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I'm trying to connect my floor heating thermistor (NTC) to ESP8266 (at Wemos D1 mini board). But I'm unable to get good results.

I get an approximation formula from this table (after I input my values in). calculation table

But I get 41°C (should be around 24) what is really not even close. So what could be bad?

My candidates for bug are:

  1. I use 230k Ohm at 25°C in the table to calculate formula (10k thermistor+220k voltage divider)
  2. I use 3.3V as the supply for NTC but wemos D1 A0 is maxed 3.2V (but how to fix it?)

enter image description here

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Ok, the solution is quite simple (in my first schema I forget to add a resistor between A0 and GND) but I decided to replace 10k resistor with 20k trim pot so I can adjust to exact value). I hope this will help someone.

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