1. There should be a QR code generator on the mobile phone. Enter the desired text in the QR code generator and click Generate.
2. First count the lines of the generated QR code. Here, a * * * is 25 rows, with arbitrary size, and a small square of 2mm can be used, with a length of ***5cm.
3. Draw in a proper position. For the convenience of scribing, draw a horizontal line with 2mm and draw on all sides. This can facilitate the connection and not bend too much.
4. Connect the lines on both sides with a pencil. Generally, a two-dimensional code has three corners and seven squares on each side. If you are afraid of the wrong number of squares, the small square inside the square will occupy three squares and nine squares, line by line, and then put pen to paper when the number is right.
5. If you don't feel comfortable, you can draw a diagonal line on the place to be blackened with a pencil first, and erase the grid drawn with a pencil. Go and scan it to see if it can be swept out. You can scan it with WeChat.