I need to design an optocoupler isolation circuit, the input is a 5-24v digital signal, the output is 3.3v connected to the GPIO port (digital input DO) of stm32, please recommend an optocoupler chip...
After the SD card is initialized, it keeps sending commands. When will the initialization be completed? The order of sending commands is: CMD5-------->CMD0------>CMD1-------->ACMD41(CMD55+AMCD41) ----...
I transplanted the DM9000AEP driver under the BOOTLOADER of the Youlong PXA270 development board. The hardware is also designed according to the DM9000AEP manual, but I can't read the PID and VID. Wha...
The root causes of problems in the building control industry and the establishment of a standard system - Professor Jiang Yi, an academician of the Chinese Academy of Engineering Recently, the "Engine...