PowerBoost 1000 low battery pin problems

General project help for Adafruit customers

Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.
Locked
User avatar
Grimm
 
Posts: 6
Joined: Wed Jan 14, 2015 4:58 am

PowerBoost 1000 low battery pin problems

Post by Grimm »

I want to read the low battery pin on the PowerBoost 1000 and read it with a Propeller MCU. The problem is that the voltage on that pin is pulled high to BAT which can be as high as 4.2v, much too high for the Propeller. So I put a 100K Ohm resistor in series so the voltage would be lower. The problem is that with a charged battery the pin is reading all over the place. It's not staying a steady 1, but randomly jumps between 1 and 0. Is my resistor the wrong size so it's lowering the voltage too much? Should the pin be pulled high as well? Thanks,

Jason

User avatar
adafruit_support_mike
 
Posts: 67446
Joined: Thu Feb 11, 2010 2:51 pm

Re: PowerBoost 1000 low battery pin problems

Post by adafruit_support_mike »

A 100k resistor won't lower the voltage by itself. You'd need another one between the pin and GND to make a voltage divider.

Locked
Please be positive and constructive with your questions and comments.

Return to “General Project help”