Why is the output of [ACS712]( link url) current measurement module unchanged? I connected 5.0V to VCC, and the output is always 2.56V. After connecting the current of 2-5A in series, the output has not changed. I use an AC power supply, and I directly use an AC voltage regulator to connect the thermal, serial current. Does anyone know the reason?

Hello! I bought atmega328p and atmega32u4. And now I want to program the [atmega32u4]( link url) with arduino. Are the the atmega series programmed with the same software? Are the programming principles the same?