Stable voltage reference for Arduino Nano

hi guys,
i'm building small project arduino nano. i'm using analogread() , analogwrite() alter signal my.

so far good, circuit working fine, caps , resitors ok seems have problem reference voltage

i've tried using 7805 or 78l05 reference voltage still jumps 4.98v 5.02 . in case problem because 0.1 volts can cause engine stop.

it seems internal reference voltage in arduino not 5.00 4.80-4.96...
in case not working since on 2 different arduinos internal reference different.


i found function measure internal 1.1 reference voltage , calculate vin (vin should work me)
https://github.com/cano64/arduinosystemstatus

well if change vcc voltage 4.6 5.12 example internal 1.1 changes . in end analogread , analogwrite not in specifications .

so want read sensor 0 4.7 volts high precision . adc 10bits fine me , reference volgate still bothers me. don't want use batteries .


any ideas ?
maybe external voltage reference or should tinker 1.1 volt internal reference ?

hi, , welcome forum.

quote from: mtrx on jan 03, 2017, 11:57 pm

hi guys,
i'm building small project arduino nano. i'm using analogread() , analogwrite() alter signal my.

from what?

to measure voltage, calculate voltage divider output ~1volt max.
then measure 1.1volt aref enabled.

post code (with code tags) if want that.
leo..

Arduino Forum > Using Arduino > Project Guidance > Stable voltage reference for Arduino Nano

arduino