hydronics

Product DEV-13664 about 6 days ago

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.

Product DEV-15165 last week

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!

Tutorial - Papa Soundie Audio Player Hookup Guide last week

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!

Tutorial - Papa Soundie Audio Player Hookup Guide last week

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?

Product TOL-12967 about 7 months ago

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

Product CAB-12977 about 2 years ago

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

Tutorial - WAV Trigger Hookup Guide V11 about 2 years ago

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() {
  wavSerial.begin(57600);
}

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);

  delay(2000);

}

Tutorial - Big Easy Driver Hookup Guide about 2 years ago

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

delay(stepValue);

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

delay(stepValue);

Product ROB-12859 about 2 years ago

where does the heat sink go? thank you, thomas

Tutorial - ADXL345 Quickstart Guide about 3 years ago

There’s a typo in the above advanced code… line 129 in the sketch.

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