One more Freestyle Libre Alarm
This project contains the hardware (schematic and PCB layout), micro-controller software (C++ for an Atmel ATtiny 4313), and mechanics (openscad file for 3D printers) of a small device that MAY be useful for users of Freestyle Libre glucose sensors. The device beeps if the glucose levels reported by the sensors exceed certain thresholds.
The device is only reading the sensors and can therefore co-exist with the standard reader shipped by Abbott. As a consequence the device cannot initialize new sensors. The primary purpose of the device is to be worn at night and to warn the user about excessive glucose levels. The purpose is NOT to replace the standard Abbott reader. In fact, the first action after an alarm shall be to determine the glucose level with either the standard reader, or even with a traditional blood glucose measurement.
The PCB of the device is prepared for an Enocean TCM 310 module that can transmit the glucose levels and the battery level to a receiver withing, say, 20 meters. Low-cost receiver modules, for example for Raspberry Pis are available. Alternatively, one can used a second OmFLA PCB as receiver and connect it to the serial port of a Raspberry Pi or of some micro-controller.
DISCLAIMER: This device is not a medical device and does not follow any established standards for medical devices. It is a purely experimental device and only meant to demonstrate technical possibilities.
The information in this project is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
A distinguishing feature of the device described in this project is that it works without any additional devices like expensive smart watches or even smart-phones. One of the design goals was low cost as opposed to high functionality, and the cost of the components for the prototype were well below US-$ 50.00 (including the RFID reader, but excluding the PCB and the optional TCM 310 radio transceiver).
We are offering OmFLA PCBs to diabetes self aid groups and to individuals suffering from diabetes at roughly our purchase price + shipping, please send an email to omfla@jürgen-sauermann.de for details.