RGB light board (already tested, feel free to install it)

The principle is very simple, it is a switch from diode to ground. The only thing that I think may be interesting is that we did a simulation during the original design and used three LEDs sharing one resistor (three LEDs share one R 0603 package resistor power 0.1w 0.062*0.062 *25=0.0961<0.1 feasible)
Then the size of the board is slightly larger than the 18650 battery, and the bottom can just fit a battery. What kind of battery and how to charge it? For this point, refer to the 1S battery charging connector of the model aircraft. Just point a nickel piece with your own electric welder and weld it on.
 
Actual test:
Because the space of the board is squeezed, and factors such as aesthetics are taken into consideration, heat dissipation problems arise one after another. I don’t have a temperature measuring instrument at hand, but I look at my 82-year-old hand and it’s not hot, never! ! !
Because the fonts have changed after importing Lichuang EDA Professional Edition, it is recommended to download the attached content.