search

universam1 / iSpindel

electronic Hydrometer
http://www.ispindel.de
Other
827 stars 322 forks source link

Showing to much voltage? #430

Closed Brewmaster-gr closed 3 years ago

Brewmaster-gr commented 4 years ago

Hello today I have build my ispindel according to the instructions. I used the 1st variant( I made my own circuit board etc.) I used 220k resistors, 470ohm and a 4k7 ohm as instructed. Everything is working fine except for some reason the voltage of the battery is showing 5.34 volt but is 3.56 when measured with a multimeter. I can't adjust with the correction factor as it is more than 20%. What did I do wrong? Thanks.

ErikdBr commented 4 years ago

I don't know if it has to do with your problem but the resistor 470Ω has been replaced by a 390Ω resistor or even better a BAT43 Schottkey diode, due to recovering from deep sleep issues.

Brewmaster-gr commented 4 years ago

Thanks for the reply I will try that, 390 or 330ohm resistor?

ErikdBr commented 4 years ago

330 I just read in the parts list.

Brewmaster-gr commented 4 years ago

Nope I just replaced it, same issue. Ahh never mind it must be something maybe with the battery or coding? Because when I take a measurement from the wemos it is the same as the battery voltage 3.55.

thegreatgunbantoad commented 4 years ago

Have you tried measuring the voltage after the pot down? There's a 100k/220k in the Wemos and the iSpindel adds 230k to the other 220k. So you should be seeing Vbat * 100/(100+220+230). Assuming your battery is around 4Vish (I know they claim to be 3V7 but that's not what I've seen them measure in at when fully charged) you should be getting about 0.72V.

stale[bot] commented 3 years ago

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.