bikeNomad
Newly Enlightened
This LED stuff is fun, eh?
Flush with success after my recent Coleman 2-AA LS mod (which used my constant-current LT1308B regulator), I started to think about how I'd improve it. Some things came to mind: <UL TYPE=SQUARE><LI> improve its efficiency
<LI> make it not destroy rechargeable batteries if left on for a long time
<LI> automatically switch to "moon mode" if the voltage gets somewhat low to extend runtime
[/list]
And then I realized that there was a simple, fun solution: use a microcontroller!
I found an AVR microcontroller called the ATtiny15L that runs from 2.7 to 5.5V and has everything I need to make a nice constant-current step-up circuit (a step-down one will follow).
Look at the schematic and board for more details.
Note that because of the input voltage requirements, this is aimed more at running 2 or 3 LS from 3 cells. The step-down one will deal with the 3 or 4 cells to 1 LS.
Is anyone interested in using such a beast? What would your requirements be?
Would anyone like to buy such a thing?
Flush with success after my recent Coleman 2-AA LS mod (which used my constant-current LT1308B regulator), I started to think about how I'd improve it. Some things came to mind: <UL TYPE=SQUARE><LI> improve its efficiency
<LI> make it not destroy rechargeable batteries if left on for a long time
<LI> automatically switch to "moon mode" if the voltage gets somewhat low to extend runtime
[/list]
And then I realized that there was a simple, fun solution: use a microcontroller!
I found an AVR microcontroller called the ATtiny15L that runs from 2.7 to 5.5V and has everything I need to make a nice constant-current step-up circuit (a step-down one will follow).
Look at the schematic and board for more details.
Note that because of the input voltage requirements, this is aimed more at running 2 or 3 LS from 3 cells. The step-down one will deal with the 3 or 4 cells to 1 LS.
Is anyone interested in using such a beast? What would your requirements be?
Would anyone like to buy such a thing?