Member Since: February 27, 2012

Country: United States

  • Hi, can you explain how the Q2 p-channel mosfet works connected between USB power and Vin? Seems like just a fancy diode to ensure USB power flows only one way. I don't understand what the gate does.

  • Is it polyphonic? I know that's too much to ask in a $20 board with a lot of cool things but it doesn't say it anywhere!

  • Also, what does the Green LED on arduino pin SCK(D13) do? Is it just show when the SPI is active? I'm not using the SPI, so I thought I might use it to show when a file is playing. I'd have to use my own timers to estimate that, right? There's no feedback from the codec to tell me when a track has finished playing? Thank you!

  • Hello, The guide says VIN can be 3.3V to 6V while the schematic says 3.3V to 9V input on VIN but it looks like the VLSI cutsheet says 5.5V.. so I guess I answered my question?

  • will this diode tester light up an LED?

    I have one meter that can do this but haven't found another in years... at my $70 price point..

    "A digital multimeter with a Diode Test function can be used to test LEDs of various colors if the DMM applies a sufficient voltage potential at the meter leads to overcome the forward voltage requirement of the LED. The Diode Test function typically applies 2 mA of current to the diode under test. This current along with enough voltage to overcome the forward bias requirement is usually enough to illuminate most LEDs."

    Most DMM are around 1.5V and fall short of the 2.5-3V you really want. The literature for this multimeter under diode testing says, "Forward DC current is about 1.0mA, and backward voltage is about 3.0V." The term backward voltage is confusing... is this forward voltage? Will this light up an LED? thank you, thomas

  • Hello! Is the 3.3v RX pin 5V tolerant? thanks,

  • I struggle for way too long to change the pin on altSoftSerial to other than pin 9. I finally got it to work by using softwareSerial library as follows.

    #include <SoftwareSerial.h>
    #include <wavTrigger.h>
    SoftwareSerial wavSerial(6,5);  //pin 5 is used to TX to wave trigger pin 6 is not used
    void setup() {
    void loop() {
      uint8_t txbuf[8];
      int trk = 1; //plays track 1
      int code = 1; //plays polyphonic (see wavTrigger.h library for codes)
      txbuf[0] = 0xf0;
      txbuf[1] = 0xaa;
      txbuf[2] = 0x08;
      txbuf[3] = CMD_TRACK_CONTROL;
      txbuf[4] = (uint8_t)code;
      txbuf[5] = (uint8_t)trk;
      txbuf[6] = (uint8_t)(trk >> 8);
      txbuf[7] = 0x55;
      wavSerial.write(txbuf, 8);
  • I'm new to stepper motors.

    I changed the delay(stepValue) functions below to delayMicroseconds(stepValue); and it smoked the board. Any idea why?

    digitalWrite(stp,HIGH); //Trigger one step forward


    digitalWrite(stp,LOW); //Pull step pin low so it can be triggered again


  • where does the heat sink go? thank you, thomas

  • There's a typo in the above advanced code... line 129 in the sketch.

    It should say tapType = 0; in lieu of intType = 0;

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