I’m currently trialling a pressure transducer (industrial build) which connects into the outlet pipe (yeah I know a bad idea - very low readings when the pump is running - but was easiest to fit a tee and test it) but having trouble with linearity of ADC readings on the ESP32 module I’m using.īased on what others have experienced I’ll probably end up with a drop-in type pressure sensor (buy one to read 50-100% greater water head than you have, you can get these from around USD25 on aliexpress), 4-20mA current loop type, and a current loop > Voltage conversion module to read it on an ADC. I then tried the HX711 pressure sensor (same as a washing machine, place the sensor above the water level then drop an air filled hose into the tank) which works OK, but air temperature in the tube still causes +/-5% readings across a day. I don’t know if waterproofing failure is necessarily an issue (mine were the waterproof type, surface mounted to holes in the tank top), the technology is just not a great choice for reading distance from a water surface. Sure you can overcome all these issues, but I ended up with a very complicated set of filters and lambda’s to get sub-par results. If using ultrasonics you need to put a lot of constraints on your readings: if your tank top is flat and gets a good moisture film, you can read 2x the distance to the water surface and end up with negative values if you have a top fill entry point, all readings will be messed up when there is water entry and the water surface isn’t smooth. cheap - sensors, not the industrial quality which I’m sure would perform better but probably cost more than my 4000L tank) the air temp / humidity inside the tank gives you +/-10% readings or greater during a typical daily temperature cycle. One pair failed after a few months, the second set developed blisters on the front surface and wouldn’t read consistently.įailures aside (and bear in mind I’m using the domestic - ie. Monitor your rainwater level, inflows and usage from the top of your tank or your mobile device with this smart tank gauge. I agree ultrasonic sensing isn’t ideal I gave up after a couple of failed attempts.
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