WitMotion WT9011DCL with 040 Level
Measured by us and selectable in the app
Got a WitMotion WT9011DCL? Then you don't need a second piece of hardware. We measured its protocol ourselves on 2 September 2026 — 1494 packets across seven positions whose angle we knew in advance — and built it in as a data source. Of the three sensors we support, it's the best one technically.
- Measured on
- 09/02/2026
- Readings evaluated
- 1,494
- Radio name
- WT901BLE…
What we measured — and why we're showing you
The strongest piece of evidence is an unremarkable one: the magnitude of the acceleration stayed between 0.978 and 1.015 g in all seven positions. A sensor at rest feels exactly one gravity, whichever way it lies — the fact that the magnitude comes out as 1 g everywhere proves the scaling independently of any assumption about which axis points where. On top of that we checked each position: flat 0°/0°, on its long edge +87.4° roll, on its short edges ∓88.2° pitch, upside down −179.1°. Measuring the same position again two minutes later gave the same value.
What the device delivers
- Tilt
- Pitch and roll, roll across the full ±180° with no wrap-around
- Temperature
- No temperature — the device doesn't provide it
- Battery
- No battery level — the device doesn't provide it
- Data rate
- 10 readings per second, no command needed, right after power-on
What works
No pairing, no command
We listened passively and sent nothing: the sensor immediately delivered 100 packets in 10 seconds, exactly 10.0 Hz. The command frames documented in its manual aren't needed. Switching it on is enough.
Zero point is flat
Lying flat it reports 0.00° on both axes, so you can simply stick it down flat.
Raw data and rotation rates
It sends acceleration, rotation rate and finished angles in the same packet. That means the same motion smoothing we built for our own sensor applies — noticeably calmer readings while moving.
Roll across a full 180°
Upside down it reports −179.1°. There's no point where the value wraps around.
What does not work
No heading
Its heading drifted from −112° to +133° across our seven positions without the orientation changing accordingly. We don't use it — and you don't need it for levelling.
No temperature, no battery level
We read out the device's structure: it offers exactly one service with two characteristics. No battery service, no temperature — and neither is in the data packet. So we don't show those fields at all rather than printing an invented number.
Not every WitMotion model works
Only the BLE models: WT9011DCL and WT901BLECL. The BWT901CL is a Bluetooth 2.0 device, shows up as HC-06 and asks for a password — our app can't use it, and it won't work on iPhone at all.
No outdoor housing
The WT9011DCL is a developer board, not a weatherproof sensor. If it's going to live in your vehicle, you'll need a mount and a dry spot.
How to connect it
Switch the sensor on. The status LED blinks — once per second on the WT9011DCL when it's ready.
In the app, open the sensor picker and tap “Choose external sensor” under External sensors.
Tap “WitMotion WT9011DCL”. The scan starts and your device appears below it, with signal strength.
Tap it to connect. Tapping the brand row again deselects it and switches back to our sensor.
Mounting
How to find it if it doesn't show up
Over the air it does NOT announce its model name — it appears as “WT901BLE” plus the last digits of its device address. So two units look almost identical and can only be told apart by signal strength. And if the LED blinks continuously, it may already be connected to something else — close the manufacturer's app on every phone and switch it off and on again.
What it costs
Unlockable in the app.
Unlock for good or rent for a week — both are one-off payments, no subscription. The app shows you the current price incl. VAT before you buy. Permanent purchases are tied to your Apple ID or Google account.
We do not sell the sensor itself — you already own it. You only pay for the unlock; the app is free.
How we know
Measured on 2 September 2026 on a real device. We stood it in seven positions whose angle follows from geometry — the sensor is a box, and stood on one of its faces it is tilted exactly 90°. The app displayed the position with a countdown and recorded it alongside every packet, so the mapping from reading to position is measured rather than inferred from timestamps. All 1494 packets still run through our parser as a regression test.
A device only gets a page here once we have bought it and measured it ourselves. Anything we never held in our hands is not listed — not even when it looks technically similar.
Other sensors we measured
All trademarks belong to their respective owners. There is no cooperation with the manufacturers; the names are here only so you can tell which device is meant.