You have a secret that you can't tell her/him directly?Nah, here you can use this attiny85 and ask her/him to plug the attiny to laptop, PC or anything that have usb serial port.
How to make it? So simple, Here it goes!
(FYI, you must install the board attiny first before run the sketch. And how to upload the sketch is little bit different with boards Arduino, You need to wait until compile finished, then plug the attiny in the USB port of your laptop or PC.)
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