Raspberry Pi GPIO Expansion Module

This module is designed specifically for the Raspberry Pi B+/A+ IO expansion modules, which can effectively solve the Raspberry send IO port insufficient. Module uses four 74HC595 chips to expand 32 IO ports. As shown above, the top of the module will expand the IO of Raspberry Pi again that can be cascaded for more IO expansion modules can theoretically unlimited expansion.Specification：Product Features： Expanded 32 GPIO Infinity connection for the same module Use wiringPi API ,sample code Compatible with Raspberry Pi A+,B,B+/2.Port： Raspberry Pi 2X13 port Raspberry Pi 2X13 cascade port Q0-Q31 expanded IO portProduct Parameters： Working voltage: 2.4V-5V IO voltage: 3.3V Expanded 32 unidirectional IO Connection through SPI 100 MHz (typical) shift out frequency 8-bit serial input 8-bit serial or parallel output Specified from -40C to +85C and from -40C to +125CTypical Application： Drive the lattice screen Driver numeric display Drive matrix LEDProduct Specification：