M5stack voltmeter

[wizpic]

Just a quick question it says that the m5stack voltmeter can measure up to +/-36v

I was just wondering would it be possible to modify it so that it can measure +/-99v absolute voltage ?
Here is the unit I’m talking about and schematic

https://thepihut.com/products/voltm...DsY-WmK3wBwx6ZPV-xsVZqoaTx7aTAXhoC0uYQAvD_BwE

 

[KlausST]

Hi,

If I see it correctly then 11k + 360k = 371k are for 36V.
This is 371k/36V = 10.3056k per V

so you need 10.3056k/V * 99V = 1020.25k in total

you already have 371, so you need to add (102.25k - 371k) = 649.25k externally (serially)

Klaus

 

[FvM]

11k + 680k in the original instrument.

 

[KlausST]

11k + 680k in the original instrument.

Thanks, You are right.

Not my day :-(
so it is a good exercise for the OP... to make it better than me.

Klaus

 

[wizpic]

Thanks guys that’s give me the explanation I required and makes it easier