MP3 Trigger Power Jumper

Sensors Sound & Audio
1

I’m installing an MP3 Trigger, but I can’t get it to give me any any green status indication, other than the red power light.

It is connected via serial for power. I have measured 3.3v on the pin header on the board.

The USB / EXT switch is on USB.

In following the manual, I see something I can’t follow, which makes me wonder if this is a problem.

In the manual, this is listed for power:

Specifications

• Input Voltage Range: 4.5V to 12.0V DC, or regulated 3.3V (jumper selectable)

Below the photo of the board in the manual, these 5 points of interest are listed:

  1. USB or external power switch

  2. External power connector (5.5x2.1mm center positive)

  3. UART and USB power interface for the FTDI Basic (DEV-09115)

  4. Power selection jumper

  5. Trigger pins

Note that there is no jumper on the board, which is what I’m asking about.

In the photo of the board accompanying the 5 points of interest, the area indicated by “4”, says 3.3v and vbus, but there is no indicated what it means or how to use it to select 3.3 v. Additionally, the manual isn’t clear if this is even important.

This is the link to the board manual: https://robertsonics.com/resources/mp3t … -02-04.pdf

2

The “Power” section of our hookup guide https://learn.sparkfun.com/tutorials/mp … 1615791300 will walk you through this…please note the sections on “Why use a 5v FTDI instead of 3.3v?” and soldering the 3.3v jumper to the center pad (if your FTDI can provide enough current)

Hope this helps!

3

We need a little more information to be able to help you.

  • - Can you send a photo of the top and bottom of your board?
  • - Where are you measuring 3.3 volts on the board?
  • - Are you using a SD card that's 32GB [u]or smaller[/u] and formatted FAT32?
  • - Have you changed any jumpers on the board?

    • Finally, try this: Remove any flash card and turn on the power while holding down the center navigation switch position. This causes the microcontroller to enter the bootloader, and with no flash card installed you should see the Status LED blinking rapidly.

    4

    I need to amend my posting. I was measuring 3.3 v on the ftdi pins, BUT, in diagnosing it I discovered it should have been 5v there, based on my supply point. I have now corrected that. But, it’s still not giving me a green status. With this power issue, the first time I powered it on (at 3.3v) I had an 8g sd card formatted fat32, with the firmware hex update file on it. Possibly attempting to update it with only 3.3v caused it to fail and that messed up the bootloader? With 5v now, it’s still not giving me any green status indication at all. If you still need photos, I can send.

    5

    the first time I powered it on (at 3.3v) I had an 8g sd card formatted fat32, with the firmware hex update file on it. Possibly attempting to update it with only 3.3v caused it to fail and that messed up the bootloader?

    Unfortunately that is very possible.

    Have you tried powering the board from the power jack with the switch in the EXT position? Make sure the polarity on your power cable is center positive. Try removing the card from the card slot and holding down the nav switch to see if you get a blinking green. If you’re not, the bootloader is corrupt and the board isn’t going to work.

    6

    I haven’t but I will. Thanks.