Overcomplicatotron
Member
Nice find.View attachment 4315622 View attachment 4315621
I know this isn't as fun as building and coding your own but this has been on clearance for a few weeks now to anyone interested
https://m.liveaquaria.com/product/prod_display.cfm?c=747+6780+4699&pcatid=4699
I know the picture shows an ORP controller but that's incorrect, I called to verify before I purchased. All you need are a couple dosing pumps and a box and you're set.
There's a lot of stuff like this out there:
https://www.ebay.com/i/263669769197?rt=nc&_trkparms=aid=222007&algo=SIM.MBE&ao=2&asc=20160908110712&meid=52126894da384681b0b69abb588a58dd&pid=100677&rk=10&rkt=27&mehot=pp&sd=132432881832&itm=263669769197
I'll order one and see if it stays accurate for more than a few days of being submerged in a solution. It doesn't have to be lab-grade... Just basement-grade. I'm down there every day anyway, I don't mind calibrating once a week.
That and one of these (or something similar) monitoring a reservoir would be a fun project:
https://www.ebay.com/itm/DFROBOT-Sensor-water-quality-TDS-3-3-5VDC-Kit-module-cables-probe-Breakout/113698812150?epid=6030995607&hash=item1a78fa30f6:g:U38AAOSwDXxcmnEN