All regular pins default to input with pulldown enabled, so you can tie them to ground or leave them unconnected.

@misterlisty The LoPy (more specifically the L01 OEM module which is meant for production) is already used in a range of commercial products, for example: Victron Energy: https://www.victronenergy.com/panel-systems-remote-monitoring/ve-direct-lorawan (background: https://pycom.io/great-minds-think-alike/) Tenna: https://pycom.io/modern-asset-tracking/ Safe Water: https://pycom.io/temperature-sensing-for-legionella-control-showcase-mwca17/ All these started as a LoPy prototype as @bmarkus said and then were developed/tuned for commercial use using the L01 OEM production module. The scale-up process from LoPy prototype to product using OEM modules is something Pycom cares a lot about and looking to simplify. But even now it's already happening.