A portable wireless body sensor data logger and its application in video capsule endoscopy

•Graphical LCD for viewing real time color images, graphs, charts etc.•Touch screen with key pad based graphical user interface.•High speed 2.4 GHz wireless connectivity with bio sensor.•Data store in two microSD cards using FAT16 file-system.•Data transfer to PC or Smartphone using SD card reader, USB or Bluetooth.

Due to the advancement of low power miniature electronic devices, there is growing interest of physiological data sensing and recording using wireless body sensor networks. The paper presents the design of a portable physiological data logger that includes rechargeable battery, wireless radio frequency and Bluetooth connectivity, and graphical display with touch screen capability. The target application is video capsule endoscopy. Image data are logged in micro SD cards which can be easily transferred to PC or Smartphone using SD card reader, USB interface or Bluetooth wireless link. The hardware design is general and can be used in various medical or industrial applications by changing only the firmware of the microcontroller. The design is prototyped in 109 × 107 × 20 mm printed circuit board (PCB). Tests with animal tissues have been conducted to demonstrate the performance advantages of the data logger. A demonstration of wireless heart pulse monitoring and data logging is also presented.