Zero Output at MAX30100_RawData and MAX30100_Minimal about arduino-max30100 HOT 15 CLOSED

First thing that comes in my mind: check if the I2C voltage shifter is able to work at 400kHz

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Oh OK, it make sense. I have to find my shifter datasheet. But may I know where was the 400kHz came from?

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MAX30100 can operate in full speed mode hence the library initializes I2C in full speed.

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the same problem

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And I lower the i2c speed

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How fast is your I2C speed now @liviuanc ?

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@nazmibojan have you had any success by lowering the clock speed?

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@oxullo No. I still had the same problem.

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@nazmibojan does the sensor shine red during the test run? is the arduino you have a genuine one? have you tried with a 3.3V microcontroller?
My baseline test setup is very similar to yours and it works, but an alternative that I'm testing right now is to pull up SDA and SCL to 5V. It works so far but since it worked also with 3.3V I can't properly compare.

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Hi,@oxullo I am using Nano and MAX30100 sensor and their connection is -pullup SDA and SCL with 4.7k ohm to the 5V. There after he got working but HB, Spo2 and temp show zero.Also the RED led does not light up normally ,it does when connected with GND alone (not with IR LED).
After uploading all thing is correct but values gives zero.
And what should I have the I2C_BUS_SPEED (400000UL).
What i do to avoid it?

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@AhmadZMQ please open a new issue and make sure you fill in the details requested in the issue template

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Hi @oxullo , my MAX30100 doesn't shine red during the test. Why did it happen?
I don't know about genuineness of my Arduino, it's a gift from my friend years ago. I have been tried using STM32F1 development board, it shows the right temperature but I don't continue this project because there is another important business that i must finished.

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@nazmibojan whenever you want to get back on track on this project, please open a new ticket and provide a sketch of how you connected. Your issue is similar to the one @AhmadZMQ is experiencing, so eventually follow #33 beforehand.

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Finally, I just found the problem of my MAX30100 module. Actually, I feel strange when I look back to my MAX30100 price. That's too cheap in my country than amazon or another online store outside Indonesia. I found Pin 1 (Vout) of 3.3V regulator didn't connect to Pin 2 (Vin) of 1.8V regulator. A Via that connects that two pin didn't has a hole (that means a via didn't success to be created between top and bottom layer). Oh God, that's very bad product. Below I attached my result for MAX30100_Tester.
Thank's all.

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hi @oxullo can you give me the wiring of max30100 to arduino uno my MAX30100 doesn't shine red during the test i connect the VIN to V5 SCL to SCL SDA to SDA and TIN to D2 and GND to GND . should i use resistor ? please help me .

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