Trying to open proprietary medical sensors and connect them to the Internet.

Connecting a personal medical sensor device to the Internet enables storing measurements over time (compared to a single measurement displayed on the device display). A connected sensor is thus more valuable than a stand-alone device. Connected sensors do exist, but are often quite expensive. On the other hand, Bluetooth modules and Bluetooth enabled Smartphones are readily available and can act as a cheap gateway to the Internet.

[Oct 2012] “voodoo” interface, oscilloscope measurement:

[Nov 2012] intercepting the i2c bus:

[Nov 2012] talking to the EEPROM (i2c multi master setup):

• Weinberger KP-6241 (CHF 25 at Media Markt)
• BlueSMIRF Bluetooth Module (https://www.sparkfun.com/products/582)
• Arduino Nano
• Nexus S Android Smartphone with Bluetooth, Wifi, 3G

• Open the medical sensor device housing [DONE]
• Find a way to intercept data sent to LCD display [DONE]
• Detect signals sent to LCD display with multimeter [DONE]
• Detect signals sent to LCD with oscilloscope [DONE Oct 2012]
• Attach wires to LCD display, to do the measurement with an Arduino [DONE Oct 2012]
• Decode communication protocol between device and LCD display [FAILED Oct 2012]
• Attach wires to i2c test points SCL and SDA [DONE Nov 2012]
• Decode signals sent over i2c when storing measurements with protocol sniffer [DONE Nov 2012]
• Read values with Arduino via i2c from EEPROM [DONE Nov 2012]
• Setup Bluetooth module to send measurements from Arduino [DONE]
• Receive measurements sent via Bluetooth with (Windows) Laptop [DONE]
• Receive measurements sent via Bluetooth with Android [DONE]
• Make measurements available on the Internet [TODO]
• Plan B: use OCR (e.g. this Google API) to read med device display with Android camera [TODO]
• Integrate parts, add portable battery [TODO]
• Repackage device [TODO]

• Screwdriver
• Multimeter
• Soldering Iron
• A Physics Lab… [post event note ;)]
• Oscilloscope [Oct 2012]
• Logic Analyzer [Nov 2012]

• @drdol
• @der_graf
• @frescosecco
• Jonas
• @tamberg

• BtSoftwareSerial.ino (Send data via Bluetooth from Arduino)

• http://make.opendata.ch/forum/discussion/57/open-data-for-your-health#Item_12
• http://quo.vadis.stojkovic.ch/hacking-a-weighing-scale/ (How to scrape an LCD display)
• https://www.esskabel.de/produkt/ada-flex-30p-050-set/ (FFC adapter board, not used)
• http://arduino.cc/playground/Code/I2CEEPROM
• https://www.instructables.com/Weather-proof-Bluetooth-capable-RFID-reader/
• https://developer.android.com/develop/connectivity/bluetooth
• https://www.flickr.com/photos/tamberg/sets/72157631641565782/ (all pictures CC-BY-SA)
• http://www.azumio.com/apps/heart-rate/