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The Spresense extension board provides pin compatibility with selected Arduino shields along with an SD card slot, a headphone jack and multiple microphone pins.
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The Spresense extension board is a board which extends the interfaces compared to the Spresense main board. The Spresense main board and the Spresense extension board are connected by a Board-to-Board (B-2-B) connector. The Spresense extension board has Arduino Uno pin compatible shape and pin socket locations. However, there are some differences compared to the Arduino Uno. For details, please refer to the Differences between Spresense and Arduino Uno.
The Spresense extension board has the following connectors in addition to Arduino Uno compatible pin sockets.
3.5 mm headphone jack
Micro SD card
An extra USB port
Multiple microphone pins
· 3.5 mm headphone jack
· Micro SD card
· An extra USB port
· Multiple microphone pins
B-2-B connector 100 pins connector for the main board.
Micro SD card.
Micro USB Type-B connector. It can provide USB MSC (Mass Storage Class) function allowing access to the SD card on the extension board directly from the PC.
Headphone 3-pole 3.5mm jack.
GPIO voltage can be set to 5V or 3.3V by using a jumper on JP1. A standard 2.54mm pitch jumper should be used. This one will be supplied with the extension board.
JP10 - pins 3 to 16
Microphone connector. These pins connect analog or digital microphone. Please refer How to use microphones for details.
JP10 - pins 1 and 2
You can disable UART2 on the extension board by closing pin 1 and 2 on JP10. This allows UART2 on the main board to be used at 1.8V I/O. No jumper is shipped with the extension board, a 2.54 mm pitch jumper should be used.
Jumpers to support digital microphones on JP10. Please refer How to use microphones for details.
1 x Spresense extension board