Setup: Need to install Twisted, AutoBahnPython, and for the static pages I use lighttpd. sudo apt-get install python-pip sudo easy_install autobahn sudo apt-get install twisted lighttpd
$30,
$10, 
$5ish, 
$4
import Pyro.core
import piface.pfio as cmd
import os
from time import sleep
from sys import exit
from os import fork,chdir,setsid,umask
class Command(Pyro.core.ObjBase):
def __init__(self):
Pyro.core.ObjBase.__init__(self)
def outputStatus(self):
list1=cmd.read_output()
status = '{0:08b}'.format(list1)[::-1]
return status
#output command for piface outputs
def outputCmd(self,pin,value):
cmd.digital_write(pin,value)
return self.outputStatus()
#command to return input statuses
def inputStatus(self):
list1 = cmd.read_input()
status = '{0:08b}'.format(list1)[::-1]
return status
#read cpu temperature
def pitemperature(self):
return open('/sys/class/thermal/thermal_zone0/temp','r').read()
def main():
Pyro.core.initServer()
cmd.init()
daemon = Pyro.core.Daemon()
uri = daemon.connect(Command(),"cmd")
print "cmd port: ", daemon.port
print "cmd uri:", uri
daemon.requestLoop()
if __name__ == "__main__":
try:
pid = fork()
if pid > 0:
exit(0)
except OSError, e:
exit(1)
chdir("/")
setsid()
umask(0)
try:
pid = fork()
if pid > 0:
exit(0)
except OSError, e:
exit(1)
main()
import sys
from pymodbus.client.sync import ModbusTcpClient as ModbusClient
from os import fork,chdir,setsid,umask
from sys import exit
from time import sleep
import time
import os
import Pyro.core
def main():
loop=True
#connect to the piface pyro daemon we created earlier
cmd = Pyro.core.getProxyForURI("PYROLOC://localhost:7766/cmd")
time_pushed=0
pushed_1=False
pushed_2=False
longpush_2=False
count=0
client = ModbusClient('ip_address_of_modbus_IO')
client.close()
while loop:
sleep(.05)
status = cmd.outputStatus()
inputstatus = cmd.inputStatus()
#toggle button turn relay 1 on
if inputstatus[0]=='1' and pushed_1 != True:
if status[0]=='0':
cmd.outputCmd(0,1)
else:
cmd.outputCmd(0,0)
pushed_1=True
if inputstatus[0]=='0' and pushed_1:
pushed_1=False
#toggle button turn relay 2 on
if inputstatus[1]=='1' and pushed_2 !=True:
pushed_2=True
longpush_2=False
time_pushed=time.time()
#if both buttons are pressed for 10 second the reboot the pi
while inputstatus[0]=='1' and inputstatus[1]=='1':
sleep(1)
count=count+1
if(count==10):
os.system("sudo reboot")
#button released
if inputstatus[1]=='0' and pushed_2:
#calculate the time the button was pressed to determine what to do
time_taken = time.time()-time_pushed
pushed_2=False
if(time_taken<.5):
if status[1]=='0':
cmd.outputCmd(1,1)
else:
cmd.outputCmd(1,0)
#send command to remote i/o using modbus to turn on some lamps if you hold the button longer than 1/2 second
if (time_taken>.5):
try:
if(client.connect()):
if(client.read_discrete_inputs(200,1).bits[0]==True):
client.write_coil(0,True)
else:
client.write_coil(2,True)
client.close()
except:
e = sys.exc_info()[0]
f=open('error.log','w+')
f.write(e+'\n')
f.close()
time_pushed=0
#turn off light at certain time
hour=time.localtime(time.time())[3]
minute=time.localtime(time.time())[4]
second=time.localtime(time.time())[5]
if(hour==5 and minute == 0 and second == 0 and status[0]=='1'):
cmd.outputCmd(1,0)
#useful daemon-like code:
if __name__ == "__main__":
try:
pid = fork()
if pid > 0:
exit(0)
except OSError, e:
exit(1)
chdir("/")
setsid()
umask(0)
try:
pid = fork()
if pid > 0:
exit(0)
except OSError, e:
exit(1)
main()
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My total cost:
