yzhanping

This is the pcb of A10C STICK of Tomaster, the IC model HEF4021B it uses; the interface definition is shown in the figure 

I found the root of the problem. It was my fault. You must not use 5V as the power supply of CD4021. 3.3V can work normally, and 5V will burn....

I think your problem is on the expansion board. My expansion board can normally replace the Tumaster a10c /F18C grip, recognize 24 triggers; and can realize 128 triggers in series;...

I think there are many roads to reach Rome. You can amplify the analog voltage through an amplifier to achieve pressure sensor recognition, such as GS8551. If you need a...