Category Archives: Sensors

RPM Head Speed

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OpenTX The head speed of a helicopter is the revolutions per minute of the main rotor. The OpenTX RPM sensor has two fields that will help calculate the head speed: Blades Set Blades = Number of Main Gear Teeth Blades acts as a divider. The sensor data received is divided… Read more »

RPM – Setup

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OpenTX Sensor FrSKY RPM Sensor (USA World) Displays RPM (Revolutions Per Minute) Motor Details Determine the number of magnetic poles (blades in OpenTX) Emax MT1806-2280KV Framework 12N14P 14P = 14 Magnets = 7 Pole Pairs = 7 blades in OpenTX Note the KV 2280 revolutions per minute per volt Setup… Read more »

GPS Using Two Sensors

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Taranis OpenTX OpenTX allows the use of two GPS sensors at the same time. One can be on the model and the other could be in the transmitter’s module bay. Sensors FrSKY GPS Steps Change the ID of one of the two GPS sensors FrSKY Sensor ID Changer Connect one… Read more »

GPS In The Module Bay

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Taranis OpenTX OpenTX has the ability to use a GPS sensor installed in the Taranis external module bay. Sensor FrSKY GPS (USA World) Steps Modify a servo cable Switch the positions of the +ve and -ve wires on one end Plug one end of the cable into the pins of… Read more »

GPS 2D Distance & 3D Range

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OpenTX Calculated sensors take values from real sensors and output data based on calculations using data from those sensors. Displays Distance on the ground Range accounting for altitude above the ground Formula Distance The distance formula uses the initial and current GPS positions to calculate the distance. A variation of distance is… Read more »

GPS Altitude Relative To Ground

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OpenTX Displays Altitude above field Auto Offset Altitude sensors usually return a value relative to sea level. If you want the model’s altitude relative to where it took off from an offset needs to be calculated. OpenTX provides a way to do this automatically. Sensor Altitude sensor Setup Turn on… Read more »

GPS – Setup

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OpenTX Sensor FrSKY GPS (USA World) Displays Speed mph, kmh, ft/s, m/s, knots Latitude & Longitude degrees, minutes, seconds, decimal Altitude Date & Time Setup Connection diagram GPS Turn on Tx Power up Rx with sensor connected Press MENU Long press PAGE If GSpd, GPS and GALT are not visible scroll down (-) until… Read more »

Current mAh Consumption

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OpenTX Calculated sensors take values from real sensors and output data based on calculations using data from those sensors. The consumption calculation can be used to determine the mAh (mili Amp hours) used. mAh is a unit of electrical energy similar to litres and gallons which are units of fluid… Read more »

Current – Setup (FAS40S)

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OpenTX Sensor FrSKY Current Sensor (USA World) Displays LiPo Voltage V Current mA Setup Connection diagram FAS40S Turn on Tx Power up Rx with sensor connected Press MENU Long press PAGE Repeat till the TELEMETRY screen is displayed Select “Discover new sensors” Press ENTER New sensors will be added to the… Read more »