我试图在我的 Kivy 应用程序中显示从我的心跳传感器获得的值。我已经尝试使用应用于其他传感器的数据提取方法，但它不适用于该传感器，因为它不包含任何功能。
我尝试了多种不同的方法，但它们都没有返回所需的输出。有人可以看看传感器代码并建议一些方法来在我的 kivy 应用程序中显示输出。
心跳感应器.py
import time
# Import the ADS1x15 module.
import Adafruit_ADS1x15
if __name__ == '__main__':
adc = Adafruit_ADS1x15.ADS1015()
# initialization
GAIN = 2/3
curState = 0
thresh = 525 # mid point in the waveform
P = 512
T = 512
stateChanged = 0
sampleCounter = 0
lastBeatTime = 0
firstBeat = True
secondBeat = False
Pulse = False
IBI = 600
rate = [0]*10
amp = 100
lastTime = int(time.time()*1000)
# Main loop. use Ctrl-c to stop the code
while True:
# read from the ADC
Signal = adc.read_adc(0, gain=GAIN) #TODO: Select the correct ADC channel. I have selected A0 here
curTime = int(time.time()*1000)
sampleCounter += curTime - lastTime; # # keep track of the time in mS with this variable
lastTime = curTime
N = sampleCounter - lastBeatTime; # # monitor the time since the last beat to avoid noise
#print N, Signal, curTime, sampleCounter, lastBeatTime
## find the peak and trough of the pulse wave
if Signal < thresh and N > (IBI/5.0)*3.0 : # # avoid dichrotic noise by waiting 3/5 of last IBI
if Signal < T : # T is the trough
T = Signal; # keep track of lowest point in pulse wave
if Signal > thresh and Signal > P: # thresh condition helps avoid noise
P = Signal; # P is the peak
# keep track of highest point in pulse wave
# NOW IT'S TIME TO LOOK FOR THE HEART BEAT
# signal surges up in value every time there is a pulse
if N > 250 : # avoid high frequency noise
if (Signal > thresh) and (Pulse == False) and (N > (IBI/5.0)*3.0) :
Pulse = True; # set the Pulse flag when we think there is a pulse
IBI = sampleCounter - lastBeatTime; # measure time between beats in mS
lastBeatTime = sampleCounter; # keep track of time for next pulse
if secondBeat : # if this is the second beat, if secondBeat == TRUE
secondBeat = False; # clear secondBeat flag
for i in range(0,10): # seed the running total to get a realisitic BPM at startup
rate[i] = IBI;
if firstBeat : # if it's the first time we found a beat, if firstBeat == TRUE
firstBeat = False; # clear firstBeat flag
secondBeat = True; # set the second beat flag
continue # IBI value is unreliable so discard it
# keep a running total of the last 10 IBI values
runningTotal = 0; # clear the runningTotal variable
for i in range(0,9): # shift data in the rate array
rate[i] = rate[i+1]; # and drop the oldest IBI value
runningTotal += rate[i]; # add up the 9 oldest IBI values
rate[9] = IBI; # add the latest IBI to the rate array
runningTotal += rate[9]; # add the latest IBI to runningTotal
runningTotal /= 10; # average the last 10 IBI values
BPM = 60000/runningTotal; # how many beats can fit into a minute? that's BPM!
print ('BPM: {}'.format(BPM))
if Signal < thresh and Pulse == True : # when the values are going down, the beat is over
Pulse = False; # reset the Pulse flag so we can do it again
amp = P - T; # get amplitude of the pulse wave
thresh = amp/2 + T; # set thresh at 50% of the amplitude
P = thresh; # reset these for next time
T = thresh;
if N > 2500 : # if 2.5 seconds go by without a beat
thresh = 512; # set thresh default
P = 512; # set P default
T = 512; # set T default
lastBeatTime = sampleCounter; # bring the lastBeatTime up to date
firstBeat = True; # set these to avoid noise
secondBeat = False; # when we get the heartbeat back
print ("no beats found")
time.sleep(0.005)
** 我正在尝试添加读数的 kivy 应用程序**
另一个.py文件
from kivy.app import App
from kivy.uix.screenmanager import ScreenManager,Screen
from kivy.properties import ObjectProperty, StringProperty
from kivy.uix.boxlayout import BoxLayout
from kivy.clock import Clock
from kivy.uix.button import Button
from kivy.uix.label import Label
from kivy.lang import Builder
class MainScreen(Screen):
pass
class ScreenThermo(Screen):
def __init__(self,**kwargs):
super(ScreenThermo, self).__init__(**kwargs)
Clock.schedule_interval(self.displayHR, 10)
def displayHR(self,dt):
heartbeat = 'BPM: {}'.format(BPM)
pulse = heartbeat
self.manager.screen_thermo.ids.TempLabel.text = str(pulse)
def on_enter(self, *args):
self.__init__()
pass
class ScreenManagement(ScreenManager):
pass
presentation = Builder.load_file("heartk.kv")
class MenuApp(App):
def build(self):
return presentation
if __name__ == '__main__':
MenuApp().run()
.kv 文件
ScreenManagement:
id: screen_manager
screen_thermo: screen_thermo
MainScreen:
ScreenThermo:
id: screen_thermo
name: 'thermo'
manager: screen_manager
<MainScreen>:
name: "main"
Label:
text: "Welcome"
font_size: 60
halign: 'center'
valign: 'middle'
pos_hint: {'x': .01, 'y': .05}
on_touch_down: app.root.current = "thermo"
<ScreenThermo>:
Label:
text: " Pulse rate"
font_size: 50
pos: (35, 100)
Label:
id: TempLabel
font_size: 60
halign: 'center'
valign: 'middle'
我认为你可以通过一些小的修改来完成你想要的。首先将 a 添加StringProperty到您的ScreenThermo类中，并在该on_enter()方法中启动一个线程来运行您的Heartbeatsensot代码：
from Heartbeatsensot import hearbeatsensot
class ScreenThermo(Screen):
BPM_string = StringProperty('BPM: Not Detected')
def on_enter(self, *args):
Thread(target=hearbeatsensot, args=(self,)).start()
在您的kv文件中，添加对 new 的引用StringProperty：
<ScreenThermo>:
Label:
text: " Pulse rate"
font_size: 50
pos: (35, 100)
Label:
id: TempLabel
text: root.BPM_string # references new StringProperty
font_size: 60
halign: 'center'
valign: 'middle'
现在你只需要把你想显示的任何东西TempLabel放到BPM_string属性中。为此，请更改Heartbeatsensot.py为定义可在Thread. 只需if __name__ == '__main__':将该文件中的替换为def hearbeatsensot(screenThermo):如下所示：
import time
# Import the ADS1x15 module.
import Adafruit_ADS1x15
def hearbeatsensot(screenThermo):
adc = Adafruit_ADS1x15.ADS1015()
# initialization
GAIN = 2/3
.
.
.
screenThermo.BPM_string = 'BPM: 65'
.
.
.
然后，在该方法中，只需使用 somethink like screenThermo.BPM_string = 'BPM: 65'（或您想将其设置为的任何内容）。到基准BPM_string中kv的文件将自动建立一个结合更新TempLabel每当BPM_string被修改。
本文收集自互联网，转载请注明来源。
如有侵权，请联系[email protected] 删除。
我来说两句