No EFIS (Standalone Operation)¶
OnSpeed works without an EFIS connection. In standalone mode, the system relies entirely on its own sensors for flight data.
What Works Without EFIS¶
- AOA measurement — the pressure sensors and IMU provide AOA data independently
- IAS computation — from the onboard pitot pressure sensor
- Altitude — from the static pressure sensor (Kalman filtered)
- Audio tones — fully functional
- SD card logging — all OnSpeed sensor data is logged
- WiFi configuration — fully functional
- Calibration wizard — works using OnSpeed's own sensors
What You Lose¶
| Feature | Impact |
|---|---|
| EFIS IAS | OnSpeed uses its own pitot sensor. Still accurate, but not cross-checked against your primary ASI. |
| EFIS OAT | No temperature data unless you install a DS18B20 sensor. Affects TAS and density altitude corrections. |
| EFIS attitude | OnSpeed uses its own IMU + AHRS. Works well, but not cross-checked. |
| Engine data | No RPM, MAP, fuel flow, or percent power in logs |
| Percent Lift | No Dynon/Garmin AOA percentage for cross-calibration |
When to Add a DS18B20 OAT Sensor¶
If you're running standalone, you should install a DS18B20 OAT sensor. Without OAT data, OnSpeed can't compute accurate TAS or density altitude, which affects the accuracy of flight path angle calculations.
The DS18B20 is inexpensive and easy to install — it's strongly recommended for standalone installations.
Configuration for Standalone¶
- Connect to OnSpeed WiFi
- Set EFIS Type to
None - Set OAT Sensor to
Enabled(if you installed a DS18B20) - Set Serial EFIS Data to
Disabled - Save and reboot
Calibration in Standalone Mode¶
The calibration wizard works in standalone mode using OnSpeed's own IAS and attitude data. Set the Calibration Source to ONSPEED (not EFIS) in the calibration wizard.
The calibration quality may be slightly lower without EFIS cross-reference data, but it is fully functional for normal operations.