Hello all,
This is my first post on this forum and my first time using a Teensy. I have been using Arduino Micro and Mega for a while now.
I am working on a hobby project which requires a battery powered controller. I have selected the Teensy 4.1 as the micro for it's serial ports and plenty of I/O pins.
I am planning to use the Adafruit Powerboost 1000C as the power source so that I can have a lipo battery powering the controller normally, and then plug in a USB cable for external power and to charge the Lipo.
All this works fine.
My question however, is that the Power Boost has a Low Battery Output (LBO) that gives a voltage out between 4.9V (When powererred from USB) and The lipo voltage when on internal battery only. This pin then drops to 0v when the lipo is low. I want to use this to indicate when the lipo is low.
I am planning to pass this LBO through a voltage divider and into one of the Teensy's analogue pins to ensure no more than 3v appears at the teensy.
The problem is that when the controller is powered off and no 5v is on the teensy, this 2-3v will still be on the analogue pin.
Does any one think this would cause a problem with the teensy back powering somehow?. I've seen this occur with a cheap Max7219 but the teensy is more expensive so do not want to risk damaging this device.
Thanks
Keith.
This is my first post on this forum and my first time using a Teensy. I have been using Arduino Micro and Mega for a while now.
I am working on a hobby project which requires a battery powered controller. I have selected the Teensy 4.1 as the micro for it's serial ports and plenty of I/O pins.
I am planning to use the Adafruit Powerboost 1000C as the power source so that I can have a lipo battery powering the controller normally, and then plug in a USB cable for external power and to charge the Lipo.
All this works fine.
My question however, is that the Power Boost has a Low Battery Output (LBO) that gives a voltage out between 4.9V (When powererred from USB) and The lipo voltage when on internal battery only. This pin then drops to 0v when the lipo is low. I want to use this to indicate when the lipo is low.
I am planning to pass this LBO through a voltage divider and into one of the Teensy's analogue pins to ensure no more than 3v appears at the teensy.
The problem is that when the controller is powered off and no 5v is on the teensy, this 2-3v will still be on the analogue pin.
Does any one think this would cause a problem with the teensy back powering somehow?. I've seen this occur with a cheap Max7219 but the teensy is more expensive so do not want to risk damaging this device.
Thanks
Keith.