This module can be applied to intellectual robot, obstacle avoidance...
This kit comes with AlphaBot robotic platform (line tracking, obstacle...
Atmel ATmega32U4 microcontroller comes preloaded with an Arduino-compatible bootloader, and the board includes dual motor drivers that can deliver 1.7 A per channel to two brushed DC motors. Pololu 3119
The core of a small robot, either as an auxiliary controller atop a Raspberry Pi base or as a complete control solution on its own. Its Atmel ATmega32U4 microcontroller comes preloaded with an Arduino-compatible bootloader. This version does not include any through-hole components or connectors, allowing for customized assembly or standalone use. Pololu 3118
Adafruit 16-Channel PWM / Servo HAT for Raspberry Pi - Mini Kit (Adafruit 2327)
Banana Pi - BerryClip 6led add-on DIY board
Banana Pi - GPIO extend board
Banana Pi - I2C GPIO extend board
Expansion Shield X200 is a most cost-effective shield which could apply to Raspberry Pi Model B+ and Raspberry Pi 2 Model B. It integrates a lot of very useful functions such as RTC real time clock; audio input and output; VGA output; USB hub; WIFI; 8-way GPIO; DFR0357
Expansion Shield X300 with RTC real time clock; audio input and output; USB hub; Bluletooth, WIFI; SATA interface. Compatible with Raspberry Pi Model B+, Pi 2 Model B and Pi 3 Model B
A highly cost-effective audio hat which fits on the GPIO of the Raspberry Pi B+/2B/3B, uses i2S interface audio solution, supports 24-bit /192KHz high quality sound, compatible with other audio equipment via RCA lotus socket, includes a built-in high fidelity headphone amplifier, where you can plug in a 3.5mm audio jack directly. DFR0449
Highly cost-effective multimedia hat compatible with the Raspberry Pi Model B+/2B/3B. Decodes and separates voices from HDMI signal, completely solving the poor quality problem with Raspberry Pi integrated sound card. DFR0450
GertDuino is an Arduino and Arduino Uno compatible GPIO expansion board for use with the Raspberry Pi by Gert van Loo.
The Raspberry Pi GPIO Triple Expansion Board converts the single GPIO headers on your Raspberry Pi into three parts. DFR0385