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05_wind_speed_meter_v1.0.py
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05_wind_speed_meter_v1.0.py
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from ABE_ADCPi import ADCPi
from ABE_helpers import ABEHelpers
import time
import threading
import os
import commands
import re
import struct
import ctypes
import socket
import math
#this SW is for prototype model using sensors F200-201/2
###################################
## begin: main parameters override
file_report_period = 10
## HW wiring (-1 means - not connected)
a2d_chan_speed = 1
a2d_chan_direction = -1
a2d_chan_vcc = -1
## HW parameters
wind_sensor_radius = 0.1 # meters
## begin: main parameters override
###################################
class sample():
def __init__(self):
self.sample_time_stamp = None
self.sample_time_span = 0
self.speed_pulses = 0
self.speed_m_per_sec = 0.0
self.direction_voltage = 0.0
self.direction_code = ""
class wind_speed_meter():
def __init__(self):
self._a2d_chan_speed = a2d_chan_speed
self._a2d_chan_direction = a2d_chan_direction
self._a2d_chan_vcc = a2d_chan_vcc
self._file_report_period = file_report_period
self._i2c_helper = ABEHelpers()
self._bus = self._i2c_helper.get_smbus()
self._adc = ADCPi(self._bus, 0x68, 0x69, 12)
self._CtrlPort = 8200
self._IPAddr = self.get_local_ip()
self._samples = list()
self._samples_lock = threading.Lock()
self._thread_sampling = None
self._thread_reporting = None
self._stop_requested = False
def get_local_ip(self):
ifconfig_cmd = commands.getoutput("ifconfig")
patt = re.compile(r'inet\s*\w*\S*:\s*(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})')
addr_list = patt.findall(ifconfig_cmd)
for addr in addr_list:
if addr == "127.0.0.1":
continue
## if(self._nettype == NETTYPE.CELL):
## if(addr.find("192.168.") == 0):
## continue
if(addr.find('.')>0):
return addr
return "127.0.0.1"
def start(self):
self._stop_requested = False
self._thread_sampling = threading.Thread(target=self.thread_sampling)
self._thread_sampling.start()
self._thread_reporting = threading.Thread(target=self.thread_reporting)
self._thread_reporting.start()
def thread_reporting(self):
print("reporting thread started")
mc_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
#mc_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
mc_socket.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 100)
mc_socket.bind((self._IPAddr, 0))
#mreq = struct.pack('4sl', socket.inet_aton("224.0.150.150"), socket.INADDR_ANY)
mreq = struct.pack('4sl', socket.inet_aton("224.0.1.200"), socket.INADDR_ANY)
mc_socket.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
#mc_socket.sendto("init", ("224.0.150.150", 8100))
time_last_report = time.time()
while(self._stop_requested != True):
time_now = time.time()
if(time_now - time_last_report < self._file_report_period) or (time_now < time_last_report):
time.sleep(0.2)
continue
if(len(self._samples) > 0):
self._samples_lock.acquire()
smpl = self._samples.pop(0)
print("extracted speed: {} ({}). list len: {}".format(str(smpl.speed_m_per_sec), smpl.speed_pulses, len(self._samples)))
self._samples_lock.release()
time_last_report = time_now
def thread_sampling(self):
print("sampling thread started")
speed_voltage_last = 0
speed_pulses_counter = 0
last_sample_timestamp = 0
time_now = time.time()
time_last_sampling = time_now
while(self._stop_requested != True):
time_now = time.time()
#read voltage from speed sensor
speed_voltage = self._adc.read_voltage(self._a2d_chan_speed)
if( (speed_voltage > 0) and (speed_voltage_last == 0)):
#count only transitions from low to high signal
speed_pulses_counter += 1
#print("pulses: " + str(speed_pulses_counter))
speed_voltage_last = speed_voltage
if(time_now - time_last_sampling < self._file_report_period) or (time_now < time_last_sampling):
# time.sleep(0.001)
continue
smpl = sample()
smpl.sample_time_stamp = time_now
smpl.sample_time_span = time_now - time_last_sampling
smpl.speed_pulses = speed_pulses_counter
smpl.speed_m_per_sec = (speed_pulses_counter*2*math.pi*wind_sensor_radius)/smpl.sample_time_span
if(self._a2d_chan_vcc != -1):
vcc = self._adc.read_voltage(self._a2d_chan_vcc)
if(a2d_chan_direction != -1):
smpl.direction_voltage = self._adc.read_voltage(self._dir_channel)
smpl.direction_code = ""
self._samples_lock.acquire()
self._samples.append(smpl)
print("speed: {} ({}). list len: {}".format(str(smpl.speed_m_per_sec), smpl.speed_pulses, len(self._samples)))
self._samples_lock.release()
speed_pulses_counter = 0
time_last_sampling = time.time()
def Stop(self):
if(self._thread == None):
return
self._stop_requested = True
if(self._thread.isAlive()):
self._thread.join();
self._thread = None
sm = wind_speed_meter()
sm.start()