pH sensor not working

[swisschris104]

Hi,

I am using the reef-pi board, and have the sensor plugged in, however whenever i go to calibrate I get the following error.

I am also not getting any current reading from it. It does this with the sensor plugged in and unplugged.

Here are my settings for the input

Here is pictures of everything plugged in.

 

[swisschris104]

Typical error i get without calibrating.

Also used the PH-Board driver and got no reading, but got no error. issue seem to be with the ph-ez0 driver? Any idea how i can fix .

(this is what i get when using phboard driver)

 

[robsworld78]

If you run i2cdetect -y 1 in the Pi terminal do you get a 63 in the list?

If not open the lid and you'll see a jumper pad and LED. With the controller running short out those two pads for about 5 seconds, the LED will flash 3 times when it resets. After that unplug power from the controller, power back up and it should be working.

 

[swisschris104]

I ram the command and did not get expected results. I will try that later when I am back home. Thanks!

 

[robsworld78]

I ram the command and did not get expected results. I will try that later when I am back home. Thanks!

If that command didn't print out a list then the I2C isn't configured on the Pi or you don't have i2ctools installed but it would say that. Don't bother with a reset just yet as its not likely that.

In your config.txt I didn't see the line that enables i2c, only the baud rate but it should be high up in the file. You should have this in there.

dtparam=i2c_arm=on

You can also comment out or delete the dtoverlay=pwm2-chan line, that's not needed.

 

[swisschris104]

Aha, Thanks

If that command didn't print out a list then the I2C isn't configured on the Pi or you don't have i2ctools installed but it would say that. Don't bother with a reset just yet as its not likely that.

In your config.txt I didn't see the line that enables i2c, only the baud rate but it should be high up in the file. You should have this in there.

dtparam=i2c_arm=on

You can also comment out or delete the dtoverlay=pwm2-chan line, that's not needed.

Aha, thanks! That did it sorta. but now i am getting another error

UI

ERROR

{"error":"Failed to json decode. Error: json: unsupported value: NaN"} | HTTP 500

Performed the rest and got the same error

 

[swisschris104]

- I reset the db and just added driver, connector and ph and got the same error.
- rebooted pi multiple times
- verified i had no other connectors setup on pin 0
- tried 2 different PH probes, and tried it with no probe
- attempted from accessing http://localhost directly from the pi
- I have one temperature probe plugged in and it works on problem, same goes with controlling power outlets

 

[robsworld78]

What do you get with i2cdetect -y 1?

 

[swisschris104]

What do you get with i2cdetect -y 1?

 

[robsworld78]

That looks good, circuit is working, it's 63. Stupid question, when you made the connector and selected pin 0 did you select the pH driver first?

 

[robsworld78]

To verify the hardware run the following commands.

Run the following commands.

This downloads a script to read pH circuit

wget -c https://www.robo-tank.ca/Robo-Tank_pH_Script.zip

sudo unzip Robo-Tank_pH_Script.zip

python Robo-Tank_pH_Script.py

After you run the 3rd command you will see.

Enter command:

Type in (must be capital letter) and press enter.

R

It should print out a pH value.

 

[swisschris104]

Thanks, yeah I couldn't add pin until i selected driver. Ran that script and it is giving the output of "NaN" So I guess the error makes a bit more sense now.

I ran the script with PH probe plugged in and unplugged and got the same results.

 

[robsworld78]

Unbelievable, I don't know why it's doing that, I don't think I've seen it. Try that reset jumper again, after doing that power cycle the controller. If that doesn't work I'll have to send you a replacement.

 

[swisschris104]

Just tried to reset it again, and reinstalled raspberry os onto a different SD card and ran your script and got the same results of NAN

 

[robsworld78]

Thanks for trying that. NAN means "not a number" so not sure what's going on there, sorry about this. The forum is catching all my pH issues lol, I promise you it's really not that bad. Out of 273 controllers there's only been 4 with unknown issues, this is one of them, thankfully the other pH issues I have fixed now. I'll get a replacement shipped out tomorrow, are you ok to remove the board from case and drop in the new one?

 

[swisschris104]

Thanks for trying that. NAN means "not a number" so not sure what's going on there, sorry about this. The forum is catching all my pH issues lol, I promise you it's really not that bad. Out of 273 controllers there's only been 4 with unknown issues, this is one of them, thankfully the other pH issues I have fixed now. I'll get a replacement shipped out tomorrow, are you ok to remove the board from case and drop in the new one?

No, worry, it happens. I'll be able to remove and reinstall the board into the enclosure. It's just a few screws. Thanks for the replacement. I will shoot you a email with just a link to this thread, so whenever you ship you can provide tracking. Once the new board arrives I will be able to ship you the one with the error bac. we can discuss via email. Thanks!

 

[robsworld78]

No, worry, it happens. I'll be able to remove and reinstall the board into the enclosure. It's just a few screws. Thanks for the replacement. I will shoot you a email with just a link to this thread, so whenever you ship you can provide tracking. Once the new board arrives I will be able to ship you the one with the error bac. we can discuss via email. Thanks!

Sounds good and thanks for understanding. I'll be sure to cover shipping back the bad, I would like to see if it's component or programming didn't go right.