I want to use DeviceIoControl to open a sound card driver device, but when compiling, an error message appears, saying that the variable WODM_OPEN is not defined. What should I do? The program is as f
Common control interface
EN:Enable. Enable the chip to work. When it is needed, open the EN pin, and when it is not needed, close it. Some chips are high enable, some are low enable, you need to read
This is a network temperature sensor made of AT89C2051 and DS18B20. It can send the measured temperature to the computer via RS232 bus, or realize network communication via RS485 bus. The compressed p