def set_brightness(self, brightness):
if brightness > <NUM_LIT:15>:<EOL><INDENT>brightness = <NUM_LIT:15><EOL><DEDENT>brightness |= <NUM_LIT><EOL>self.brightness = brightness<EOL>self.firmata.i2c_write(<NUM_LIT>, brightness)<EOL>
Set the brightness level for the entire display
@param brightness: brightness level (0 -15)