SPO2 MAX30102 Blood Oxygen Concentration Sensor

The

MAX30102

is

an

integrated

pulse

oximeter

or

SO2

sensoro,

and

heart

rate

monitor

biosensor

module.

MAX30102

SO2

integrates

a

red

LED

and

an

infrared

LED,

photodetector,

optical

components,

and

low-noise

electronic

circuitry

with

ambient

light

suppression.

class='font-size-24

mb-3'>Features

Of

MAX30102

SO2

Sensor: The

MAX30102

features

a

1.8V

power

supply

and

a

separate

5.0V

power

supply

for

internal

LEDs

for

heart

rate

and

blood

oxygen

acquisition

in

wearable

devices,

worn

on

the

fingers,

earlobe,

and

wrist.

The

standard

I2C-compatible

communication

interface

can

transmit

the

collected

values

to

the

Arduino,

KL25Z

and

other

microcontrollers

for

heart

rate

and

blood

oxygen

calculation. In

addition,

the

chip

can

also

shut

down

the

module

through

software,

the

standby

current

is

close

to

zero,

and

the

power

supply

is

always

maintained.

Because

of

its

excellent

performance,

the

chip

is

widely

used

in

the

Samsung

Galaxy

S

series

mobile

phones. Compared

with

the

previous

generation

MAX30100,

the

chip

integrates

a

glass

cover

to

effectively

eliminate

external

and

internal

light

interference

and

has

the

best

reliable

performance. class='font-size-24

mb-3'>The

Main

Parameters: LED

peak

wavelength:

660nm/880nm LED

power

supply

voltage:

3.3~5V Detection

signal

type:

light

reflection

signal

(PPG) Output

signal

interface:

I2C

interface Communication

interface

voltage:

1.8~3.3V~5V

(optional) Board

reserved

assembly

hole

size:

0.5

x

8.5mm class='font-size-24

mb-3'>Pin

Description: VIN:

main

power

input

terminal

1.8-5V 3-bit

pad:

Select

the

pull-up

level

of

the

bus,

depending

on

the

pin

master

voltage,

select

1.8v

or

3_3v

(this

terminal

contains

3.3V

and

above) SCL:

the

clock

connected

to

the

I2C

bus; SDA:

data

connected

to

the

I2C

bus; INT:

Interrupt

pin

of

the

MAX30102

chip; RD:

RED

LED

ground

terminal

of

MAX30102

chip,

generally

not

connected; IRD:

The

IR

LED

ground

of

the

MAX30102

chip

is

generally

not

connected; GND:

Ground

wire. class='font-size-24

mb-3'>Principle

Description:

Light-dissolving

method:

measuring

the

pulse

and

blood

oxygen

saturation

by

using

human

tissue

to

cause

different

transmittance

when

the

blood

vessel

beats; Light

source:

a

specific

wavelength

of

light-emitting

diode

selective

for

oxyhemoglobin

(H

bO

2

)

and

hemoglobin

(

Hb

)

in

arterial

blood; The

transmittance

is

converted

into

an

electrical

signal:

the

change

in

the

volume

of

the

arterial

pulsation

causes

a

change

in

the

transmittance

of

the

light.

At

this

time,

the

photoelectric

variator

receives

the

reflected

light

from

the

human

tissue,

converts

it

into

an

electrical

signal,

and

amplifies

and

outputs

it. class='font-size-24

mb-3'>Package

Includes: class='font-size-14

pl-3

ml-1

text-gray-110'>

1X

MAX30102

blood

oxygen

concentration

sensor

module

STM32

sensor

Code:

#include

#include

"MAX30105.h"

MAX30105

particleSensor;

//

initialize

MAX30102

with

I2C

void

setup() {

Serial.begin(115200);

while(!Serial);

//We

must

wait

for

Teensy

to

come

online

delay(100);

Serial.println("");

Serial.println("MAX30102");

Serial.println("");

delay(100);

//

Initialize

sensor

if

(particleSensor.begin(Wire,

I2C_SPEED_FAST)

==

false)

//Use

default

I2C

port,

400kHz

speed

{

Serial.println("MAX30105

was

not

found.

Please

check

wiring/power.

