The right one it was! Put a few streaks over it with a well sharpened pencil and now the light always starts up on high mode now. Thanks!
I must admit, I did check the date on the posting that mentioned the pencil trick. Despite the following posts I had to check that it wasn’t posted on 1st of April
No, capacitor on a 105C is used for removing potential power spikes to mcu also 105C memorises in power on state, not power off
but, on other hand you can reprogram attiny13a with one of many wonderful firmwares provided by valued blf members.
I moded a flashlight for a friend with this driver : https://www.fasttech.com/products/1186301
as he told me it has last memory. unfortunately I don’t have the equipment to flash a driver.
Well you need the AVRISP drivers, here this will help
Once you get the driver loaded, and you get a .hex file to write
copy the batch file and the .hex to c:\usbavr (whatever directory name you want…I used that one because it’s easier to remember)
edit the .bat file and ensure you have the name of the .hex file in the right spot
open a command prompt, go into that directory
then run the usbavr.bat batch file and if you have the pins wired right, viola, it will flash the new .hex to the ATtiny
This is for the Nanjg 105C’s NOT for the other cheapie drivers, the pencil trick is the one for those above drivers…
What a wonderful and easy mod!
I have a light I really disliked due to it’s next mode memory. Only had 1 capacitor so it was easy to try. Put some penciltrace on it and now it always starts in high. Just as that light should be in my opinion. Takes about half a second for it to turn to high, good enough. Not a problem to switch modes and quick to return to high if I want to.
Yes, I have this type of driver and have done memory reset on it (long time ago - used resistor at the time). So very likely it is still possible.
You can try small grit sandpaper and rub the top clean, then darken the whole thing with pencil. Be generous, this is just to test it. If you get one-mode afterwards (high only), then the reset can work.
Just slowly rub off the pencil trace and try again. At one point you should get the comfortable reset time.
Yes, idea is to make a small connection across the capacitor that will cause it to discharge faster and “forget” in which mode flashlight was when Power OFF accrued.
You first need to clean soldering points (as sugested by Pulsar13) because those contact are often coated with rosin core that is in solder paste and you do this with ordinary graphite pencil because graphite is conductor as you already know…