It is a picture of the surface. The main body is much smaller than Arduino or Raspberry Pi, slightly smaller than mbed, and slightly larger than the Intel Edison main board. If you attach an expansion board, it will be the same size as Arduino.
It is a picture of the back side. Connector similar to Intel Edison which is called B2B connector is attached to the back of the main body. The Intel Edison connector have specified that the maximum insertion and removal number is 20 times, but the maximum number of insertion and removal of Spresense have not been announced.
Then, connecting the main unit to the expansion board, we can use a high-performance board microcomputer with Arduino interface.
Using the Arduino IDE, we first tried blinking the body LED. The four LEDs flash in order. This worked fine.
Next, I tried the audio function, and I encountered an error with the message “The MP3 playing library can not be found” on the console monitor in Arduino IDE, though I have placed the library on the microSD card.
Next, I tried the function to read and write microSD card. At first I could not read the microSD card, but I can read it more than once while trying. There were times when it worked and when it did not work. There seems to be compatibility between microSD card and Spresense.
Finally, I tried the GNSS function. Sample sketches of GNSS functions include GNSS reception status indication and GPS tracker to save GNSS reception data in microSD card in NMEA format, but here we tried the former outdoors. Although it says that the manual captures GPS satellites in a few minutes, I gave up because I could not catch even after waiting for 10 minutes It was.
I did not go well this time, but I would like to try it again.