External sensor NTC

[proddy]

Got a question via the web form:

Hi, i want to include an Buderus NTC Sensor additionally. Setting the GPIO was OK, but how can I include the calculation from ADC to temperature values (NTC is non linear).

[MichaelDvP]

Using a dallas is much easier. For NTC he need a const current source or a fixed reference resistor.

• Measure the adc
• create a custom ram val for the temperature
• create a scheduler on change of adc and calculate the temperature as command for the custom value. We have shortly implemented the log function (natural log) he needs.