Design of Electronic Case History System Based on iButton
Zhang Han · Ordnance Industry Automation · 2006
Based on iButton electronic case history system, the DS 1991 chip and AT89s52 were adopted. The system operation process includes reading sequence number, reading cipher key sub-area, and writing cipher key sub-area. When no user reading cards, the system was in dormant. The personal information and healthy conditions of users were recorded in cards by manager at first. When seeing a doctor, the user put the card on the forehead, and card usefulness and card identification were checked through CRC checking program code of 1-wire. After identification, the corresponding information in card was read and displayed in LCD and PC.