DF Player Mini Troubleshooting

Other Hardware General Electronics
1

Hi,

I'm trying to get a DF Player Mini to work.
So far I have had it hooked up to Pro Micro (3.3V) and tried all sorts of thing, to no avail.

I would like to start troubleshooting.
First thing first: Did I fry it?

The manual says: Input voltage 3.2-5.0 Typ 4.2

I hooked it up to my power supply and after measuring it supplies 5.22V
That's 4.4% above max.

Did this voltage fry my (two) DF Player Minis?
I would say unlikely.

Thanks.

My current circuit is this:

StandAlone
StandAlone1008×544 72.6 KB

2

No, they couldn't fry for that. They are able to receive a voltage slightly higher than 5v because almost no power supply provides 5.00v but generally between 4.5 and 5.5v. So the problem comes from elsewhere in my opinion.

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Ah yes, I found that info in the other thread.

Meanwhile I tried it with 512MB, 8, 16GB cards, all formatted FAT32 with a single 'mp3' folder containing 0001, 002 and 0003.mp3. I also tried 0001-0003.wav files.

Before building another setup, I would like to know whether it's faulty / I damaged it.
If it dosn't work in stand-alone mode it's probably not going to work with an Arduino?

Now I have this simple setup from DFRobot wiki page

DFmini_simple circuit
DFmini_simple circuit1063×529 16.1 KB

When I measure the voltage level on pins 9 / 11 / 12 and 13 I get:
1.35 / 0.22 / 0.01 and 0.01

And the TX should be high (3.3V) when not active right?
It's only 1.72.

This can't be right...

Just talked to someone who thinks my 'good old' computer power supply might have been the cause.

I've been using that to power my projects for a long time now. What I can think of is that the DF Player does not have a voltage regulator on board. Could that be it?

Thanks

EDIT:

Just found this info in this topic (using an ATX power supply):

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