Brand new chinese D1 mini dumps stuff into serial monitor

Projects Programming
1

Hi all.

I got a couple Wemos D1 mini clones from China. I just noticed straight out of the package it dumps a whole lot of data into the serial monitor. I have no idea what it is, it could just be "noise" or boot up messages but I still would like to check if someone maybe recognizes it or can tell me if I should be worried.

Thanks in advance!

Here is the data it kept dumping over and over into the serial monitor:

Connecting to HW-BELTLINE-01

Exception (29):
epc1=0x4000e1c3 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000018 depc=0x00000000

ctx: cont 
sp: 3ffef7a0 end: 3ffefba0 offset: 01a0

>>>stack>>>
3ffef940:  3fff1178 00000001 00000001 ffffff80  
3ffef950:  402223b6 40215850 00000018 3fff0b70  
3ffef960:  00000001 3fff1110 3fff1110 4022259c  
3ffef970:  3fff1110 3fff0b70 3ffe8568 00000000  
3ffef980:  3ffee004 3ffede18 0000f0b8 3ffe8568  
3ffef990:  4022d898 00000064 30a3c9ca fffeffff  
3ffef9a0:  00000018 0000ffff 00000000 00000001  
3ffef9b0:  3ffef9c8 4021eb50 3ffedd94 3fff0b70  
3ffef9c0:  30a3c9ca 3fffe76d 00000000 00000000  
3ffef9d0:  00000000 00000000 00000000 00000000  
3ffef9e0:  00000000 00000000 00000000 00000000  
3ffef9f0:  00000000 00000000 4021f847 3fff0b70  
3ffefa00:  3ffeea60 3fff0b70 3fff0b70 4021f88f  
3ffefa10:  00000000 3ffede18 3ffe8cbc 00000000  
3ffefa20:  4020e675 00000003 00000003 3ffe8568  
3ffefa30:  4020e78d 00000003 00000003 00000000  
3ffefa40:  00000001 4020e7e6 00000003 3ffe8568  
3ffefa50:  402022d0 00000000 00000000 00000000  
3ffefa60:  00000000 3ffe855c 3ffeea60 4020239d  
3ffefa70:  00000000 00000000 00000000 00000000  
3ffefa80:  00000000 00000000 00000000 00000000  
3ffefa90:  00000000 00000000 00000000 00000000  
3ffefaa0:  00000000 00000000 00000000 00000000  
3ffefab0:  00000000 00000000 00000000 00000000  
3ffefac0:  00000000 00000000 00000000 00000000  
3ffefad0:  00000000 00000000 00000000 00000000  
3ffefae0:  00000000 00000000 00000000 00000000  
3ffefaf0:  00000000 00000000 00000000 00000000  
3ffefb00:  3ffefbec 00000001 3ffe87b5 40203940  
3ffefb10:  3ffefbec 0000000d 3ffe8575 3ffeeb70  
3ffefb20:  3ffe8340 0000000e 3ffefbec 402036d5  
3ffefb30:  3ffe87b4 00000000 3ffefbec 402036d5  
3ffefb40:  00000000 3ffeeb70 3ffefbec 40203a14  
3ffefb50:  402012e6 0000000a 3ffefbec 3ffeeb70  
3ffefb60:  3ffe8340 3ffeea60 3ffefbec 40202088  
3ffefb70:  00000000 00000000 00000000 00000000  
3ffefb80:  3fffdc20 00000000 3ffeeb68 40202ea2  
3ffefb90:  00000000 00000000 3ffeeb80 40100114  
<<<stack<<<

 ets Jan  8 2013,rst cause:2, boot mode:(3,7)

