我使用树莓Pi创建一个简单的图形,显示通过GPIO引脚从电位计模拟读数。我创建了一个小电路,可以克服RPi无法读取模拟信号。绘图本身有一个小问题。我使用的代码如下所示。你知道吗
# include RPi libraries in to Python code
import RPi.GPIO as GPIO
import time
import matplotlib.pyplot as plt
from drawnow import drawnow
# instantiate GPIO as an object
GPIO.setmode(GPIO.BCM)
# define GPIO pins with variables a_pin and b_pin
a_pin = 18
b_pin = 23
gainF = []
gainString = 0
plt.ion()
x_axis = 0
def makeFig():
plt.ylim(200,210)
plt.xlim(0,100)
plt.title('Readings')
plt.grid(True)
plt.ylabel('Gain')
print(gainString)
print(x_axis)
plt.plot(gainString, x_axis)
plt.show()
#plt.plot(gainString, 'ro-', label='Gain dBm')
# create discharge function for reading capacitor data
def discharge():
GPIO.setup(a_pin, GPIO.IN)
GPIO.setup(b_pin, GPIO.OUT)
GPIO.output(b_pin, False)
time.sleep(0.005)
# create time function for capturing analog count value
def charge_time():
GPIO.setup(b_pin, GPIO.IN)
GPIO.setup(a_pin, GPIO.OUT)
count = 0
GPIO.output(a_pin, True)
while not GPIO.input(b_pin):
count = count +1
return count
# create analog read function for reading charging and discharging data
def analog_read():
discharge()
return charge_time()
# provide a loop to display analog data count value on the screen
while True:
print(analog_read())
gainString = analog_read()
x_axis = x_axis + 1
#dataArray = gainString.split(',')
#gain = float(dataArray[0])
#gainF.append(gain)
makeFig()
plt.pause(.000001)
time.sleep(1)
#GPIO.cleanup()
此代码显示makeFig()函数中不断增加的x轴和y轴读数,但打开的图形不显示任何内容。它保持不变。我需要修改密码吗?谢谢。你知道吗
您正在尝试绘制单个值的折线图。这和
因为一条线至少需要两个点才能成为一条线。你知道吗
你可以用一个标记来显示单个点,以防这是你要找的
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