DroneCAN Airspeed Sensor Guide: DLVR vs MS4525 vs MS5525
For PX4 and ArduPilot fixed-wing and VTOL builds, the Holybro DroneCAN Airspeed Sensor with DLVR is the modern default: better than 1% accuracy, up to 320 km/h measurement range, auto-configuration over the CAN bus and a single 4-pin cable instead of long I2C runs. The classic I2C sensors still make sense, though — the MS4525DO, AS1318C and MS5525DSO cost half as much ($59.99 vs $109), weigh 2.6–4.1 g versus 17.4 g, and draw only 1.4–3 mA against the DLVR’s ~100 mA. This guide decodes Holybro’s own comparison chart so you can pick the right sensor for your airframe, autopilot and mission profile.
Why Airspeed Data Matters on Fixed-Wing and VTOL Drones
A multirotor flies from GPS velocity alone, but a plane or VTOL that stalls at low speed and overspeeds at high speed needs to know how fast air is moving over the wing. The airspeed sensor measures differential pressure between a pitot tube facing forward and a static port, and the autopilot uses that reading to control throttle, cruise speed and stall margins. Bad airspeed data is one of the classic causes of fixed-wing crashes on autopilot: an offset introduced by a long sensor cable, a drifting zero point or temperature-induced error can make the controller believe the aircraft is flying faster or slower than it really is. That is precisely why Holybro’s newer designs moved from analog-style I2C outputs to fully digital sensors with temperature compensation — and, on the DroneCAN DLVR, to a noise-immune bus protocol.
The Four Sensors Compared: Full Spec Table
Holybro publishes one comparison chart covering the DLVR (two variants) and three standard-precision I2C sensors. Here is that data, complete:
| Spec | DLVR-L10D | DLVR-L20D | AS1318C / MS4525DO | MS5525DSO |
|---|---|---|---|---|
| Interface | DroneCAN | DroneCAN | I2C (0x28H) | I2C (0x76) |
| Standard range (psi) | 0.363 | 0.725 | 1 | 1 |
| Total error band | ±0.3% Span | ±1% FSS | ±1% FSS | ±2.5% FSS |
| Max airspeed (kph) | 226.8 | 320 | 360 | 360 |
| Compensated temp (°C) | 0~70 | 0~60 | -10~85 / 0~85 | 0~85 |
| Operating temp (°C) | -25~85 | -20~85 | -25~105 | -40~125 |
| Update time (ms) | 0.4~9.5 | 0.5 | 0.5 | 0.48~9.04 |
| Current (mA) | ~100 | ~100 | ~3 | ~1.4 |
| Module weight (g) | 17.4 | 17.4 | 4.1 | 2.6 |
Three numbers decide most purchases. First, the error band: the DLVR-L10D’s ±0.3% of span is the tightest figure in the lineup — roughly three times tighter than the ±2.5% FSS of the MS5525DSO. Second, the interface: only the DLVR variants run DroneCAN; the other three speak I2C at fixed addresses (0x28H or 0x76). Third, weight: the DLVR module is 17.4 g on its own — 38.3 g with the pitot tube and tubing — while the I2C modules weigh 2.6–4.1 g.
What the DroneCAN DLVR Adds Over I2C
The DLVR sensor itself is an ALLSENSORS part built on CoBeam technology, chosen for high precision and low temperature drift. But the bigger difference is the packaging. The module runs ArduPilot AP-Periph DroneCAN firmware on an STM32G473CE microcontroller (170 MHz, 128KB RAM, 512KB Flash), so it appears on the CAN bus with automatic configuration — no I2C address juggling, and no analog-style noise induced by long cable runs, which the standard sensors’ documentation explicitly warns about. A software toggle handles CAN termination resistance, and the aluminum shell is rated for -20 to 85 °C operation. Any flight controller with a CAN interface running PX4 or ArduPilot works, including the Pixhawk 6C Mini, and setup is documented in Holybro’s quick-start guide. The trade-offs are the ~100 mA current draw, the 17.4 g module weight and the $109 price — all paid for industrial-grade accuracy of better than 1% across a wide temperature range.
Choosing Between DLVR-L10D and DLVR-L20D
The DroneCAN sensor ships in two pressure ranges, and the choice maps directly to your aircraft’s speed envelope. The L10D covers 0–2500 Pa, translating to 0–226.8 km/h (141 mph) airspeed with a 75 kPa burst rating — the right pick for slow cruisers, training planes and long-endurance mappers. The L20D extends to 5000 Pa and 320 km/h (200 mph) with a 125 kPa burst rating, for faster airframes and high-speed VTOL transitions. Both carry the same ±0.3%-span-class precision story at the sensor level, the same DroneCAN interface and the same 14-bit pressure resolution with 11-bit temperature resolution. Buy the range that matches your fastest normal flight — do not pay for 320 km/h headroom a 60 km/h survey plane will never use.
