  This paper presents the design flow of an IoT human machine touchless
interface. The device uses embedded computing in conjunction with the Leap
Motion Controller to provide an accurate and intuitive touchless interface. Its
main function is to augment current touchscreen devices in public spaces
through a combination of computer vision technology, event driven programming,
and machine learning. Especially following the COVID 19 pandemic, this
technology is important for hygiene and sanitation purposes for public devices
such as airports, food, and ATM kiosks where hundreds or even thousands of
people may touch these devices in a single day. A prototype of the touchless
interface was designed with a Leap Motion Controller housed on a Windows PC
exchanging information with a Raspberry Pi microcontroller via internet
connection.
