Assembled Adafruit 0.56" 4-Digit 7-Segment Display - w/ I2C Backpack QT - Green _RPI_CASE_AUDIO This shield directly supports Xbee

This shield directly supports Xbee and Xbee form factor Wi-Fi

1x Grove proximity Sensor 90cm

the URM07 is definitely the best choice

There is an onboard USB interface to test AT commands and capture GPS data and more

This is a high-quality SparkFun hoodie with a front pocket

Assembled Adafruit 0.56" 4-Digit 7-Segment Display - w/ I2C Backpack QT - Green _RPI_CASE_AUDIO This shield directly supports XbeeWhat's better than a single LED? Lots of LEDs! A fun way to make a small display is to use an 8x8 matrix or a 4 digit 7 segment display. Matrices like these are 'multiplexed' so to control all the seven segment LEDs you need 14 pins. That's a lot of pins, and there are driver chips like the MAX7219 that can control a matrix for you but there's a lot of wiring to set up and they take up a ton of space. Here at Adafruit we feel your pain! After all,