Grove – 4-Digit Display $7.25 4 digit displays are usually a 12 pin module. In this Grove gadget, we used a TM1637 to scale down the controlling pins into 2 Grove pins.
	Wireless USB Adapter $16.50 USB WiFi (802.11b/g/n) Module: For Raspberry Pi and more.
	Grove – Screw Terminal $3.50 Grove – Screw Terminal with four 3.5mm pitch pins.
	Seeed Grove – I2C Motor Driver $20.42 At the heart is a dual channel H-bridge driver chip that can handle current up to 2A per channel.
	Seeed Grove – Line Finder $4.75 Line finder is designed for line following robots.