The signal output by the CPU is ver

The signal output by the CPU is very small, and the actuating current of the ass is 1 to 2 amps, so each output signal can only drive the corresponding solenoid valve after being amplified. At present, the most commonly used method is to use the P1 port to convert the non-duty cycle pulse signal into a voltage signal of corresponding amplitude to control the three-position three-way solenoid valve, and connect different pipelines by changing the position of the three-position three-way valve To achieve the purpose of boosting pressure, maintaining pressure and reducing pressure. This method has fast dynamic response and easy operation, and requires a special three-position three-way valve, and requires high technology and high development cost. At the same time limited to the current level of knowledge, this article uses another method to meet the required requirements.    This design uses P1 port output high and low battery combinations to be in different states to control the opening and closing of the oil circuit to achieve the purpose of supercharging, holding pressure, and decompression. The P1 port of 80C196KC is used as a quasi-bidirectional input and output port, which is composed of a buffer internal port latch, an internal register and an output buffer and an output buffer, and an output buffer and an output buffer. Resistance structure When the port data changes from 0 to 1, it can generate a stronger pull-up effect in a short time to speed up the transition process: when output, it has a latching effect, that is, it remains unchanged before rewriting the data to the port.