使用Python的FSR

Question

所以我对编程不太了解，我需要帮助我的物理高级研究项目。我有一个力感应电阻（互连电子1.5平方英寸），我使用的编程提供phidgets.com网站（我找到的程序附在下面）。我的问题是，我的传感器只在有一个被识别的刺激时才进行测量，我希望它能持续地进行测量。如何更改程序使其连续测量？在

#!/usr/bin/env python

"""Copyright 2010 Phidgets Inc.
This work is licensed under the Creative Commons Attribution 2.5 Canada License. 
To view a copy of this license, visit http://creativecommons.org/licenses/by/2.5/ca/
"""

__author__ = 'Adam Stelmack'
__version__ = '2.1.8'
__date__ = 'May 17 2010'

#Basic imports
from ctypes import *
import sys
import random
#Phidget specific imports
from Phidgets.PhidgetException import PhidgetErrorCodes, PhidgetException
from Phidgets.Events.Events import AttachEventArgs, DetachEventArgs, ErrorEventArgs, InputChangeEventArgs, OutputChangeEventArgs, SensorChangeEventArgs
from Phidgets.Devices.InterfaceKit import InterfaceKit

#Create an interfacekit object
try:
    interfaceKit = InterfaceKit()
except RuntimeError as e:
    print("Runtime Exception: %s" % e.details)
    print("Exiting....")
    exit(1)

#Information Display Function
def displayDeviceInfo():
    print("|------------|----------------------------------|--------------|------------|")
    print("|- Attached -|-              Type              -|- Serial No. -|-  Version -|")
    print("|------------|----------------------------------|--------------|------------|")
    print("|- %8s -|- %30s -|- %10d -|- %8d -|" % (interfaceKit.isAttached(), interfaceKit.getDeviceName(), interfaceKit.getSerialNum(), interfaceKit.getDeviceVersion()))
    print("|------------|----------------------------------|--------------|------------|")
    print("Number of Digital Inputs: %i" % (interfaceKit.getInputCount()))
    print("Number of Digital Outputs: %i" % (interfaceKit.getOutputCount()))
    print("Number of Sensor Inputs: %i" % (interfaceKit.getSensorCount()))

#Event Handler Callback Functions
def interfaceKitAttached(e):
    attached = e.device
    print("InterfaceKit %i Attached!" % (attached.getSerialNum()))

def interfaceKitDetached(e):
    detached = e.device
    print("InterfaceKit %i Detached!" % (detached.getSerialNum()))

def interfaceKitError(e):
    try:
        source = e.device
        print("InterfaceKit %i: Phidget Error %i: %s" % (source.getSerialNum(), e.eCode, e.description))
    except PhidgetException as e:
        print("Phidget Exception %i: %s" % (e.code, e.details))

def interfaceKitInputChanged(e):
    source = e.device
    print("InterfaceKit %i: Input %i: %s" % (source.getSerialNum(), e.index, e.state))

def interfaceKitSensorChanged(e):
    source = e.device
    print("InterfaceKit %i: Sensor %i: %i" % (source.getSerialNum(), e.index, e.value))

def interfaceKitOutputChanged(e):
    source = e.device
    print("InterfaceKit %i: Output %i: %s" % (source.getSerialNum(), e.index, e.state))

#Main Program Code
try:
    interfaceKit.setOnAttachHandler(interfaceKitAttached)
    interfaceKit.setOnDetachHandler(interfaceKitDetached)
    interfaceKit.setOnErrorhandler(interfaceKitError)
    interfaceKit.setOnInputChangeHandler(interfaceKitInputChanged)
    interfaceKit.setOnOutputChangeHandler(interfaceKitOutputChanged)
    interfaceKit.setOnSensorChangeHandler(interfaceKitSensorChanged)
except PhidgetException as e:
    print("Phidget Exception %i: %s" % (e.code, e.details))
    print("Exiting....")
    exit(1)

print("Opening phidget object....")

try:
    interfaceKit.openPhidget()
except PhidgetException as e:
    print("Phidget Exception %i: %s" % (e.code, e.details))
    print("Exiting....")
    exit(1)

print("Waiting for attach....")

try:
    interfaceKit.waitForAttach(10000)
except PhidgetException as e:
    print("Phidget Exception %i: %s" % (e.code, e.details))
    try:
        interfaceKit.closePhidget()
    except PhidgetException as e:
        print("Phidget Exception %i: %s" % (e.code, e.details))
        print("Exiting....")
        exit(1)
    print("Exiting....")
    exit(1)
else:
    displayDeviceInfo()

print("Setting the data rate for each sensor index to 4ms....")
for i in range(interfaceKit.getSensorCount()):
    try:

        interfaceKit.setDataRate(i, 4)
    except PhidgetException as e:
        print("Phidget Exception %i: %s" % (e.code, e.details))

print("Press Enter to quit....")

chr = sys.stdin.read(1)

print("Closing...")

try:
    interfaceKit.closePhidget()
except PhidgetException as e:
    print("Phidget Exception %i: %s" % (e.code, e.details))
    print("Exiting....")
    exit(1)

print("Done.")
exit(0)

Answer 1

在以下行：

 for i in range(interfaceKit.getSensorCount()):

，必须将其更改为无限循环（直到关闭）或其他内容。问题是，在for循环的范围内，它是非常开放的。我会在网上看for循环和传感器的例子，这样就不会有任何问题。在

您可能需要了解轮询的概念，还需要了解模块timeit

Answer 2

如果您在Unix机器上，您可以设置cron作业来运行一个简单的逻辑程序。删除所有事件处理程序，只需连接到Phidget设备，然后使用：value=接口Kit.getSensorValue（sensorindex），然后需要将值写入文件。在

如果你想让程序从终端或其他地方运行，你可以再次删除事件处理程序，在附加了Phidget之后在代码中放入一个循环。在

print("Press Ctrl-C to quit....")

try:
    while True:
        try:
            value = interfaceKit.getSensorValue(0) # index of your sensor
            print("%i" % (value))
        except PhidgetException as e:
            print("Phidget Exception %i: %s" % (e.code, e.details))

        time.sleep(5) # in seconds

except (KeyboardInterrupt, SystemExit):
    print("Closing...")
    pass

这将每隔5秒读取一次，直到有人按下ctrl-c

祝你好运！在