Has anyone tried these water level sensors?
http://www.ebay.es/itm/Gravity-Non-contact-Digital-Water-Liquid-Level-Sensor-For-Arduino/282694284985?hash=item41d1e476b9:g:EMEAAOSwFbJZ4jTU
They may be useful for a client who wants to detect when his water tank is getting low but I was wondering, before I order one, if anyone around has tried them
Thanks
Looks very much like the one I picked up on Taobao for a fraction of that price (no idea what the extra board is supposed to do as it just outputs an on/off signal). The type number is almost the same even.
I tested it on a small plastic container and it works. Haven't used it beyond that. I think it's a capacitive sensor, it's got a small screw to adjust the sensitivity. Won't work on metal containers, only plastic or other non-conductive material.
The board has 2 functions, 1.-Provides the momentary switch to activate the calibration function (looks like the sensor "remembers" this setting), and 2.-Has some filter capacitors in all lines (+5, pulse out, calibration)
Can you provide a link to the product you bought? Taobao seems to be a chinesse page but maybe by the product name I can find your product on another provider that's closer to me
The container I will be using is plastic
Thanks!
I use these sensors to monitor water level in a large HDPE storage tank for domestic water. They have worked well.
See my post here for some additional information:
http://www.robotshop.com/forum/post-p128300#p128300
You may need to include code to debounce a sensor if the water level in the tank partially covers the sensor area. This problem would occur as the water level rises and falls and just happens to stop about the middle of the sensing area.
Interesting...Ok, I guess I will give them a try.
I was curious about using them on 3v too, as someone mentioned in that link. I would try to use a Wemos Board (ESP chip, 3.3V)
Thanks
Haven't tried that, only 5V. They're rated for 5-24V so this may or may not work. Sensitivity may also go down. Try it out, I'd love to hear about it.
The specs are for 5-24 V operation. Cheaper ebay offer here.
Oh btw, I see that when they provide the small cirtcuit board that links the sensor to the specific board, the pulse switch on the board acts as "calibration", but when used without the board, the "mode" wire, seems to toggle between Normally Open o Normally Open output, is this right? I wonder how the "mode" switch has a different function with no logic in between
jremington:
The specs are for 5-24 V operation. Cheaper ebay offer here.
True, but to me it states "Shipping: Does not ship to Spain | See details "
I found a slightly expensiver provider in my country buut I prefer a short delivery time now
Thanks