node-red-contrib-fft

Node to convert one or more values within an array, using fourier transformation fft.

example :

$3

``json
{ "data" : [
{"accelerometer_x" : 9 , "accelerometer_y":2, "accelerometer_z":2},
{"accelerometer_x" : 7 , "accelerometer_y":2, "accelerometer_z":2},
{"accelerometer_x" : 5 , "accelerometer_y":0, "accelerometer_z":0},
{"accelerometer_x" : 7 , "accelerometer_y":2, "accelerometer_z":2}
]}

`


$3

input : msg.payload.data
fields : accelerometer_x,accelerometer_y,accelerometer_z
prefix : fft_
type : real

$3


`json
{
"payload" :
{ "fft_accelerometer_x_0": 28,
"fft_accelerometer_x_1": 4,
"fft_accelerometer_x_2": 0,
"fft_accelerometer_x_3": 4,
"fft_accelerometer_y_0": 6,
"fft_accelerometer_y_1": 2,
"fft_accelerometer_y_2": 2,
"fft_accelerometer_y_3": 2
"fft_accelerometer_z_0": 6,
"fft_accelerometer_z_1": 2,
"fft_accelerometer_z_2": 2,
"fft_accelerometer_z_3": 2
}
}
``

to do

- add option multiple input for fields in place of comma seperated list
- handle fields from the array not used for transformation
- add other output templates
- support complex transformation

link