load 0x4010f000, len 1264, room 16 
tail 0
chksum 0x42
csum 0x42
~ld
system param error
0b a2 ca 10 81 bd 98 e0 08 00 a8 d2 c8 3a b2 c4 27 a2 ca 10 81 87 98 e0 08 00 48 51 62 c4 23 88 
41 6a 48 42 04 00 80 44 11 5a 58 52 05 00 40 45 20 b6 24 09 4a 66 3b 56 57 33 02 07 64 0e 3c 2c 
0c 2b 20 a2 20 25 cd f1 21 46 9b 1d f0 2b 66 98 41 6a 59 52 05 00 0b 75 0c f8 77 38 06 5a 56 1b 
75 77 b3 11 c2 a0 32 b2 a0 02 20 a2 20 a5 ca f1 21 3c 9b 1d f0 00 62 22 0d 82 a0 00 82 66 02 37 
b7 43 3b 65 67 b3 0e 3c 2c 0c 2b ad 02 a5 c8 f1 21 34 9b 1d f0 00 88 41 7a 68 62 06 00 80 66 11 
5a 88 82 08 02 60 68 20 0b 86 b6 38 06 6a 77 2b 77 77 13 13 c2 a0 32 b2 a0 02 20 a2 20 a5 c5 f1 
21 28 9b 1d f0 00 0c 06 3b 55 38 41 5a 53 0c 03 39 61 39 71 06 5a 00 00 82 05 00 80 38 11 82 05 
01 30 88 20 32 05 02 80 33 11 72 05 03 30 37 20 72 c3 04 77 b6 0f c2 a0 32 b2 a0 02 ad 02 a5 c1 
f1 21 17 9b 1d f0 0c d9 97 18 7a 87 29 1e 66 18 02 46 2f 00 e6 28 04 bc f8 46 41 00 66 98 02 c6 
1f 00 0c b9 97 98 02 c6 21 00 06 3d 00 1c 79 97 98 02 86 2f 00 87 29 10 66 b8 02 c6 35 00 1c 69 
97 98 02 c6 26 00 06 36 00 2c 39 97 98 02 c6 2c 00 91 fb 9a 97 18 1b c6 31 00 82 22 00 82 28 0b 
16 e8 0b 30 c3 20 4b b5 ad 02 e5 72 ff 16 1a 0b 46 a6 00 cd 03 4b b5 ad 02 e5 7b ff 56 1a 29 0c 
18 89 71 c6 26 00 88 22 66 18 02 c6 24 00 cd 03 4b b5 20 a2 20 e5 95 ff 56 9a 27 0c 19 99 61 c6 
1f 00 cd 03 4b b5 20 a2 20 a5 9a ff 16 2a 07 86 99 00 82 22 0e 82 d8 08 a2 28 0a 92 a0 01 90 9a 
20 99 a8 cd 03 4b b5 ad 02 e5 7d ff 16 2a 05 86 92 00 cd 03 4b b5 20 a2 20 a5 80 ff 16 2a 04 86 
8f 00 30 c3 20 b2 c5 04 20 a2 20 25 82 ff bc 0a 46 8c 00 00 30 c3 20 b2 c5 04 20 a2 20 25 84 ff 
9c ea c6 88 00 30 c3 20 b2 c5 04 20 a2 20 e5 9e ff 8c da 86 85 00 cd 03 4b b5 ad 02 e5 ac ff 56 
ea 20 30 36 c0 62 c3 fc 7a 55 32 c3 fb f6 33 0f 3c 2c 0c 2b ad 02 25 ae f1 21 c9 9a 1d f0 00 00 
56 46 e9 58 51 32 c5 25 68 41 3a 36 39 41 0c 05 46 0b 00 00 00 72 03 00 62 a0 56 67 97 1e 62 03 
01 56 86 01 52 22 05 38 02 32 03 99 37 a5 14 5c 6c 0c 2b ad 02 25 aa f1 21 ba 9a 1d f0 2b 55 2b 
33 47 35 d0 32 21 06 56 83 01 b2 a0 04 ad 02 65 1a 11 cc 4a 0c 4b c6 00 00 00 b2 a0 00 a2 22 0e 
25 16 11 32 21 04 0c 05 86 0c 00 00 00 62 03 00 56 66 02 72 03 01 62 a0 ff 67 97 1d 32 22 02 66 
13 0e c2 a0 28 0c 2b ad 02 e5 a4 f1 21 a5 9a 1d f0 0c 13 32 62 2f c6 01 00 00 2b 55 2b 33 47 35 
