Ok, this project is not any research for serious Wireless Power, with high efficiency, it is just some free time Microcontroller project, and all the variable and setting in this project is being obtain through try and error, and it doesn’t involve any complex calculation for electromagnetic stuff. Do comment if you have any idea or better way to improve the system.
Basically, I have a Sun Jar, which is a solar powered lamp, that it is like you could store the sunlight in the jar. Charge it up at daytime, and use the light at night. (you can Google “Sun Jar” for more information)