Hi, I need to detectt the flow of water through a pipe of 1" Diameter but I can't find anything to do the job
This is exactly what I need but for 1"
This is the SeeedStudio Liquid Flow Switch. This sensor works as a switch, conducts while flow pass though. It features the maximum resistance of 100 ohm. Maximum load current is 1.0A and the maximum load power is 10W. More information is given in specification tab. Color may vary. The thread is a 1/2 inch NPT tapered thread, one on each end.
Does somebody saw something like this for 1" somewhere? Any other idea of how I can detect the flow of water through the pipe, the pipe is always full of water, but I need to know when the flow start.
Thank you johnwasser, I never bough something from China, but I think it will be my only choice. I don´t have nothing againt China products, but hope the shipping don´t take too long
Depending on WHY you want to know about flow, and what flows are involved, two "answers" may be available....
a) Keep an eye on the pressure in the pipe, or the pressureS at two well chosen points.
b) Why does the water move? If it moves because of a pump, just monitor the electricity going to the pump.
(I'm not calling anyone stupid with that second suggestion.... well, unless you include me in the group. For YEARS I looked for a way to watch for leaks from my domestic water system at times when I'm away from the house... before realizing that as I am on a well, monitoring the well's pump would alert me to a leak.)
I got really lucky on ebay and got a new elster amco meter v-100 3/4" for $15 including shipping. It cost me an additional $18 for the couplings that I sourced at the local plumbing supply house - I tried to get the couplings online - but couldn't really find any thing that much cheaper based on not knowing actually what would work.
This type of meter is simple pulse and I'm using it for whole house water count.
A quick search on ebay (just now) I found a buy it now for about $46 with shipping.
I can't recall if I found a doc or just tried different pairs - I've had mine running for 11 months - so I'll check out the color pair that I wired up and post back in the next day or so.
I worked on this some today... If you apply 5V/ground to the red/black the other two wires (blue and yellow IIRC) will go high (5V) when the meter increments another full unit then falls low (0V) before the halfway point (need to test more to pinpoint this...manually blowing air into the fitting on my bench was getting old fast) to the next full unit and back to high at one full unit. It appears each instance of going high marks 1 unit.
Now to decide how to use this info I am thinking of polling the unit every 30 seconds, recording the state (high or low) then incrementing a number if the state has changed. This number will then be sent to Cosm...
If anyone has a better/different solution I am certainly open to ideas!
For the record I wish this sensor (elster amco meter v-100 3/4) had better resolution =( It looks like it will be great for "I used this much water today/this week" but not so great for what I wanted which is more of a "when is water being used and at what rate". For example I just flushed a toilet and it went from a little under 14.2 to a little over 14.3 which is going to result in exactly nothing on whatever graphing solution I end up with. I am thinking an analog sensor that changes based on the rate water flows through it might be more my speed since I care more about flow/duration
Also for the record the male threads on the meter seem to be not quite right/not standard plumbing threads. This is according to two folks in different plumbing departments and me since one connection worked on the first try with plumbers dope and the other leaked with plumbers dope and still leaks (ever so slight drip once every few minutes) on the second try with another round of fittings and teflon tape. Disclaimer: I have never used plumbers dope before so I might not have used enough or let it cure long enough...
You need "water meter couplings" do a search on google and you will see what they look like.
See one of my comments above - they cost about $18 for a pair of them. I when too a plumbing supply place (the big box stores aren't going to have them). You should be able to find them on eBay.
Polling every 30 seconds is not going to work you will miss pulses - could use an interrupt to catch the pulses.
I tried to give your code a whirl on a spare Arduino but it exploded (see below)
watermeter.cpp: In function 'void loop()':
watermeter:43: error: 'outbufferIdx' was not declared in this scope
watermeter:45: error: 'OutTitle' was not declared in this scope
watermeter:51: error: 'outbuffer' was not declared in this scope
watermeter.cpp: In function 'void OutBufferPrint(int, long unsigned int, long unsigned int)':
watermeter:66: error: 'outbufferIdx' was not declared in this scope
watermeter:66: error: 'OUTBUFFER_SIZE' was not declared in this scope
watermeter:69: error: 'outbuffer' was not declared in this scope
watermeter:69: error: 'outbufferIdx' was not declared in this scope
watermeter:73: error: expected `}' at end of input
I really do appreciate you taking the time to do this My coding skills are weak and this will give me a great opportunity to dissect known-good code in an attempt to better understand.
The pin is set as an input, the only source of voltage is from the Arduino itself (5V) and pins are rated for 5V so...no need for alarm (or for a resistor) right?