Ch341par.exe Instant

for _ in range(10): write_parallel(255) time.sleep(0.5) write_parallel(0) time.sleep(0.5) ch341par.exe is a simple but effective tool for low-speed parallel port control over USB. While limited compared to full CH341 DLL access, it’s perfect for quick testing, education, and basic automation scripts.

Data: 0x00 Status: 0x79 Control: 0x0F Interpretation depends on your wiring. ch341par.exe -w 255 Now pins 2-9 go high (+5V / 3.3V depending on adapter). Example 3: Set data pins to binary pattern To set D7..D0 = 10101010 (0xAA): ch341par.exe

WCH CH341 Download Page (look for CH341PAR utility) for _ in range(10): write_parallel(255) time

First set all control pins high (inactive except INIT which is active high): ch341par

ch341par.exe -s 0x0C ; 0x0C = 00001100 → INIT=1, others high Then pulse strobe low and back:

For serious projects, consider using the (also from WCH) which gives faster, programmatic access without shelling out to an EXE.