IEEE Consumer Electronics Magazine - January/February 2020 - 38

Smart Home Healthcare

Figure 4. Conceptual overview of iGLU.

data (blood glucose values) storage, patient
monitoring, and treatment.

DESIGN AND PROTOTYPING of iGLU
The proposed device based on NIR spectroscopy uses two short wavelengths in three channels. Each channel is embedded with emitters
and detectors of specific wavelengths for optical
detection. The data are collected and serially
processed by 16 bit ADC with sampling rates of
128 samples/s. The flow of data acquisition for
iGLU is shown in Figure 5.

Approach for Glucose Molecule Detection
Glucose molecule vibrates according to its
atomic structure at specific wavelengths. It is
observed that absorbance and reflectance
are sharper and stronger in short wave NIR

Figure 5. Process flow data acquisition for iGLU.

38

Figure 6. Circuit topology of proposed device.

regions.22 The absorption peak of glucose spectra at 1,314 nm has been analyzed.23 The noninvasive blood glucose measurement using 850,
950, and 1,300 nm has been implemented.15 The
940 nm wavelength for detection of glucose molecule has been identified.24 NIR spectra of
sucrose, glucose, and fructose are elaborated
with CH2 , CH, and OH stretching at 930, 960, and
984 nm, respectively.25

Proposed Module for Data Acquisition
A 2-Layer PCB has been developed to embed
infrared emitters (MTE1300W for 1,300 nm,
TSAL6200 for 940 nm, and TCRT1000 for 940 nm)
and detectors (MTPD1364D for 1,300 nm, 3004MID
for 940 nm, and TCRT1000 for 940 nm) (See
Figure 6). The hardware is designed for data acquisition from emitters, detectors, and ADC with 5-V
dc supply. Accordingly, compatible passive components have been chosen. Detectors with daylight blocking filters are packaged and not
affected by sweat. ADS 1115 with 860 SPS, 16 bit,
I 2 C compatible and single ended is controlled
through microcontroller ATmega328P and is used
to convert the data (in Volts) from all channels in
decimal form. The noise power and signal-to-noise
ratio (SNR) have also been found at 0.08 and
25.2 dB, respectively, which show the minimum
noise level.
A Specific Prototype of the iGLU
Absorption and reflectance at 940 nm and
absorption at 1,300 nm are used for the detection of the glucose molecules. The detector's
voltage depends on received light intensity.

IEEE Consumer Electronics Magazine



IEEE Consumer Electronics Magazine - January/February 2020

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