def set_min_intensity(self, intensity):
		if intensity == 'AUTO':
			self.min_auto_scale = True
		else:
			self.min_auto_scale = False
			self.min_intensity = float(intensity)
		self._clear_intensity()
Set Y axis minimum intensity in decibels (i.e. dB value at bottom of 
dataset/ETHPy150Open adafruit/FreqShow/model.py/FreqShowModel.set_min_intensity