Ultra stable 3-axis gyro based on the L3GD20

The STEVAL-MKI127V1 demonstration board represents an ultra stable 3-axis gyroscope application based on MEMS technology, offering high quality and performance at a low price. Utilizing ST’s L3GD20 low-power 3-axis angular rate sensor and ARM Cortex-M3 processor, it offers users an unprecedented level of fine tuning/programming to meet the needs of professionals and hobbyists alike. It is ideal for any number of UAV, conventional aircraft, platform stabilization (such as camera mounts), or general robotics projects, as well as providing optimal performance for competitive RC airplane and recreational flying.

The STEVAL-MKI127V1 was designed by Bluelight Technologies Co. Ltd.

For the complete user manual and PC tools (intuitive, easy-to-use software for detailed user programming and graphical real-time data monitoring), download from:


Key Features

  • USB / PC connection for setup and upgrade (USB and/or UART connection)
  • Ultra stable over temperature and time
  • Operational temperature: -30 °C to +85 °C
  • ST L3GD20 MEMS rate sensor
  • ARM Cortex-M3 processor for control and I/O
  • UART connection for system developers
  • Filters:
    • Low pass
    • High pass (programmable)
    • Kalman (programmable)
    • Rolling average (programmable)
  • Control algorithm:
    • PID (proportional, integrative, differential)
    • All gain parameters programmable (+3 external pots)
  • Input Tx/Rx matching:
    • Matching to any RC transmitter
    • Allows a low cost system with high end features
  • Curves (input stick curves):
    • Many standard and also x4 use programmable
    • Good for aircraft control at low cost
  • Mixing functions / trim:
    • Pitch into roll for “Wing” aircraft
    • Power in and out (for curve transformation)
    • Trim and range adjustments for fine tuning
  • 3 PWM inputs and 6 outputs for control signals:
    • Pitch
    • Roll
    • Yaw
  • 1 x UART for 16-bit raw X, Y, Z rate and 8-bit temperature digital data out and PC connection
  • Highly programmable for multiple applications
  • Variable input voltage (20 V to 5 V, or down to 3.3 V)
  • LED displays to show gyro operation
  • Factory calibrated
  • Size, power and weight
    • 35 x 35 mm PCB
    • 45 mA during normal operation
    • Weight: 8.5 g
  • RoHS compliant




Technical Documentation

Product Specifications
Description Version Size
DB1769 DB1769: Ultra stable 3-axis gyro based on L3GD20 1.0 221 KB

Hardware Resources

Bill of Materials
Description Version Size
Schematic Pack
Description Version Size
STEVAL-MKI127V1 gerber files 1.0 142 KB


License Agreement
Description Version Size
Evaluation products license agreement 1.4 128 KB
Support & Community

Sample & Buy

Part Number Core Product Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STEVAL-MKI127V1 NRNDCARDIndustrialEcopack2

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.