DevHeads IoT Integration Server•6mo ago

I need to monitor hall sensors for position encoding with up to 350 changes per second.

Alright guys, I need to monitor hall sensors for position encoding with up to 350 changes per second. My current Python program watches GPIO pins but uses too much CPU. Here's my polling loop:

REFRESH_RATE = .0005

while True:
    new_p1_state = GPIO.input(hall_p1)
    new_p2_state = GPIO.input(hall_p2)

    if new_p1_state != p1_state or new_p2_state != p2_state:
        if p1_state == GPIO.HIGH:
            if new_p2_state == GPIO.HIGH:
                position -= 1
            else:
                position += 1
        else:
            if new_p2_state == GPIO.LOW:
                position -= 1
            else:
                position += 1

        p1_state = new_p1_state
        p2_state = new_p2_state

    time.sleep(REFRESH_RATE)

REFRESH_RATE = .0005

while True:
    new_p1_state = GPIO.input(hall_p1)
    new_p2_state = GPIO.input(hall_p2)

    if new_p1_state != p1_state or new_p2_state != p2_state:
        if p1_state == GPIO.HIGH:
            if new_p2_state == GPIO.HIGH:
                position -= 1
            else:
                position += 1
        else:
            if new_p2_state == GPIO.LOW:
                position -= 1
            else:
                position += 1

        p1_state = new_p1_state
        p2_state = new_p2_state

    time.sleep(REFRESH_RATE)

How can I make this more efficient? Should I use a different language or tool? If so, which one? @Middleware & OS

Solution:

@Sterling Your program keeps checking the sensors, wasting power. Try letting the sensors interrupt the program only when they change, or use a separate task to handle them. C/C++ might be faster than Python for this job.

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2 Replies

Solution

Dtynin•6mo ago

Sterling•6mo ago

So I guess it's more so that using python is the cause ? @Dtynin

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I need to monitor hall sensors for position encoding with up to 350 changes per second.