SRF02 ultrasonic sensor [Discontinued] _ARD_SHIELD_PROTO Pullup resistors are added for

Pullup resistors are added for the SD card and optional SPI flash chip (the empty 8-pin location on the bottom side)

The Adafruit Feather 32u4 Bluefruit combines an Arduino-compatible microcontroller with Bluetooth® Low Energy

RPLIDAR A2 adopts laser triangulation ranging principle and with high-speed RPVision range engine

Light compact

two for the keyboard

SRF02 ultrasonic sensor [Discontinued] _ARD_SHIELD_PROTO Pullup resistors are added forThis low cost ultrasonic ranger has both I2C and Serial interfaces. New AutoTune algorithms intelligently back the minimum range right up to the transducer ringdown for the very best performance possible, automatically, in the background, and with no calibration cycles necessary. Additional new commands allow for separate burst and ranging control. The SRF02 features both I2C and a Serial interfaces. The serial interface is a standard TTL level UART