The hookup Guide shows 17 GPIO pins, however the product showcase video mentions 19.
Where are the other 2 GPIO pins
By inspecting the [schematic I see only 17 available pins. This must be a mistake in the video, I will pass it along to be corrected. Thanks!](https://cdn.sparkfun.com/assets/3/a/d/4/d/Artemis-Nano2.pdf)
Thanks for the reply, You will want to change the Feature List to 17 as well
Can you recommend an Arduino based board for my project
I use a few interrupts,
I have exceeded the pin count on the Arduino Pro Mini 328, need 19 but could use 21 if available.
I do not want headers
I like the idea of more grounds as seen with the Artemis Nano
For now, I don’t need Bluetooth but could make use of it
Hi David,
Something like the [SparkFun Pro nRF52840 Mini may work for you. It has plenty of I/O pins and nearly all of them have pin-multiplexing capability so they can be defined to function in many different ways. Our [Hookup Guide for that board will have more information on that and how to get started with it. It also has ground rails similar to the Artemis Nano.
A couple other options you may want to look at would be the two Thing Plus boards: [ESP32 WROOM and the [SAMD51. Both of those will also have Hookup Guides similar to the Pro nRF52840 Mini linked on their respective product pages if you want to learn more about them.
I hope this helps you find the right microcontroller for your project!](https://www.sparkfun.com/products/14713)](https://www.sparkfun.com/products/14689)](https://learn.sparkfun.com/tutorials/sparkfun-pro-nrf52840-mini-hookup-guide)](https://www.sparkfun.com/products/15025)