Hello all, thought I'd share my latest project with you. We are building a new home with basements, and as part of these basements we have installed sumps for groundwater and foul waste. UK building regulations stipulate that you must have a high level alert system, i.e. when the big holes in the ground fill up and the pumps have stopped working you need to be notified.
Rather than using an off-the-shelf box which has an input for a float switch (BORING) I decided to install ultrasonic distance sensors in each sump (and a temp / humidity sensor because... why not)
All tied together with various 3D printed parts - including 3D printed nuts and bolts (!), an Arduino Mega, Node RED, and data logging with Influx and Grafana.