Ultrasonic sensor question

[msev]

For the HC-SR04 ultrasonic sensor - would it be possible to make an option in the code, that the ESP would send a MQTT message 1 if object besides the sensor was present (for example car in a garage) and 0 if the object wasn't present.

So basically send MQTT message 1 (or something else) if object is present and 0 if object is not present within the range of the sensor.

[chrille]

For the HC-SR04 ultrasonic sensor - would it be possible to make an option in the code, that the ESP would send a MQTT message 1 if object besides the sensor was present (for example car in a garage) and 0 if the object wasn't present.

So basically send MQTT message 1 (or something else) if object is present and 0 if object is not present within the range of the sensor.

This is really a job for an external application, like nodered or mqttwarn. If you use some kind of home automation system, it might also be able to it, but it's trivial to implement in mqttwarn, and it's only a matter of time, before you need to other things with your MQTT messages

- Jan

[msev]

Well dunno, I think it could be used that way too...It could be an option, since probably the main use case of an ultrasonic sensor would be detection of an object infront of it .

But I would still like to know how you would do it in mqttwarn, it looks interesting , can you explain a bit more on the specifics. Also do you use any dashboard for your sensors, if so which one?

[Martinus]

For the HC-SR04 ultrasonic sensor - would it be possible to make an option in the code, that the ESP would send a MQTT message 1 if object besides the sensor was present (for example car in a garage) and 0 if the object wasn't present.

So basically send MQTT message 1 (or something else) if object is present and 0 if object is not present within the range of the sensor.

I think that it should already work this way if you select "state" mode in the settings and enter some threshold. Check the wiki page settings.

[msev]

Awesome, gonna try that...By the looks of the wiki it should work