I am starting with a new project. Charge controller for solarpanel. I use an ESP32 with a Ili9488, so far working, but I want to use Martin´s (medelc)
nice component for measurering the Amp when charging. The ACS712 is supplyed with 5V and the analog input to ESP32 is max 3,3V
Is it possible to set some parameters for the ACS712 Vref. ect so I can use this component or/and do I need some extra calculation, any advice please .
Hi Jorgen.
Since the ACS712 is connected to a 5v supply, then set up the properties as though it's connected to a 5V suppy.
The ESP32 ADC will need to have a max of 3.2v
What you will need to do is connect the output of the ACS712 to a 10K resistor the other end of the 10K resistor connect to the ADC i/p.
Then connect the ADC i/p to GND via an 18K resistor.
Some progress. As you say, I add a resistor 10k to the output of the ACs712 > analog input on ESP32 from there 18k > ground.
I read now without load on the ACS712 -3.7 is it possible to use some of the setting in the proporties for the ACS712 component for alignment?
I try some diffrent but no good luck. I also try to use potmeter 50k instead of resistors it is possible to get 0.0A but then it is not liniar when I increase the amp´s.
.