hookedup

My first goal was to be able to read the bliptronics EQ shield. Here is a link to the shield and working code.

Bliptronics Spectrum Analyzer Shield
http://www.bliptroni...aspx?ItemID=116

Summary:
This is a seven band EQ chip, actually two of them (L and R), in an arduino shield.

Important:
You need to connect a wire from the 3.3 to the aref on the shield when using with netduino.

Working Code:

/* Code to read the Spectrum Analyzer chip from bliptronics.com
 * http://www.bliptronics.com/item.aspx?ItemID=116
 * 
 * Important: Connect a wire from the 3.3v to the ahref on the shield to work with netduino.
 * 
 * * Based on code from bliptronics.com and arduino community assistance.
 * Port by: Joseph Francis
 */

using System;
using System.Threading;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
using SecretLabs.NETMF.Hardware;
using SecretLabs.NETMF.Hardware.Netduino;

namespace BlipSpectrumAnalyzer
{
    public class Program
    {
        static OutputPort spStrobe = new OutputPort(Pins.GPIO_PIN_D4, false);
        static OutputPort spReset = new OutputPort(Pins.GPIO_PIN_D5, false);
        static OutputPort led = new OutputPort(Pins.ONBOARD_LED, false);
        static AnalogInput spReadL = new AnalogInput(Pins.GPIO_PIN_A0);
        static AnalogInput spReadR = new AnalogInput(Pins.GPIO_PIN_A1);

        static int[] Spectrum = { 0, 0, 0, 0, 0, 0, 0 };

        const int MUSIC_MIN = 190;

        static public void setupSpecrum()
        {
            spReset.Write(true);
            Thread.Sleep(1);
            spReset.Write(false);
            Thread.Sleep(1);
        }


        static public void readSpecrum()
        {
            byte Band;
            for (Band = 0; Band < 7; Band++)
            {
                //--- Trigger strobe to make multiplexer jump
                spStrobe.Write(true);
                spStrobe.Write(false);

                //--- Add the left and right values - then devide by 2
                int cVal = spReadL.Read();
                cVal += spReadR.Read();
                cVal /= 2;

                //--- Allow for a min hum
                if (cVal < MUSIC_MIN)
                {
                    cVal = 0;
                }

                //--- Set related bands (low to high = 0 through 6 for seven bands)
                Spectrum[Band] = cVal;

            }
        }


        static public void setup()
        {
            setupSpecrum();
        }

        static public void loop()
        {
            readSpecrum();
            string strOut = "";
            Boolean minHit = false;
            for (byte i = 0; i < 7; i++)
            {
                int SpectrumVal = Spectrum[i];
                if (!minHit && SpectrumVal > MUSIC_MIN)
                    minHit = true;

                if( strOut != "" )
                    strOut = strOut + " - ";
                strOut = strOut + SpectrumVal.ToString();

            }
            strOut = strOut + "\n";
            if (minHit)
                Debug.Print(strOut);
        }

        public static void Main()
        {
            setup();
            while (true)
            {
                loop();
            }
        }

    }
}

Results of code:
* will show nothing until you start the music .. then you get readings ...

698 - 752 - 835 - 969 - 1023 - 948 - 765

723 - 782 - 879 - 922 - 1023 - 880 - 695

635 - 712 - 768 - 851 - 1023 - 973 - 646

632 - 924 - 914 - 913 - 1023 - 895 - 621

557 - 815 - 761 - 847 - 1023 - 1023 - 699

691 - 840 - 632 - 791 - 1023 - 1023 - 632

595 - 753 - 559 - 805 - 1023 - 997 - 741

528 - 728 - 722 - 889 - 971 - 949 - 617

465 - 623 - 761 - 846 - 890 - 963 - 674

621 - 796 - 813 - 841 - 828 - 884 - 640