HX711压力传感器+树莓派python驱动程序

 

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# -*- coding: utf-8 -*- import RPi.GPIO as GPIO import time #VCC接1号针脚，GND接6号针脚，SCK接11号针脚，DT接13号针脚 class Hx711():     def setup(self):         self.SCK = 11    # 物理引脚第11号，时钟         self.DT = 13     #物理引脚第13号，数据         self.flag=1      #用于首次读数校准         self.initweight=0   #毛皮         self.weight=0       #测重         self.delay=0.09     #延迟时间         GPIO.setwarnings(False)         GPIO.setmode(GPIO.BOARD)       # Numbers GPIOs by physical location         GPIO.setup(self.SCK, GPIO.OUT)      # Set pin's mode is output         GPIO.setup(self.DT, GPIO.IN)         GPIO.setup(self.DT, GPIO.IN, pull_up_down=GPIO.PUD_UP)                   def start(self):         GPIO.output(self.SCK,0)         if GPIO.input(self.SCK):             time.sleep(self.delay)         value=0         while GPIO.input(self.DT):             time.sleep(self.delay)         #循环24次读取数据         for i in range(24):             GPIO.output(self.SCK,1)             if(0==GPIO.input(self.SCK)):                 time.sleep(self.delay)             value=value<<1        #左移一位，相当于乘2，二进制转十进制             GPIO.output(self.SCK,0)             if GPIO.input(self.SCK):                 time.sleep(self.delay)             if GPIO.input(self.DT)==1:                 value+=1         GPIO.output(self.SCK,1)         GPIO.output(self.SCK,0)         value=int(value/1905)       #1905为我传感器的特性值，不同传感器值不同。可先注释此步骤，再去测一物体A得到一个值X,而后用X除以A的真实值即可确定特性值         if self.flag==1:            #第一次读数为毛皮             self.flag=0             self.initweight=value        #初始值         else:             self.weight=abs(value-self.initweight)  #当前值减毛皮得测量到的重量             print(self.weight)     if __name__=='__main__':     send=Hx711()     send.setup()     while True:         send.start()

　　

 

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# -*- coding: utf-8 -*- import RPi.GPIO as GPIO import time   #进程测试 from multiprocessing import Process,Manager     #VCC接1号针脚，GND接6号针脚，SCK接11号针脚，DT接13号针脚 class Hx711():     def setup(self):         self.SCK = 11    # 物理引脚第11号，时钟         self.DT = 13     #物理引脚第13号，数据         self.flag=1      #用于首次读数校准         self.initweight=0   #毛皮         self.weight=0       #测重         self.delay=0.09     #延迟时间         GPIO.setwarnings(False)         GPIO.setmode(GPIO.BOARD)       # Numbers GPIOs by physical location         GPIO.setup(self.SCK, GPIO.OUT)      # Set pin's mode is output         GPIO.setup(self.DT, GPIO.IN)         GPIO.setup(self.DT, GPIO.IN, pull_up_down=GPIO.PUD_UP)                             def GetData(self,share_data):         while 1:                           if share_data[9]==1:                 print("weight break!")                 break                       GPIO.output(self.SCK,0)             if GPIO.input(self.SCK):                 time.sleep(self.delay)             value=0             while GPIO.input(self.DT):                 time.sleep(self.delay)             #循环24次读取数据             for i in range(24):                 GPIO.output(self.SCK,1)                 if(0==GPIO.input(self.SCK)):                     time.sleep(self.delay)                 value=value<<1        #左移一位，相当于乘2，二进制转十进制                 GPIO.output(self.SCK,0)                 if GPIO.input(self.SCK):                     time.sleep(self.delay)                 if GPIO.input(self.DT)==1:                     value+=1             GPIO.output(self.SCK,1)             GPIO.output(self.SCK,0)             value=int(value/1905)       #1905为我传感器的特性值，不同传感器值不同。可先注释此步骤，再去测一物体A得到一个值X,而后用X除以A的真实值即可确定特性值             if self.flag==1:            #第一次读数为毛皮                 self.flag=0                 self.initweight=value        #初始值             else:                 self.weight=abs(value-self.initweight)  #当前值减毛皮得测量到的重量                 #print(self.weight)                 time.sleep(0.2)                 share_data[1]=self.weight     if __name__=='__main__':           managerdata=Manager().dict()     sharelock=Manager().Lock()     managerdata[0]=0# flag     managerdata[1]=0# weight data           managerdata[9]=0# 结果图像                     send=Hx711()     send.setup()           #1采集图像进程        t1=Process(target=send.GetData,args=(managerdata,))     t1.deamon=True  #伴随主进程关闭而关闭     t1.start()            while True:         print('wegth',managerdata[1])         time.sleep(1)