HC-SR04 default value for over max distance

[waspie]

I've been banging my head against a wall trying to get 2 US sensors working right. I have second esp running with 2 and it's been fine but i made another with 2 more US sensors in a different position and I cannot get solid readings from them.

But I think I finally figured it out. Most of the time these 2 sensors will not pick anything up. In other words, they'll be trying to measure a distance that is beyond 400CM.
When they're in this state I get some crazy numbers out of them like:
547285 : SR04 : Distance: 9435517.00
or it says something else..unknown distance or something. I can't remember right now.

Is there a way to report the distance as out of bounds (like 1000 or 0 or something) when there is nothing within range?

[grovkillen]

With rules and dummy device you can do this.

[toffel969]

With rules and dummy device you can do this.

Yes I am using that exactly, works perfectly

You check the value for "sanity", then you write it into a dummy device. Further reactions only when the dummy is rewritten.

Code: Select all

On dist#scr4<400  do 
Taskvalueset,7,1,[dist#scr4]
Taskrun,7
Endon

On distance#dummy do
whatever
Endon