Output all zeros

[ghost]

Hello,

Firstly, thank you for taking the time to document your procedure. It has helped me tremendously in getting started with my project.

I have connected my MAX30205 sensor (as shown in picture attached) and uploaded your script to the arduino, however, the output in the serial terminal window is showing nothing but a stream of 0.00'C values. In the code, I made sure to change the i2c address to match the one of my device, however, I can't seem to think of what I could have done wrong. Do you have any insight into what might cause this issue?

Thank you very much!

[VenkateshBhat]

Thank you for kind words,
could you please share the schematic of the board you are using?

[ghost]

Surely. I've attached the schematic and data sheet for the MAX30205 temp sensor and provided a link to the Arduino Uno R3 board.

Thank you for the quick response!

max30205-human-body-temperature-datasheet.pdf
MIKROE-2554_Web.pdf
https://store.arduino.cc/arduino-uno-rev3

[VenkateshBhat]

@KaciMadden Thank you,
The example sketch has to run directly without any changes. Do test once with same slave address provided in the example sketch.

[ghost]

Okay. I re-downloaded your files and ran them untouched. I'm still getting the same stream of 0.00'c values, however,.

[VenkateshBhat]

The recommended supply for the MAX30205 is 2.7V to 3.3V ,what I can see from the schematic is(https://download.mikroe.com/documents/add-on-boards/click/fever/fever-click-schematic-v100.pdf) it does not include the level translator which could have damaged the chip . You need to have a translator in between SCL and SDA.

[mrodas19]

you just gotta connect well GROUND

[nithin-uppalapati]

What do you mean by ‘translator’ between SDA and SCL...?

Thanks.

[overclock98]

@KaciMadden @nithin-uppalapati Did you solve the issue?

[bobonov]

What do you mean by ‘translator’ between SDA and SCL...?

Thanks.

I guess he mean a pull up resistor.

According to i2c specification SDA and SCL line are opendrain , devices can take the level to 0V, but you need a pull-up resistor to obtain the high level.
You simply need need a resitor between 4.7 kΩ and 10 kΩ that connect the alimentation with the line, one for SDL and one for SCL