shared ground

Is it safe using the same ground GND for the power supply of the WC32 and the PWM output signal? I do want to save in wires...

That depends on your PWM driver. Sharing ground will have slight voltage drop, if your PWM output board could tolerate that.

CAI_Support said:

That depends on your PWM driver. Sharing ground will have slight voltage drop, if your PWM output board could tolerate that.

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Thanks- I have not tested with PWM, but the shared GND with analog IN. With the BRE module, measurements using an acceleration sensor were ok  using the  GND and +5V from the AUX connector powering the sensor, but with the WC32 everything was zero, is there something different?
I did not find the information how much the +5V on the AUX connector may sink or what power source best for the sensor.

If it shared with analog ground, it could impact the accuracy of analog reading

Interresting, so you mean that sharing gnd is not a good practice? If im right, we should use ground separatly?

With analog input so sensitive, it is best to have separate analog ground, so that digital DC voltage drop not make any impact on it.

CAI_Support said:

With analog input so sensitive, it is best to have separate analog ground, so that digital DC voltage drop not make any impact on it.

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a lot of the sensor boards do not offere separate ground. and plugging them to a different voltage converter will certainly not improve the situation.
May be the tendency towards i2c is explained this way. not that much fuzzing around with additional capacitors...