Hi ! I use a raspberry pi zero w, node-red, mosquito......as smart home system. Connected per wire are some DS18B20 temperature sensors, a sonic sensor in a well, normally closed switch in sewage pipe, some wireless ESP8266 sensors, solenoid valves...….and a "flying fish" sensor with an LM393 compa…

I'm no electronics expert but I don't think that the built-in pull up resistor is enough for what you need. I suspect that you need a debounce circuit. https://www.startpage.com/do/dsearch?query=debounce+circuit&cat=web&pl=opensearch&language=english

Just a quick note! The rain sensor is working with 5v! Hope you are using a level shifter / voltage divider. https://www.raspberrypi.org/documentation/hardware/raspberrypi/gpio/README.md 5V could cause the influence to other sensors and finally the end of your PI For the bounce during drying I wo…

that is an impeller type sensor - so Ok for nice clean water flowing out... not so good for any water that may contain usual detritus from a roof/drain - would get blocked almost instantly I would think. Re debounce - you could use a trigger node set to extend and with a nice large time constant (s…

Wow really fast and great Infos here, thanks to all of you. Node-red and it's community is really awesome! Well, this sensor belongs to the group of these cheap MH sensors. All with a LM393….commonly used in the Arduino world. And correct, they work with 5V ! I found that this rain sensor type "wor…

Nice Optical sensor but depending on your pipe work you could end with even more noise. These are made for water tanks. I assume that a water flow over this will make a lot of trigger impulses. The rain sensor is totally “logic free” only a little reed switch triggered by a magnet each time a litt…

[image] Christian-Me: I assume that a water flow over this will make a lot of trigger impulses. Yes I agree totally on all of this ! "water flow over this (Led like sensors) will make a lot of trigger impulses" Switch debouncing will be still a major task. The pipe is a drainage pipe around …

Hi again ! To close this topic for now and deliver some final results for people stumbling over the same stone... You can buy this "MH series" of cheap sensors often called "Flying Fish" in the Arduino world. They come in a range of configuration...LDR, NTC thermistor, resistive water/moisture det…

Your temperature sensor problem could be due to this: [image] Counterfeit DS18B20 Hardware I just found this in another forum: [edit] This link https://www.maximintegrated.com/en/support/faqs/ds18b20-faq.html also shows that the real DS18B20 is also a lot more accurate…

[image] GeorgeX: Thanks to Christian-Me for suggesting XKC-Y25-NPN. Ohhh I wonder if this might be good to monitor a sump pump hole. Stick it in a PCV tube with the bottom capped (so water won't rise up the inside of the tube) and set it in the sump hole....

Well I am 1000% sure, wiring, DS18B20, temp flow in node-red...and all other components of the system.....all this works perfect for month without any issues. It starts when I connect this MH sensor board. I can replicate these problems now at any time, with that potentiometer on the sensor board.…

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RPi zero w with LM393 / "flying fish" sensor

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ghayne 21 February 2020 13:08 9

Your temperature sensor problem could be due to this:

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RPi zero w with LM393 / "flying fish" sensor

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