如何改变我的wxpython程序读取和显示雨水传感器数据从mcp3008软件spi

Question

我有一个完整的wxpython代码，可以从雨传感器读取数据，并将其从模拟转换为数字与mcp3008。问题是我目前使用的树莓派，已经有一个20x4液晶显示器，使用引脚24或GPIO 8，我需要我的雨水传感器程序。我已经从https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters/mcp3008#software-spi上阅读了如何将我的spi连接更改为软件spi。这是我的mcp3008引脚到树莓派没有液晶显示器:MCP3008 VDD -> 5V

MCP3008 VREF -> 5V

MCP3008 AGND -> GND

MCP3008 CLK ->引脚23

MCP3008 DOUT ->引脚21

MCP3008 DIN ->引脚19

MCP3008 CS ->引脚24

MCP3008 DGND -> GND

这是我的wxpython代码雨传感器:

import datetime
import spidev
from time import sleep
import os
spi = spidev.SpiDev()
spi.open(0,0)
#global adcOut
adcOut = 0
percent = 0
volts = 0
rain_condition = ""
global current_time
current_time = datetime.datetime.strftime(datetime.datetime.now(), '%d-%m-%y   %H:%M:%S')
try:
    import wx
except ImportError:
    raise ImportError, "The wxPython module is required to run this program."
class RainSensorApp_wx(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, id, size = (700, 300))
        self.SetBackgroundColour(wx.WHITE)
        self.parent = parent
        self.initialize()
    def initialize(self):
        sizer = wx.GridBagSizer()
        font = wx.Font(20, wx.DECORATIVE, wx.ITALIC, wx.NORMAL)
        self.SetFont(font)
        self.label1 = wx.StaticText(self, -1, label = u'Rain Sensor Level: {0:4d}   Percentage: {1:3}%   Voltage: {2}V'.format(adcOut, percent, volts))
        self.label1.SetBackgroundColour(wx.WHITE)
        self.label1.SetForegroundColour(wx.BLACK)
        sizer.Add(self.label1, (1,0), (1,2), wx.EXPAND)
        self.label2 = wx.StaticText(self, -1, label = u'Rain Condition: {}'.format(rain_condition))
        self.label2.SetBackgroundColour(wx.WHITE)
        self.label2.SetForegroundColour(wx.BLACK)
        sizer.Add(self.label2, (2,0), (1,3), wx.EXPAND)
        self.label3 = wx.StaticText(self, -1, label = u'Time Updated: {}'.format(current_time))
        self.label3.SetBackgroundColour(wx.WHITE)
        self.label3.SetForegroundColour(wx.BLACK)
        sizer.Add(self.label3, (3,0), (1,4), wx.EXPAND)
        self.timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.on_timer, self.timer)
        self.timer.Start(1000)
        self.SetSizer(sizer)
        self.Show(True)
    def on_timer(self,event):
        channel = 0
        if ((channel>7) or (channel<0)):
            return -1
        #r = spi.xfer2([1, (8+channel) << 4, 0])
        #REPLACEMENT
        r = [0]*8
        for i in range(8):
        # The read_adc function will get the value of the specified channel (0-7).
            r[i] = mcp.read_adc(i) 
        #END REPLACEMENT
        adcOut = ((r[1]&3) << 8) + r[2]
        #global adcOut
        percent = int(round(adcOut/10.24))
        volts = ((adcOut/float (1023)) * 5)
        volts = round(volts, 2)
        global current_time
        current_time = datetime.datetime.strftime(datetime.datetime.now(), '%d-%m-%y   %H:%M:%S')
        if adcOut >= 0 and adcOut <= 300:
            self.label1.SetLabel("ADC Output: {0:4d}   Percentage: {1:3}%   Voltage: {2}V".format(adcOut, percent, volts))
            self.label2.SetLabel("Rain Condition: Heavy Rain")
            self.label3.SetLabel("Time Updated: {}".format(current_time))
        elif adcOut >= 0 and adcOut <= 500:
            self.label1.SetLabel("ADC Output: {0:4d}   Percentage: {1:3}%   Voltage: {2}V".format(adcOut, percent, volts))
            self.label2.SetLabel("Rain Condition: Moderate Rain")
            self.label3.SetLabel("Time Updated: {}".format(current_time))
        elif adcOut >= 0 and adcOut <= 700:
            self.label1.SetLabel("ADC Output: {0:4d}   Percentage: {1:3}%   Voltage: {2}V".format(adcOut, percent, volts))
            self.label2.SetLabel("Rain Condition: Light Rain")
            self.label3.SetLabel("Time Updated: {}".format(current_time))
        else:
            self.label1.SetLabel("ADC Output: {0:4d}   Percentage: {1:3}%   Voltage: {2}V".format(adcOut, percent, volts))
            self.label2.SetLabel("Rain Condition: No Rain")
            self.label3.SetLabel("Time Updated: {}".format(current_time))
if __name__ == "__main__":
    Rs = wx.App()
    RainSensorApp_wx(None, -1, 'Rain Sensor Monitor')
    Rs.MainLoop()

下面是AdaFruit_MCP3008的示例代码，我按照web上给出的步骤安装库:

# Simple example of reading the MCP3008 analog input channels and printing
# them all out.
# Author: Tony DiCola
# License: Public Domain
import time
# Import SPI library (for hardware SPI) and MCP3008 library.
import Adafruit_GPIO.SPI as SPI
import Adafruit_MCP3008

# Software SPI configuration:
CLK  = 18
MISO = 23
MOSI = 24
CS   = 25
mcp = Adafruit_MCP3008.MCP3008(clk=CLK, cs=CS, miso=MISO, mosi=MOSI)
# Hardware SPI configuration:
# SPI_PORT   = 0
# SPI_DEVICE = 0
# mcp = Adafruit_MCP3008.MCP3008(spi=SPI.SpiDev(SPI_PORT, SPI_DEVICE))

print('Reading MCP3008 values, press Ctrl-C to quit...')
# Print nice channel column headers.
print('| {0:>4} | {1:>4} | {2:>4} | {3:>4} | {4:>4} | {5:>4} | {6:>4} |     {7:>4} |'.format(*range(8)))
print('-' * 57)
# Main program loop.
while True:
    # Read all the ADC channel values in a list.
    values = [0]*8
    for i in range(8):
        # The read_adc function will get the value of the specified channel (0-7).
        values[i] = mcp.read_adc(i)
    # Print the ADC values.
    print('| {0:>4} | {1:>4} | {2:>4} | {3:>4} | {4:>4} | {5:>4} | {6:>4} | {7:>4} |'.format(*values))
    # Pause for half a second.
    time.sleep(0.5)

有人可以帮助我如何改变我的程序读取数据与软件spi，因为我需要改变软件spi配置为:

CLK = 23

MISO = 21

MOSI = 19

CS = 29

Answer 1

在不知道Adafruit_MCP3008返回什么并且无法访问硬件以能够测试它的情况下，我怀疑您现有的行:

r = spi.xfer2([1, (8+channel) << 4, 0])

应替换为:

r = [0]*8
for i in range(8):
    # The read_adc function will get the value of the specified channel (0-7).
    r[i] = mcp.read_adc(i) 

唯一确定的方法是打印出当前设置中的r，然后对新设置执行相同操作，以查看是否有任何差异以及它们是什么。