Low Power Water Detector Alarm Circuit and IoT with trigBoard (Immediate Push Notifications)
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- Опубликовано: 28 сен 2024
- Super simple water detector circuit here and has been tested now for a couple months - this was of course designed to be an IoT water leak notifier, but in the video I show you how to make just a simple alarm circuit.
Project page is here: trigboard-docs...
Tindie link to trigBoard: www.tindie.com...
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/ kdarrah
Twitter: / kdcircuits
For inquiries or design services:
www.kdcircuits...
Using the Schottky leakage current to pull down the Gate instead of using resistors is a brilliant idea! Going to keep that configuration in mind for some other projects. Great and inspiring video, as always..
Thank you Kevin! Very useful video! . Waiting for delivery of the Trigboard.
Appreciate this Kevin, very well documented. Might get a few trigboard sales out of me yet ;)
Interesting circuit Kevin! Altough a wide spread of variabeles might require some tuning when you duplicate the circuit. The resistance of the liquid is variable, the Vgs of the Mosfet has a wide spread. A think a high value trim potentiometer in stead of the diode should give you more flexibility. Neverteless a perfect application for the Trigboard!
Great 👍 job explaining the circuit schematic. Your a good man Charlie Brown.
Very interesting and efficient design. What about ESD protection? Having the input going directly to the gate of a MOSFET makes this must to consider.
good call - for my own uses I'm not too worried about it, but would be a good idea. Maybe I'll add the protection and post up on the docs - thanks for that!
Hi Kevin Thank you for an awesome simple circuit. I got a question hy at the first part you use 2 diodes and at the second part with the trigboard you only use half of it? Also how it can be applyed to Arduino or simple ESP without the trigboard?
Once again..great video...the diodes tricks is inspiring..
Curious as to which buzzer you used?
Great ingenuity !
Nice! would it be possible/feasible to have the trigboard power up / shutdown a mains powersupply somehow and use the battery only for wakeup?
yes, have the output drive a latching relay to kill power if water is detected. Needs to be latching, since the trigBoard can't control its IO while sleeping
Thanks for sharing!
Hi Kevin I have a question for you. How long of wire can I use from the trigBoard to sense water? My water lines run in my attic and I want to run a pair of wires along side the water lines and strip the wires bare at each water line elbow so I know if there is ever a leak. Would this sense a leak on a wire about 75 feet long? Thanks Dave.....
Does your "TrigBoard" has a "brown out" detection and warning, so you get informed BEFORE running out of juice? some sensors you want to have them up for years without change of batteries. but then how to get notified before its too late?
yes, there is a setting in the configurator to set a low bat threshold, then you get a notification when the battery is running low - very useful
Very impressive! Do you still offer design services? I submitted a contact request through your website. I could use your expertise on a project I’m working on.
yes I do and reading your email right now - thanks for reaching out!
30USD + Tax + international shipping to europe ?! Is not going to fly!! better bring it down to 5usd. thats more like it.
yea, small batch manufacturing in the USA is what it is
Thanks for both explanation. I've seen a lot a water level detectors which work on Darlington transistor like the ULN2003. Are they more power hungry circuits?
Very cool design. How would you go about adjusting the sensitivity of such a circuit -- say you want it to detect water but not someone touching it.
yea, you could change that diode out with a resistor, start with 1M then lower until you have the sensitivity you want.
really cool. i love your passion for low power circuits and systems! don't stop doing that! also, this design would be useful for folks to have in the drain pan for their a/c unit and the drain pan below the hot water heater. In fact, i think this could be a commercial product for that... something that clips on to the side of the standard drain pan and lets you position the sensor part (obviously can't let the pan conduct through the sensor) and has all the settings defaulted for the alerts and the low battery messages. great work!
How long can those probe wires be? Can I make a single circuit and then spread several security-system sort of cables from it around the house, terminating each with a stainless steel probe?
Excellent video. You could even use an adapted version of this with different levels of contacts in a container as well as an empty function to detect rain levels and note the rainfall on a daily basis which could then be used to set up an automatic watering system for the garden.
I am not completely sure as to why you used a diode. Does the diode have a lower current draw compared to a pull down resistor, also would a high value resistor have the same low current property as the diode?
yea, I also tested the circuit with 1M resistors and also worked fine. I did find the diode to be snappier though and create a more sensitive response... I might study this further, but the diodes just seemed like a cool way to stabilize the gates.
@@Kevindarrah cool, but probably less reliable as there might be more variance compared to even 5% resistor.
@@Kevindarrah You may have to look at the temperature dependency as well. See Figure 9. "Typical Reverse Current", although curves are not drawn for 0V, in datasheet 1N5817. Looks like the leakage current varies much when it gets hot. I don't know if it matters ... in this case.
Simplicity is beauty, magic!
Hey, you asked to comment how you spell Solder, and it wanted to comment "SODDER! - Love you anyways" on your newest video (How to solder surface mount parts ..), but it's gone!? .. :-/ Regarding the desoldering, try with "sn42 bi58 wire" (Low temperature solder) - it will mix with the existing solder and allows desoldering at "low temps" (180 degrees celsius == 360 degrees fahrenheit).
oh yea, thanks! yea, I started to feel like that video was not complete without also showing better techniques - I may revisit that one
Haven’t you had any problem with corrosion on the VBAT contact of the water sensor? How long have you had this running for? And how long in actual water?
the leak sensors really haven't been exposed to water much, but I just tested them after months of sitting... all good. The rain sensor sat outside for a couple months, went through rain over and over again. All good. Originally when I used copper tape, that corroded and failed after just a week.
@@Kevindarrah that sounds promising. What kind metal is used for the probes?
ok this is probably obvious but why 2 p-channel MOSFETs and not 1 n-channel?
this could possibly work for the standalone alarm circuit, but not with the trigBoard input. That input senses voltage, so needs to be either there or not, hence the use of a single P-CH but I did try N-CH as well as many other circuits - this P-CH concept worked perfectly with the least amount of components and held onto the low power performance regardless if triggered or not.
Ingenious, very creative