python - 我怎样才能执行第二个功能？

Question

我已将心率传感器正确连接到 Raspberry Pi。

现在:[程序运行没有错误，但是第二个函数(send_data)不起作用。]

第一个功能:读取传感器值。第二个功能:发送数据。

传感器工作正常。但是没有发送传感器数据，第二个功能不起作用。为了解决这个问题，我付出了很多努力。

'''

import requests
import time
import Adafruit_ADS1x15

thingspeak_key = "API_KEY" 

class hr:
    def __init__(self):

        adc = Adafruit_ADS1x15.ADS1015()
        GAIN = 2/3  
        curState = 0
        thresh = 525  
        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)

        while True:
            Signal = adc.read_adc(0, gain=GAIN)   
            curTime = int(time.time()*1000)

            sampleCounter += curTime - lastTime;      
            lastTime = curTime
            N = sampleCounter - lastBeatTime;    

            if Signal < thresh and N > (IBI/5.0)*3.0 :  
                if Signal < T :                     
                  T = Signal;                       

            if Signal > thresh and  Signal > P:          
                P = Signal;                             
                                         
            if N > 250 :                                  
                if  (Signal > thresh) and  (Pulse == False) and  (N > (IBI/5.0)*3.0)  :       
                  Pulse = True;                               
                  IBI = sampleCounter - lastBeatTime;         
                  lastBeatTime = sampleCounter;               

                  if secondBeat :                        
                    secondBeat = False;                 
                    for i in range(0,10):             
                      rate[i] = IBI;                      

                  if firstBeat :                        
                    firstBeat = False;                  
                    secondBeat = True;                  
                    continue                            

                  runningTotal = 0;               

                  for i in range(0,9):                
                    rate[i] = rate[i+1];               
                    runningTotal += rate[i];            

                  rate[9] = IBI;                          
                  runningTotal += rate[9];              
                  runningTotal /= 10;                    
                  BPM = 60000/runningTotal;               
                  self.data_hr=str(BPM)
                  print ('BPM: {}'.format(self.data_hr))

            if Signal < thresh and Pulse == True :   
                Pulse = False;                      
                amp = P - T;                           
                thresh = amp/2 + T;             
                P = thresh;                           
                T = thresh;

            if N > 2500 :                      
                thresh = 512;                        
                P = 512;                            
                T = 512;                            
                lastBeatTime = sampleCounter;           
                firstBeat = True;                     
                secondBeat = False;                 
                print ("no beats found")
    def send_data(self):
        
        r = requests.post('https://api.thingspeak.com/update?api_key=API_KEY', data = {'api_key':thingspeak_key, 'field1':format(self.data_hr)})
        
        time.sleep(0.005)

if __name__ == "__main__":
    x=hr()
    x.self.send_data()

'''

Answer 1

您的问题来自:

if __name__ == "__main__":
  __init__("self")

您正在尝试直接调用该类的构造函数，而 python 不知道 __init__ 在定义它的类之外是什么，因为它是局部作用域。此外，"self" 是一个字符串，而不是一个对象。

您可以将其替换为:

if __name__ == '__main__':
    heartrate = hr()

这将创建一个对象并调用构造函数。您不需要添加 self，因为 python 已经知道类构造函数指的是什么。

但是，您会陷入 hr 类构造函数的 while 循环中，因此我建议将您的构造函数(__init__ 函数)拆分为单独的函数并调用他们分开。