Arduino Nano Every i2C problem (Please)

Official Hardware Nano Family Nano Every
1

Hi
I meet a question for a long time.
Actually I use max 30102 with Arduino UNO and Nano every. When I used 30102 with UNO, it's perfect. No problem. After that, I replaced UNO with Nano every. I gained nothing in series port when I used Nano every (but max 30102 is lighted).
Actually, i have more than one Nano every mcu and more than one max 30102 chips. I tried handreds of times but gained the same results.

Also i tried to use two 4.7k to pull up the SDA& SCL in Nano every. Still fail.....

Also i use Scanner to test whether the IP esist. The adress can be found which is 0×57！
voltage：3.3v or 5v （i tried both)
SDA--A4
SCL--A5
gnd_gnd

Could anyone have experience in using Nano every? I google a lot but gain nothing. Thank you sooo much,

2

That means that communication is happening!

What results? You never actually state what the problem is.

How long are the wires? I2C was originally designed for on board communications no longer than 30cm. Although it's possible to make it work at somewhat longer distances.

3

@Hutkikz Yes, the communication is happening.

When i use UNO, the results in series port is shown as follow:
image

But i use Nano every, only "initializing......" other infor.

4

It sounds like you are having difficulty communicating with the Max30102 sensor when using an Arduino Nano Every, but it works fine when using an Arduino UNO. There could be several reasons for this issue, including differences in the I2C bus implementation between the two Arduino boards, electrical interference, or a hardware issue with one of the boards or sensors.

Here are a few things you could try to troubleshoot the issue:

  1. Check the wiring: Make sure that the wiring between the Max30102 and the Nano Every is correct and that there are no loose connections or bad solder joints.
  2. Verify the I2C bus frequency: Verify that the I2C bus frequency is the same on both the Nano Every and the Max30102. You may need to adjust the I2C bus frequency using the Wire.setClock() function.
  3. Check for electrical interference: Electrical interference can cause communication issues between the Nano Every and the Max30102. Try moving the sensor away from any sources of electromagnetic interference, such as power supplies or motors.
  4. Use a logic analyzer: A logic analyzer can help you diagnose communication issues between the Nano Every and the Max30102 by capturing and analyzing the I2C signals. You can use a software-based logic analyzer like Saleae or a hardware-based one like the Bus Pirate.
  5. Try a different Nano Every or Max30102 sensor: If none of the above solutions work, try using a different Nano Every board or Max30102 sensor to see if the issue is related to a hardware problem.

I hope these suggestions help you resolve the issue. Good luck with your project!

5

In additrion to @zombie143 's suggestions:

use twisted pair wires. shielded also even better. Think cat5 cable
pairs should be
SDA+ground
SCL +ground
ground should only be connected at one end.

Pullup Resistor- try a ~3.3k resistor

A capacitor close to the Max30102 ~10nF should do

You didn't say how long???

6

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