# TFSLOT01: Clogging-Free Airspeed Sensor for UAVs

An innovative Venturi-effect airspeed sensor with a 9-axis IMU and customizable design. Open-source and ideal for low-speed UAVs.

- **Seller:** [ThunderFly](https://lectronz.com/stores/thunderfly), Soběslav, Czechia
- **Price:** €312.90 (EUR, before shipping and taxes)
- **Availability:** In stock
- **Categories:** Sensors, I2C, Robotics
- **Product page:** https://lectronz.com/products/tfslot01-clogging-free-airspeed-sensor-for-uavs

## Options

**I2C JST-GH high-flexible silicone cable**

- Without cable
- TFCAB15I2C01: 15 cm I2C cable with JST-GH [Add €2.97]
- TFCAB30I2C01: 30 cm I2C cable with JST-GH [Add €3.47]
- TFCAB45I2C01: 45 cm I2C cable with JST-GH [Add €3.96]

## Links

- [Documentation](https://docs.thunderfly.cz/avionics/TFSLOT01/)
- [Design Files](https://github.com/ThunderFly-aerospace/TFSLOT01)

## Images

![TFSLOT01: Clogging-Free Airspeed Sensor for UAVs](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQ2NzcsInB1ciI6ImJsb2JfaWQifX0=--6f526272e882149a54971bf19ac89573458fa5da/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2024-12-18T10-3A24-3A23.721Z-TFSLOT_3.jpg)
![TFSLOT01: Clogging-Free Airspeed Sensor for UAVs](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQ2NzgsInB1ciI6ImJsb2JfaWQifX0=--875a715c36c07464e510ef4746b0a0d363bf511d/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2024-12-18T10-3A24-3A23.721Z-TFSLOT_1.jpg)
![TFSLOT01: Clogging-Free Airspeed Sensor for UAVs](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQ2NzksInB1ciI6ImJsb2JfaWQifX0=--04c313ac75301cab0a57f227390b7d316587970c/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2021-12-13T19-3A52-3A54.039Z-TFSLOT_compose.jpg)
![TFSLOT01: Clogging-Free Airspeed Sensor for UAVs](https://lectronz-images.b-cdn.net/lectronz/active_storage/representations/proxy/eyJfcmFpbHMiOnsiZGF0YSI6MzQ2ODAsInB1ciI6ImJsb2JfaWQifX0=--d8156fcebf3dbe5091206afa531c83bdb711f813/eyJfcmFpbHMiOnsiZGF0YSI6eyJmb3JtYXQiOiJqcGciLCJyZXNpemVfdG9fbGltaXQiOls5NjAsNjQwXSwic2F2ZXIiOnsic3RyaXAiOnRydWV9fSwicHVyIjoidmFyaWF0aW9uIn19--970c165836a83091725a1a0fd4f37ce9408da1bf/2021-12-13T19-3A52-3A54.039Z-TFSLOT_2.jpg)

## Description

The **TFSLOT01** is a next-generation airspeed sensor designed for UAVs. It uses the Venturi effect for superior performance at low airspeeds. This clog-resistant design is coupled with an integrated 9-axis IMU to be ready for additional diagnostic capabilities like vibration monitoring and angle-of-attack measurements.

This product is fully open-source, with a customizable 3D-printed case for seamless integration into UAV designs. Whether you're a developer, researcher, or enthusiast, the TFSLOT01 provides reliability, adaptability, and advanced functionality.

### Key Features

- **Clog-Resistant Design**: Venturi-based measurement removes stagnation point.
- **Integrated IMU**: Features a 9-axis IMU (magnetometer, accelerometer, gyroscope) for advanced diagnostics.
- **Customizable**: 3D-printed housing can be adapted to specific applications.
- **Weatherproof Build**: IP42-rated for reliable operation in diverse conditions.
- **Enhanced Resolution**: Optimized for speeds below 10 m/s.
- **Direct Integration**: No need for additional tubing, reducing maintenance concerns.

### Why Choose TFSLOT01?

The TFSLOT01 offers reliable airspeed measurement with its innovative Venturi-effect design, ensuring high accuracy and clog-free operation at low speeds. If you're looking for a lightweight and compact airspeed sensor based on the proven Pitot-static principle, check out our [TFPITOT01](https://lectronz.com/products/tfpitot01-lightweight-compact-pitot-tube-sensor). Designed for minimal weight and precise measurements, it’s an excellent choice for applications where every gram matters.  

### Technical Specifications

| **Parameter**          | **Value**            | **Description**                           |
|-------------------------|----------------------|-------------------------------------------|
| Airspeed Range          | 0 - 48 m/s          | Assumes air density of 1.29 kg/m³         |
| Dimensions              | 35 x 40 x 35 mm     | Default 3D-printed case                   |
| Weight                  | 25 g                | Compact and lightweight                   |
| Operating Temperature   | −20°C to +40°C      | Reliable in diverse weather              |
| Input Voltage           | +3.6V to +5.4V      | Overvoltage protection included           |
| I2C Connector           | 4-pin JST-GH        | Pixhawk-compatible standard               |
| Weather Resistance      | IP42                | Protection against dust and water splashes|


The sensor can operate at any altitude, but sensitivity decreases as air density drops. See the documentation for details.

### Compatibility

- **PX4 Autopilots**: Full airspeed and IMU integration.
- **Ardupilot**: Hardware-compatible (airspeed calculations require manual configuration).
- **Custom Systems**: Supports I2C interfaces.

Follow the [PX4 guide](https://docs.px4.io/main/en/sensor/airspeed_tfslot.html#tfslot-venturi-effect-airspeed-sensor) for setup.

### Included in the Package

- TFSLOT01 sensor (assembled and ready to use)
    - 3D-printed protective case
    - Sealing O-rings
    - Optional I2C cable

### Accessories

For enhanced reliability and flexibility, we offer high-quality [I2C cables](https://lectronz.com/products/tfcabxxi2c01-i2c-cable-for-pixhawk-drones), specially designed to minimize electromagnetic interference.

### Product Changelog

- **TFSLOT01C (2024)**: Enhanced mounting options for broader compatibility.
- **TFSLOT01B (2022)**: Upgraded electronics for better performance.
- **TFSLOT01A (2021)**: Initial prototype (not publicly released).

For full details, visit the [releases](https://github.com/ThunderFly-aerospace/TFSLOT01/releases).