Need advice on Water tank level monitoring

deanfourie · January 16, 2025, 9:44pm

thanks ill try that.

Do I connect level sensor to the ANALOG port of the Uni?

Patraff · January 16, 2025, 9:53pm

Data for my sensor

deanfourie · January 16, 2025, 9:59pm

What does yours output? 0-5v?

Patraff · January 16, 2025, 10:22pm

Here are the specs for mine.
Model Number : QDY30A
Origin : Mainland China
Model Number : QDY30A
Range : 0-500m
output : 4-20mA, ,0-10V
Power supply : DC24V,12-36VDC
Working temperature : -20-55
Accuracy : 0.2%FS ,0.5%FS
Cable lenth : 1m/2m/3m/5m/10m/15m/20m/30m
Material : 304/316 Stainless Steel
Protection : IP68
Response Time : 1ms (up to 90%FS)

deanfourie · January 16, 2025, 10:25pm

I think you will find it will do one or the other.

output : 4-20mA, ,0-10V

Patraff · January 16, 2025, 10:27pm

My shelly is set for adc range 12v

deanfourie · January 16, 2025, 10:28pm

Damn ok that’s high. I’m sure mine will be find I guess the shelly just works it out.

Patraff · January 16, 2025, 10:29pm

Yep I originally had it set for 24v and the values didn’t really change when back to 12v. As much as i read the shelly website as soon as they dived into techy talk they lost me

Patraff · January 16, 2025, 10:30pm

Maybe if yours is a 5v range you may need resistor to bring it up? I guess you can bench test to see if the shelly reads it ok first

deanfourie · January 16, 2025, 10:32pm

Yea, it says it has a large range supported for the ADC.

DM-AU · January 17, 2025, 12:49am

I used the following in a template helper for my %.

{% set voltage = states(‘sensor.water_tank_sensor_adc’) | float %} {{ float ((voltage / 7.64) | float * 100 ) | round(0) }}

The 7.64 is the voltage when the tank is 100% full.

deanfourie · January 17, 2025, 11:45pm

I’m not sure what’s going on, but this is all the entities I see, of which none are providing me with the data I need.

I’ve also enabled all disabled entities in HA.

Patraff · January 18, 2025, 12:42am

Can you show your connection layout?

Patraff · January 18, 2025, 12:43am

Is your level sensor two or three wire?

deanfourie · January 18, 2025, 9:30am

Its a 3wire sensor.

Connected like this.

deanfourie · January 18, 2025, 9:38am

The interesting thing is that there is an option in Shell Web UI to add a peripheral,

One of the options is a Voltage Meter?

bernieq · January 18, 2025, 11:12am

I notice no-one is including compensation for changing air presure.

A quick calculation suggests a potential variation due to changing air pressure of up to 50cm. (pressure at 1m depth = 100 hPa. Air pressure could vary between (say) 980 & 1030 (ie a range of 50 hPa)). 50hPa = 50cm.

So changing air pressure is significant. If you have an air pressure sensor (eg BMP280, ESP), compensation is just adding P_a - P_c to the calculated depth (in cm).

Note P_a actual air pressure
P_c air pressure at time of calibration
Compensation value is in cm - adjust to same units as your depth.

Patraff · January 18, 2025, 8:53pm

There are two wires that should connect to ground. On mine it is the green wire.

deanfourie · January 18, 2025, 9:34pm

I am using the “Voltage Output” version here.

If I measure the voltage between the data (yellow) and ground, I get 1.3v (tank is quite empty).

How ever, I cannot get the Shelly to read the voltage at all.

I have tried with my Yellow Data wire to the Blue (data) and the Grey (analog IN) cable on Shelly Uni

deanfourie · January 18, 2025, 11:56pm

Now, since updating to the latest version (v1.4.4) the device will not connect to my IoT WiFi, had no issues whatsoever on the previous firmware.

These Shelly devices are absolute crap.