it is the same one that is mentioned in that other thread. if you send me a private message with your email address, then I will share the source code it to you.

BR
Tobias

@aaronm Awesome that you got it working and thanks for sharing your findings!

Hi @Jodie_space!

Unfortunately there is no built in support for recording to a video file on the SD card. There are two camera data streams available: one for taking still pictures and one for showing a preview video like you have in a "regular" digital camera. No support for actual video recording.

Now, it doesn't say exactly what your project is supposed to do or what you want to use the video for, but perhaps it would be possible to generate the actual video file as a post processing step? This might work If you don't intend to use the actual video file on the Spresense board itself after recording. In that case you could save the frames from the preview video as separate image files on the SD card instead of displaying them on a display etc. Then, when the recording is finished, plug the SD card into your PC instead and combine them into a video file using an external tool such as ffmpeg.

This workaround might not work for you - it depends on what you want to accomplish - but it is the simplest solution I can come up with.

I found this similar thread that might be interesting to you:
https://forum.developer.sony.com/topic/133/capture-video-from-spresense-camera-board-using-arduino/7

BR
Tobias

Hi @monotaskr,

Nice to hear about your ideas! Unfortunately I am not able to help out with the actual project design so I will just give some generic recommendations to help you get started

As a first step I'd suggest you have a look at the sample applications available in the Spresense SDK and/or Arduino library if you haven't already. Getting an idea of how audio works in Spresense and what it can do might help you decide the scope and direction of your project. The audio system might seem a bit complicated at first, but start playing around a bit with the samples to get a feel for it. There are several audio related apps in both the Arduino and SDK development environments, but remember that they are just examples. Don't let their scope limit you!

Then you can start to think about what sampling devices you think are suitable for your project and figure out what adaptations might be needed to connect them to the Spresense mic inputs.

Here are some general pointers to interesting audio related sections in the documentation:
https://developer.sony.com/develop/spresense/docs/sdk_developer_guide_en.html#_audio_subsystem
https://developer.sony.com/develop/spresense/docs/arduino_developer_guide_en.html#_audio_library
https://developer.sony.com/develop/spresense/docs/hw_docs_en.html#_how_to_use_microphones

You might also find this forum thread interesting if you haven't seen it already:
https://forum.developer.sony.com/topic/172/microphone-array-suitability/2

I hope it helps!

BR
Tobias