Things I've Built
Qip Solar Charger
External battery with a built-in solar panel to recharge the battery. It can also be charged with an MicroUSB cable.
iPhone Dock
Minimalist dock for iPhone, with Lightning connector.
EcoBici Tracker
Winner project at HackCDMX 2015. It's a device that allows Mexico's government to track the distance traveled by each bycicle, and upload the data to servers.
Lutetium