Hi,
after a long time of absence i started a little project. I got a used Sunwayman V10R and modified it to a tripple high cri:
- Driver modified to 2 ampere current (other current shunt, coil & ceramic condensator)
- brand new Tripple Osram Square high Cri 4000°k - the best high cri light i ever seen
- small alu heatsink so all sit in top of the light
- high transmission coated front lens
- bored out for 18350er cells
- drill some holes into the cooling fins
- add some tritium
Now the story goes on…
i modified the cailcap switch a little bit and implement a battery monitor so i can always see the charge status of the 18350er cell. but not some battery monitor, this is a µc controlled battery monitor that need ultra less current so it can run for years without reoplacing/recharging the cell.
how i did this:
- ordered some attiny13 in mlf 10 package (only 3mm edge lenght)
- modified the arduino ide for programming the tinny´s
- write some code with the attention to save as much current as possible
- wire the tinny with some resistors and a led
- put all insight the tailcap switch
- made a transparant tailcap boot (my first one, not perfect as it can be)
some pictures during the work:
Now you maybe ask what is this doing? ok, heres the explanation:
- the tiny is always on when the light is off
- it activates the output pin with the voltage devider (it is most of times off to save current)
- it messures the voltage during the devider and compares it with the internal reference voltage of 1,1 volts
- if the battery is full the led blinks 4 time (3/4 full - 3 times; 1/2 full - 2 times, 1/4 - 1 blink)
- then the tiny sleeps for 4 seconds to save current and the game begins again
Here you can see it:
and here:
Thanks for looking, Markus
edit: i forgott, this solution draws only 4µA when the tiny sleeps
