2 layers30 × 15 mm
TFASPDIMU02
ThunderFly-aerospace/TFASPDIMU02
I²C bus differential pressure sensor with IMU and Magnetometer.
43 parts3GPL-3.0
2 layers36 × 14 mm
TFASPDIMU01
ThunderFly-aerospace/TFASPDIMU011SPI or I²C differential pressure sensor and IMU unit.
- Size
- 36 × 14 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 26
- Nets
- 35
- Pads
- 124
- Tracks, vias
- 344, 59
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 29 Oct 2020
- Updated
- 22 Feb 2026
Overview
TFASPDIMU01 is an open-source printed circuit board by ThunderFly-aerospace, from the ThunderFly-aerospace/TFASPDIMU01 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 36 × 14 mm with 26 parts on 35 nets, routed with 344 tracks and 59 vias.
It is built around the ICM-20948, MIC5504-1.8YM5-TR and MIC5504-3.3YM5-TR, with the TXS0108EPW and SM07B-GHS-TB among its other parts. Its parts include 11 capacitors, 8 resistors, 5 ICs, 1 diode and 1 connector. It belongs with the sensors and measurement boards of this library.
Main components
5
ICM-20948
QFN-24(3x3)-40℃~+85℃ 0.5KB 1.71V~3.6V 16bit 8uA Accelerometer Gyroscope SPI、I2C X,Y,Z X,Y,Z ±16g ±2000dps QFN-24(3x3) Accelerometers ROHSTDK InvenSenseAccelerometers
MIC5504-1.8YM5-TR
SOT-23-5-40℃~+125℃@(Tj) 1 1.8V 175uVrms 300mA 380mV@(300mA) 5.5V 55uA 60dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMicrochip TechnologyVoltage Regulators - Linear, Low Drop Out (LDO) RegulatorsMIC5504-3.3YM5-TR
SOT-23-5-40℃~+125℃@(Tj) 1 160mV@(300mA) 175uVrms 3.3V 300mA 38uA 5.5V 60dB@(1kHz) Fixed Over Current Protection Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMicrochip TechnologyVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TXS0108EPW
TSSOP-20-40℃~+85℃ 1 1.4V~3.6V 1.65V~5.5V 60Mbps 8 Automatic direction detection、Output enable high-impedance、Integrated pull-up resistor Bidirectional Level translator Push-Pull、Open-drain TSSOP-20 Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level Shifters
SM07B-GHS-TB
UncategorisedJST
README
README.mdTFASPDIMU01 - sdp3x differental pressure sensor and IMU 9-axis unit
ThunderFly TFASPDIMU01 is SPI/I2C sensor board equipped with a differential pressure sensor (Senserion SDP3x) and 9-axis motion tracking sensor (ICM-20948). Board is equipped with 7pin JST-GH connector. The sensor board is designed for multiple uses. It can be used as a self-adjusting anemometer WINDGAUGE03 or as an airspeed sensor for UAVs with optional function as the external magnetometer.
TFASPDIMU is commercially available from ThunderFly s.r.o., write an email to info@thunderfly.cz or shop at Tindie store.
Specification
- Type: Differential and 9-axis motion sensor board
- Mass: 3 g
- Size: 36 x 14 mm
- Power: +5 V
- Connection: 7pin JST-GH connector, custom pinout
SDP3x
- Range: +/- 125/500 Pa (depending on exact sensor type)
- Excellent accuracy and repeatability, even below one Pascal
- No zero-point offset, no temperature drift
- Calibrated and temperature compensated
- Fast sampling time of 2kHz at 16 bit resolution
- I2C address: 0x21 (d33)
ICM-20948
- 3-axis gyroscope, 3-axis accelerometer, 3-axis compass (magnetometer)
- Onboard Digital Motion Processor (DMP)
- On-Chip 16-bit ADCs and Programmable Filters
- 7 MHz SPI or 400 kHz Fast Mode I²C
- Digital temperature sensor
- Default I2C address: 0x68 (0d104), can be changed to 0x69 (0d105) by moving the resistor R2->R1.
Example of uses
WINDGUAGE01
Ground control station anemometer WINDGAUGE03
TFSLOT01 - UAV airspeed sensor
Our TFSLOT senzor is an airspeed sensor for use mainly on UAV. Due to 3D printed case it is possible to optimalize part according to the location of sensor on UAV and tune their characteristics. First use of this sensor was on our autogyro TF-G2.
