Pressure Transducer #635
Replies: 6 comments 26 replies
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Now all you have to do is set up the clean/dirty pressure for the filter and it will tell you what percentage of clean the filter is. |
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There is mention under "high pressure alarm" in REM of an alarm pin. Is there a way to set a specific gpio pin as an alarm? |
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OK, this is crazy! Trying to get back to this (after I get my heater going again ... LOL!), but I have the same pressure transducer. Will try to help out here, if I can 😄. One question, as my wife threw out my wiring diagram, when she was cleaning up for Thanksgiving ... arrgh! Do you happen to have the pinout on the connector (on the transducer side of things)? Make sense? Thanks! |
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Well you only need two pair of cables for a wired ethernet connection... That CAT5 is perfectly capable of running your ICP and sending internet to your pad. Just need some CAT5 ends and the appropriate crimpers. |
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Use the existing cable to pull a second line? Is the conduit big enough? |
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Ya, I was thinking about that too - don't need high speed 🤣. Let me dig a bit more on that one, I may be able to jury rig something. And I have time, waiting for my transceivers to come in ... LOL.
Conduit? Surely you jest ... LMAO. Builder - just put the CAT5 directly in the mortar ... that's their "conduit". |
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Obviously the color of the wire doesn't matter as long as the pinout is correct. |
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Yep, agreed! 100BASE-TX |
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And, this - I tend to use 586B, but either way, those pins are pairs (as needed / desired), |
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OK, this is working awesome - thanks!! Found my cabling issue, now up and running, So cool 😎 |
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LOL - no worries, I'd say the same too 🤣 Need to figure out how to PM you - curious about your background 😆 Have a great holiday break! |
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My background is pretty disappointing. I am self taught by YouTube and Google. I wish I were an electrical engineer. Someday I want to get my masters in EE so I can finally start to "understand" how on Earth these things work. I can't code worth crap but wish I could. YouTube and Google are slowly teaching me, though. Someday I want to get my masters in CS so I can finally start to "understand" how on Earth these programs work. Oh, and I'm not really good at my day job either. But I already have a terminal degree in that field. And still rely on YouTube and Google on a regular basis... 😜 |
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Hey, a lot of times - self taught can be better than formal, depending on the individual 👍. To me ... attitude and aptitude go a long ways! I've got a BSc and MSc in EE ... from quite a ways back (BSc '88, MSc '90). Ya, that part hurts ... LOL. |
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The thing is, I feel like with enough time I could get a good grasp of electrical engineering. A lot of it just simply makes "sense." Coding a piece of software like these gentlemen have done feels about as likely as going to the olympics. |
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Both very logical, just different logic. As tag says, spinner turns the other direction 🤣 |
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FYI, from Grafana 😄 |
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I've not yet setup grafana. My buddy tried but didn't make it very far. |
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Yell if you have any questions - more than happy to help you out! Do you have the data going to influx? |
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Me... I live in the moment. I try not to look too much into the past or plan too much for the future. 😉 I will see if he wants to join the discussion as he is the one who wants the features. |
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I have a Raspberry Pi 4, stacked with Sequent Mega-Bas and 8-Relay board. I want to add transducers for both filters (pool and spa). |
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Answered here: #995 (reply in thread) |
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Using this Pressure Transducer from Amazon:
Sender Sensor for Oil Fuel Air Water,1/8"NPT Thread Stainless Steel (100 PSI) https://a.co/d/5rtLmen
And this cheap ADC board from Amazon:
NOYITO 4-Channel 16-Bit ADC with PGA for RPI Raspberry PI 16 Bits I2C ADS1115 Module ADC 4 Channel for Raspberry Pi 3 2 Model B B+ https://a.co/d/2hg9T9O
We were able to accurately get pressure readings on my friend's setup using 3.3V without using a level shifter. We specifically chose 100psi in case it did need 5V for the logic, so that the pressures in the pool range would be well under 3.3V, but that ended up being unnecessary.
We setup in the ADC menu with a 4.096v power gain. Maybe another number would be more appropriate here?
Feeding the voltage to a generic pressure transducer:
With the pump off and the filter bled (0 PSI), we got .269v from the probe (assuming this is the y intercept?) So we put 0.3v as the inducer offset. (We expected this to be 0.5V from the limited data available on the Amazon page, but that is based on the expected range of 0.5V=0 pSI and 4.5v=100 PSI, but that is based on 5V input voltage.)
We then checked the PSI on the analog filter guage with the pump at different speeds, and found the slope of the line to be about 40PSI per volt.
For the pressures under 30 that the pool pump runs at, this gave pretty reliable readings.
Feeding that generic device to the filter pressure in njs-PC shows up on the home page. We tested the flow sensor for REM chem controller by just unplugging the cable from the sensor, and the warning popped up shortly after.
Pretty cool!
I have no clue if this was the proper way to set this up but happy with the results so far.
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