按特定顺序触发 PIR 传感器

发布于 2025-01-18 21:32:51 字数 491 浏览 1 评论 0原文

在我的设计中，我有两个连接到 Raspberry Pi 的 PIR 传感器，一个用于门口的两侧。

我需要帮助，了解一旦传感器按特定顺序触发，我该如何做某事。

为了简单起见，我们将传感器称为 A 和 B。

由于它们将用于房间计数，我希望当它们按顺序 AB 触发时计数增加，当按顺序 BA 触发时计数减少。

我之前尝试过这段代码，但失败了（我知道这里没有实现 roomCount，但我正在测试预期的输出）：

While True:
    if GPIO.input(pir1):
        if GPIO.input(pir2):
            print(“AB”)
   
    if GPIO.input(pir2):
        if GPIO.input(pir1):
            print(“BA”)

无论触发哪个顺序，这段代码都会不断给出输出“AB”。

任何有关此问题的帮助将不胜感激。

原文

I have two PIR Sensors connected to a Raspberry Pi one used for either side of a doorway in my design.

I am needing help on how I can do something once the sensors are triggered in a particular order.

Lets call the sensors for simplicity A and B.

Since they will be used for room count I would like the count to increase when they are triggered in order AB and decrease when triggered in order BA.

I have tried this code earlier but it failed (I understand there is no roomCount implemented here but I was testing for expected output):

While True:
    if GPIO.input(pir1):
        if GPIO.input(pir2):
            print(“AB”)
   
    if GPIO.input(pir2):
        if GPIO.input(pir1):
            print(“BA”)

This code was constantly giving the output “AB” no matter which order they were triggered.

Any help on this issue would be appreciated.

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╰◇生如夏花灿烂 2025-01-25 21:32:52

您可以尝试这样的事情：

condition = "" #create empty string
counter=0      #create counter :)
while True:
    if GPIO.input(pir1):
        condition+="A" #add char to it
    if GPIO.input(pir2):
        condition+="B" #add another char to it
    if "AB" in condition:
        counter += 1
        condition="" #reset the string
    elif "BA" in condition:
        counter -= 1
        condition="" #reset the string

希望会有所帮助。

You can try something like this:

condition = "" #create empty string
counter=0      #create counter :)
while True:
    if GPIO.input(pir1):
        condition+="A" #add char to it
    if GPIO.input(pir2):
        condition+="B" #add another char to it
    if "AB" in condition:
        counter += 1
        condition="" #reset the string
    elif "BA" in condition:
        counter -= 1
        condition="" #reset the string

Hope that helps.

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若水微香 2025-01-25 21:32:51

我认为您可能会做得更好，更像是这样的伪代码：

import time

maxWait = 2 #  Longest time (in seconds) to wait for other PIR to trigger

while True:
    if A is triggered:
        endTime = time.time() + maxWait
        while time.time() < endTime:
             if B is triggered:
                  print("AB")
                  # Sleep till the person has fully passed both sensors
                  while A is triggered or B is triggered:
                     sleep(0.1)

    if B is triggered:
        endTime = time.time() + maxWait
        while time.time() < endTime:
             if A is triggered:
                  print("BA")
                  while A is triggered or B is triggered:
                     sleep(0.1)

I think you might do better with code more like this pseudo-code:

import time

maxWait = 2 #  Longest time (in seconds) to wait for other PIR to trigger

while True:
    if A is triggered:
        endTime = time.time() + maxWait
        while time.time() < endTime:
             if B is triggered:
                  print("AB")
                  # Sleep till the person has fully passed both sensors
                  while A is triggered or B is triggered:
                     sleep(0.1)

    if B is triggered:
        endTime = time.time() + maxWait
        while time.time() < endTime:
             if A is triggered:
                  print("BA")
                  while A is triggered or B is triggered:
                     sleep(0.1)

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