This module can be applied to intellectual robot, obstacle avoidance...
This kit comes with AlphaBot robotic platform (line tracking, obstacle...
16-channel GPIO expander with an I2C interface microcontroller can interface with 16 fully configurable digital input/output pins. It can produce PWM signals, so you can dim LEDs. It can be set to blink or even breathe pins at varying rates. With a built-in keypad engine, it can interface with up to 64 buttons set up in an 8x8 matrix. BOB-13601
Module with SPI 8-bit I/O Port Expander
Module with I2C I/O Port Expander