Home Automation V4 8-Layer Stackable HAT for Raspberry Pi Analog Inputs pull-up resistors


New member
I am using this HAT along with a Raspberry PI 5. It works smooth.
My issue comes with the analog inputs. The HAT analog inputs are "pulled up" to 3.3V through 15K resistors (see attached image).
Those resistors alters my analog signal circuitry, adding a DC voltage that I don't need or require.
Is there a way that the HAT provide analog inputs without that pullup?
Any suggestions will be welcomed.
Thank you!


  • Analog_HAT_Analog_Inputs_pullups.png
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Staff member
The card was designed for 10k thermistors. You can remove the resistors from the pcb. if you have the right tools I can send you a picture marking the one must be removed.
What type of sensor do you measure so the 15K pull-up modify the value?


New member
Alex, thanks.
Please send the pictures.
I am using an AC Voltage sensor, with provides me ~ 3 Vpp AC output at 120VAC input. Then I rectify to obtain a DC level proportional to the input. My circuit output impedance is not low enough to pull down the 15k resistors.
I hope this helps.
Thank you