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Flowmeter using Smart implant

Flavio Lins Bahia


I need a help to read a flowmeter signal and show the Liters usage on a scene to send me the information of when I should change the water filters

I manage to install an relay on IN1 of smart implant but don't know how to make HC3 read this information


Below are the circuit that I made and I have the clean signal on IN1

Can you walkthrough me to create a variable and a scene to read this information? 

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Hey there Flavio,


Here are some pointers:

The flow meter measures flow by sending pulses from 8Hz to 300Hz.  I wouldn't send the signal via transistor and relay, as the relay will waste power and may not switch fast enough.  Also, there is no voltage mismatch that you need a relay to overcome.

The Smart Implant can measure voltage.

So, you need to convert the frequency into a voltage.  You can buy a prebuilt circuit off eBay for this purpose, for ~$20.


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Then, connect the converter between flow meter and smart implant IN1.


Use your controller to read the voltage on IN1 every minute

Write some LUA code that converts the voltage into litres. You may need to do some calibration experiments.

Set up a variable called "TotalLitres" , and every minute add the water usage for that minute to the total


Check the variable as part of your code, and when it equals the filter change value, do something like flash a light.

Then work outa way to rest the variable once you change the filter.


Hope this helps!!


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