The Design Of Passive RFID Smart Bracelet

This paper presents the design of smart bracelet composed of RFID chip M24LR04E-R and STM8L152C6T6 ultra-low power microcontroller, electronic ink screen and PCB antenna. Design prototype have achieved that when the PC-side host computer to send commands, the STM32 microcontroller and CR95HF RF chip reader composed can have short-range wireless communication with the bracelet ( distance <= 5cm). The wristband electronic ink screen can display the received Information. The highlight of the design is that the M24LR04E-R chip can not only be used as an RFID passive tag, but also has the ability to collect energy and conduct energy output from the electromagnetic field during communication. When it has the wireless communications, the M24LR04E-R can be a voltage source to supply the power to the bracelet. This progress can achieve the passive design of the bracelet. The electronic ink screen used has the characteristic that the display content does not disappear after power-off, and the information displayed on the wristband can be kept for a long time.