Wet and Dry Sensor Circuit in one (Basic)

In summary, the conversation discusses combining a simple wet sensor circuit and a dry sensor circuit into one circuit. The proposed solution involves using a two-input NAND circuit with diodes to drive a buzzer when both sensors give a signal simultaneously. This would allow the circuit to work when the wet sensor is wet and the dry sensor is dry. Additional details and clarifications are provided throughout the conversation.
  • #1
Hi, wondering how I could combine a simple wet sensor circuit and a dry sensor circuit into one?

The type of wet sensor I'm looking at is like this:
27yakio.jpg

and the dry sensor is the same except the sensor and variable resistor switch places.

How could I combine the two into one, so that the circuit works when:
1. The wet sensor is wet (touching water).
2. The dry sensor is dry.

-Thank you!
 
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  • #2
remove the buzzer lead from the transistor collector and wire directly to 0V
 
  • #3
i guess the more useful answer, if what you really want is two outputs, is to think of the http://en.wikipedia.org/wiki/Resistor%E2%80%93transistor_logic" [Broken]. might need some biasing resistors on the second stage. logically, it'd be like this:

7TypE.jpg


if that wasn't what you had in mind, then my guess is that you're wanting an analog circuit. yours appears to be digital, with the pot tuning it for a desired conductivity across the strips.
 
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  • #4
Sorry I don't think I explained this very well.

What I want is to have one circuit which combines these two circuits: (one wet and one dry), so that there is a wet sensor and a dry sensor in the one circuit, and the circuit will work when the wet sensor is wet and the dry sensor is dry.
34i2res.jpg


I'm just not sure how to combine them into one.
 
  • #5
I think the question people are asking is

Do you want either the wet sensor or the dry sensor to operate your trigger

or

Do you want the trigger to only operate when both the wet sensor and the dry sensor give a signal simultaneously?
 
  • #6
is this homework?

i believe what you're asking for is basically replacing the two transistors with a two-input NAND circuit that drives one buzzer when sensor A is dry and sensor B is wet.
 
  • #7
[PLAIN]http://dl.dropbox.com/u/4222062/wet-dry.PNG [Broken]

I think this would work.

If either diode d1 or d2 has its cathode pulled low, then the transistor will not get base current so it will stay off. If they are both high (meaning the dry sensor is dry and the wet sensor is wet) then the transistor will turn on and sound the buzzer.
 
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  • #8
Thanks very much for the replies :) Very helpful.

And yes I want them to work when both the wet sensor and the dry sensor give a signal simultaneously. :)
 

1. What is a wet and dry sensor circuit?

A wet and dry sensor circuit is a type of electronic circuit that is designed to detect the presence of moisture or water. It utilizes sensors that can measure changes in electrical conductivity, capacitance, or resistance in order to determine if an area is wet or dry.

2. How does a wet and dry sensor circuit work?

A wet and dry sensor circuit typically consists of two main components: a sensor and a control circuit. The sensor is responsible for detecting changes in moisture levels, while the control circuit processes the sensor's input and triggers an output signal when a certain threshold is reached.

3. What are the applications of a wet and dry sensor circuit?

A wet and dry sensor circuit has a variety of applications, such as in automatic irrigation systems, water level detectors, leak detection systems, and humidity control systems. It can also be used in household appliances, such as washing machines and dishwashers, to detect water levels.

4. Can a wet and dry sensor circuit be used in outdoor environments?

Yes, a wet and dry sensor circuit can be used in outdoor environments. However, it is important to choose sensors that are durable and weatherproof, and to properly seal the circuit to protect it from moisture and other elements.

5. Are wet and dry sensor circuits easy to install?

The ease of installation of a wet and dry sensor circuit depends on the complexity of the circuit and the specific application. Some circuits may require soldering or other technical skills, while others may be designed for easy plug-and-play installation. It is important to carefully read the instructions and follow proper safety procedures when installing any electronic circuit.

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