Goseba

Seq v4 build finished - E131 D5 error - Solved

15 posts in this topic

Hi,

This is my first build since my teens around 35 years ago so. Thoroughly enjoying it and likely to be the first of many projects from now on.

I have almost finished my Seq v4, a basic version with 2 midi I/O boards, and have almost finished the Wilba CS board.

I have a couple of questions though based on Hawkeyes thread and this blog:  https://niroke.blogspot.co.uk/2017/07/an-unofficial-build-guide-for-midibox.html?showComment=1508576379601#c8456553481471882587

1) What value should R5A and R6A be?   Hawkeyes thread says 220ohm, but in the Mouser BOM it is two 220 ohm short for this but includes 2 x 470ohm resisters that I see no other use for.

2) The Mouser BoM for the CS board also lists 1 x 1kohm resister. What is this needed for?

Any help appreciated please.

Edited by Goseba

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Hi and welcome to MIDIbox, great that you are building again! :)

The BOM may use other LEDs than i used in the old tutorial and therefore it may reference different resistors for these different LEDs, which may explain also the 1k resistor.

But: normally no damage will occur (for normal LEDs and normal resistors > say 100 ohms), only the brightness will vary.
So: you could easily exchange the 220ohm for 470ohm resistors you have on hand, the corresponding LEDs will just not be as bright as the others.

Trick: if you have more 470 ohm resistors, you can "parallel them" to get effective 235 ohm resistors, which is close enough to the 220 ohms that you won't see an optical difference - you can even "piggyback" them later on, by just soldering another 470 on top of an existing one :)

Many greets and have fun building!
Peter

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Hi Peter,

Many thanks for the quick reply. I was up the shed soldering the encoders when I saw your reply on my phone. I used the 470's since I don't have 220's, but I have spare 470's so could piggyback as you suggest if needed.

Your thread and the other blog have both been so useful, thank you Peter and Nicholas.

I have been hesitating for a couple of years about giving it a go but decided to take the plunge just before Christmas.

I think I have now finished the soldering aside from the LED's. I will do these when I have the case (shipped today, so should get it early next week). Time to order some standoffs etc for the mounting.

I have thoroughly enjoyed it so far.

Thanks,

Tim

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Powered up tonight, midi connected to a synth and it worked first time (once I realised I had to change the mid port from USB to midi). So happy and relieved.

I still have the main encoder and LED's to add but will wait till the case arrives next week.

A big thank you to all those whose guides gave me the courage to take this on. :-)

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Now some LED questions - orientation.

For the 16 red/green leds, which way do the leds go in? From the top, the left holes are L1, L2 etc and the right holes S1, S2 etc. 

For the red beat led, the holes are marked 1 and 2. Which way for this led?

For the remaining green leds the holes are just L1/S1 etc. Same question.

And which of the holes for led 31 are to be used?

Thanks in advance for any help.

Tim

update: just need to find the led 31 orientation now.

Edited by Goseba
Update

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You can see the LED orientation in this image on the lower right side. All LED's are like L17 in the image they have their cathode facing right, except L31 which is reversed and faces left. Just place your LED's flat side so they line up with the flat side silkscreened on the PCB.

Untitled picture.png

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Thanks for the reply Slo.

I have figured out all of the LED's so far (and working nicely) but I am still unsure about number 31. This has 4 holes. Am I right looking at the circuit above that it goes in the middle two holes? 

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Yes...middle 2 holes, but 180 degrees from the others

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Ok, I have tried every permutation of their four holes and orientation of the LED for number 31. It is either permanently on or it doesn't light at all.

Any suggestions please?

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I just finished my build this morning (with the exception of some incorrectly supplied knob caps).

All seems good so far as testing buttons, encoders etc, and this afternoon I will hook it up to some midi gear.

However when I went to save a pattern , I get SD Card Error!!!  E131 FatFa: D 5. Can anyone help with this please?

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Can you try another SD Card and see if the error repeats? I'm assuming you have formatted it correctly and placed the hardware HW file on the card it is <4gig.

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I found the solution in another thread which I have just tried and it has solved it. I had to create a new directory via MIOS studio.

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Great.....thumbs up!

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Quite pleased to have finished with relatively few issues.

A big thanks to all those who posted build threads/blogs and the quick answers from others when needed!

Now to learn it. 

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