cb 32 22 2f 26 13 0d 58 02 52 25 27 62 a0 30 50 56 10 26 c5 2a 58 22 66 15 06 66 13 03 68 71 ac 
26 66 15 0b cc 83 68 02 62 26 27 3c 07 67 07 19 66 15 1c dc e3 38 71 26 13 1f 0c 03 06 07 00 00 
0c 13 86 05 00 0c 13 46 04 00 0c 13 06 03 00 00 0c 03 86 01 00 0c 03 46 00 00 0c 13 66 13 0d 2c 
8c 0c 2b ad 02 25 9d f1 21 86 9a 1d f0 58 02 38 52 50 33 a0 38 03 39 51 0c 0a a9 01 7d 0a 06 0d 
00 92 03 00 b8 06 b0 88 74 87 99 19 92 03 01 b0 80 74 87 99 10 cd 01 ad 
01 c6 00 00 00 62 c1 10 32 22 1b a2 03 05 65 3a 10 16 9a 0a 32 22 0d 42 23 18 a0 ba 20 a2 a0 bc 
aa a4 65 0d 10 16 ba 09 0c 07 0c 63 06 03 00 00 00 52 a0 04 72 a0 14 62 c1 10 3d 05 2b 43 92 22 
20 47 b9 02 46 20 00 82 22 1b 3a 88 32 08 00 80 33 11 82 08 01 30 38 20 3a 84 87 99 72 88 e2 82 
28 f3 bd 01 20 a2 20 e0 08 00 88 d2 a2 28 18 e2 22 1b fd 03 4a ee dd 07 cd 06 bd 05 32 a0 bc 3a 
aa a5 bb eb 3d 0a 56 ba 04 ad 02 65 21 10 2d 03 1d f0 2d 0a 1d f0 2d 0a 1d f0 00 00 21 38 97 1d 
f0 21 36 97 1d f0 00 00 21 c7 95 1d f0 21 33 97 1d f0 00 00 21 32 97 1d f0 21 30 97 1d f0 21 2f 
97 1d f0 00 21 2e 97 1d f0 21 2c 97 1d f0 00 00 21 2b 97 1d f0 2d 0a 1d f0 00 00 00 36 41 00 32 
22 01 66 b3 02 c6 3b 00 32 22 0e 16 e3 0e 20 a2 20 a5 fb ef 3d 0a 56 8a 0e 88 12 0c f9 87 b9 02 
06 39 00 91 1f 97 90 88 a0 88 08 a0 08 00 0c 18 89 12 2d 0a 1d f0 20 a2 20 e5 d8 fe a0 2a 20 90 
00 00 20 a2 20 e5 40 ff a0 2a 20 90 00 00 20 a2 20 e5 c6 f0 a0 2a 20 90 00 00 20 a2 20 e5 61 ff 
a0 2a 20 90 00 00 20 a2 20 65 98 ff a0 2a 20 90 00 00 20 a2 20 65 2e ff a0 2a 20 90 00 00 20 a2 
20 a5 64 f1 a0 2a 20 90 00 00 20 a2 20 a5 ca ff a0 2a 20 90 00 00 20 a2 20 25 dc ff a0 2a 20 90 
00 00 20 a2 20 a5 9c f1 a0 2a 20 90 00 00 20 a2 20 65 a5 f1 a0 2a 20 90 00 00 38 e2 32 d3 08 38 
b3 8c 73 ad 02 25 2c ff 2d 0a 1d f0 20 a2 20 65 d1 f0 a0 2a 20 90 00 00 20 a2 20 65 d3 f0 a0 2a 
20 90 00 00 0c f8 89 12 2d 0a 1d f0 20 a2 20 e5 2b f0 30 23 20 90 00 00 21 7c 95 1d f0 21 7a 95 
1d f0 2d 0a 1d f0 00 00 21 78 95 1d f0 00 00 00 36 41 00 ed 06 dd 05 cd 04 bd 03 ad 02 65 d1 f8 
2d 0a 1d f0 36 c1 00 79 c1 7d 02 ad 01 65 d7 f7 bd 04 ad 02 65 95 f8 2d 0a ec 7a f8 c1 ed 06 dd 
04 cd 05 bd 01 ad 07 25 a6 f8 2d 0a dc 4a ad 01 e5 71 f8 cc aa bd 01 ad 03 a5 e1 00 2d 0a 86 00 
00 21 68 96 ad 01 65 d8 f7 1d f0 00 36 41 00 c2 a1 34 0c 0b ad 02 81 28 94 e0 08 00 1d f0 00 00 
