Resolved! Many people have complained about noise on ADC inputs, maybe to do with impedance. Has this be rectified on any version or family of the STM32?
One user mentions noise from USBhttps://community.st.com/s/question/0D50X00009XkfMDSAZ/stm32f4-adc-noise-with-increased-activity-in-usb-fsOther comments:Keep the wiring short, and make sure the resistor value matches the ADC input impedance. I’ve suc...