The Sony Spresense extension board is a board which extends the interfaces compared to the Spresense main board. The Spresense extension board has Arduino Uno pin compatible shape and 100 pin socket locations for connecting main-board or jumper wires. Besides, the board integrates 3.5 mm headphone jack, Micro SD Card Slot, USB port and Mic port. Easy to assemble, plug-and-play.
Spresense Extension Board Pinout
The following block diagram shows the extension board design.
How to attach the Spresense extension board and the Spresense main board
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