DeveloperWorld

Hi @Furt-Tech

Maybe this post will clear some of your questions:

how-to-equip-spresense-with-wifi-connectivity

BR
Karl

Hi ,
Please find the answers here:

1. You can capture 8 channels digital simultaneously at 19khz 24bit. But if you want to record the sounds, please watch the bus bandwidth to the storage. When you record 8 channels of 192khz 24bit, you need to have the bandwidth of 192kHz x 32bit x 8channels = 6.144 MBytes/sec to the storage. In many cases, the bandwidth of SD cards is not stable to keep the performance due to the mechanism of the file system. If you want to capture stable sounds, you need to measure the actual performance of the storage that you are using. Please check the throughput from microphones to your storage beforehand.

2. It depends on the system. If you will use the same characteristic of digital microphones, I believe it can keep the phase coherence.
   Please see the connection of digital microphones and Spresense below:
   
   As you see, Spresense provides the same clock to digital microphones. Please see the capture timing of microphones below:
   

The data at the same timing from microphones are serialized at the same time. It means if the outputs from the digital microphones are generated at the same time based on the clock provided from Spresense, it will keep the phase between the microphones.

I hope this helps!

@grolschie did not know about that one, and missed it then I was looking. But yes, that and audio/getSpeakerSettings (v1.0) will probably help you do what you want and more... there is a loot of settings there...

@grolschie as I suspected there is no way to do this via the API, it is seen as a pre setup functionality and nothing that should be needed to be changed once setup.

I don't think this is possible to control this via the API, it is not done via the setActiveTerminal at least, I will have to ask to confirm.

@Gary-L said in Burning Bootloader error:

While trying to run the burning bootloader on the Arduino IDE I get the error below. Looking for direction on diagnostic approach to resolve

Do you get this every time you retry?
What os do you use on your PC?

BR

1. Update the Spresense Arduino library to the latest version.
   a. Open Board Manager

b. Update to the latest version

2. Open the camera example in the Arduino IDE.
   

3. Change the image size to 5M.
   

4. Change Memory to 1536KB
   

5. Change the JPG_COMPRESS_RATIO to 9.
   a. Open Camera.cpp file:

• Windows: %userprofile%\AppData\Local\Arduino15\packages\SPRESENSE\hardware\spresense\2.0.1\libraries\Camera\Camera.cpp
• Linux: ~/.arduino15/packages/SPRESENSE/hardware/spresense/2.0.1/libraries/Camera/Camera.cpp
• MacOS: ~/Library/Arduino15/packages/SPRESENSE/hardware/spresense/2.0.1/libraries/Camera/Camera.cpp

b. Change the JPG_COMPRESS_RATIO from 7 to 9:

6. Upload camera sketch to Spresense.

@yokonav my short answer with a bit of guessing is that this should be possible but it would be close to impossible to get certain parts to get to work, like GNSS that is provided as a binary.
BR
Karl