GOLD (Glucose Optical LED Detector) Group 11 BY: Samuel Bigio EE Andrew Elkommos  EE Mitchell Munro EE Victoria Rodriguez EE  Victor Bassey CPE  Arjun Watane CS Justyn Chabowski-Carpino CS

Absorption Spectroscopy Variables Pulse Oximetry Thickness of Ear Perspiration of Skin Temperature Movement   Click to add text 1550 nm 

Transmission Vs Reflection

Photodiode  And NIR LED MarkTech hIGH sPEED ingAaS pHOTODIODE  led1550e uLTRA bRIGHT nir led through HOLE vs. smd? 

BLock Diagram of prototype

PHOTODIODE TESTING circuit LTC1150 - Low input bias Photodetector Circuit  LED & Photodiode rig with Glucose Solution beakers

Sampling Process Remove heart rate variations by sampling RED IR and NIR, 20 times in 100ms  20 * each LED = 120 samples  PWM : Low, Mid And HIGH  for Spectral range Ambient Photodiode LED Reading Taken Prior of the light in the room Statistical Database With (Length of ear, oximetry, Heart Beat etc.)

ISSUES WITH ADC Analog Devices AD7714 TI ADS1271 Released as early as 1998 Released in 2007 Three Differential Analog Inputs One Differential Analog Input On-chip Registers for Filters, Gains, etc. No Registers to Program Through Hole Surface Mounted Low Sample Rate(1 kSPS) High Sample Rate (105 kSPS)

ADC (Analog to digital Converter) 24 Bit Resolution High Sampling Rate Differential Analog Inputs High Precision SPI Communication Interface

Afe4404 Integration

power Battery Capacity: 1000 mAh Buck Topology 12 hr. Duration 3.6V & 5V 12 hr. Duration Adjustable output Supply 1  LED  Photodiode  3 op-amps  MSP430  Supply 2  ADC

GOLD ANdroid application Glucose monitoring application Multi-user support Glucose measurement logging Database Encryption

Database The GOLD Android application uses a local database to store the user's credentials for multi-user support and glucose information. This database is secured using the SQLCipher SQLite extension. There are two main tables used for the application, one to store the user, and the other to store glucose information.

Bluetooth Used to communicate between the MSP430 and Android application. This will transfer the readings that we get from our pulse oximeter. Uses the HC-06 Bluetooth module.

PCB Design Manufactured by 4PCB. Design implements LEDs and Photodiode electronics. 24 Bit ADC to be interfaced using SPI with an external Microcontroller. Design Rule Checks and Constraints set for 5 mil minimum spacing. Differential Pair routing to input for ADC. Dimensions: 2.5x2.2 square in.

Budget Description Cost LED $17.95 Photodiode $31.43 Bluetooth Receiver $10.00 ADC $11.52 PCB Parts $80.92 PCB $40.00 AFE4404 FREE Total $191.82

Responsibilities Primary Secondary Power Victoria Mitch LED/Photodiode Sam Andrew PCB Design Algorithm CS Victor Bluetooth App Mechanical Design

Progress

Future Goals Test PCB Integrate AFE4404 with our own PCB Mechanical Design (Ear vs. Finger) Sensor Calibration