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Science of a Wet Night


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On 8/4/2017 at 4:51 AM, TheIrreverend said:

Since I've consistently wet the bed for the past months, I was inspired to build a sensor that would record when and how much I wet during the night, just out of curiosity.

I used my Arduino and the temperature sensor from my circuits lab kit to do this. By waterproofing the sensor and putting it inside my protection, I could record the temperature change from my wetting and see how long it lasted. From this, I could calculate the volume of the wetting by multiplying the average bladder emptying rate for females (18ml/s) by the time.

(etc.)

Great topic, and what a GREAT research! It was performed with all the thoroughness and mind of real boffin. I am absolutely sure that this experiment may be valuable and informative for clinical specialists researching enuresis.

Dear TheIrreverend, you are a very talented person. Congratulations ?

P.S.: In my teenager years, I went through something like that testin urological hospital. There were four of us in a chamber. We were wearing some device to bed - a kind of bedwetting alarm with a wire to pants but working through a low electric impulse instead of a buzzer so when one of us began to urinate and was awakened, the rest can keep on sleeping. The awakened one get up and urinates in a mensural bottle under his bed, then changed his pants, wiped a device clip and went to sleep again. This device also has a timer that sends a signal to a display to a night nurse who fixed a time of wettings in a register. As I know, at that time this device was the most effective non-medicamentous method of bedwetting treatment.

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Since I've consistently wet the bed for the past months, I was inspired to build a sensor that would record when and how much I wet during the night, just out of curiosity. I used my Arduino and

To help calibrate your volume measurements, you could take the actual weight of the diaper dry, and then wet, and use the weight of water to see how close your volume calculation based on that assumed

It would be interesting to pair this data with one of those phone apps that track your sleep cycles - figure out during which cycle the wetting is happening.  If it's happening during REM, for example

Irreverend,

Good that the project continues in the background.  I've worked in environments where engineers and applications scientists return from vacations and write madly in their notebooks.  They were not working during their vacations.  But getting away from a project freshens perspective.

A means of keeping a thermistor where it needs to be on a male still eludes me.  (That is to say a simple, inexpensive and non-distracting means.)

Cheers

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Good morning!

I dug out my old sensor last night and wore it to bed. I wet twice, once about 2h after falling asleep for 349ml, and once about 45 minutes before I woke up for the second time this morning. I woke up at about 5am because I was extremely thirsty, so I sat up in bed and gulped down water from the bottle I keep at my bedside. My second wetting was much larger than the first, and the sensor registered a wetting lasting 87s, but I think that was because I dribbled and spurted for a bit before I finally let go and peed into my diaper, not because I somehow held 1500ml before letting go. I'll definitely try to find a way to fit the new sensor with a way the differentiate slow and fast wettings.

As for my dreams, I remember being on a train racing through a snowy forest somewhere in Russia, or maybe Eastern Europe, because the signs were all in Cyrillic letters.

One of the other passengers had been murdered, and everyone thought I did it, so I had to try and prove who it really was, but I had a really hard time because the ghost of the murdered guy was following me around and making constant sarcastic commentary on everything I did.

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Do you write fiction or scrips?  Your dream has better plot coherence than things we used when I worked in Independent television.  But that was long ago.

After TV I mostly worked as an engineer's technician.  That involved testing "signal conditioning subsystems" containing Wheatstone bridges, differential amplifiers, instrumentation amplifies, active low-pass filters and bridge-type notch (60-hz reject) filters.  Presumably, your system does not require all that between the sensor and the Arduino.  However, trying a 44,000-ohm at room temperature thermistor into a high-impedance voltmeter gave 3:1 errors from fields picked up by my body.  Using it into a differential amplifier followed by an active low-pass filter should correct.  If you're not this deep into the analog side, don't worry. 

For lurkers wondering what language I'm writing in, I'd intended to reference active filters built around operational amplifiers.  At least for Arduino, digital filters have almost completely replaced active filters.  Searching on Arduino digital filters brings up many, many free download hits.  These require no added parts and no soldering.  Things requiring soldering:

Wheatstone bridge

http://home.wlu.edu/~ericksonj/circuits_f2018/labs/WheatstoneBridge_f2018.pdf

https://masteringelectronicsdesign.com/measure-a-wheatstone-bridge-sensor-signal-with-an-adc/

differential amplifier

https://electronics.stackexchange.com/questions/284055/operational-amplifier-circuit-signal-to-0-5-v

https://electronics.stackexchange.com/questions/45682/simple-op-amp-differential-amplifier

Instrumentation amplifier

http://www.skillbank.co.uk/arduino/measure3.htm

https://www.edn.com/design/analog/4322833/The-right-way-to-use-instrumentation-amplifiers

Active filter.  The engineers who kept me as a pet didn't use these unless needing an anti-aliasing (pre-sampling) filter.  Some used only the Nyquest rule (regularly producing 20% errors from ignoring details).  Others applied 600-page volumes on the Shannon's fine points (usually good to 1%, but when producing design errors, producing enormous errors due to arithmetic slips).

https://circuitdigest.com/tutorial/active-low-pass-filter

https://hackaday.com/2017/03/08/dont-fear-the-filter-lowpass-edition/

 

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I didn't wear my sensor last night, since I'd been out with friends to finally celebrate the end of exams. I had two rum and cokes and about three pints of water over the course of a few hours, and I got home at about 1am completely exhausted. I clumsily stripped off all my clothes and taped on a diaper, and then flopped face down onto my bed. I woke up at about noon, still in the same position, but with the front of my diaper entirely saturated up to the waistband and the sheets wet from my stomach to the middle of my thighs. I don't know if I leaked because of the amount I drank, the fact I didn't go pee before falling into bed, my taping up my diaper really sloppily, or all three.

The only thing I could remember from my dreams is that I borrowed a laptop from my friend and I cracked the screen by shutting it with my earbuds inside, and I was so afraid of her finding out I had to hide from her all the time.

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