Why is the output of ACS712 current measurement module unchanged?

[Tessie T]

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?

[skywatch]

I think you need to post a clear drawing or photos of the setup and the code you are using.

I donlt know what you mean by "connecting the current in series" nor what "AC regulator" you are using or what "thermal serial currenr" is.