When a Standard I2C Sensor Is Still the Better Buy
For most hobby and light-commercial builds, the $59.99 standard-precision kit delivers everything the flight controller needs. All three I2C sensors come with temperature compensation, and the measurement approach is smart: the module reads temperature to convert indicated airspeed into true airspeed using the static pressure sensor already on the flight controller, and because it sits far from heat-producing processors, the temperature reading stays close to ambient. Supported on all Holybro and Pixhawk flight controllers with ArduPilot and PX4, they mount via standard M3 or 6-32 holes. Within the trio, the differences are subtle: the AS1318C and MS4525DO share ±1% FSS accuracy and a 1 psi range with a wider -10~85 °C compensated window on the AS1318C, while the MS5525DSO trades accuracy (±2.5% FSS) for 24-bit resolution, ~1.4 mA consumption, 2.6 g weight and an extreme -40~125 °C operating envelope. Wing builds that already run a wing-specific controller like the Kakute F405-Wing Mini are exactly where these lightweight I2C modules shine — and our fixed-wing build guide shows how one fits into a complete airframe.
Pitot Tubes and Kits: PT40 vs PT60
Sensor accuracy means little without a correctly sized pitot tube, and both product families ship accordingly. The DroneCAN DLVR is offered in three kits: sensor only, with a PT40 pitot tube, or with a PT60 — each including 100 cm of rubber tubing and a GH 4P cable. The standard-precision family follows the same logic with 40 cm tubing on the MS4525/AS1318C kits and 100 cm on the MS5525DSO kit, plus standalone PT40 and PT60 tubes if you need a replacement. Match the tube to the airframe nose: a longer PT60 suits larger fuselages where the sensor sits further from clean airflow, while the PT40 keeps wiring short on compact planes.
Frequently Asked Questions
Which airspeed sensor should I choose for PX4 or ArduPilot?
If your flight controller has a spare CAN port and the budget allows $109, the DroneCAN DLVR is the strongest option: better than 1% accuracy, automatic bus configuration and immunity to cable-induced noise. If you fly a lighter budget build or need to save every gram, the $59.99 I2C kit — MS4525DO or AS1318C for balanced specs, MS5525DSO for minimal weight and current — is fully supported on all Pixhawk and Holybro controllers with both firmware stacks.
What is the difference between DLVR-L10D and DLVR-L20D?
Pressure range and speed ceiling. The L10D measures up to 2500 Pa, equal to 226.8 km/h airspeed, with a 75 kPa burst pressure; the L20D doubles that to 5000 Pa and 320 km/h with a 125 kPa burst rating. Everything else — DroneCAN interface, 14-bit pressure resolution, ~100 mA draw and module construction — is identical, so pick strictly by your airframe’s top speed.
Why is DroneCAN more reliable than I2C for airspeed sensors?
I2C was designed for short on-board links, and on airframes the sensor often sits a meter or more from the autopilot, where cable capacitance and motor-induced electrical noise corrupt readings — Holybro’s own documentation notes the classic sensors do not suffer from “noise induced by long cables” only in their digital differential design, while the bus itself remains sensitive. DroneCAN wraps the data in a differential bus protocol with CRC checking and automatic node configuration, so the sensor self-registers on the bus and the flight controller receives validated messages.
How much airspeed range do I actually need?
Size the sensor to your fastest normal cruise plus margin, not your theoretical dive speed. A mapping plane cruising at 60–90 km/h fits comfortably in the DLVR-L10D’s 226.8 km/h ceiling; a fast VTOL or racing wing approaching 250–320 km/h needs the L20D or an I2C 1 psi sensor rated to 360 km/h. Excess range costs resolution where you actually fly, since the 1 psi full-scale devices spread their 14 bits over a wider pressure span.
Does the DLVR include a pitot tube?
It depends on the SKU: the base package contains the sensor module, 100 cm of rubber tubing and a GH 4P cable, while two other bundles add either a PT40 or a PT60 pitot tube. The standard-precision kits include the sensor and tubing, with PT40 and PT60 tubes available separately. Budget for the tube up front — the sensor cannot measure airspeed without one.
The Bottom Line
Holybro’s airspeed lineup splits cleanly: the DroneCAN DLVR for industrial-grade accuracy, CAN-bus reliability and 320 km/h headroom at $109, and the $59.99 I2C family for builds where 4 g of weight and 3 mA of current matter more than ±0.3% of span. Both are plug-and-play on PX4 and ArduPilot. Add the right pitot tube, mount it clear of prop wash, and your fixed wing or VTOL will fly its autopilot missions on trustworthy airspeed data.