*Trinket+two/three buttons+bluetooth module+24RGB_ring. My only concern now is what is the difference between those options to power my project. That is essentially what I want to do with the PowerBoost. That way you can shut it off when the project is supposed to be off, reconnect for power or to allow it to be charged through the micro-usb.
Yup, the LiPo backpack can be embedded with a switch for the battery. Carefully cut the trace between them with a hobby knife and replace with two wires from a switch like this slide switch, or this pushbutton one, for example. The two 0.1" holes with a box around them are the battery output line. If you want to add an On/Off switch, we also made that really easy. I now will change the setup and use a 3V Pro Trinket instead, w/LiPoly backpack and 3.7V LiPoly battery attached, and a step-up regulator (3-5V) as well as a logic level shifter to get the 5V devices running. Good that I asked before building the solution. When you disconnect 5v, the boost circuit gets power from the battery. When you connect 5v from a wall supply, the LiPo charger drops the voltage to match the LiPo, but provides most of the current that goes to the boost circuit. That has a built-in LiPo charger connected upstream from the boost circuit. You'd be better off using a PowerBoost 500C. You lose 20% of the power through the PowerBoost, so the battery will basically drain itself. Is that correct?Īdafruit_support_mike wrote:You have a power loop.Ĭurrent from the LiPo will go through the PowerBoost, get boosted to 5v, go into the Pro Trinket to the LiPo Backpack, then back through the LiPo charger to the battery. Can you confirm that this setup will work and will not break the components?Īdditional question: if the LiPoly Backpack power switch is used, it will only turn on/off the Pro Trinket when not plugged into USB, or? My understanding (even with the standard use of the LiPoly backpack) is, that as soon as USB is plugged in, the Pro Trinket will switch to use the USB power, and it does not matter, whether the switch is on or off. So the Pro Trinket should run with power around 5V in both cases, with USB plugged in or with LiPoly battery used. Power Boost output 5V and GND -> input to Pro Trinket BAT+ and GND LiPoly Backpack output BAT and GND -> input to Power Boost BAT and GND This is needed to charge the battery when the Pro Trinket is plugged to USB. Battery connected to LiPoly Backpack, Pro Trinket BUS -> LiPoly Backpack 5V, also GND. provide 5V (and not only 3.7V of the LiPoly battery) to the Pro Trinket
Also, the box is already done, and I'm going to use the USB port of the Pro Trinket and cannot change to a separate USB socket. I need to work with ~5V in this project, because some of the devices I'm going to attach don't work with 3.3V.
Adafruit PowerBoost 500 Basic (or similar step-up regulator) ( ) Adafruit Pro Trinket LiIon/LiPoly Backpack Add-On ( )
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