I have a new project I want to start on.
A high powered LED based strobe.
Will consist of 8 or so XR-Es mounted on a square core inside a acrylic tube. ( much like my video light). The LED's would fire in pairs for a short bust, probably between 1/10- 1/100th of a second then wait for 1/4 -1/2 second before firing the next pair.
The LED's would be over driven by 50-100% using AMC 7135's and powered off a single 18650 or 22650 cell. A capacitor could be added to help smooth the power delivery since a 18650 may suffer at 4 amp even for just 1/10th of a second (???).
If there is anyone out there that wants to help out by programming a PIC for me I would appreciate it. It should be pretty simple requiring 4 outputs from the PIC that pulse. I would like to be able to adjust the timing in some way to get the most out of it.
Now what would be cool is a battery monitoring feature that let you know of the voltage when you turn it on and as it runs down the pulses become shorter and spaced further apart.
This of course complicates the source code some what and would require the use of a ADC.
Im not really sure what length of pulse would be too short but the shorter it is the longer the battery life as well as the ability for the battery/ capacitor to deliver the charge and perhaps the better for over driving the LED's.
Now some quick calculations......
If I drive 2 LEDs at 4 amp for 1/10 of a second twice a second off a 4000ma 22650 cell it will run for 5 hours. Drop it back to 1/100th every second and its 100 hours.