I hope there is a kind of design, can ensure that no matter how I place my phone on the "PAD", there are at least two points can connect to the PART that plug in the usb of my phone. Then when I don't need use my phone, I put it on the PAD without doing other things, it starts charging (although the connection may not stable, there is a trade off between convenience and charging speed). So I don't need to plug the usb cable because I hate that.
If you like my project or have any suggestion or anything want to say, please leave a comment! ^-^