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TOPIC: Audio: Spectrum Meter (32x8 Resolution)

Audio: Spectrum Meter (32x8 Resolution) 3 years 3 weeks ago #1874

Ray
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This code was originally developed by openmusiclabs.com . All credit to them.
You can find more info about it in the original websites:
wiki.openmusiclabs.com/wiki/FHTExample

The code reads the A0 analog value and represents it over the four 8x8LED matrices.

The first upper row represents the first part of the spectrum and the two lower LEDs represent the end of the spectrum

You can change the brightness in the line

lc.setIntensity(i, 12); // 15 = brightest

This is the complete code:

File Attachment:

File Name: Spectrum_Meter_32x8.zip
File Size: 588 KB

The key part of the code is here:

		    // First matrix		
        lc.setColumn(0, 7, bitswap(bar((fht_log_out[0] ) * 1)));
        lc.setColumn(0, 6, bitswap(bar((fht_log_out[1] ) * 1)));
        lc.setColumn(0, 5, bitswap(bar((fht_log_out[2]) * 1)));  
        lc.setColumn(0, 4, bitswap(bar(av(fht_log_out, 4, 5) * 1)));
        lc.setColumn(0, 3, bitswap(bar(av(fht_log_out, 6, 7) * 1)));
        lc.setColumn(0, 2, bitswap(bar(av(fht_log_out, 8, 9) * 1)));
        lc.setColumn(0, 1, bitswap(bar(av(fht_log_out, 10, 11) * 1)));
        lc.setColumn(0, 0, bitswap(bar(av(fht_log_out, 12, 13) * 1)));      
        // Second matrix
        lc.setColumn(1, 7,bitswap(bar(av(fht_log_out, 14, 16) * 2)));
        lc.setColumn(1, 6,bitswap(bar(av(fht_log_out, 17, 19) * 2)));
        lc.setColumn(1, 5,bitswap(bar(av(fht_log_out, 20, 22) * 2)));
        lc.setColumn(1, 4,bitswap(bar(av(fht_log_out, 23, 25) * 2)));
        lc.setColumn(1, 3,bitswap(bar(av(fht_log_out, 26, 28) * 2.1)));
        lc.setColumn(1, 2,bitswap(bar(av(fht_log_out, 29, 30) * 2.1)));
        lc.setColumn(1, 1,bitswap(bar(av(fht_log_out, 31, 32) * 2.1)));
        lc.setColumn(1, 0,bitswap(bar(av(fht_log_out, 33, 39) * 2.1)));
        // Third matrix
        lc.setColumn(2, 7,bitswap(bar(av(fht_log_out, 40, 44) * 2.2)));
        lc.setColumn(2, 6,bitswap(bar(av(fht_log_out, 45, 49) * 2.2)));
        lc.setColumn(2, 5,bitswap(bar(av(fht_log_out, 50, 54) * 2.2)));
        lc.setColumn(2, 4,bitswap(bar(av(fht_log_out, 55, 59) * 2.2)));
        lc.setColumn(2, 3,bitswap(bar(av(fht_log_out, 60, 64) * 2.4)));
        lc.setColumn(2, 2,bitswap(bar(av(fht_log_out, 65, 69) * 2.4)));
        lc.setColumn(2, 1,bitswap(bar(av(fht_log_out, 70, 74) * 2.4)));
        lc.setColumn(2, 0,bitswap(bar(av(fht_log_out, 75, 79) * 2.4)));
        // Fourth matrix
        lc.setColumn(3, 7,bitswap(bar(av(fht_log_out, 80, 86) * 2.6)));
        lc.setColumn(3, 6,bitswap(bar(av(fht_log_out, 87, 93) * 2.6)));
        lc.setColumn(3, 5,bitswap(bar(av(fht_log_out, 94, 100) * 2.6)));
        lc.setColumn(3, 4,bitswap(bar(av(fht_log_out, 101, 107) * 2.7)));
        lc.setColumn(3, 3,bitswap(bar(av(fht_log_out, 108, 114) * 2.7)));
        lc.setColumn(3, 2,bitswap(bar(av(fht_log_out, 115, 119) * 2.8)));
        lc.setColumn(3, 1,bitswap(bar(av(fht_log_out, 120, 123) * 2.8)));
        lc.setColumn(3, 0,bitswap(bar(av(fht_log_out, 124, 127) * 3)));