MAX30105 + Arduino Pro Micro?

[DonguiLLaume]

I’m trying to use this sensor together with an arduino pro micro. However, arduino pro micro has not neither SCL and SDA nor A4 and A5. Can I change something in the code to make the connexions to A2 and A3 instead? I am unable to find where to set this information. Thanks.

[nseidle]

Yup. You can setup a second wire port on the Pro Micro and then pass that stream into the library. I did something like this on my APRS entry. Checkout this code to see how to init a 2nd port on the Pro Micro. Then call something like:

myMax30105.begin(testI2C, 100000, 0x57);

This will init the MAX30105 using the testI2C i2c port, at 100kHz, using the I2C address of 0x57. See this line to see what I'm talking about.

[nseidle]

Also, see the SERCOM – Configurable Serial Ports section of the SAMD21 hookup guide.