Are you powering the ACS712 from the 5volt pin of the Arduino?
Which Arduino.
3.98volt out makes me think you're using a 3.3volt Arduino (with 3.3volt default Aref).
Your German post mentions an ESP8266.
Leo..
Are you powering the ACS712 from the 5volt pin of the Arduino?
Which Arduino.
3.98volt out makes me think you're using a 3.3volt Arduino (with 3.3volt default Aref).
Your German post mentions an ESP8266.
Leo..