reflow/Arduino_Monitor.py

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Python
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2012-10-26 21:22:31 +00:00
"""
Listen to serial, return most recent numeric values
Lots of help from here:
http://stackoverflow.com/questions/1093598/pyserial-how-to-read-last-line-sent-from-serial-device
"""
from threading import Thread
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import time
import serial
import struct
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status = [0, 23, 23, 0, 0, 0]
oven_connected = False
profile = [
150,
200,
217,
260,
480,
1,
2,
1,
2,
-1,
-6,
60,
180,
60,
150,
20,
40]
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PI_TS_MIN = 0
PI_TS_MAX = 1
PI_TL = 2
PI_TP = 3
PI_TIME_MAX = 4
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PI_TS_RAMP_UP_MIN = 5
PI_TS_RAMP_UP_MAX = 6
PI_TP_RAMP_UP_MIN = 5
PI_TP_RAMP_UP_MAX = 6
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PI_RAMP_DOWN_MIN = 7
PI_RAMP_DOWN_MAX = 8
PI_TS_DURATION_MIN = 9
PI_TS_DURATION_MAX = 10
PI_TL_DURATION_MIN = 11
PI_TL_DURATION_MAX = 12
PI_TP_DURATION_MIN = 13
PI_TP_DURATION_MAX = 14
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def recv_config(ser):
global profile
ser.write(chr(255))
ser.flush()
t = ser.read(30)
profile = struct.unpack("hhhhhhhhhhhhhhhhh", t)
ser.flushInput()
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def receiving(ser):
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global status
try:
time.sleep(2)
recv_config(ser)
except Exception, e:
print e
pass
while 1:
ser.write(chr(254))
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ser.flush()
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status = struct.unpack("hhhhhb", ser.read(11))
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ser.flushInput()
class SerialData(object):
def __init__(self, init=50):
try:
self.ser = ser = serial.Serial(
port='/dev/ttyUSB0',
baudrate=9600, timeout=2)
except serial.serialutil.SerialException:
#no serial connection
self.ser = None
else:
Thread(target=receiving, args=(self.ser,)).start()
def next(self):
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global status
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if not self.ser:
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return status[1]
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try:
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return status[1]
except Exception:
pass
def send_config(self):
if not self.ser:
return
global profile
self.ser.write(struct.pack("hhhhhhhhhhhhhhhhh", profile))
def send_start(self):
if not self.ser:
return False
self.ser.write(chr(251))
return True
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def connected(self):
return self.ser != None
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def __del__(self):
if self.ser:
self.ser.close()
if __name__=='__main__':
s = SerialData()
for i in range(500):
time.sleep(1)
print s.next()