If you need an electronic ‘key’ for your MicroMite project then this iButton is what you require. This is a low cost, durable identifier that can be read by using a single MMBasic command dedicated to the 1-wire protocol. A range of optional key fob holders allows easy attachment to a keyring.
This iButton touch reader is recommended to read DS1990A iButtons. It effectively connects the DS1990A momentarily to the MicroMite so that the unique ID in the DS1990A can be read. A bi-colour LED is embedded and can be driven directly from the MicroMite to indicate various statuses.