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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# sensors/__init__.py
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#
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# Copyright 2020 Ron Wellsted <ron@wellsted.org.uk>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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# MA 02110-1301, USA.
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#
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#
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import re, smbus
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i2cbus = None
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debug = true
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# find out which revision of RPi we are running on
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info = open('/proc/cpuinfo')
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for line in info:
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line = line.rstrip()
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if re.search('Revision', line)
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x, x, rev = line.split()
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if rev = '0002':
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i2cbus = 0
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else:
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i2cbus = 1
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# BME280 Temperature, Pressure & Humidity sensor
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_bme280_probe_ = [0x76, 0x77]
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bme280_address = None
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# BH1750 Ambient light level sensor
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_bh1750_probe_ = [0x5c, 0x23]
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bh1750_address = None
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# PCF8574 8 pin I/O device (wind direction sensor)
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_pcf8574_probe_ = [0x20, 0x21, 0x22, 0x24, 0x25, 0x26, 0x27]
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pcf8574_address = None
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if i2cbus is not None:
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bus = smbus.SMBus(i2cbus)
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for device in _bme280_probe_:
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try:
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bus.read_byte(device)
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bme280_address = device
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except: # exception if read_byte fails
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pass
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for device in _bh1750_probe_:
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try:
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bus.read_byte(device)
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bh1750_address = device
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except: # exception if read_byte fails
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pass
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for device in _pcf8574_probe_:
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try:
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bus.read_byte(device)
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pcf8574_address = device
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except: # exception if read_byte fails
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pass
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if debug:
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if i2cbus is not None:
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print('i2cbus=',i2cbus)
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if bme280_address is not None:
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print('bme280=', hex(bme280_address))
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else:
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print('bme280 not found')
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if bh1750_address is not None:
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print('bh1750=', hex(bh1750_address))
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else:
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print('bh1750 not found')
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if pcf8574_address is not None:
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print('pcf8574=', hex(pcf8574_address))
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else:
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print('pcf8574 not found')
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else:
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print('i2cbus not found, sensors not availabe')
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# end of if debug
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