LiPo charge controller board with power on and power off features?

C

colorado_hick

Well-known member
Howdy,
Curious if someone could point me at a board that would
1) Charge a LiPo battery from a USB connection
2) Transform output voltage to Teensy range
3) Take a signal over a digital out pin that would shut down the arduino so I could program for an auto turn off
4) Have a switch connection that immediately turns the unit off
4) Have a switch connection that immediately turns the unit on

I know there is a way to the off and on with MOSFTETs, hoping to avoid that if I can...
 
@colorado_hick: I have made use of the <Adafruit PowerBoost 1000> in several of my projects & find that it does a very good job. I can run these projects on LiPo battery power, or I can run them from external USB power. The PowerBoost 1000 will automatically switch between the two, & pass on whichever supply is greater, with no dropouts in the change-over. It also takes care of charging/managing the battery & does a good job of providing stable power in either case. One thing to note: The LBO (low battery out) signal is a 5VDC level, so you'll need to do something to drop that down to the 3.3VDC level that the current T4.x family requires/tolerates (I use a 2-transistor non-inverting level shifter circuit, but a single transistor with appropriate connections & components would work just fine, inverting the signal sense).

Good luck & have fun !!

Mark J Culross
KD5RXT
 
Thanks @kd5rxt-mark , that is one I was looking at.
On the tech spec it says "The converter can be disabled to minimize battery drain," what does that mean? Can I do that disconnection from my teensy? How do I reconnect it?
 
The Adafruit PowerBoost 1000 includes an active-low enable (EN) signal. That signal probably cannot be driven directly from the Teensy, primarily because it is pulled up to 5VDC, so without very careful usage, that could very easily be fatal to the T4.x. You may be able to design some external circuitry that removes/alleviates this danger & provides the functionality that you're after (which you stated that you'd like to avoid), but the EN signal is really designed to have a physical switch connected to it. When the switch is closed (connecting EN to ground) the module is "on", when the switch is open (allowing the EN signal to float up), the module is "off".

Hope that helps . . .

Mark J Culross
KD5RXT
 
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