iStartek meiligao VT900 ultrasonic fuel temperature sender & temperature sensor

Hi All,

I use the istartek vt900 GPS tracker and it works great.

I am looking to use their accessories, in particular:

• utlrasonic fuel level sensor/sender (monitoring fuel level)
• cabin temperature monitoring sensor (think food/cold storage)

Does anyone have any experience using these sensors with Traccar?
Do they work?
Will fuel level appear as an attribute, in either decimal or percentage?
Will temperature appear as an attribute, in either decimal or percentage?

So far I have the below working:
IN1 - Hood/door open detection pin switch (working)
IN2 - Temperature Sensor (working)
IN3 - Ignition Detection
AD1 - 0

I am not getting any data from the ultrasonic temperature sensor, but I believe it's a problem with the sensor itself.

Will report back with the results.

The ultrasonic fuel sensor i am using is UL212 and comes with an Android app.

I have installed the ultrasonic fuel sensor underneath a plastic tub, then checked the UL212 app which shows the height correctly.

Traccar does not appear to have any data coming through for this ultrasonic fuel sensor.

UL212 App data:

The test setup with a bucket + ultrasonic fuel sensor mounted at botom

Traccar state section, no data coming in for fuel sensor.

VT900 LNS firmware applied. Fuel/ADC1 Data is now sent to the server.
VT900_L_V1.93_D4_20210513(1).Bin is the working firmware.

Next step is to figure out how to use this ADC1 data to calculate fuel.

It appears to just work. ADC1 value showing the fuel level in what I believe is litres. No changes were made within traccar.

Corrected DriverLicense attribute.

DriverLicense can be hidden.

Note: VT900 requires custom firmware and wiring modification performed by the factory for this configuration.