Hello, @herve98-0-1
Try step 0 on this link:
https://www.mac-usb-serial.com/docs/support/troubleshooting.html
"This check is not dependent on any driver, and only verifies if OS X recognizes the device at USB level. If the device doesn’t show up, it is either a broken cable or broken chip."

Some USB cables work for charging but not for data... So I would try with a different cable just to be sure.

Hello, @RomainPC-0-1-1-1-1-1-1
I haven't actually tried it, but you could use git submodule or subtree.
I agree that it would be more interesting to track the folder that contains the applications, so you can create several examples.

Tip:
When you have a successful application, run $make savedefconfig to save the sdk configuration of that application. A defconfig file will appear under the sdk directory and that might be worth saving too.

How would you want to use both CLI and IDE?
The way they do the configuration of the SDK is slightly different and I believe to create an application in the IDE and be able to flash that with the CLI you would need to create the Kconfig file and then take a look at this part of our documentation:
https://developer.sony.com/develop/spresense/docs/sdk_set_up_en.html#_add_to_a_different_directory
(Assuming this is what you want to do)

I tried to disconnect the main board from the extension board and now the main board & extension board turns on. Solution solved! 😃

Hello, @nimish
I haven't found any evidence of compatibility in our documentation or in the CXD56 user manual, which you can find here:

https://www.sony-semicon.co.jp/e/products/smart-sensing/spresense/

Hey, @rauna
If you don't mind, I'll copy the same answer I gave in the Hackster discussion board 🙂

Have you already checked this example? -> https://developer.sony.com/develop/spresense/docs/sdk_tutorials_en.html#_tflmrt_sample_application

There is a note on section 5.1.4. Operation check about using your own model.

Since you have already trained your model, you can skip section 5.1.2. Train a TensorFlow Lite model.

I believe you can use this application, but modify how it processes the output tensor.
This is the code for the application:
https://github.com/sonydevworld/spresense/blob/master/examples/tflmrt_lenet/tflmrt_lenet_main.c

The output tensor is
TfLiteTensor *var = tflm_runtime_output_variable(rt, 0);

Here you can see some helper functions to work with the output tensor:
https://github.com/sonydevworld/spresense/blob/master/sdk/modules/include/tflmrt/runtime.h
Like tflm_runtime_output_num, tflm_runtime_output_shape, tflm_runtime_output_ndim, etc..

Hey, @marvinwright_-0
unfortunately, still no support for Spresense in Matlab.

Hello, @sisimonis-5-1-1
Thank you for sharing your solution. It might be helpful for other developers in the future.

@RomainPC-0-1-1-1-1-1-1
Thank you for pointing it out!

@mithun
Perfect!
I'm glad to hear that.

@rauna Thank you very much for your kind reply.
The board appears as /dev/ttyUSB0

Hey, @samasen-0-1-1

The camera example already enables the LCD device, so you don't even need to write that.
tools/config.py examples/camera is enough.

By default, the example uses the extension board. The picture you showed looks like the correct setup to me. Those are the pins I used last time I hooked an LCD display to my spresense board.

Thanks for notifying us, this should be fixed in the next publication.

@Armaghan This is perfect. Thanks!

@CamilaSouza Thank you for your kind reply.

@KamilTomaszewski Thank you!

Hey, @Larry

So here is a fix to be able to import the math.h library in the audio recorder example:

Please edit the Makefile inside the audio_recorder example folder and add the following line to the "# Audio Example flags" section:
CXXFLAGS += -D_GLIBCXX_INCLUDE_NEXT_C_HEADERS

This is what that section will look like after this modification:

# Audio Example flags CXXFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" "$(AUDIODIR)"} ifeq ($(CONFIG_EXAMPLES_AUDIO_RECORDER_USEPREPROC),y) CXXFLAGS += ${shell $(INCDIR) $(INCDIROPT) "$(CC)" "worker$(DELIM)userproc$(DELIM)include"} endif CXXFLAGS += -D_POSIX CXXFLAGS += -DUSE_MEMMGR_FENCE CXXFLAGS += -DATTENTION_USE_FILENAME_LINE CXXFLAGS += -D_GLIBCXX_INCLUDE_NEXT_C_HEADERS

After that, in the terminal, do
$ make distclean
$ tools/config.py examples/audio_recorder
$ make -j

You should be able to use math.h normally after that.
Please let me know if it worked for you too.

Hello, @Stanton
This section in our documentation talks about how to debug with ICE
https://developer.sony.com/develop/spresense/docs/sdk_set_up_ide_en.html#_ice_debugging

@nimish

Hey!
For the first one you can search online for "pcb nylon mini spacers" and look for a 2mm one.
If you look for "Nylon Studded Fixing Spacer" you can find one with a little screw on the bottom.
Digikey has a section on "Nylon PCB Standoffs and Spacers" where you can find the standoffs.

Let me know if you were able to find them.

@Xander-0

Hm.. the message from the serial terminal does not tell me much since I don't know what your code is supposed to do, but at least we can see the board is not dead (assuming no message should have appeared from the main core).

Follow up questions:

Does the same thing happen (no code running) when you power through the EXT_VDD pin?

What are you using as power supply before the voltage regulator? Is it a battery? Please give specs 🙂
I found this note in the spresense documentation:
"The Spresense can be powered by a USB battery pack. Some USB battery packs require a minimum load current and Spresense may take less than this current, which will cause the USB battery pack to turn off after a few seconds. For reliable USB battery pack operation choose a battery pack that has an 'always on' feature or use a USB 'keep-alive load'."

Can you maybe post a picture of your whole system connected?
(Battery, voltage regulator, spresense board)