Clears the entire LED matrix and sets the all the pixels to blank ([0, 0, 0])
clearLEDMatrix
| displayImage
| displayMessage
| raspi
| readAcceleration
| readAngularVelocity
| readHumidity
| readJoystick
| readMagneticField
| readPressure
| readTemperature
| sensehat
| writePixel