使用Python的FSR

Question

所以我对编程了解不多，我的物理高级研究项目需要帮助。我有一个力敏电阻器(Interlink Electronics 1.5“Square)，我正在使用phidgets.com提供的编程(我找到的编程附在下面)。我的问题是，我的传感器只有在存在公认的刺激时才进行测量，我想让它连续测量。我如何更改编程使其连续测量？

#!/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

在以下行中：

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

，则必须将其更改为无限循环(直到关机)或其他值。问题是，对于您放在for循环范围内的内容，它是非常开放的。我会在网上查看for循环和传感器的示例，这样就不会出现任何问题。

您可能希望了解轮询的概念，并了解模块timeit

Answer 2

如果你在Unix机器上，你可以设置一个cron作业来运行一个简单的逻辑程序。您将删除所有的事件处理程序，只需连接到Phidget设备，然后使用: value = interfaceKit.getSensorValue(sensorindex)从传感器获取读数，然后需要将值写入文件。

如果您想让程序在终端或其他地方运行，您可以再次删除事件处理程序，并在附加Phidget之后将一个循环放入代码中。

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

这将得到一个读数每5秒，直到有人按下ctrl-c。

祝好运!