hi, I'm trying to install a hydroponic system at home. I combined the dht11, ds18b20 sensors and the tds meter. but I'm finally getting an error in the ph sensor I'm going to assemble. I can't get a fixed value. For example, the value that should be 6.7ph shows 4.30 ph. When I watched the video and tried to calibrate it (I connected the bnc connector and shorted the voltage, I did 2.5), I succeeded once and got the value of 6.7. After combining it with another sensor on the breadboard, it broke down. Now when I try to make the same short circuit I see a constant voltage value like 1.5. and it never changes.
I hope you don't really expect a useful PH meter for less than $6. That's about the same as trying to measure fever with a DHT11.
Expect to pay considerably more than $100 for a meter that provides moderate accuracy.
This type of sensor doesn't have electric isolation and electric noise will give you wrong results.
The best solution I know is:
Is there anything I can do to prevent this? I need to use this device for a while. and i'm new at this. would the capacitor help block out the noise?
This type of module could work for you but you have to find a compatible with your module.
I second the Atlas Scientific parts. They are moderately expensive, but they "just work" when used as designed. Hook them up and then get on with what you actually wanted to do. Rather than fighting some poorly done circuit that may never work.
Use it as you like but don't expect a useful value from it. What does "I need to" mean? Is that a school project?
Throw that away and get an Atlas Scientific sensor if you want serious measurements.
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