[FEATURE] - Aeroponics Accumulator Tank Pressure Sensor

[JLefebvre55]

Source a pressure sensor for the aeroponics subsystem accumulator tank. Reports to computer. Allows for shutoff of pump in case of emergency.

Context

Is your feature request related to a problem? Please describe. There is currently no way to know what pressure the system is at other than when the pump turns off. This is inaccurate and unreliable. In addition, unforseen pump runaway could result in catastrophic tank failure (i.e. violent explosion).

Describe the solution you'd like Source components and develop software for a pressure sensor that:

• [x] Can read between 0-125PSI
• [x] Can be interfaced with easily by our microcontroller Standard library linked in comments
• [x] Attaches to our existing system easily 1/4 BSPT female to 1/2" NPT male adapter, replace 1/2-1/2 female coupler with 1/2-1/2-1/2 female tee

TODO:

• [x] Source sensor and any necessary adapters
• [x] Find code (existing libraries?)
• [x] Update docs
  • [x] plumbing diagram
  • [x] BoM
• [ ] Buy and test

[nchareunsouk]

Potential pressure relief valve candidate: https://www.grainger.ca/en/product/RELIEF-VALVE-3-4-X-1-2-IN-MNPT-X-FN/p/WWG2X318?analytics=RecommendationZones&cm_sp=IDP-_-CAV-_-TR-_-PR-_-PLA-NA-_-EN&cm_mmc=PPC:+Google+PLA

[nchareunsouk]

https://www.codrey.com/arduino-projects/how-to-play-with-a-water-pressure-sensor/ https://wiki.dfrobot.com/Gravity__Water_Pressure_Sensor_SKU__SEN0257 https://www.digikey.ca/en/products/detail/dfrobot/SEN0257/8341836?s=N4IgjCBcoLQBxVAYygMwIYBsDOBTANCAPZQDa4A7AMwIC6AvvYQExkgDKAogHIAMzAVgogGQA

Pressure sensor + code.

[JLefebvre55]

@nchareunsouk could we source a cheaper BSPT-NPT adapter?

[JLefebvre55]

Potential alternate (still G1/4 threaded tho): https://www.digikey.ca/en/products/detail/seeed-technology-co-ltd/114991178/7387419

[nchareunsouk]

@nchareunsouk could we source a cheaper BSPT-NPT adapter?

@JLefebvre55 most of the alternatives on amazon cost just as much: Example 1 Example 2

It also costs as much at other stores: Example 3

~$20 seems to be the going rate for this adapter.

[nchareunsouk]

Potential alternate (still G1/4 threaded tho): https://www.digikey.ca/en/products/detail/seeed-technology-co-ltd/114991178/7387419

@JLefebvre55 It would probably be better to stick with the DFRobot one since they're both available on Digikey, both use G1/4 but the one from DFRobot has an Arduino library and a higher pressure rating.

[JLefebvre55]

Purchased sensor, adapter. Still need to buy tee

[JLefebvre55]

Everything's been assembled, haven't tested sensor yet

[JLefebvre55]

Reopened for testing