Denes simpel water steam system .test under steam read under here
Just what i need..works great and easy..is possible to connect an LED through a resistor.
You can set the sensor to the minimum level of water on
your boiler, play with the boat on the water, and when the
LED switches ON you still have enough time to remove the
oat from the water to refill it. Or you can switch the
electric pump or the pump control servo by from your
radio transmitter, if the LED is 0FF you wait a couple of
seconds and you can switch the pump/pump control
servo OFF.
It has a water bouncing system, so the LED won't blinking
when the water goes up and down in the sight glass, or if
there is a moving water bubble
https://www.denesdesign.co.uk/product...