# "Blackwater" Tank Level sensor - Rasp pi **URL:** \ **Category:** Raspberry Pi\ **Created:** [1 February 2021 00:12 UTC](https://forum.core-electronics.com.au/t/blackwater-tank-level-sensor-rasp-pi/9303 "2021-02-01T00:12:53Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![brian86770](https://avatars.discourse-cdn.com/v4/letter/b/c5a1d2/32.png) [@brian86770](https://forum.core-electronics.com.au/u/brian86770)\ **Post date:** [2 February 2021 08:32 UTC](https://forum.core-electronics.com.au/t/blackwater-tank-level-sensor-rasp-pi/9303/4 "2021-02-02T08:32:32Z")
> [@Project by Denver42165; Water Tank Level Sensor](https://forum.core-electronics.com.au/t/project-by-denver42165-water-tank-level-sensor/1896): > > Denver42165 just shared a new project: ["Water Tank Level Sensor"](http://core-electronics.com.au/projects/water-tank-level-sensor) Imagine getting home from work, its winter, its cold. You have a shower to warm up and half way through your shower… your water stops. You wrap a towel around yourself, remove the shampoo from your eyes and go out into the cold to swap the tanks as the water tank you were using had run dry. This was a common occurrence in my house… but not anymore. Now I can keep visually see the level of water in my water tanks on my iP… > [@Ultrasonic Water Tank Level Monitor](https://forum.core-electronics.com.au/t/ultrasonic-water-tank-level-monitor/5261/2): > > So if anyone is interested… I have spent all morning on this - remember this is my first python program too ! I found such inconsistancies in reading - most likely the second read would be well out there - sometimes twice as big as it should be - once 10 times! Other times, it could be a lot lot smaller than it should be… So it made me think - how to remove the outliers… If I could ignore the items that occurred at each extreme, and then looked at the average of ‘good’ data - would I then have… > [@Water tank level monitoring + Node Red](https://forum.core-electronics.com.au/t/water-tank-level-monitoring-node-red/5693/2): > > Well after a bit of thinking I have the node-red side more-or-less sorted, at least as a proof of concept anyway. I have used sliders to represent my GPIO’s being Hi or LOW and had to use a JOIN node to pull my 5 GPIOs together such that I could manipulate the data in a function node. A few ‘if’ statements later and I have chart representation of my theoretical water tank. Could this be more efficient, or is there a better way? [{"id":"762b3609.fe53a8","type":"join","z":"6d91a674.1b8e38","nam… > [@Water tank level monitoring + Node Red](https://forum.core-electronics.com.au/t/water-tank-level-monitoring-node-red/5693/6): > > Thanks guys, Noting the possible electrolysis issues, Im thinking of reverting back to measuring the depth of my water tank(s) with an ultrasonic sensor (with LoPy4 via TTN & NodeRed). I would want the LoPy4 to wake once from Deepsleep every 24hrs and the battery to last for a couple of months (or more). A few questions please: What regulator would you suggest to power the sensor (SEN0208)? Which battery would you suggest to achieve my goal of a couple of months? If the 5V power drain woul… just some reading… --- _[View the full topic](https://forum.core-electronics.com.au/t/blackwater-tank-level-sensor-rasp-pi/9303)._