Connecting pulse output to Piezo alarm
Connecting pulse output to Piezo alarm
(OP)
Dear all,
I am mechanical engineer with no background to circuitry and electronics. I am trying to connect a flow switch ( using hall effect ,12 dc input) and I want it to trigger a piezo alarm (12V dc) when water flow stops.
There are three wires from the flow switch, two for power and one for signal out. the signal out is pulse signal based on the flow. I need to know how to connect this pulse signal to piezo alarm so that alarm goes off when there is no flow.
Any help would be much appreciated.
thanks
I am mechanical engineer with no background to circuitry and electronics. I am trying to connect a flow switch ( using hall effect ,12 dc input) and I want it to trigger a piezo alarm (12V dc) when water flow stops.
There are three wires from the flow switch, two for power and one for signal out. the signal out is pulse signal based on the flow. I need to know how to connect this pulse signal to piezo alarm so that alarm goes off when there is no flow.
Any help would be much appreciated.
thanks





RE: Connecting pulse output to Piezo alarm
Quote: "the signal out is pulse signal based on the flow"
1) You have not given details of the piezo 'alarm' as to whether this is just a simple sounder or something more sophisticated that can be programmed.
2) You don't say what sort of pulse rate the flow switch produces or what sort of signal it is.
If the alarm is a simple sounder, the first thing to decide is what the longest interval between pulses from your flow switch will be before you consider the flow to be stopped. You will then need some sort of a 'hold up' and interface circuit which can drive the sounder. This will provide a time delay which is reset by each pulse and is just longer than the slowest pulse interval. This will time out after a delay and energise the alarm sounder.
RE: Connecting pulse output to Piezo alarm
It occurs to me that an easier solution might be to find a more suitable flow switch. The device you describe sounds more like a flow meter, which makes it a bit harder.
RE: Connecting pulse output to Piezo alarm
Hopefully you'll find a simple 555 Timer based circuit. You'll still need to interface the input (hopefully you'll find that to be straightforward) and the output (definitely straightforward).
Of course, these days you could also, very cost effectively, program an Arduino or whatever uC you like, to perform the same sort of function; and with more bells and whistles. But you'd still need to interface the I/O.
RE: Connecting pulse output to Piezo alarm
An electronic time-out between pulses will also work with your flow-meter, or you can use an actual flow-switch in addition to your flow switch.
RE: Connecting pulse output to Piezo alarm
I could suggest some, but I don't know the make and model of your flow device.
Best to you,
Goober Dave
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RE: Connecting pulse output to Piezo alarm
Thanks for replying.
I dont want to use paddle switch. The flow switch/meter is this one:http://www.ebay.com.au/itm/G3-4-034-Hall-effect-wa...
And alarm is this: http://www.jaycar.com.au/productView.asp?ID=AB3452...
I am looking at what VE1BLL suggested.
Cheers
RE: Connecting pulse output to Piezo alarm
RE: Connecting pulse output to Piezo alarm