Recommend a monolithic learning board

I have a single-chip experimental board, which I designed myself when I was in college (graduated in 2008). I have a patent. I used it to make money when I was in college. I can get more than 4 thousand a semester. Now I have a job, but I won't do it if I lose the market. There is still a little left. If you want a PCB, you can make your own components, and I can provide you with the price of the board making fee (0. 12 yuan per square centimeter). The board is 0.08* 10, and the total is 0.8+0.4= 1.2, and the single board is1.2/. =? 0. 12), patent number (utility model), 200720 1 17636. x，？ The picture shows the invention patent number, which just came down. I don't know how to do it now. If you have any good suggestions, please contact me. If it is valuable, the experimental board PCB will be given away for free. Patents are also for sale. "Single-chip microcomputer combined experimental board" is composed of various modules and has high flexibility. The wiring is not determined by the experimental board itself, and the circuit wiring can be designed according to the schematic diagram. Look at the chart and you will understand. The picture shows a CAD rendering, and the number of modules can reach more than 40, including commonly used digital chips, single-chip computers, AD/DA, operational amplifier display screens, keys, keyboards, etc.