如何使用Raspberry Pi3读取SunRom血压传感器数据

我是IoT平台的新手。我需要阅读使用Python的串行端口RS232以9600波特率(设备名称:Sunrom血压传感器)读取血压和心率并输出。请帮助我提供任何有用的参考链接和有用的材料。

jacky598 回答:如何使用Raspberry Pi3读取SunRom血压传感器数据

三个步骤的快速指南:

1)在Rpi上的UART上禁用内核消息:运行sudo raspi-config,在菜单上选择选项5(接口选项),然后选择P6(串行),然后选择否。有关此{{3}的更多详细信息}。

2)将传感器连接到RPi的UART:根据here,传感器上的UART工作在3.3V电平,因此将其直接连接到Pi的UART应该是安全的。进行以下连接:

|Sensor |  RPi connector      | 
|=============================|
| +5V   |     2 or 4 (+5V)    |
|  GND  |     6 or 9 (GND)    |
| TX-OUT|     10 (UART0 RXD)  |     

3)启动您的Pi和传感器,并运行以下脚本(使用Python 3.x),改编自this link,仅删除打算写入端口的部分(您无需编写任何东西,您的传感器都会不断发送数据)并解码接收到的原始数据以正确显示它:

import serial,time
#initialization and open the port

#possible timeout values:
#    1. None: wait forever,block call
#    2. 0: non-blocking mode,return immediately
#    3. x,x is bigger than 0,float allowed,timeout block call

ser = serial.Serial()
ser.port = "/dev/ttyS0"
ser.baudrate = 9600
ser.bytesize = serial.EIGHTBITS #number of bits per bytes
ser.parity = serial.PARITY_NONE #set parity check: no parity
ser.stopbits = serial.STOPBITS_ONE #number of stop bits
#ser.timeout = None          #block read
ser.timeout = 1            #non-block read
ser.xonxoff = False     #disable software flow control
ser.rtscts = False     #disable hardware (RTS/CTS) flow control
ser.dsrdtr = False       #disable hardware (DSR/DTR) flow control


try:
    ser.open()

except Exception as e:
    print("error open serial port: " + str(e))
    exit()

if ser.isOpen():

    try:
       ser.flushInput() #flush input buffer,discarding all its contents
       ser.flushOutput()#flush output buffer,aborting current output 
                     #and discard all that is in buffer


       numOfLines = 0

       while True:
          response = ser.readline().decode()
          print("Blood Pressure [mmHg] (Systolic,Diastolic,Pulse): " + response)

          numOfLines = numOfLines + 1
          time.sleep(1)
          if (numOfLines >= 5):
              break

       ser.close()
    except Exception as e1:
       print("error communicating...: " + str(e1))

    else:
       print("cannot open serial port ")

免责声明:以上内容均未经过测试(连同传感器一起,我确实对代码进行了测试),但它应该立即起作用,或者至少为您提供入门指南。

本文链接:https://www.f2er.com/3074849.html

大家都在问