1. There should be a QR code generator on the mobile phone. Enter the desired text in the QR code generator, and then click Generate.
2. First count the number of lines in the generated QR code. Here, a * * * is 25 rows, with any size. You can use a small square of 2mm and a length of ***5cm.
3, in the right place, in order to facilitate the line, 2mm draw a horizontal, four sides. This can facilitate the connection without bending too much.
4. Connect the lines on both sides with a pencil. Generally, a QR code has three corners and seven squares on each side. If you are afraid that the number of squares is wrong, the small squares in the squares will occupy three squares and nine squares, one line at a time. If the number is right, then put pen to paper.
If you don't feel at ease, you can draw a diagonal line in the place to be blackened with a pencil, erase the grid drawn with the pencil and sweep it to see if you can sweep it out. You can use WeChat to scan it.