Parallel Port Control Made Easy - parashell allows control of a PC parallel port (input and output) with simple command line arguments. The simplicity of these programs make it very easy to use in scr ipts. Control stepper motors, Relays, LEDs, etc..

cc24240 demo modification with leds

Using LEDs as detectors

9534 芯片介绍。用于图像处理 主用用处车载单片机-The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel 2 Input/Output (GPIO) expansion for I C-bus/SMB