I started this project a while ago, but then my school began to pick up and I needed to take a break. I have designed the hardware and have the basic concepts down but it still needs to be programmed. I may be taking a different approach to the programming aspect of it in terms of how it will actually determine the amount of glucose.
The current system consists of a few components, an InGaAs photodiode, 8 LEDs(2 x Green, 2 x NIR @ 1550nm, 1 IR @ 960nm, 1 Red) an Atmega328p, and the circuits required to run those. Also it contains a small LiPo in order to be able to test, or take training data. Right now it is held together with an elastic band which helps it clip onto an ear. It is two separate circuit boards and the ADC is channeled through an MCP3421 and then i2c goes across a connector at the bottom which also supplies the regulated 3.3V to the arduino.
The case was printed at Shapeways.
Adafruit featured my project today. I have received lots of emails pertaining to helping out with the project, Its really awesome! I need to clean up the project a bit and post it to GitHub so there is more access for everyone. I will admit I'm not the best when it comes to doing that, so I will try my best to get it all set up(Time is a huge factor). There are lot of people eager to help program, or gather data, so I need to get the design sorted out before I tell people to start building these!
Realized that I should have(a long time ago) ordered some high quality LEDs. The standard inexpensive ones I always get are not cutting it. Did a brief search on Digikey and found some serious ones for the job that should be a lot better and also are still 0603 so no need to order a new board.