|
|
$25.00
| |
.05
| |
.20
| |
$10.00
| |
$3.00
| |
Total
|
$38.25
|
get pymodbus and dependencies: sudo apt-get install python-pymodbus python-twisted-conch
:
:
:
from pymodbus.server.async import StartTcpServer
from pymodbus.device import ModbusDeviceIdentification
from pymodbus.datastore import ModbusSequentialDataBlock
from pymodbus.datastore import ModbusSlaveContext, ModbusServerContext
from pymodbus.transaction import ModbusRtuFramer, ModbusAsciiFramer
from twisted.internet.task import LoopingCall
from threading import Thread
from time import sleep
import os
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
temperature =0
class Temp(Thread):
"""
A class for getting the current temp of a DS18B20
"""
def __init__(self, fileName=''):
Thread.__init__(self)
self.tempDir = '/sys/bus/w1/devices/'
list = os.listdir(self.tempDir)
if(list[0][:2]=="28"):
fileName=list[0]
self.fileName = fileName
self.currentTemp = -999
self.correctionFactor = 1;
self.enabled = True
def run(self):
while True:
if self.isEnabled():
try:
f = open(self.tempDir + self.fileName + "/w1_slave", 'r')
except IOError as e:
print "Error: File " + self.tempDir + self.fileName + "/w1_slave" + " does$
return;
lines=f.readlines()
crcLine=lines[0]
tempLine=lines[1]
result_list = tempLine.split("=")
temp = float(result_list[-1])/1000 # temp in Celcius
temp = temp + self.correctionFactor # correction factor
#if you want to convert to Celcius, comment this line
temp = (9.0/5.0)*temp + 32
if crcLine.find("NO") > -1:
temp = -999
self.currentTemp = temp
#print "Current: " + str(self.currentTemp) + " " + str(self.fileName)
sleep(1)
#returns the current temp for the probe
def getCurrentTemp(self):
return self.currentTemp
#setter to enable this probe
def setEnabled(self, enabled):
self.enabled = enabled
#getter
def isEnabled(self):
return self.enabled
def updating_writer(a):
context = a[0]
register = 3
slave_id = 0x00
address = 0x00
#print pi.getCurrentTemp(),str(int(pi.getCurrentTemp()*10))
values = [int(pi.getCurrentTemp()*100)]
context[slave_id].setValues(register,address,values)
store = ModbusSlaveContext(
di = ModbusSequentialDataBlock(0, [0]*100),
co = ModbusSequentialDataBlock(0, [0]*100),
hr = ModbusSequentialDataBlock(0, [0]*100),
ir = ModbusSequentialDataBlock(0, [0]*100))
context = ModbusServerContext(slaves=store, single=True)
identity = ModbusDeviceIdentification()
identity.VendorName = 'pymodbus'
identity.ProductCode = 'PM'
identity.VendorUrl = 'http://github.com/bashwork/pymodbus/'
identity.ProductName = 'pymodbus Server'
identity.ModelName = 'pymodbus Server'
identity.MajorMinorRevision = '1.0'
pi = Temp()
pi.start()
time = 5 # 5 seconds delaytime = 5 # 5 seconds delay
loop = LoopingCall(f=updating_writer, a=(context,))
loop.start(time, now=False) # initially delay by time
StartTcpServer(context, identity=identity, address=("localhost", 502))
#change localhost to your ip address.
. I'm trying to stray away from the expensive industrial world in my home automation projects (namely the PLC). I had many many project ideas for this neat little computer.... homemade digital picture frame, turtle habitat controller, light switches, weather station, thermostat, and on and on. I purchased a PI weather board (found here) which gives you temperature, humidity, barometer , 4 high power dc outputs, and a couple external 1-wire
sensors ports.
:-). I found an old 12v 1000mA AC adapter plenty good enough for the fans.