Anyway to detect if DLight-HAT is plugged in? Very slow to just check.

[konacurrents]

I've been using the DLight-HAT with my M5 very nicely. I also have a motion PIR sensor. I'm using these
to turn on my Christmas lights with the M5Socket (via MQTT messages).

My issue is when the DLight-HAT is NOT plugged in, the call to get the LUX is very slow, and breaks
my event loops (especially the button press of the M5).

#include <M5_DLight.h>
//! the sensor object for the DLight
   M5_DLight _M5DLightSensor;

    uint16_t lux = _M5DLightSensor.getLUX();

With this HAT (or UNIT) and others, is there way to query whether it's plugged in?
The Wire.h has an available call but it didn't provide anything valuable.

With the plug-n-play aspect of these HATs, I was hoping not to have code that is
configured (at runtime) whether the HAT is plugged in.

NOTE: when the PIR motion sensor isn't plugged in, it is still fast.

[Xorlent]

This could be fragile in certain circumstances, but it has worked well for me. Check for a returned value > 54500

Edit: Taking a look at the sensor's capabilities, I believe this code change allows for detection of the device when you call begin(). I have tested on my specific hardware, but if you would like to test on your hardware, it would be appreciated.

You will want to uninstall the M5-DLight Arduino library and place M5_DLight.h and M5_DLight.cpp from the repo below into the same directory as your sketch:

Repo:
https://github.com/Xorlent/M5-DLight

Example sketch:

#include "M5_DLight.h"

M5_DLight sensor;

void setup() {
    Serial.begin(115200);
    delay(3000);

    Serial.println("DLight presence detection");

    if (sensor.begin(&Wire, 2, 1)) { // Adjust SDA, SCL based on your needs
        Serial.println("DLight detected");
    } else {
        Serial.println("DLight not detected");
    }
}

void loop() {
    delay(1000);
}

[Xorlent]

@TinyuZhao do you see this as a worthwhile feature to add so a sketch can easily detect the presence of the module on .begin()? If so, I can create a PR, but I would need someone's help testing the examples for hardware I do not have access to.

[TinyuZhao]

@Xorlent I think this feature is pretty good. I hope you can submit a PR; I'll review it.