Operate a switch with hysteresis (python)

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By purpose
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Release date:2024/12/9　　　　　　　　　

・In Japanese

■Description
Operates a switch with hysteresis.

■Example
Below is the hysteresis switch.

flag = 0

if a > 0.5 : flag = 1
elif flag==1 and a > -0.5 : flag = 1
else : flag = 0

I added a program section to check the operation.

import numpy as np
import matplotlib.pyplot as plt
import math

flag = 0
sin_value = []
flag_value = []

for n in np.arange(0,7,0.01):
    a = math.sin(n)

    if    a > 0.5                     : flag = 1
    elif flag==1 and a > -0.5 : flag = 1
    else                                : flag = 0

    sin_value.append(a) #Graph drawing data storage
    flag_value.append(flag) #Graph drawing data storage

#Graph drawing
fig = plt.figure()

plt.subplot(2,1,1)
plt.plot(np.arange(0,7,0.01) , sin_value)

plt.subplot(2,1,2)
plt.plot(np.arange(0,7,0.01) , flag_value)

plt.show()

The results are as follows.

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