class Bh1750(AmbientLightSensor):
"""Rohm Semiconductor BH1750FVI ambient light sensor """
class Resolution:
Medium, High, Low = range(3)
def __init__(self, i2c: I2C, address_pin=False):
super().__init__()
self._resolution = 0
self._dev = SMBusDevice(0x5c if address_pin else 0x23, i2c, 100)
self._dev.write_byte(0x07) # reset
self.resolution = Bh1750.Resolution.High
@property
def resolution(self):
return self._resolution
@resolution.setter
def resolution(self, value):
if self._resolution == value:
return
self._resolution = value
self._dev.write_byte(0x10 | self._resolution)
def update(self):
self._lux = self._dev.read_word_be() / 1.2
class Ht16k33(LedDriver):
"""Holtek HT16K33 8x8 matrix LED driver
This is a popular driver found in dev boards such as the [Adafruit LED backpack](
https://learn.adafruit.com/adafruit-led-backpack).
Example:
>>> from time import sleep
>>> from treehopper.api import *
>>> from treehopper.libraries.displays import Ht16k33
>>> board = find_boards()[0]
>>> board.connect()
>>> driver = Ht16k33(i2c=board.i2c, package=Ht16k33.Package.sop20)
>>> while board.connected:
>>> for led in driver.leds:
>>> led.state = True
>>> sleep(0.04)
>>> for led in driver.leds:
>>> led.state = False
>>> sleep(0.04)
"""
_command_brightness = 0xe0
_command_blink = 0x80
def __init__(self,
i2c: I2C,
package: int,
a0=False,
a1=False,
a2=False,
address=None):
if not address:
address = 0x70
if a0:
address |= 0x01
if a1:
address |= 0x02
if a2:
address |= 0x04
LedDriver.__init__(self,
num_leds=package,
has_global_brightness_control=True,
has_individual_brightness_control=False)
self._dev = SMBusDevice(address=address, i2c_module=i2c)
self._dev.write_byte(0x21)
self._package = package
self._data = [False] * 128
self._set_global_brightness(1.0)
def _set_global_brightness(self, value: float):
if self.brightness > 0.0:
self._dev.write_byte(Ht16k33._command_brightness
| round(self.brightness * 16) - 1)
self._dev.write_byte(Ht16k33._command_blink | 0x01)
else:
self._dev.write_byte(Ht16k33._command_blink | 0x00)
def flush(self, force=False):
pass
def _led_state_changed(self, led: Led):
index = int(16 * int(led.channel / (self._package / 8)) +
(led.channel % (self._package / 8)))
self._data[index] = led.state
if self.auto_flush:
address = int(index / 8)
self._dev.write_byte_data(address,
bit_list_to_bytes(self._data)[address])
def _led_brightness_changed(self, led: Led):
pass
class Package:
sop20 = 64
sop24 = 96
sop28 = 128