More details about this solution is available in the repository TFSLOT01.
TFPIPE01 - UAV airspeed sensor
Symmetric variant of TFSLOT sensor for different mounting options TFPIPE01.
TFVENTUFO - omnidirectional anemometer
This anemometer should also based on venturi effect. Thanks to an clever design, it will measure the wind speed from all directions (without knowing the direction).
Angle of Attack sensor
In case of mounting on rotation slip-ring bearing the sensor could sense air AoA of the vehicle. Due to ability to turn in direction of airflow. The turnig direction could be sensed differentialy to position of aircraft by IMU embedded in the TFASPDIMU01 sensor.
Hardware
Eletronic schema
Full schema is avialible in PDF
Hardware layout
** IMG - technical draft **
Pinout
| Pin # | I2C | SPI |
|---|---|---|
| 1 | +5V | +5V |
| 2 | SCL | SCK |
| 3 | -- | MISO |
| 4 | SDA | MOSI |
| 5 | -- | CS |
| 6 | INT | INT |
| 7 | GND | GND |
Due to the possible wider use of the sensor, a standard pixhawk pinout is not used.
PixHawk autopilot cable
To increase the transmission quality, it is recommended to create pairs SDA,GND and SCL,+5V on the cable (as shown in image)
| TFASPDIMU01 Pin | Sigal | Pixhawk | Color |
|---|---|---|---|
| 1 | +5V | 1 | Red |
| 2 | SCL | 2 | Yellow |
| 4 | SDA | 3 | Green |
| 7 | GND | 4 | Black |
Pixhawk pinout is listed according to the Pixhawk connector standard.
Usage
Python
For reading data from the sensor, we have prepared a python script in PyMLAB library that uses the pySMBus to readout data. It can be used directly from a computer with a corresponding converter (for example MLAB USBI2C01A) or with one-board computers (Odroid, raspberry and similar) that have own smbus output.
Calibration vertification
Calibration can be verified by mounting of an anemometer to car roof and comparing it to speed obtained from GPS (gpsd). This needs to be done in windless weather.
PX4
We are now working on implementation of driver into PX4 stack.
Main usage of this sensor is as airspeed sensor. It can be also used as an external magnetometer and thermometer.
Ardupilot
We are currently unable to implement the sensor in the Ardupilot flight stack. However, we will be happy to provide assistance with implementation. You can contact us
configuration
TODO
Parts
26| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 100nF | Mlab_R:SMD-0603 | C1, C2, C3, C4, C9, C10 |
| 6 | 10k | Mlab_R:SMD-0603 | R4, R5, R6, R7, R8, R9 |
| 4 | 1uF | Mlab_R:SMD-0603 | C5, C6, C7, C8 |
| 1 | - | Mlab_R:SMD-0603 | R1 |
| 1 | 0R | Mlab_R:SMD-0603 | R2 |
| 1 | 10uF | Mlab_R:SMD-0805 | C11 |
| 1 | BZV55C-5,6V | Diode_SMD:D_MiniMELF | D1 |
| 1 | ICM-20948 | Sensor_Motion:InvenSense_QFN-24_3x3mm_P0.4mm | U2 |
| 1 | MIC5504-1.8YM5-TR | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | MIC5504-3.3YM5-TR | Package_TO_SOT_SMD:SOT-23-5 | U4 |
| 1 | SDP3x | Mlab_IO:SDP3x | U1 |
| 1 | SM07B-GHS-TB | Connector_JST:JST_GH_SM07B-GHS-TB_1x07-1MP_P1.25mm_Horizontal | J1 |
| 1 | TXS0108EPW | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U6 |
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Questions
How big is the TFASPDIMU01 PCB?
It measures 36 × 14 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TFASPDIMU01 use?
26 parts, built around the ICM-20948, MIC5504-1.8YM5-TR, MIC5504-3.3YM5-TR and TXS0108EPW. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the TFASPDIMU01 KiCad files?
From the ThunderFly-aerospace/TFASPDIMU01 repository on GitHub, at the commit this page was made from: the board is hw/sch_pcb/TFASPDIMU01.kicad_pcb and its schematic hw/sch_pcb/TFASPDIMU01.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TFASPDIMU01 design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).