reef-pi :: An opensource reef tank controller based on Raspberry Pi.

[DirtDiggler2823]

Just attach more probes to the signal line in parallel. 1-wire allows multiple devices and each device (should) have a unique address set by the factory.

Bummer on the dead probe - that’s a weird failure. If you still have the dead one, can you cut the metal pill apart? I’m curious if the failure was water ingress.

I still have it. I might try to pull it apart to see what happened.

 

[Bigtrout]

I

I have both steel and powder coated (canakit version) probes running for over two years now without any issue. My probes have 5 feet’s wires at max. I know @Erica-Renee had tried some longer length probe wires

The ones I got, disappeared from amazon, but the wire is 3 meters long, so about 10 feet and they are working fine. They were drok branded, made in canada, with red high temp silicone insulation and even shielded. They are reading within .1F of each other and within .1F of my ITC1000 with an 10k ntc thermistor. I have a different 3 meter coming from drok but its not the same version this time but still has a 3 meter length and black insulation like the million others on amazon. I will report if its a decent option when it arrives.

 

[Erica-Renee]

Question, I have three probes but did not see any where to set the master/slave relationship. How do you do that?

Thanks :)

You don't . AHH.. I am not good at Explaining Technical stuff So here is where i got my Info for my testing .

Right from the source
https://www.maximintegrated.com/en/app-notes/index.mvp/id/148

 

[Diamond1]

Just for a reference for everyone I got a a ds18b20 from adafruit. It was the first probe I got and was coated in silicone before I put it into use. I started getting erratic readings in the reef-pi interface and took it out to check it. Apparently the silicone didn't do it's job very well because I noticed it had some rust on it. I just took it apart to check it to see if the sensor was intact and found this.
These are supposed to be waterproof and the only reason I used silicone was to keep the probe from rusting. After inspecting the sensor I found that whatever they used to seal the probe and keep it water tight had a big gap in it that allowed water to get into the probe and short it out.

 

[DirtDiggler2823]

Just for a reference for everyone I got a a ds18b20 from adafruit. It was the first probe I got and was coated in silicone before I put it into use. I started getting erratic readings in the reef-pi interface and took it out to check it. Apparently the silicone didn't do it's job very well because I noticed it had some rust on it. I just took it apart to check it to see if the sensor was intact and found this.
These are supposed to be waterproof and the only reason I used silicone was to keep the probe from rusting. After inspecting the sensor I found that whatever they used to seal the probe and keep it water tight had a big gap in it that allowed water to get into the probe and short it out.

I'll probably find something similar

 

[b4tn]

Just for a reference for everyone I got a a ds18b20 from adafruit. It was the first probe I got and was coated in silicone before I put it into use. I started getting erratic readings in the reef-pi interface and took it out to check it. Apparently the silicone didn't do it's job very well because I noticed it had some rust on it. I just took it apart to check it to see if the sensor was intact and found this.
These are supposed to be waterproof and the only reason I used silicone was to keep the probe from rusting. After inspecting the sensor I found that whatever they used to seal the probe and keep it water tight had a big gap in it that allowed water to get into the probe and short it out.

This is why I plan on making my own temp probe. With so many counterfeit ones out there might as well buy the actual legit part and seal it in a piece of tubing yourself. Then you know you have a legit sensor and it’s been sealed by you. Can anyone recommend a reef safe epoxy? Something that you could just dip the sensor and wires in?

https://www.digikey.com/product-detail/en/maxim-integrated/DS18B20/DS18B20-ND/956983

 

[Diamond1]

I'll probably find something similar

I wouldn't be surprised. I'm thinking of using an old API test tube and filling it with silica based sand with the probe in it and the top sealed with silicone to keep the probes out of the water maybe that will help.

 

[DirtDiggler2823]

I wouldn't be surprised. I'm thinking of using an old API test tube and filling it with silica based sand with the probe in it and the top sealed with silicone to keep the probes out of the water maybe that will help.

I'm thinking clear epoxy would be better.

 

[figaro93]

[QUOTE = "Ranjib, post: 5551858, membro: 67835"] Puoi iniziare un thread di build? Abbiamo bisogno di molti più dettagli tra cui il tipo di relè e il circuito ecc. Può essere un sacco di cose diverse se non segui le guide così come sono [/ QUOTE]

certo ora aprirò un nuovo battistrada
il problema e che non posso seguire le guide alla lettera su questo tipo di passaggio perché non vivo in america ma in Italia e tutte le attrezzature che arrivano qui hanno una presa diversa dalla tua
quindi volevo inserire i relè solo per montare la classica spina europea

 

[figaro93]

sure now I will open a new tread
the problem and that I can not follow the guides to the letter on this type of passage because I do not live in america but in Italy and all the equipment that arrives here have a different plug from your
so I wanted to insert the relays just to mount the classic European plug

 

[stefanm]

@Ranjib when i enter:" sudo systemctl start ntp.service", I get the following error, "sudo: unable to resolve host raspberrypi"

Any ideas?

 

[Ranjib]

@Ranjib when i enter:" sudo systemctl start ntp.service", I get the following error, "sudo: unable to resolve host raspberrypi"

Any ideas?

dont use ntp, use systemd-timesyncd

systemctl start systemd-timesyncd.service
systemctl enable systemd-timesyncd.service

 

[Ranjib]

@Ranjib when i enter:" sudo systemctl start ntp.service", I get the following error, "sudo: unable to resolve host raspberrypi"

Any ideas?

did you find this in any of the offical/adafruit docs? I should update them to use systemd-timesyncd

 

[rushbattle]

This is why I plan on making my own temp probe. With so many counterfeit ones out there might as well buy the actual legit part and seal it in a piece of tubing yourself. Then you know you have a legit sensor and it’s been sealed by you. Can anyone recommend a reef safe epoxy? Something that you could just dip the sensor and wires in?

https://www.digikey.com/product-detail/en/maxim-integrated/DS18B20/DS18B20-ND/956983

I got ten of these, shipping out tomorrow. Gotta be better, though not much cheaper, than the assembled probes.

 

[theatrus]

I'm thinking clear epoxy would be better.

Pretty much any casting or potting epoxy should be fine (they shrink less than others so work better in large fills)

 

[DirtDiggler2823]

Pretty much any casting or potting epoxy should be fine (they shrink less than others so work better in large fills)

I've been curious about their thermal conductivity though.

 

[stefanm]

did you find this in any of the offical/adafruit docs? I should update them to use systemd-timesyncd

I found it on the GitHub headless install page.

 

[figaro93]

ragazzi finalmente ho risolto grazie a un vecchio post di ranjib in cui mi ha consigliato dopo aver scritto in configuration.yml per riavviare la piattaforma ...
Fatto questo i relè si accendono
Grazie ancora

 

[figaro93]

guys finally I solved thanks to an old post of ranjib in which he advised after writing in configuration.yml to restart the platform ...
done this the relays turn on
Thanks again

 

[Ranjib]

guys finally I solved thanks to an old post of ranjib in which he advised after writing in configuration.yml to restart the platform ...
done this the relays turn on
Thanks again

please dont follow this thread, and use the adafruit guides instead. the posts in this thread reflects the state of reef-pi at that time, and likely to be outdated