I have a circuit that will use a 3.3v ProMicro and will run off of a 3.3v lipo battery.
It needs to be wireless so I thought of using the Bluetooth and Lipo add-on for makey makey (WRL-11378).
It has Bluetooth a 3.3V lipo battery charger and says it can work on arduinos other than makey makey.
My question has to do with using 3.3v since the makey makey is 5v…
The pins in the BT module have a VCC that goes to the 5V pin on the makey makey. I believe this is how it senses when the USB is plugged in so that it switches off the battery output and switches ON the charging circuitry.
My ProMicro is 3.3v so just need to be sure that it will still work correctly for both BT transmission and battery charging…
3.3v is probably a Li-Fe (lithium Iron Ion) cell, not a Li-Po (they are 3.7v)
The nominal charging rate for LiFE and LiPo both are right near 5v anyway, but still regulated of course for safety…
If what you are asking is along the lines of- can you run the MC (5v req) from a 3.3v battery? the answer is yes, but your endurance times will be much shorter.
Can you refine the question, my whiteboy hillbilly intellect gets confused sometimes if not contemplating questions asked by Leonard Nemoy or Isaac Asimov… :lol:
I basically have a promicro receiving sensor data.
The data is gathered and streamed to a pc wirelessly through the makey Bluetooth module.
I chose the makey because the device has to be self contained so I figured the BT adapter can double as my battery charger.
From what I understand the makey BT device can charge a 3.7 v lipo but will only do it when it senses that the promicro is plugged Into a USB port. If the USB puts out 5v I am thinking this might be good for charging… Does this set up make sense?
Is the makey BT adaptor suitable for this set up???