What is the proper length of a I2C flat cable of a temperature sensor probe?

Dear Digital Technology Experts,

I am planning to build a temperature monitor based on a I2C sensor probing hard-to-reach area such as refrigerator interior, ocean terminal container interior, etc.

Then, I have found this cheap China sensor.

Now my question is:

What is the possible maximum length of the probe's flat cable so that I2C data transmission between this temperature probe and the MCU is still kept intact?

Those 4 cables are:

I2C Clock
I2C Data
Voltage input
Ground

Thanks for joining this discussion.

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0 dougw 1 month ago

As Jan indicates, 2 meters should be fine at low speed. If you need to go further check back here for more advice. If 2 meters isn't quite working try with stronger pull-up resistors.

Note HDMI cables have I2C in the cable, so those lengths can work.
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0 HKPhysicist 1 month ago in reply to dougw

I will start to try 1 metre. This length is good enough to probe most refrigerators from outside their cases.
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0 HKPhysicist 1 month ago in reply to dougw

I will start to try 1 metre. This length is good enough to probe most refrigerators from outside their cases.
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