Arduino UNO Board with a joystick and 4 LEDs, control the movement of the joystick (up, down, left, right) to light up corresponding LEDs. The project code that includes the optional joystick button ...

I2C also requires pull-up resistors on the data (SDA) and clock (SCL) buses. We used two pull up resistors soldered to the 5 volt output of the Arduino shield and SCL/SDA.

SparqEE CELLv1.0 is a compact certified cellular board that plugs directly into Arduino and the Raspberry Pi shields, letting you piggyback on networks all over the world.