Main Site Documentation

EC/pH Sensor


#1

Hello,
my electronic skills are weak. I have a question about Model A1002 conductivity sensor http://webpages.charter.net/tdsmeter/products.html
This sensor provides 0-5vdc output. If I understand correctly Fez spider can read analog values from 0 to 3.3V. How can I read higher voltage?

Thanks


#2

Use a voltage divider circuit to reduce the voltage to the range you are looking for.


#3

Thanks for tip. Is this the right way : http://hyperphysics.phy-astr.gsu.edu/hbase/electric/voldiv.html ?


#4

Or you can order this Gadgeteer pH & Temperature Module here:

https://www.loveelectronics.co.uk/products/214/ph-and-temperature-module


#5

Duke Nukem, thanks for link, but I need to meassure water conductivity, not pH.


#6

Actually, is very straight forward sensor. Just meassure voltage and transform it into MS. Transformation are done with table:

1000micro/S – 1vdc
2000micro/S- 2vdc
3000micro/S – 3 vdc
4000micro/S- 4vdc
5000micro/S – 4.8vdc

And the code snippet, if anyone is intersted in conductivity meassure:


Gadgeteer.Interfaces.AnalogInput _Sensor;
 GT.Socket _Socket;

void TimerTick(GT.Timer timer)
        {
            Debug.Print(_Sensor.ReadVoltage());
        }

private void Meassure()
        {
            _Socket = GT.Socket.GetSocket(9, true, null, null);
            _Sensor = new GT.Interfaces.AnalogInput(_Socket, GT.Socket.Pin.Three, null);
            _timer = new GT.Timer(1000);
            _timer.Tick += new GT.Timer.TickEventHandler(TimerTick);
            _timer.Start();
}



#7

James is working on a water conductivity module, see:

http://www.loveelectronics.co.uk/forum/index.php?/topic/13-new-module-ph-temperature-module/


#8

This looks promising, however I cannot find any info about sensor PT1000 on sensorex.com


#9

Is it just me or is the loveelectronics homepage totally dead would love a PH/temp module?


#10

Yes, they are out of the game.


#11

How sad i guess i won’t get a PH/Temp sensor form them then…


#12

http://www.practicalmaker.com/ (practicalmaker.com) has ph and EC shields. I’ve ordered one but haven’t gotten to using it yet


#13

I’m helping a client with a non-NETMF project that uses the Atlas Scientific EC, pH, & Temp (analog) sensors with their plug-in circuit boards. They are expensive but are very nice. I’d recommend them if your project will be in the wild for long periods of time.

https://www.atlas-scientific.com/sensors.html