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node-red-flow-fft-analysis.json
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node-red-flow-fft-analysis.json
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[
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"id": "795cdb52bbd4eb23",
"type": "tab",
"label": "Type 80 FFT",
"disabled": false,
"info": "",
"env": []
},
{
"id": "4c6816e9d6fe181b",
"type": "tab",
"label": "Setup Gateway",
"disabled": false,
"info": "",
"env": []
},
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"type": "function",
"z": "795cdb52bbd4eb23",
"name": "FFT Converter",
"func": "var fft = context.global.get('fft');\nvar fftUtil = context.global.get('fftUtil');\n\n// Convert msg.payload.data into an array for easier manipulation\nlet readings = Object.values(msg.payload.data);\n\n// Ensure the number of readings has a number of values equal to\n// the logarithmic root of 2\nlet log2_readings = 2 ** Math.floor(Math.log2(readings.length));\n\n\n// Reduce the size of the reading array to discard unused values\nreadings = readings.slice(0, log2_readings);\n\n// Instantiate per axis readings\nvar x_readings = [];\nvar y_readings = [];\nvar z_readings = [];\n// Loop through each reading to split into axis\nfor(let reading in readings){\n x_readings[reading] = readings[reading]['x'];\n y_readings[reading] = readings[reading]['y'];\n z_readings[reading] = readings[reading]['z'];\n}\n\n\n// Calculate frequency based on number of readings and ODR\nlet fft_frequency = fftUtil.fftFreq(readings, msg.payload.odr);\n\n// Calculate the X axis FFT data fft returns real and imaginary numbers so we will split them later\nlet fft_x_data = fft(x_readings);\nlet fft_x_magnitude = fftUtil.fftMag(fft_x_data);\n// Split the real and imaginary values\nlet fft_x_real = [1,1];\nlet fft_x_imaginary = [];\nfft_x_data.forEach(function(reading){\n fft_x_real.push(reading[0]);\n fft_x_imaginary.push(reading[1]);\n});\n\nlet fft_y_data = fft(y_readings);\nlet fft_y_magnitude = fftUtil.fftMag(fft_y_data);\nlet fft_y_real = [];\nlet fft_y_imaginary = [];\nfft_y_data.forEach(function (reading) {\n fft_y_real.push(reading[0]);\n fft_y_imaginary.push(reading[1]);\n});\n\nlet fft_z_data = fft(z_readings);\nlet fft_z_magnitude = fftUtil.fftMag(fft_z_data);\nlet fft_z_real = [];\nlet fft_z_imaginary = [];\nfft_z_data.forEach(function (reading) {\n fft_z_real.push(reading[0]);\n fft_z_imaginary.push(reading[1]);\n});\n\n// Finally build the fft_data object and add it to the message\nmsg.payload.fft_data = {\n frequency: fft_frequency,\n fft_x_data: fft_x_data,\n fft_x_magnitude: fft_x_magnitude,\n fft_x_real: fft_x_real,\n fft_x_imaginary: fft_x_imaginary,\n fft_y_data: fft_y_data,\n fft_y_magnitude: fft_y_magnitude,\n fft_y_real: fft_y_real,\n fft_y_imaginary: fft_y_imaginary,\n fft_z_data: fft_z_data,\n fft_z_magnitude: fft_z_magnitude,\n fft_z_real: fft_z_real,\n fft_z_imaginary: fft_z_imaginary\n}\nreturn msg;",
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"addr": "",
"sensor_type": "80",
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"retries_active": false,
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"impact_threshold": 25,
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