How to properly count 'pulses'

@devilkin wrote:

I’ve got a reflective sensor on an arduino nano (with serial-usb) that gives me a pulse (basically an X) over serial input every time it’s triggered.

This is linked to a sensor as

sensor:
  - platform: serial
    serial_port: /dev/serial/by-id/usb-1a86_USB2.0-Serial-if00-port0
    baud_rate: 115200

Now, I get the things into HA … but how do i properly count this stuff?

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