phyx was developed in late 2002. It consisted of a portable timeclock and access control system using Dallas iButton technology. The employee entry and access times were recorded in an external Atmel DataFlash memory by the system's Freescale MC68HC908AB32 microcontroller, and sent at specific times to a remote telephonic central using a low cost DTMF modem. For validation purposes, the monthly time database was also kept in the non-volatile memory of the iButton for each employee. The system also featured event logging connection to a PC, battery backup with integrated charger and remote timer programming and firmware upgrades.
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