I have two stm32 boards STM32F103ZE and STM32F103RC I am trying to use an ultrasonic sensor in a project, the code works on the STM32F103RC board and but doesn't work on the other, I changed configuration and pins but still nothing, what could cause

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Are we just guessing?

A bug in the code.

A hardware error.

A bad/counterfeit chip.

A more objective approach would be to look at what is "not working", determine why, and fix it.

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Inability to communicate salient information?

Changed what to what? Assume forum members lack psychic skills.

Board level design differences? I2C? Pull-ups?

Pins involved?

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