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TOPIC: How to Troubleshoot pedalSHIELD UNO

How to Troubleshoot pedalSHIELD UNO 2 years 4 months ago #903

  • Ray
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I've problems with tremolo effect. It produces a very loud nois that cover the guitar sound. Do you know why it happens?

Are all the other effects working fine? is it just the tremolo effect the one that is giving you problems?
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How to Troubleshoot pedalSHIELD UNO 2 years 4 months ago #905

i've problems with tremolo and fuzz but with fuzz the problem is different. When i play softly it doesn't sound
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How to Troubleshoot pedalSHIELD UNO 2 years 4 months ago #908

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I've problems with tremolo effect. It produces a very loud noise that cover the guitar sound. Do you know why it happens?
I have replied to this on the tremolo effect topic:
www.electrosmash.com/forum/pedalshield-u...ct-pedal?lang=en#907
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How to Troubleshoot pedalSHIELD UNO 2 years 4 months ago #915

  • harry0011
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Hi, I've got an issue + a few suspicions as to why it might not be working. Sorry if this isn't the right place to post... I'm new to this site (and forums in general!) I'll re-post in the correct location if directed :)

I recently purchased the UNO shield and assembled it today. I'm newish to soldering, but I've had enough practice to make this an easier project in terms of construction. Looks good to my eyes.

I uploaded the code to a knock-off Arduino Mega -- I'm thinking this might be my issue, since my research has revealed there are very slight differences between the UNO and the Mega that might make some shields not work, even if they fit. Code uploaded fine. I tested the "clean" sample, and it seemed like everything was working. Hit the foot switch, LED came on, guitar signal was cut off. Hit it again, LED off, guitar back on. Cool!

I tried the boost code next. Uploaded fine again. Behavior-wise, it seemed to operate the same as the clean code, which seemed strange but I figured it was my ears. Moved on to the distortion code, also behaved like the clean code.

Any ideas what's going on? I haven't looked that deeply into the code yet, but I'm suspecting that there's a PWM/pin difference between the UNO and Mega that's causing no effects to actually take place... :( but then again I'm not entirely sure. This thing's only been in my possession for about 7 hours... :unsure:

I'd appreciate any and all help! Thanks in advance :)
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How to Troubleshoot pedalSHIELD UNO 2 years 4 months ago #917

  • Deegatron
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Hi all,
I'm stuck and need help. I've soldered all the components, attached an Arduino Uno, & plugged the whole thing in. The pedal toggles the LED on & off, and the underlying Arduino is working fine, but no sound passes through the board.
    I have:
  • checked every soldering point about a dozen times
  • made sure that every component is oriented correctly
  • tested each 1/2 inch cord (just to make sure that wasn't the problem)
  • tested that the GND, 2.5V, & 5V test point are correct
But still, no signal passes from the guitar to the amp.
I can't get the sine wave generator to work, so the output stage seems like the problem. But, I've looked it over and can't find any problems with parts, orientation, or joints. I've attached a few pictures. Please help

Thanks in advance!
Attachments:
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How to Troubleshoot pedalSHIELD UNO 2 years 4 months ago #919

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hi j.bardio
Any ideas what's going on? I haven't looked that deeply into the code yet, but I'm suspecting that there's a PWM/pin difference between the UNO and Mega that's causing no effects to actually take place... :( but then again I'm not entirely sure. This thing's only been in my possession for about 7 hours... :unsure:
your suspicions are in the right direction, the pedalSHIELD UNO is not compatible with the Arduino MEGA.
Not yet, there are some limitations you need to bypass to make it work, I have been working on this but I never got enough time to finish it (altough it is not complex).
Basically you cannot use the PWM output, like:
 
  //write the PWM signal
  OCR1AL = ((input + 0x8000) >> 8); // convert to unsigned, send out high byte
  OCR1BL = input; // send out low byte
 

you would need to use the number 4, like:

//write the PWM signal
OCR4AL =waveform[sample];// (((input + 0x08000)) >> 8); // convert to unsigned, send out high byte
OCR4BL = waveform[sample]; // send out low byte

That would need some software changes (not many, use ISR(TIMER4_CAPT_vect) and maybe something more) and also in the hardware connect the pins OCR4AL and OCR4BL instead of the OCR1AL and OCR1BL.

Sorry for not explaining all the details, this weekend I will try to get time to do it.
PS: it is not 100% sure that it will work, but feels like it is going that way.
Last Edit: 2 years 4 months ago by Ray.
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How to Troubleshoot pedalSHIELD UNO 2 years 4 months ago #920

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Hi crieder,
But still, no signal passes from the guitar to the amp.
You mean not signal at all, not even with the effect bypassed?

Did you check this topic?
www.electrosmash.com/forum/pedalshield-u...hoot-pedalshield-uno
Last Edit: 2 years 4 months ago by Ray.
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How to Troubleshoot pedalSHIELD UNO 2 years 4 months ago #921

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Sorry for not explaining all the details, this weekend I will try to get time to do it.
PS: it is not 100% sure that it will work, but feels like it is going that way.

No worries, I put in an Amazon order for an UNO. They're cheap enough, anyway :)

Still am curious to see if I can get it to work with the MEGA, I think that would be a valuable addition to this project. I'll see if I can do any tinkering using your suggestions, and report back if I have any successes!

If I do, I'll start a new thread specifically for playing with MEGA compatibility, so this thread doesn't get swamped :)
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How to Troubleshoot pedalSHIELD UNO 2 years 4 months ago #923

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If I do, I'll start a new thread specifically for playing with MEGA compatibility, so this thread doesn't get swamped
sure, if you do it we will stick your post to the top together with the other important guidelines.
Last Edit: 2 years 4 months ago by Ray.
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How to Troubleshoot pedalSHIELD UNO 2 years 3 months ago #926

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Hi Ray,

Yes, no signal at all. I was hoping that there was another option, but I think I may need to desolder the entire board & start again. I can't see a problem with any connection or component, so I'm not sure what else to do.
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