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)
Solar panel inside, with a switch to choose Blue or Orange light, and a Light sensor, to automatically turn it on when it is dark. 1x AA battery to store the “sunlight”.
My problem is I don’t have direct sunlight into my room at daytime, that I could use it to charge up the Sun Jar. To charge it, I’ll have to bring this Sun Jar out to my corridor to charge it up, and bring it in at the night. So, I decide to power the Jar up using my USB port, but the whole jar is made of Glass, that I cannot drill a hole for my wire to go into the jar, so, I come out with this idea of creating wireless power to power up the jar.
The main part of the Wireless Power system is the wire coil. I am using small (I don’t know the exact size) multicore wire, and i made it at the size of around 10cm diameter, 15 turn (number of turn, I simply choose 15, no special reason, do leave comment if you have any idea how the number of turn affect the wireless power system). You will need two exactly same coil (one for the LED at the Jar, one to be connected to UMK8), its like one transmitter and one receiver.