Tank Level Sensor

thingiverse

03 October 2022 I made some adjustments to fit a d1 mini. as well as a hole in the cover for an antenna. I haven't actually had a chance to print this yet to confirm the adjustments but will shortly. 23 August 2022 I made a small adjustment to a dimension on the body but it wasn't big enough to warrant it being V3 21 August 2022 Here is my first attempt at making my own home assistant sensor. This should thread onto any two inch diameter NPT bulkhead and read the fluid level distance from sensor. This was also designed in a way that the ultrasonic sensor is a press fit the esp32 is loose in case you need to access the boot button and no soldering is necessary. I am working on another version to make the esp32 more secure, a temperature sensor on the cover, possibly a status led on the cover, and a slot to pass wires though to pick up other sensors. Parts: 1 - 3d printed body 1 - 3d printed cover 3 - #6 pan head screws 1 - esp32 NodeMCU such as: https://www.amazon.com/gp/product/B0718T232Z/ref=ox_sc_act_title_4?smid=A30QSGOJR8LMXA&psc=1 1 - HC-SR04 ultrasonic sensor such as: https://www.amazon.com/dp/B07R7RMXTY?psc=1&ref=ppx_yo2ov_dt_b_product_details 1 - micro sd charger/wall wart Assembly: 1. Print out body and cover 2. Insert wire jumpers on ultrasonic sensor 3. Press ultrasonic sensor into place. the emitter and receiver heads should be flush with the lower face. 4. Connect wire jumpers to the esp32 5. Insert already programmed esp32 into the body upside down with the micro usb port facing the hole in the side. 6. Secure cover to the body with the three #6 pan head screws. Program: Depending what this is used for the program will change. Seeing as i am using it for a 275 gallon oil tank i used the following program in home assistant. - platform: ultrasonic trigger_pin: 19 echo_pin: 18 name: "Oil Level" update_interval: 60s unit_of_measurement: "Gal" accuracy_decimals: 1 filters: - calibrate_polynomial: degree: 6 datapoints: - 0.0000 -> 275.0 - 0.0254 -> 272.0 - 0.0508 -> 269.0 - 0.0762 -> 265.0 - 0.1016 -> 260.0 - 0.1270 -> 254.0 - 0.1524 -> 249.0 - 0.1778 -> 243.0 - 0.2032 -> 236.0 - 0.2286 -> 230.0 - 0.2540 -> 223.0 - 0.2794 -> 216.0 - 0.3048 -> 209.0 - 0.3302 -> 201.0 - 0.3556 -> 194.0 - 0.3810 -> 187.0 - 0.4064 -> 180.0 - 0.4318 -> 173.0 - 0.4572 -> 166.0 - 0.4826 -> 158.0 - 0.5080 -> 151.0 - 0.5334 -> 144.0 - 0.5588 -> 137.0 - 0.5842 -> 130.0 - 0.6096 -> 123.0 - 0.6350 -> 115.0 - 0.6604 -> 108.0 - 0.6858 -> 101.0 - 0.7112 -> 94.0 - 0.7366 -> 87.0 - 0.7620 -> 80.0 - 0.7874 -> 72.0 - 0.8128 -> 65.0 - 0.8382 -> 58.0 - 0.8636 -> 51.0 - 0.8890 -> 44.0 - 0.9144 -> 37.0 - 0.9398 -> 31.0 - 0.9652 -> 25.0 - 0.9906 -> 19.0 - 1.0160 -> 14.0 - 1.0414 -> 9.0 - 1.0668 -> 5.0 - 1.0922 -> 2.0 - 1.1176 -> 0.0