Multiple sensors with NodeMCU ESP8266

[panoss]

I 've built this example and works fine.
Now I want to have multiple sensors (I use NTC thermistors as sensors) and so I 've built this, but I must modify the software.

The difference between these 2 circuits is:
In the first example, the thermistor is the bottom resistor of the voltage divider.
In the second example, the thermistor is the top resistor of the voltage divider.

The part of the code that I have to modify is:

Code: [Select]

         float logR = log( 10000 * ( 1024 / readValue - 1 ));                 // Separate the calculation for simplicity and debugging
       
        celsiusTemperature = 1 / ( aConst + bConst * logR + cConst * pow(logR,3) ) - 273.15;   // Calculate the temperature in Celsius
        fahrenheitTemperature = celsiusTemperature * 9 / 5 + 32;

Any help is welcome.

[panoss]

I found that ESP8266 's analog input senses from 0 to 1 Volt.
So if I have a voltage drop of 0.65Volts over the diode, then the reading from the ADC is very faulty!
Is my thought correct?

Question #2: the example (1st link) as I already said, works fine (I built it), even though the voltage divider outputs 0-3.3V (to ADC input). And the ADC can 'sense' voltage from 0-1V and not 0-3.3V...How is it possible to be working correctly? Shouldn't it malfunction?