How to connect an external sensor?

Hi, I am working with a mangOH Yellow.
How does one connect an external sensor?

Thank you

  • Oline

What sensor are you talking about?
Do you want to connect to iot expander slot?

Connecting to the IOT expansion card, would be really nice. But I am very new to this, so I have no idea how. I am working with a frequens / PWM water flow sensor.
What would I need to connect this?

What pins are needed on this sensor?
Uart? spi?

Thank you for your quick response. It is ADC. :slight_smile:

You can check the schematic of iot expansion card here: