Please can you tell me the size of your tank? I have been struggling to get a reliable reading with a narrow steel tank and I suspect that the sound is reflecting off of the sides.
I’ve noticed a interesting issue and fix when trying to set up a ultrasonic sensor, that I thought I would share.
While trying to setup a ultrasonic sensor using ESPHOME, it was only providing a distance value when the ESPHOME first booted. From then on it would report the “Distance measurement timed out!” error, soft restarting/rebooting the ESPHOME device and it would report a new value once and stop again. Here is my sensor setup. Nothing too fancy.
sensor:
- platform: ultrasonic
trigger_pin: GPIO1
echo_pin: GPIO3
update_interval: 60s
pulse_time: 10us
timeout: 6m
name: "Distance"
filters:
- filter_out: nan
Oddly while trying to work out what was wrong, I was increasing the logging level to see what was happening. When I set logging to very verbose, the sensor started working as expected, updating every 60 seconds, yet changing the logging to a lower setting and it stops working!?
Anyone else seen this issue or know what is happening?
If your unit is stuck in the “Distance measurement timed out!” error loop, try adding this to see what happens. Worked for me!
logger:
level: VERY_VERBOSE
My tank is 160 liters. Sorry for not replying sooner!
Try to increase the timeout setting.
Good work on getting it to work… can I just check whether you managed to get the UART running, or just the PWM one?
Just waited well over a month for the former to arrive, and will be slightly gutted if it ends up not being compatible with ESPHome.
TIA.
Only the PWM one I got to work 
Never bothered to investigate more on the UART one…
Ach! Never mind. Thanks for getting back. Have ordered a PWM version, which should be here by…the end of January 
. May well be back around then. Happy boating until then!
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Just got my analogue sensor through. Plugged into my ESP32 with the pin arrangement (but no resistors, as didn’t have any), and it’s working perfectly. Seems really quite stable.
One question: did you manage to construct a good template for turning the distance into a percentage…?
TIA
Hello Ross, I made a template sensor in HomeAssistant for this purpose.
sensor:
- platform: template
sensors:
tank_level_percent:
entity_id: sensor.tank_level
# Tank empty at 23cm, full at 2cm, 21cm range of %
value_template: "{{100 + ((0.21 - ((states('sensor.tank_level'))|float - 0.02) / 0.21 * 1>
unit_of_measurement: '%'
friendly_name: Tank
icon_template: 'mdi:ruler'
Hope this helps 
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Hallo Corvy,
können Sie vielleicht ihr Build einmal komplett vorstellen (Code und Aufbau). Ich bin bereits 74 Jahre alt und nicht mehr ganz so fit, insbesondere mit Arduino da ich mich erst seit einiger Zeit damit beschäftige.
Anscheinend habe Sie eine Drahtlosversion erstellt, mit WiFi oder Blutooth. Das ist interessant wenn bei nachträglichen Einbau keine Möglichkeit der Kabelverlegung existiert.
Ich freune mich auf Ihre Veröffentlichung, bzw. auch per PN
Gruß
Winfried
Can you show the esphome code full?
I am struggling here trying to get this done
Sorry mate, I have since moved away from this setup and I no longer have this config.
Hold the phone! Found it!
esphome:
name: waste_tank_level
platform: ESP32
board: esp32doit-devkit-v1
wifi:
ssid: "wifissid"
password: "passord"
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Waste Tank Level"
password: "passord"
# Enable logging
logger:
# Enable Home Assistant API
api:
password: "enkeltpass"
ota:
password: "enkeltpass"
captive_portal:
sensor:
- platform: ultrasonic
trigger_pin: GPIO32
echo_pin: GPIO33
name: "Waste Tank Level"
update_interval: 5s
pulse_time: 10us
timeout: 20m
accuracy_decimals: 3
Not that this is a few years old so things might have changed.
Sure mate I will give a try, thnk you so much.
Yeah no success here with this code also.
I dont know what I am doing wrong here with A02YYUW PWM version.
Tried a lot of different codes 
I will open a topic maybe if someone could help me
Yeah, try that. Make sure all cables are connected well 
Good luck!
Hello Corvy. I have also connected ultrasonic sensors to know the volume of water stored in the motorhome with HA and ESPHome. How did you make the waterproofing between the tank and the sensor?
Thank you in advance Antonio Orduña
Please translate your post into English.
If I understand correct you wonder how I got waterproofing. I used a gasket of cork, please see the following images.
Thanks for the photographs and comment. In my case, the clean water tank, when it is 100%, will be against the upper surface and with the movement of the motorhome it could leak some water. I will have to look for an option for a waterproof cable gland, and have the A02YYUW sensor inside the tank so it would only have a possible water leak point.
And from what I have read in the post, you have used the PWM model, the reading is stable or has a lot of noise and variability. Any experience with the UART protocol?