Hi there [Sorry, I’m not electronically minded], I’d like to use the LLC200D3SH-LLPK1 sensor in an application where I want a ‘high’ output when the sensor is wet and a 0V output when dry (opposite to the sensor’s direct output). Is there a way of achieving this without using a controller like an Arduino and maintain a ‘high’ output close to 12V rather than 5V from an Arduino. I would be using it to trigger a small 12V automotive relay.
Hi Taj
Invert the signal with a transistor or OP amp.
Cheers Bob
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An Opamp can invert and level shift at the same time.
Rob
Hi Rob
So can a transistor
Cheers Bob
Yeah I know, I’m 98% a digital person though and struggle with opamps let alone using a transistor in an analog linear mode. I prefer to have a millions of them packed inside an MCU 
Took all the fun out of it when they started to do that.
Cheers Bob
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Truer words have never been spoken, the hand sanitizer project Aisha posted about pointed out a hole in my knowledge re: the basics of electronics; transistors, FET’s, OP amps, 555’s, its too easy to throw a microcontroller at something these days and have it do everything you need…and more (slowing the project down, costing an extra $$$ and for mission critical projects, opening up safety flaws)
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Hi Liam
Not a bad idea to go back beyond that too.
Like Ohms law, Volt, Amp Resistance relationship and throw Power into the mix for good measure. Also Mr Kirschoff had a couple of useful things to say too. One little choice bit that really pertains to OP amp input behaviour says that the sum of all the currents into and out of a junction equals zero.
With all the digital hoo hah the whole thing would be quite useless without Analog techniques. For instance to transport digital information between A and B over any appreciable distance the medium must be analog. That is Modem and Radio mainly. A bit of marketing floating around about digital radio. Believe me there is NO such beast. The modulation information may be digital (digital TV) but the transport medium is analog (radio).
Even within digital systems, with clock speeds getting well up into the GHz ranges the tracks on a decent size motherboard could be a couple of wavelengths or more long and are transmission lines and have to be treated accordingly, analog techniques come into play re matching impedances etc.
See we all play our part.
Cheers Bob
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