only until the initialization can not be a failed or successful message

oxullo / Arduino-MAX30100

Arduino library for MAX30100, integrated oximeter and heart rate sensor

GNU General Public License v3.0

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only until the initialization can not be a failed or successful message #30

Closed dimanes closed 6 years ago

dimanes commented 6 years ago

Troubleshooting checklist

[yes] I read the README (on master) thoroughly
[yes] I ran the MAX30100_Tester and I'm going to paste the output down below
[yes] I filled in all the details of my setup down below

Description of the issue

i have a problem with my rcwl max30100, i have compiled according to wiring document. I use arduino uno, when I compile code test, minimal, and debug I only got intializing max30100 only. did not get a success or failed message. thanks maybe someone can help

Output from MAX30100_Tester example

Details of my setup

Arduino hardware: arduino uno
MAX30100 breakout: gnd - gnd 3.3v - vin int - d2 and 4.7k 3.3v rd and ird - 3.3v and gnd 0.1uF scl - a5 and 4.7k 3.3v sda - a4 and 4.7k 3.3v
Arduino framework version: 1.8.5
MAX30100 library version: new version

oxullo commented 6 years ago

@dimanes I added some notes to the readme file, in particular regarding setups like yours (chapter "Logic level compatibility"). Please have a look and get back here afterwards. https://github.com/oxullo/Arduino-MAX30100/blob/master/README.md

misan commented 6 years ago

Same here with an original Arduino UNO.

However, it does work on an Arduino MEGA.

I am using a MAX30100 module from eBay powered at 5V that includes a 1.8V regulator.

No external pull-up resistors used (though I read your instructions for using 4.7K). Because some other I2C modules worked flawlessly without adding them, many people are going to assume this one should too :-(

oxullo commented 6 years ago

@misan when the breakouts include the pullups like the one you posted, there's no need for additional care, but as I see the three pullups are connected to the 1.8V rail instead of the 3.3V. And even if it was connected to the 3.3V there would had been no certainty that it was going to work with a 5V MCU (logic level thresholds for cmos..). So (@dimanes you too if it happens to have the same breakout) try to desolder the three pullups and add external pullups to the Vcc of the MCU. Consider that SCL, SDA, /INT of the MAX30100 safely handle up to 6V (page 2 of the datasheet).

oxullo commented 6 years ago

Closing the issue due to inactivity