Milliseconds tiner

1

Hi guys,

I’m trying to get the time in milliseconds for when a binary digital sensor is on FALSE.
O know there is a tine delta functions but it returns 2 decimals instead of 3 and I need it to be a bit mor accurate.
How can I do this?

2

pulse-in might be the node you are looking for. It exists in robertspark/components — XOD

3

I tried it earlier, it doesn’t work.
Will try again and post a screenshot here a bit later.

4

How did you determine the resolution of the time delta functions? I doubt anything in Arduino returning a floating point number only has 2-digit resolution. Are you sure you were not using a display function that was defaulting to 2 decimal place display and rounding what you were seeing?

5

I’m trying again now, trying to het the time in debug mode instead of my lcd but without any success.
The sensors I’m using is a light barrier made of a “flame sensor” (ir receiver with a comparator included, has both digital and analog outputs) and an ir led.
If I’m using time delta it works but resolution is not big enough, with pulse-in doesn’t work at all.

image
image1920×1440 203 KB

6

Sorry maybe I’m not correct, when I say resolution I’m talking about the number of decimals after the point.

7

Watch nodes are only going to show 2 decimal points regardless of the number being displayed (0.123 is going to display as 0.12)

image

Format-number node will allow you to change the default behavior
image

8

The flame sensors I’ve seen are not sending a pulse, they send a voltage. Yours might be different, but normally you would just use an analog-read of the port it is connected to. In XOD, that will return a number between 0 & 1 (which would be the equivalent of 0-1024 in Arduino IDE). The closer to 0, the more intense (or closer) the flame.

9

I think this does something similar to what you’re looking for?

Example of using microsecond timer with button trigger:

image
image702×679 39.7 KB

example-microsecond-timer.xodball (16.4 KB)

10

Indeed but it’s outputting a string.
Nevertheless, is I take the value from delta time and put it into a calculation, how many decimals are involved in the actual arithmetical operation?

Regarding the flame sensor, this is the one I have and it has both analogic and digital outputs because it’s having the internal comparator which is comparing the analog value with a value you set up using the potentiometer (sensitivity).
It’s very versatile in this configuration because I can easily inceease or decrease sensitivity to reduce the effect of ambient light.

11

I’m not sure the exact true precision, but the node inside I made to go from microseconds to milliseconds used float


node {
    void evaluate(Context ctx) {
        float micros = getValue<input_IN>(ctx);
        emitValue<output_OUT>(ctx, micros / 1000 );
    }
}

The decimals of milliseconds are correct to at least 3 decimal places, since it’s derived from microseconds. I can’t think of a way to get more than 3 decimals after milliseconds.

As far as the output… It’s a number… The string you see is XOD processing through a “Watch” node, which helps you see what’s going on during Debug Mode. Output is a number - should be of type “float”.

12

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.