Hi
Being somebody new with hardware I have a question with a high resistance input.
I would read a fast (well... 0.7 second) NTC with a voltage divider, max. 10 times a second. The 3.3V would be driven by a digital out at least 100ms before measuring. The NTC has a resistance between 160kOhm and 10kOhm in the range that I would need it. Probably use a fixed 22kOhm as the second half of the divider.
If I read the info here correct I also need a capacitor of about 10nF between input and GND.
Is this a reasonable setup?
Would the cap also filter out power supply variation?
First tests will be with USB power afterwards with battery power.
NTC : http://www.produktinfo.conrad.com/d...188506-da-01-en-TEMPERATUR_SENSOR_NTC_833.pdf
Being somebody new with hardware I have a question with a high resistance input.
I would read a fast (well... 0.7 second) NTC with a voltage divider, max. 10 times a second. The 3.3V would be driven by a digital out at least 100ms before measuring. The NTC has a resistance between 160kOhm and 10kOhm in the range that I would need it. Probably use a fixed 22kOhm as the second half of the divider.
If I read the info here correct I also need a capacitor of about 10nF between input and GND.
Is this a reasonable setup?
Would the cap also filter out power supply variation?
First tests will be with USB power afterwards with battery power.
NTC : http://www.produktinfo.conrad.com/d...188506-da-01-en-TEMPERATUR_SENSOR_NTC_833.pdf