The Variometer sensor calculates the altitude from atmospheric pressure. Atmospheric pressure will get lower as you go up in altitude, using this the sensor will estimate the altitude. An exact display cannot be performed if atmospheric if atmospheric pressure changes in weather. The Variometer sensor also can output the Altitude Rate via DA port. Altitude Rate formula: (Output DA Voltage - C1.65)/1.65= Altitude Rate speed/10.24.
There are two versions for the variometer sensors, one is normal precision, another is high precision.
This is the normal precision version.
Variometer Sensor for FrSky Telemetry System - Normal Precision
Measures: -700 to 10000m with 1m resolution (resolution for high precision version is 0.1m) Operational voltage: DC4-10V Operational Current: 30mA Dimensions: 31.1 x 18.3 x 6mm (L x W x H) Weight: 3.1g Unites: Metric or British units
Includes: 1 x variometer sensor (normal precision)
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