");

while

(1);

}

byte

ledBrightness

=

70;

//Options:

0=Off

to

255=50mA

byte

sampleAverage

=

1;

//Options:

1,

2,

4,

8,

16,

32

byte

ledMode

=

2;

//Options:

1

=

Red

only,

2

=

Red

+

IR,

3

=

Red

+

IR

+

Green

int

sampleRate

=

400;

//Options:

50,

100,

200,

400,

800,

1000,

1600,

3200

int

pulseWidth

=

69;

//Options:

69,

118,

215,

411

int

adcRange

=

16384;

//Options:

2048,

4096,

8192,

16384

particleSensor.setup(ledBrightness,

sampleAverage,

ledMode,

sampleRate,

pulseWidth,

adcRange);

//Configure

sensor

with

these

settings }

void

loop()

{

particleSensor.check();

//Check

the

sensor

while

(particleSensor.available())

{

//

read

stored

IR

Serial.print(particleSensor.getFIFOIR());

Serial.print(",");

//

read

stored

red

Serial.println(particleSensor.getFIFORed());

//

read

next

set

of

samples

particleSensor.nextSample();

} }

Second

code:

/*

Optical

Heart

Rate

Detection

(PBA

Algorithm)

using

the

MAX30105

Breakout

By:

Nathan

Seidle

@

SparkFun

Electronics

Date:

October

2nd,

2016

https://github.com/sparkfun/MAX30105_Breakout

This

is

a

demo

to

show

the

reading

of

heart

rate

or

beats

per

minute

(BPM)

using

a

Penpheral

Beat

Amplitude

(PBA)

algorithm.

It

is

best

to

attach

the

sensor

to

your

finger

using

a

rubber

band

or

other

tightening

device.

Humans

are

generally

bad

at

applying

constant

pressure

to

a

thing.

When

you

press

your

finger

against

the

sensor

it

varies

enough

to

cause

the

blood

in

your

finger

to

flow

differently

which

causes

the

sensor

readings

to

go

wonky.

Hardware

Connections

(Breakoutboard

to

Arduino):

-5V

=

5V

(3.3V

is

allowed)

-GND

=

GND

-SDA

=

A4

(or

SDA)

-SCL

=

A5

(or

SCL)

-INT

=

Not

connected

The

MAX30105

Breakout

can

handle

5V

or

3.3V

I2C

logic.

We

recommend

powering

the

board

with

5V

but

it

will

also

run

at

3.3V. */

#include

#include

"MAX30105.h"

#include

"heartRate.h"

MAX30105

particleSensor;

const

byte

RATE_SIZE

=

4;

//Increase

this

for

more

averaging.

4

is

good. byte

rates[RATE_SIZE];

//Array

of

heart

rates byte

rateSpot

=

0; long

lastBeat

=

0;

//Time

at

which

the

last

beat

occurred

float

beatsPerMinute; int

beatAvg;

void

setup() {

Serial.begin(115200);

Serial.println("Initializing...");

//

Initialize

sensor

if

(!particleSensor.begin(Wire,

I2C_SPEED_FAST))

//Use

default

I2C

port,

400kHz

speed

{

Serial.println("MAX30105

was

not

found.

Please

check

wiring/power.

");

while

(1);

}

Serial.println("Place

your

index

finger

on

the

sensor

with

steady

pressure.");

particleSensor.setup();

//Configure

sensor

with

default

settings

particleSensor.setPulseAmplitudeRed(0x0A);

//Turn

Red

LED

to

low

to

indicate

sensor

is

running

particleSensor.setPulseAmplitudeGreen(0);

//Turn

off

Green

LED }

void

loop() {

long

irValue

=

particleSensor.getIR();

if

(checkForBeat(irValue)

==

true)

{

//We

sensed

a

beat!

long

delta

=

millis()

-

lastBeat;

lastBeat

=

millis();

beatsPerMinute

=

60

/

(delta

/

1000.0);

if

(beatsPerMinute

<

255

&&

beatsPerMinute

>

20)

{

rates[rateSpot++]

=

(byte)beatsPerMinute;

//Store

this

reading

in

the

array

rateSpot

%=

RATE_SIZE;

//Wrap

variable

//Take

average

of

readings

beatAvg

=

0;

for

(byte

x

=

0

;

x

<

RATE_SIZE

;

x++)

beatAvg

+=

rates[x];

beatAvg

/=

RATE_SIZE;

}

}

Serial.print("IR=");

Serial.print(irValue);

Serial.print(",

BPM=");

Serial.print(beatsPerMinute);

Serial.print(",

Avg

BPM=");

Serial.print(beatAvg);

if

(irValue

<

50000)

Serial.print("

No

finger?");

Serial.println(); }

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• Tags: SPO2 MAX30102 Blood Oxygen Concentration Sensor