Configuration Parameters Reference

Complete reference of all OnSpeed configuration parameters. Configuration is stored as XML (config.cfg).

General Settings

XML Tag	Type	Default	Description
AOA_SMOOTHING	int	20	EMA filter window for AOA (samples)
PRESSURE_SMOOTHING	int	15	EMA filter window for pressure sensors (samples)
DATASOURCE	string	SENSORS	Data source: SENSORS, TESTPOT, RANGESWEEP, REPLAYLOGFILE
REPLAYLOGFILENAME	string	log.csv	Log file to replay when DATASOURCE=REPLAYLOGFILE
SDLOGGING	bool	true	Enable SD card data logging
CALWIZ_SOURCE	string	ONSPEED	Calibration wizard IAS source: ONSPEED or EFIS
AHRS_ALGORITHM	int	0	AHRS algorithm: 0=Madgwick, 1=EKF6

EFIS Settings

XML Tag	Type	Default	Description
EFISTYPE	string	VN-300	EFIS type: VN-300, ADVANCED, DYNOND10, GARMING5, GARMING3X, MGL
SERIALEFISDATA	bool	true	Enable reading EFIS serial data
SERIALOUTFORMAT	string	ONSPEED	Display serial output: ONSPEED or G3X

Orientation

XML Path	Type	Default	Options
ORIENTATION > PORTS	string	FORWARD	FORWARD, AFT, UP, DOWN, LEFT, RIGHT
ORIENTATION > BOX_TOP	string	UP	UP, DOWN, LEFT, RIGHT

Volume & Audio

XML Path	Type	Default	Description
VOLUME > ENABLED	bool	true	Use hardware volume potentiometer
VOLUME > HIGH_ANALOG	int	339	ADC value at max volume
VOLUME > LOW_ANALOG	int	170	ADC value at min volume
VOLUME > DEFAULT	int	100	Default volume (0–100%) when pot disabled
VOLUME > ENABLE_3DAUDIO	bool	true	Enable stereo lateral-G panning
VOLUME > MUTE_UNDER_IAS	int	25	Mute audio below this IAS (knots)
OVERGWARNING	bool	true	Enable G-limit warning tone

Vno Chime

XML Path	Type	Default	Description
VNO > SPEED	int	157	Vno speed threshold (knots)
VNO > CHIME_INTERVAL	int	3	Chime repeat interval (seconds)
VNO > CHIME_ENABLED	bool	true	Enable Vno overspeed chime

Load Limits

XML Path	Type	Default	Description
LOAD_LIMIT > POSITIVE	float	4.0	Maximum positive G-load
LOAD_LIMIT > NEGATIVE	float	-2.0	Maximum negative G-load

Sensor Biases

XML Path	Type	Default	Description
BIAS > PFWD	int	8192	Pitot pressure 14-bit count zero bias
BIAS > P45	int	8192	AOA pressure 14-bit count zero bias
BIAS > PSTATIC	float	0.0	Static pressure offset (PSI)
BIAS > GX	float	0.0	Forward acceleration bias (G)
BIAS > GY	float	0.0	Lateral acceleration bias (G)
BIAS > GZ	float	0.0	Vertical acceleration bias (G)
BIAS > PITCH	float	0.0	Pitch angle bias (degrees)
BIAS > ROLL	float	0.0	Roll angle bias (degrees)

CAS Curve (Airspeed Calibration)

XML Path	Type	Default	Description
CAS_CURVE > TYPE	int	1	Curve type: 1=polynomial
CAS_CURVE > X3	float	0.0	Cubic coefficient
CAS_CURVE > X2	float	0.0	Quadratic coefficient
CAS_CURVE > X1	float	1.0	Linear coefficient (1.0 = pass-through)
CAS_CURVE > X0	float	0.0	Constant coefficient
CAS_CURVE > ENABLED	bool	false	Apply CAS correction

Optional Features

XML Tag	Type	Default	Description
BOOM	bool	true	Enable boom probe serial input
BOOMCHECKSUM	bool	true	Validate boom data checksums
OATSENSOR	bool	false	Enable DS18B20 OAT sensor

Aircraft Parameters

XML Path	Type	Default	Description
AIRCRAFT > GROSS_WEIGHT	float	2282	Aircraft weight (lbs)
AIRCRAFT > BEST_GLIDE_IAS	float	87.5	Best glide speed (knots)
AIRCRAFT > VFE	float	150	Max flaps-extended speed (knots)
AIRCRAFT > G_LIMIT	float	3.5	Structural G-limit

Per-Flap Position Settings

Each FLAP_POSITION element contains:

XML Path	Type	Description
DEGREES	int	Flap deflection angle
POT_VALUE	int	ADC reading for this position
LDMAXAOA	float	Best L/D angle of attack (degrees)
ONSPEEDFASTAOA	float	Fast approach AOA (degrees)
ONSPEEDSLOWAOA	float	Slow approach AOA (degrees)
STALLWARNAOA	float	Stall warning threshold AOA (degrees)
STALLAOA	float	Actual stall AOA from calibration (degrees)
MANAOA	float	Maneuvering speed AOA (degrees)
ALPHA0	float	Zero-lift angle from physics fit (degrees)
ALPHASTALL	float	Stall angle from physics fit (degrees)

Per-Flap AOA Curve

XML Path	Type	Description
AOA_CURVE > TYPE	int	1=polynomial, 2=logarithmic, 3=exponential
AOA_CURVE > X3	float	Cubic coefficient
AOA_CURVE > X2	float	Quadratic coefficient
AOA_CURVE > X1	float	Linear coefficient
AOA_CURVE > X0	float	Constant coefficient