I’m using a 5mm RGB LED (common anode) to display charging status (red and green) and bluetooth activation (blue). This is ok with the charging module since it pulls down the LED’s cathodes with open collector circuits. Unfortunately my bluetooth module is powered directly by an output port of the Attiny85, and I have to use this pin also to drive the blue LED since all other ports are in use. So I quickly soldered this open collector circuit with a NPN transistor I had lying around. Do you notice the little 603 resistor between base and emitter?
… and wrapped:
The driver PCB in place with a printed spacer. The space under the PCB is filled with heat conducting cubes to ensure a good thermal connection between driver and copper disk, both for cooling the 7135 and thermal regulation.
The bluetooth board sandwiched on top of the driver with another spacer on top.
Inserted cells and the charging PCB which sits firmly in grooves. Soldered a lot of wires …
Before screwing in the botton plate this blue printed part is plugged in, it fixes the cells in axial direction and presses the boards sandwich firmly to the copper plate.
After watching your video FM I’m left speechless. I’m really not sure what to say except Black Magic is alive and well in your household. The Bluetooth adds an extra dimension to what was already an amazing lantern.
You achieved so much with this where others failed. In particular flashlight manufacturers.
Well done and still speechless. Wow.
I finally took time to watch the videos presented in the first post. (And read the first post too… I never realized the first post now has the complete finished project.) Anyhow Mike, in single word, AWESOME!