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Now to persuade my tablet PC to take it as a stream
Very handy little modules. It seems that the LED is controlled by GPIO4. A bit of reading produced this:
"If you’re not using the microSD card, you can use these pins as regular inputs/outputs. You can take a look at the ESP32 pinout guide to see the features of these pins.
All these GPIOs are RTC and support ADC: GPIOs 2, 4, 12, 13, 14, and 15."
So it seems that adding a few lines of code to 'toggle' GPIO4 or even to use an ADC and set a threshold either in SW or via a potentiometer/LDR could be quite possible.
I've written basic for picaxe and loosely understand Arduino so something for a rainy day perhaps.
A very grateful Gareth