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#!/usr/bin/python3

# -*- coding: utf-8 -*-

#

#  sensors/__init__.py

#

#  Copyright 2020 Ron Wellsted <ron@wellsted.org.uk>

#

#  This program is free software; you can redistribute it and/or modify

#  it under the terms of the GNU General Public License as published by

#  the Free Software Foundation; either version 2 of the License, or

#  (at your option) any later version.

#

#  This program is distributed in the hope that it will be useful,

#  but WITHOUT ANY WARRANTY; without even the implied warranty of

#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

#  GNU General Public License for more details.

#

#  You should have received a copy of the GNU General Public License

#  along with this program; if not, write to the Free Software

#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

#  MA 02110-1301, USA.

#

#

import re, smbus, w1thermsensor

from gpiozero import pi_info

i2cbus = None

debug = True

# find out which revision of RPi we are running on

#info = open('/proc/cpuinfo')

#for line in info:

#    line = line.rstrip()

#    if re.search('Revision', line):

#        x, x, rev = line.split()

rev = pi_info.revision

if rev == '0002':

    i2cbus = 0

else:

    i2cbus = 1

# BME280 Temperature, Pressure & Humidity sensor

_bme280_probe_ = [0x76, 0x77]

bme280_address = None

# BH1750 Ambient light level sensor

_bh1750_probe_ = [0x5c, 0x23]

bh1750_address = None

# PCF8574 8 pin I/O device (wind direction sensor)

_pcf8574_probe_ = [0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x27]

pcf8574_address = None

if i2cbus is not None:

    bus = smbus.SMBus(i2cbus)

    for device in _bme280_probe_:

        try:

            bus.read_byte(device)

            bme280_address = device

        except: # exception if read_byte fails

            pass

    for device in _bh1750_probe_:

        try:

            bus.read_byte(device)

            bh1750_address = device

        except: # exception if read_byte fails

            pass

    for device in _pcf8574_probe_:

        try:

            bus.read_byte(device)

            pcf8574_address = device

        except: # exception if read_byte fails

            pass

if debug:

    if i2cbus is not None:

        print('i2cbus=',i2cbus)

        if bme280_address is not None:

            print('bme280=', hex(bme280_address))

        else:

            print('bme280 not found')

        if bh1750_address is not None:

            print('bh1750=', hex(bh1750_address))

        else:

            print('bh1750 not found')

        if pcf8574_address is not None:

            print('pcf8574=', hex(pcf8574_address))

        else:

            print('pcf8574 not found')

    else:

        print('i2cbus not found, sensors not availabe')

# end of if debug