Powerboost 1000C Low battery LED Circuit?
Moderators: adafruit_support_bill, adafruit
Forum rules
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/
- gamepi
- Posts: 17
- Joined: Sun Jan 08, 2017 8:17 pm
Powerboost 1000C Low battery LED Circuit?
On the powerboost, there is a LBO output. What components would I need to light a little red led when the battery goes low? The internal one is too small to rewire.
- adafruit_support_mike
- Posts: 67485
- Joined: Thu Feb 11, 2010 2:51 pm
Re: Powerboost 1000C Low battery LED Circuit?
The LED is controlled by the LBO pin broken out to the edge of the PCB. When the battery goes low, so does the pin.
The pin can only sink about 100uA of current, which is too low to light an LED directly. You'll need a PNP transistor like so:
The pin can only sink about 100uA of current, which is too low to light an LED directly. You'll need a PNP transistor like so:
Forum rules
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/
Talk about Adafruit Raspberry Pi® accessories! Please do not ask for Linux support, this is for Adafruit products only! For Raspberry Pi help please visit: http://www.raspberrypi.org/phpBB3/