36 41 00 16 d2 03 ad 02 a5 d7 f7 a2 a0 88 aa a2 a5 d5 f7 a2 a0 ac a0 a2 80 25 d5 f7 a2 a0 e0 a0 
a2 80 a5 d4 f7 a2 a1 04 aa a2 25 d4 f7 a2 c2 7c a5 ce 00 a2 a0 d0 a0 a2 80 25 ce 00 a2 a1 28 aa 
a2 a5 cd 00 1d f0 00 00 36 61 00 70 e7 20 16 62 04 82 22 16 16 58 04 72 a0 88 7a 72 dd 06 cd 07 
b2 c2 7c ad 02 a5 f2 ff fc 6a dd 05 cd 04 bd 01 ad 02 65 86 f8 ec da e8 01 e0 f5 c0 ea e4 4b d1 
c2 22 37 bd 07 ad 02 25 7d f8 dc ca 28 11 48 01 2a 24 29 03 0c 02 1d f0 21 3b 96 1d f0 21 39 96 
1d f0 2d 0a 1d f0 2d 0a 1d f0 2d 0a 1d f0 00 00 36 41 00 c2 23 00 c0 c4 c0 30 b3 20 ad 02 e5 7c 
f8 dc 5a d8 03 d0 d4 c0 cd 03 b2 a0 ac ba b2 ad 02 a5 74 f8 cc 6a 0c 02 1d f0 2d 0a 1d f0 2d 0a 
1d f0 00 00 36 41 00 30 b3 20 20 a2 20 25 e4 f7 fc 2a 66 14 10 b2 a0 88 ba b3 a2 a0 ac aa a2 a5 
d0 f7 2d 0a 1d f0 56 24 02 a2 a0 8$�{ld#��{��Ĝ��8d�c$`��������l��lddll�;�$�$��d���l�����d`
2

You have what I know as a boot loop

On booting up the code running on the board causes a runtime error (often caused by memory corruption due to bad programming) , dumps diagnostic messages to the Serial monitor, reboots, gets the same error, dumps the messages and so on for ever

What sketch has been uploaded to the board ?

1 Like
3

That is the curious part. Nothing. Or rather, I have not uploaded anything. I took it out of the package, soldered headers to it, connected it to my computer and then this happened. Once I uploaded my code it stopped. I had opened the serial monitor by chance, there was nothing to monitor yet (as far as I knew)

EDIT: Also I should mention, it seems to work just fine so far. Does exactly what I expected it to do. The data dumping just frightened me a bit, like maybe I had just essentially connected a rubber ducky to my computer or something.

4

So, no problem then

1 Like
5

Happy to hear that, thanks :slight_smile:

6

Don't nearly all of the ESP boards dump bootup and firmware info to the serial, often at weird bitrates? Normally it stops and runs the "user program" immediately thereafter. (maybe it stops when you install an arduino-compatible "bootloader"?)

7

It's the first time I have seen it happening, just wanted to make sure I was okay. It stopped and has not happened since I uploaded my own code

8

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