Water Pressure Sensor

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QcVictor
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Posts: 46
Joined: 23 Feb 2016, 00:47

Water Pressure Sensor

#1 Post by QcVictor » 10 Jul 2016, 14:28

Hi Guys
I plan to monitor my pool pressure filter with Wemos D1 Mini and this kind of transducer, http://www.banggood.com/Pressure-Transd ... 07341.html wiring look straight forward, Connect red to 5V, black to ground, yellow tout pin. Can't be much easier.
About the setting, in ESP Easy which device I should use ? Analog ! In domoticz I see Pressure (Bar), the scaling should be done through formula ?

dduley
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Posts: 93
Joined: 06 Feb 2016, 17:56

Re: Water Pressure Sensor

#2 Post by dduley » 11 Jul 2016, 23:35

QcVictor wrote:Hi Guys
I plan to monitor my pool pressure filter with Wemos D1 Mini and this kind of transducer, http://www.banggood.com/Pressure-Transd ... 07341.html wiring look straight forward, Connect red to 5V, black to ground, yellow tout pin. Can't be much easier.
About the setting, in ESP Easy which device I should use ? Analog ! In domoticz I see Pressure (Bar), the scaling should be done through formula ?
Hi QcVictor,

It is never as simple as you think. I am using that same sensor to do exactly the same thing that you want to do. The problems are 1: The Tout pin is 0-1 volt only. The sensor outputs 0 - 4.5 volts so you will need to scale the sensor output. 2: The sensor output source impedance is very high so any loading will drop the signal to nothing. This was the case with my NodeMCU ESP module, which has a resistor divider to scale the input to 0-3.3V. The resistor selection that they used on the NodeMCU completely killed the sensor output. I chose to build a small opamp circuit to act as a signal conditioner. It amplifies the high impedance signal from the sensor, scales the output to whatever range I am restricted to and adds a bit of filtering to reduce noise. After I did this I then designed a new ESP board that has 8 configurable mechanical or solid state relay outputs, 8 optically isolated high voltage capable inputs (up to 240 VAC!), 5 signal conditioned analog inputs, Wide range power input of 9-40 VDC or VAC and I threw in the capability to accept a 315mHz remote control receiver. It was specifically designed to be a pool control and monitoring board. Its called the ESPEveryThyng-885 and will soon be available on www.IoThyngs.com.

Any route you take I highly recommend an opamp amplifier between your sensor and ESP.

Best regards

Dave

JR01
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Posts: 260
Joined: 14 Feb 2016, 21:04
Location: South Africa

Re: Water Pressure Sensor

#3 Post by JR01 » 12 Jul 2016, 07:44

Hi dudley, great response post, great board - your 885 board !
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IOTPLAY. Tinkerer, my projects are @ http://GitHub.com/IoTPlay, and blog https://iotplay.org. Using RPi, Node-Red, ESP8266 to prove Industry 4.0 concepts.

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