Measuring problem with ACS712

Hello, I´m trying to measure the current from a LED strip with the sensor ACS712 ±5A. Also, I´m using a TIP120 to regulate the strip with a PWM. The problem is when I measure with the multimeter the lectures are 0 A and 0.34A with the minimun and maximun value of PWM, but with the sensor the lectures are 7.5 and 7.9 A respectively. Attached I send the circuit in a picture. I hope someone has some idea what is happening.

PD: I used the codes examples from internet, so I think the problem is not there.
Thanks!

Sin título.jpg

I just discovered the problem is the board arduino, because I changed the board and I put arduino UNO instead MKR WAN 1300 and it´s work, but the other codes I run in the MKR work, so I don´t know what is happening.

An ACS712 can't be used with a MKR WAN 1300 Arduino.
An ACS712 is a 5volt device (4.5volt minimum), and a MKR has a 3.3volt MCU.
Leo..