ph board question.

[ls1fst98]

i purchased a ph board and sensor off amazon which most likely is the wrong one. but if i can make it work id greatly appreciate the assistance. heres a pic of the one i have, it has 6 pins off the back labeld v+, gnd, gnd, po, do, to. hopefully this one will work with reefpi. thanks again.

 

[attiland]

i purchased a ph board and sensor off amazon which most likely is the wrong one. but if i can make it work id greatly appreciate the assistance. heres a pic of the one i have, it has 6 pins off the back labeld v+, gnd, gnd, po, do, to. hopefully this one will work with reefpi. thanks again.

If you can read it with any script you can put the values to a file and get reef-pi to process it.
I have just done the same with humidity sensor.

 

[elysics]

That board outputs the measured pH as a +-2.5V analog signal on the Po pin. It being analog and not digital, the Pi cannot read it and you need to put some adc between that and the pi, preferably one that already has a reef-pi driver written for it, forgot which ones that were.

 

[attiland]

That board outputs the measured pH as a +-2.5V analog signal on the Po pin. It being analog and not digital, the Pi cannot read it and you need to put some adc between that and the pi, preferably one that already has a reef-pi driver written for it, forgot which ones that were.

ADS1115 Has support

 

[ls1fst98]

ADS1115

ok, so im ordering that board now. since this is all kind of new to me, roughly how would i wire this between the pi and the ph board?

 

[elysics]

ok, so im ordering that board now. since this is all kind of new to me, roughly how would i wire this between the pi and the ph board?

Ads to pi is gnd to gnd, v to 3v3,sda to sda and scl to scl. Best look at the reefpi guides or Google pi i2c on how to set it up and which pins to use, there are some extra commands and settings to make it work.

Ph board to ads1115 is gnd to gnd and po to one of the analog inputs a0-a3

Edit: on second thought, not sure if the ads1115 will handle negative voltage right without some extra work /parts, maybe the others can chime in

 

[avfv]

This pH board is only bad quality analog front-end for pH probe. True pH meter has femtoamp buffer amplifier, at least 16 bit sigma-delta ADC and galvanic isolation.
My one-day solution:

My design based on EVAL_CN0326-PMDZ board from Analog Devices, I used old and cheap opamp LMC662CN and 16bit ADC AD7792; DIP package allow air connection between probe output and opamp input to eliminate any PCB leakages.
I reach true 15 bit readings, works great - clean response without any noise even on prototype board.

 

[attiland]

Ads to pi is gnd to gnd, v to 3v3,sda to sda and scl to scl. Best look at the reefpi guides or Google pi i2c on how to set it up and which pins to use, there are some extra commands and settings to make it work.

Ph board to ads1115 is gnd to gnd and po to one of the analog inputs a0-a3

Edit: on second thought, not sure if the ads1115 will handle negative voltage right without some extra work /parts, maybe the others can chime in

Cheap pH Meter for Raspberry Pi with ADS1115 and PH4502C – andrewgrabbs.com

www.andrewgrabbs.com

 

[robsworld78]

Cheap pH Meter for Raspberry Pi with ADS1115 and PH4502C – andrewgrabbs.com

www.andrewgrabbs.com

Those need isolation, not very good without.

Robo-Tank Isolated pH Circuit for reef-pi

This is a precise, fully isolated pH circuit constructed using high quality components and is designed to integrate with the Robo-Tank aquarium controller. Don't have or need the controller, thatRobo-Tank Isolated pH Circuit for reef-pi - This is a precis

www.robo-tank.ca