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I will Teach you how to make a simple water sensor circuit
Parts List1 General Purpose NPN Transistor $0.101 50K Trimpot $0.151 47ohm Resistor $0.011 LED $0.081 Proto Board or You can etch A PCB1 3 volt power...
Read Circuit Diagram
The Schematic is made with ExpressPCB which is a free PCB Layout Software you can download it here Than Download the PCB file and open and print it an...
Build time will update once I make the PCB
Here are some mock ups of how to connect it to a HHO Cell or just detect water.
Here is how to setup the circuit to run on 12 volts from a car battery the circuit is still the same just some resistors are added to the probes to p...
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I put a dpdt 12vdc relay in place of the LED. Now I can control the water level on my model steam boiler.
It was a pain though. The documentation I had on the transisistor had me wire it backwards. Also, the power supply I was using was way too noisy. After taking the battery out of my classic car, it worked.
FYI: Don't use an autmotive battery charger as a steady power supply.
Just wondering how I could make a very simple sensor to detect when something is no longer in water. So when the water sensor is no longer active it will alarm with a small speaker/beeper. I want to make something to put in a float used for crab pots so if a would be thief attempts to remove it the speaker is activated. Hopefully something low voltage. This would be in salt water if that makes any difference
It is simple and very effective! Note that the circuit response will vary depending on the medium such as fresh water, lake water, salt water, etc.
Thanks....the video saved me from pulling my hair out. Was not aware in re: tying the pot half to ground. I intend to use this as an auto switch on my bilge pump. I intend to add a three way switch, Off, Auto, Manual. I assume I will need to amp up the output to pull in a micro relay? If I am not mistaken the relay will require about 60 ua ....have not gotten it in yet to see. Any suggestions? Thanks for a great vid.
I could see replacing the LED with a relay most relays are designed to operate from low voltage sources and switch on or off a high voltage supply so just remove the LED and its resistor and put a relay in there place and I'm guessing this is for a boat so powering it should be easy with no changes to the circuit since boats use a 12v system the circuit was designed for 12v you just need a 12v relay that can handle the pump. Thank you for the comments and good luck.
well since you want a delay timer a 555 or 556 chip can be used and the sensor can also be built from it if you want I can design the circuit for you and all you will need to do is get the parts and build it just let me know if you want me to do it
Hi, did you post the circuit as described above (ie to prevent on/off/on) using 555 timer etc?
That would be great! Keep in mind that I am new to electronics (66 yrs old) so I do well with pictures :) I have plenty of 555 and 556's as well as ATTiny 13 and 85's as well. I have managed to struggle through burning the Tiny's with an Arduino ISP. I am thinking a delay off of about 45 sec, with the probes about 1/4 above the intake should give the pump enough time to drop the level well below the probes. Thanks for any help. BTW...the detector circuit works flawlessly but I would never have figured it out without your vid...which was outstanding.
Is this working?
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