QuadQuad2Drv is the upgrade to QuadQuad and features much higher performance, as well as advanced closed loop PID control.

The board allows position and velocity information to be read from up to four incremental quadrature encoders simultaneously via SPI. These encoders are typically found on the shaft of a motor, allowing the motor rotation angle and velocity to be measured. When used on a robot wheel motor, this would allow you to measure how far your robot has moved and how fast and makes closed-loop control possible.

Measurement Features: Four quadrature channels (sampled 4x per detent) | Provides position (8, 16 or 32-bit), velocity, status and timing metadata | Velocity up to 50,000 transitions/s with resolution of 4 transitions/s | Home/index and edge inputs

Control Features: Control up to four DC motors using PWM and direction outputs | Two 6A 30V motor drivers on board | Power, position and velocity control modes using PID | Power, velocity and acceleration limit settings | Position and velocity ramp commands | Loop rate of 500Hz

Misc Features: SPI slave interface | Streamed data packets | Operating voltage 3.3V with 5V tolerant SPI pins | Bootloader for firmware updates via UART serial | Great for N20 gearmotors such as Pololu HP | Arduino library and demo available | PIC library available on request

The PCB comes with a block header, allowing for easy connection with an Arduino and quadrature encoders. A complete Arduino library and demo code is available for free, as well as a Datasheet detailing physical connections and protocol. The microprocessor will also be made available for implementation directly onto your own robot in the future.

I hope you like this gadget and further suggestions or requests are always welcome.