The SenseHAT is the first official add-on board produced by the Raspberry Pi Foundation.
It has an 8×8 RGB LED Matrix, a little joystick and a range of sensors to measure temperature, humidity, pressure and movement.
The list of matrix commands is show on the left and the sensor values below them
The joystick acts the same as pressing the keyboardd arrow keys and just using it as a switch is the same as pressing the Green Flag
The old commands no longer recommended to use as the sensor value are now automatically updated a few times a second