Taranis Q X7 OpenTX FrSKY RPM Sensor

Taranis Q X7 OpenTX FrSKY RPM Sensor
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# OpenTX Taranis Q X7 FrSKY RPM Sensor (Electric Brushless)
Welcome to another video from RCdiy.ca
This video will cover using an Electric Brushless Motor RPM sensor with OpenTX.
It is also accompanied by separate detailed documentation.
Please read the documentation for details on what I will be showing you.
A link to the documentation will be placed in the description below this video.
Links to blog post in the description below
To use this RPM sensor determine the number of magnetic poles pairs on the motor.
The motor being used is an M. T. 1806 2280KV by E Max.
The E Max website lists the framework specification as 12N 14P.
This means it has 14 magnets which is 7 pole pairs.
This number, seven, will be used to configure the sensor in OpenTX.
Also note the KV of the motor which is 2280.
This number will be used to verify the RPM measurements.
The RPM sensor does its measurements by sensing the voltage on any two of the three motor wires.
The sensor sends its measurements using the S Port to the receiver.
Connect the sensor and remover the propeller.
Power on the receiver with the throttle all the way down.
Observe the LED that flashes on the sensor.
Only the zero LED shown here should flash.
This is usually the default setting for the sensor.
The documentation linked to in the description below this video has details on how to set this led.
On the transmitter press menu
Long press page
Scroll down to discover new sensors, press enter
New sensors will be discovered,
Select “Stop discovery” and press ENT
Scroll up and select the “RPM” sensor
Long press ENT
Select “Edit”, press ENT
Scroll down and select “Blades”
Select the number 7
7 magnet pairs = 14 magnets = 14P
Press ENT
Press EXIT
Press EXIT again
With propeller removed increase the throttle
Observe RPM values change
The RPM sensor is reading about 7878
Using a laser tachometer we get 7878 as well
Another way to verify the RPM sensor reading is to use the battery voltage and motor KV number.
Increase throttle to maximum
Note the RPM which is 24458rpm in this example
Note the battery voltage which is A2 11.3V in this example
If A2 is not present use a voltmeter attached to the battery to get the voltage at the RPM being measured
Multiply the KV with battery voltage
2280 x 11.3 = 25,764 rpm (theoretical)
The theoretical RPM 25,764 is close to the sensor RPM 24,458
In this example there is a 5% difference
This brings us to the end of this video.
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