I just had an idea (and I'm certain its not a new one):
Create a charging circuit for a Ti 84+ calculator.
It takes 6 volts from the batteries if I'm correct, which (I think) won't take too much crazy circuitry from a 5 to 6 volt step-up thing (or even a 12 to 6 volt divider).
I know I could just use rechargeable AAA batteries, but I'm an on-the-go guy. I want to be able to just plug the calculator in and never worry about low batteries during long OS transfers, frequent file download/uploads, or testing wifi shields
So here's my proposal:
Direction #1
*Use rechargeable Ni AAA batteries in place of the regular AAA batteries. These will then be charged via the USB OTG port
*These batteries would be charged by a seperate port added on, perhaps a DC power jack or other USB port
Direction #2
*Take out the existing 1.5V x 4 cell housing and replace with either a straight 3.7V LiPo battery and then add in the circuitry myself OR
*Take out the existing 1.5V x 4 cell housing and replace with an off-the-shelf 6 volt LiPo battery, possibly with included charging capabilities.
I have access to an excess of 3.7V LiPo chargers that take an input of 5V via a mini USB cable. I don't know if these circuits can simultaneously charge/discharge.
What should I do? I can always go on craigslist to find really cheap working ti 84+'s, so that isn't too much of a concern.
Thoughts on the way forward?
*EDIT*
Is there an exact 6V tolerance? Is it stepped down from 6V to 5V logic? Is it split to 3.3V logic? Can I get away with using a 5V battery?
Create a charging circuit for a Ti 84+ calculator.
It takes 6 volts from the batteries if I'm correct, which (I think) won't take too much crazy circuitry from a 5 to 6 volt step-up thing (or even a 12 to 6 volt divider).
I know I could just use rechargeable AAA batteries, but I'm an on-the-go guy. I want to be able to just plug the calculator in and never worry about low batteries during long OS transfers, frequent file download/uploads, or testing wifi shields
So here's my proposal:
Direction #1
*Use rechargeable Ni AAA batteries in place of the regular AAA batteries. These will then be charged via the USB OTG port
*These batteries would be charged by a seperate port added on, perhaps a DC power jack or other USB port
Direction #2
*Take out the existing 1.5V x 4 cell housing and replace with either a straight 3.7V LiPo battery and then add in the circuitry myself OR
*Take out the existing 1.5V x 4 cell housing and replace with an off-the-shelf 6 volt LiPo battery, possibly with included charging capabilities.
I have access to an excess of 3.7V LiPo chargers that take an input of 5V via a mini USB cable. I don't know if these circuits can simultaneously charge/discharge.
What should I do? I can always go on craigslist to find really cheap working ti 84+'s, so that isn't too much of a concern.
Thoughts on the way forward?
*EDIT*
Is there an exact 6V tolerance? Is it stepped down from 6V to 5V logic? Is it split to 3.3V logic? Can I get away with using a 5V battery?
