Output all zeros

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?

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.

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