Getting data from a digital blood pressure monitor

Projects General Guidance
1

Hello, I am trying to get data from a digital blood pressure monitor using this video as my reference HOW TO CONNECT ARDUINO TO BLOOD PRESSURE SENSOR MONITOR - I2C EEPROM, button and valve check (3/6) - YouTube I have the same blood pressure monitor but upon opening the device I see that the board is different. I don't think it has an eeprom or I just can't identify it. Can you guys help me.

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photo_6131879381086352050_y721Ă—1280 127 KB

2

The six leg pressure sensor is a sphygmomanometer.

20230402_010513
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31fI5YQy9ZS.AC_UF1000,1000_QL80_FMwebp933Ă—1000 27.7 KB

3-Generic-Pressure-Sensor-Pinout
3-Generic-Pressure-Sensor-Pinout600Ă—600 28.6 KB

Here is the datasheet for MPS20N0040D

And a sketch...

1 Like
3

Can I get the blood pressure from there?

4

No that is just a pressure “transducer” .
You need to amplify it , calibrate and also know when the pulse starts and stops.
In the video he connects to the I2C bus , so you need to sort that side out .

5

There is no eeprom on the side of the PCB that you showed us.

Maybe it's on the other side.

6

photo_6131879381086352053_y
photo_6131879381086352053_y721Ă—1280 137 KB

This is the other side of the board.

7

Think you are out of luck there too...doesn't appear to be any i2C ...most of the uC lead to the lcd display..... are you sure it's the same model..?
Looks completely different to me.

8

We can't see any i2C also. the exterior looks very similar that is why I assumed it was the same model. Is there any other way I can get data from the board?

9

The board patent is registered, somewhere, using some of the silkscreen numbers. (the numbers should have part number, version, serial number and build date)

10

U5 COULD be a 1-WIRE EPROM!

11

can you circle where I should tap in the board for U5?

12

No. You need to find the make and model of the chip, or work out the pinout from the PCB. I'm too busy to do this for you at the moment.

13

itsken,

Tell us what the writing on U5 says, so that we can identify it.
It might only be a 3 digit code.

I had thought it was a voltage regulator as it has connections to the +V- pins, but I am open to persuasion.

R21 could be a pullup resistor (R20 too).

14

looking at track dimensions i'd say not

15

Good day, were you able to get the data from the board? We also have the same problem and model as yours and we also dont know the solution.

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