im going to attempt to use the PCF8591 for monitoring a float sensor circuit. when the float sensor is closed it will pull an analog pin on the PCF8591 LOW. I did not see any mention of built in pullups in the data sheet. I wouldn't want a floating signal bouncing everywhere when the float sensor …

Ok, but it seems a waste to use that chip. Perhaps if you share more details of your project we can suggest ways to save pins so that you will not need the PCF8591. You can use any value resistor you like, there is no danger of frying the chip as long as you do not connect the resistor to a higher …

Pull-ups Or NO? PCF8591

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PaulRB February 23, 2022, 7:42am 2

Can you post a link to details of the float sensor? It sounds like you are connecting a digital sensor to an analog input. Why is that?

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Pull-ups Or NO? PCF8591

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