How to make a "Heat map" with Node Red

Configuration
1

I wanted a “heat map” to show the activity of my PIRs (passive infrared detectors).

For each PIR, I set up an input_select with five options in my configuration.yaml

  0_office_pir:
    options:
      - Level-1
      - Level-2
      - Level-3
      - Level-4
      - Level-5
    initial: Level-1

I created different .pngs for each option:

  • Level 5 Bright green when the PIR was triggered in the last 30 seconds.
  • Level 4 (reserved)
  • Level 3 Blue when triggered between 30 seconds and 60 seconds ago.
  • Level 2 Gray when triggered between 1 and 5 minutes ago.
  • Level 1 Faint gray

My Lovelace looks like this:

          - type: picture-elements
            title: Terrace
            aspect_ratio: 1:1.74
            image: /local/Floorplan0.png
            elements:
              - type: image
                entity: input_select.0_patio_pir
                state_image:
                  'Level-1': /local/PIR01.png
                  'Level-2': /local/PIR02.png
                  'Level-3': /local/PIR03.png
                  'Level-5': /local/PIR05.png
                style:
                  top: 16%
                  left: 33%
                  transform: rotate(1deg)

In Node Red (where I’m already monitoring my PIRs for motion-sensitive lighting) my flow starts whenever my PIR is violated and triggers the following:

  • immediately set the value of my input_select to Level-5
  • wait 30 seconds, then set the input_select to Level-3
  • wait 60 seconds, then set the input_select to Level-2
  • wait 300 seconds, then set the input_select to Level-1

image

Works perfectly.

Cheers, Richard

2

Why do you want to violate your PIR’s?

1 Like
3

If you’re joking, I violate them because they like it.

If you’re not joking, violated is the term they send when they’ve been triggered.

4

Ok, english is not my first language, but because you asked if I joked :

violate

violate something (formal) to go against or refuse to obey a law, an agreement, etc.
violate something to damage or destroy a holy or special place
violate somebody (literary or old-fashioned) to force somebody to have sex

None seemed appropriate to PIR’s.

5

My PIRs are attached to an alarm system. In that context, “violated” means someone, possibly an intruder, has entered your space. Cheers.