ho usato questi scrip, segnalati da Ippogrifo. Non ne ho trovati altri. Ho scritto anche al produttore il quale non mi ha ancora risposto.
Codice:
# Copyright (c) 2019 Joseph Hopfmüller
# This module is a fork of Christophe Rousseaus module.
# see: https://github.com/palouf34/veml7700.git
#
# Original coypright notices are reproduced below.
# Changes:
# - fixed critical error in value calculation
# - restructured the constants into dictionaries
# -> with this you have to pass the integration time and gain when initializing the module
#
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
#
#
# Original copyright notices:
#
# Authors: Christophe ROUSSEAU, 2019
#
# This module borrows from the DFROBOT VEML7700 Python library. Original
# Copyright notices are reproduced below.
#
# Those libraries were written for the NODEMCU(LOLIN). This modification is
# intended for the MicroPython and esp8266 boards.
#
#
# Based on the BH1750 driver with VMEL7700 changes provided by
# Auteur : iTechnoFrance
#
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
from machine import I2C, Pin
import time
from micropython import const
#start const
# default address
addr = const(0x10)
# Write registers
als_conf_0 = const(0x00)
als_WH = const(0x01)
als_WL = const(0x02)
pow_sav = const(0x03)
# Read registers
als = const(0x04)
white = const(0x05)
interrupt = const(0x06)
#gain 0.125 0.25 1 2 integration time
confValues = { 25: {1/8: bytearray([0x00, 0x13]), 1/4: bytearray([0x00,0x1B]), 1: bytearray([0x00, 0x01]), 2: bytearray([0x00, 0x0B])}, #25
50: {1/8: bytearray([0x00, 0x12]), 1/4: bytearray([0x00,0x1A]), 1: bytearray([0x00, 0x02]), 2: bytearray([0x00, 0x0A])}, #50
100:{1/8: bytearray([0x00, 0x10]), 1/4: bytearray([0x00,0x18]), 1: bytearray([0x00, 0x00]), 2: bytearray([0x00, 0x08])}, #100
200:{1/8: bytearray([0x40, 0x10]), 1/4: bytearray([0x40,0x18]), 1: bytearray([0x40, 0x00]), 2: bytearray([0x40, 0x08])}, #200
400:{1/8: bytearray([0x80, 0x10]), 1/4: bytearray([0x80,0x18]), 1: bytearray([0x80, 0x00]), 2: bytearray([0x80, 0x08])}, #400
800:{1/8: bytearray([0xC0, 0x10]), 1/4: bytearray([0xC0,0x18]), 1: bytearray([0xC0, 0x00]), 2: bytearray([0xC0, 0x08])}} #800
#gain 0.125, 0.25, 1, 2 integration time
gainValues = { 25: {1/8: 1.8432, 1/4: 0.9216, 1: 0.2304, 2: 0.1152}, #25
50: {1/8: 0.9216, 1/4: 0.4608, 1: 0.1152, 2: 0.0576}, #50
100:{1/8: 0.4608, 1/4: 0.2304, 1: 0.0288, 2: 0.0144}, #100
200:{1/8: 0.2304, 1/4: 0.1152, 1: 0.0288, 2: 0.0144}, #200
400:{1/8: 0.1152, 1/4: 0.0576, 1: 0.0144, 2: 0.0072}, #400
800:{1/8: 0.0876, 1/4: 0.0288, 1: 0.0072, 2: 0.0036}} #800
# fin des constante
# Reference data sheet Table 1 for configuration settings
interrupt_high = bytearray([0x00, 0x00]) # Clear values
# Reference data sheet Table 2 for High Threshold
interrupt_low = bytearray([0x00, 0x00]) # Clear values
# Reference data sheet Table 3 for Low Threshold
power_save_mode= bytearray([0x00, 0x00]) # clear values
# Reference data sheet Table 4 for Power Saving Modes
class VEML7700:
def __init__(self,
address=addr,
i2c=None,
it=25,
gain=1/8,
**kwargs):
self.address = address
if i2c is None:
raise ValueError('An I2C object is required.')
self.i2c = i2c
confValuesForIt = confValues.get(it)
gainValuesForIt = gainValues.get(it)
if confValuesForIt is not None and gainValuesForIt is not None:
confValueForGain = confValuesForIt.get(gain)
gainValueForGain = gainValuesForIt.get(gain)
if confValueForGain is not None and gainValueForGain is not None:
self.confValues = confValueForGain
self.gain = gainValueForGain
else:
raise ValueError('Wrong gain value. Use 1/8, 1/4, 1, 2')
else:
raise ValueError('Wrong integration time value. Use 25, 50, 100, 200, 400, 800')
self.init()
def init(self):
# load calibration data
#self.i2c.writeto_mem(self.address, als_conf_0, bytearray([0x00,0x13]) )
self.i2c.writeto_mem(self.address, als_conf_0, self.confValues )
self.i2c.writeto_mem(self.address, als_WH, interrupt_high )
self.i2c.writeto_mem(self.address, als_WL, interrupt_low)
self.i2c.writeto_mem(self.address, pow_sav, power_save_mode)
def detect(self):
""" Functions is verified is module has detecedself.
this function not implemented for this time
"""
None
def read_lux(self):
""" Reads the data from the sensor and returns the data.
Returns:
the number of lux detect by this captor.
"""
#The frequency to read the sensor should be set greater than
# the integration time (and the power saving delay if set).
# Reading at a faster frequency will not cause an error, but
# will result in reading the previous data
self.lux = bytearray(2)
time.sleep(.04) # 40ms
self.i2c.readfrom_mem_into(self.address, als, self.lux)
self.lux= self.lux[0]+self.lux[1]*256
self.lux=self.lux*self.gain
return(int(round(self.lux,0)))
![[-]](https://forum.raspberryitaly.com/images/square/collapse.png "[-]")
ed è a buon punto, poi pubblico tutto
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