Hi
I have a board connected to 2 batteries (Mkrfox1200) . I have to make a analog reading on ex temp/weight cell. Does the analog reading value change due to a change in battery voltage?
Thanks in advance.
Hi
I have a board connected to 2 batteries (Mkrfox1200) . I have to make a analog reading on ex temp/weight cell. Does the analog reading value change due to a change in battery voltage?
Thanks in advance.
Hello there!
Yes the readings would change because as the battery voltage decreases, the analog reference voltage will also decrease, and result in different readings of the same voltage.
Sure does. I ran into that same thing not too long ago. Definitely use a regulator so that there is a stable comparison
Check the datasheet for the processor. There may be internal analog references that you can use. The internal references would be independent of battery voltage.
Hi there - thanx for input
How to use a regulator?
There are many kinds of regulators. Look up a 7805. Very common and easy to use. regulators for Arduino usually come in two values. 5vdc or 3.3vdc
Whether the analog reading changes with the battery value, also depends on the sensors used!
If the output is ratiometric, then the output changes with the battery voltage, and the ADC readings change with it as the battery voltage is the reference voltage.
If the output is absolute, then you have to use an absolute reference or indeed your readings will change with battery voltage.
For regulators, the 7805 does the job but there are much better regulators out there. Which one you need, and if you even need one, depends on the battery voltage.
wvmarle:
For regulators, the 7805 does the job but there are much better regulators out there. Which one you need, and if you even need one, depends on the battery voltage.
agreed, there are many types, it also depend on the wattage.
the only reason I said the 7805 is because he asked what a regulator did/was.
I assume that the OP isn't designing a complicated system based on that question. So I suggested the "easy" way.