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Hardware Questions / Re: Questions about adding line in to DIY Glo
« Last post by mario on May 18, 2019, 12:23:55 PM »
Hi Pablo, yes the firmware will be open - it is based on other open source projects, so it could not even be any other way. I'll put it here next to the Gecho firmware, just need to clean up the code a bit. Thanks for the email, will reply soon! :)
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Hardware Questions / Re: Questions about adding line in to DIY Glo
« Last post by pabloantxon on May 17, 2019, 12:33:16 PM »
Hi!

Great, I'll use 220nF caps then :)

About the firmware, is it open source? Have you uploaded it somewhere? I would like to take a look at it. If it is not don't worry, I understand you are very busy right now sending all the glos and working on the gecho v2.

I am interested in that board, I wrote you an email to gechologic at gmail dot com :)

Thanks for your reply!

Pablo
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Hardware Questions / Re: Questions about adding line in to DIY Glo
« Last post by mario on May 13, 2019, 12:04:05 PM »
Happy to hear it arrived in a good shape and you are enjoying it! :) I've had it on for hours while working on the laptop too, mostly on decaying reverb, typing sounds very cool with it.

Yes that's correct, the line input should be wired to MIC2 and AGND. But there should be 100nF-470nF caps in series with L/R lines (with larger capacity, lower frequencies get transferred - I usually add 220nF only, sounds great with them). The datasheet with more details about the codec is here if you need to check something.

In the current firmware there is no automatic detection or option for this yet, but there will be a parameter in config file to switch to the third and fourth option - line-in and both mics & line-in mixed, by pressing (+) and (-) together, the same way as you can now switch mics on and off. And perhaps add an option to make this a persistent setting that is remembered during power off.

By the way there is a new article about expansion board, planned to have it in the shop but there is a small error in it that requires rework, the 100k resistor needs to be mounted sideways. Until I get to fix it and order more, there are a few available - feel free to email me if you are interested in one. It expands Line-in and out, and also MIDI both ways through the 3.5mm Jack. Here it is shown in action, it's the previous version that did not yet have LEDs and used different keypad driver that did not work well.
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Hardware Questions / Questions about adding line in to DIY Glo
« Last post by pabloantxon on May 10, 2019, 11:37:43 AM »
Hello!
I received my DIY Glo two days ago and I'm loving it, it makes just typing at work a relaxing experience. I don't know about further experiments, but the way it already works as it came it is perfect :)

I'm looking at adding a line input to see what comes out of it when I connect my synths and stuff.
I've seen in the Hardware Extensions section ( http://phonicbloom.com/diy/make_your_own_enclosure/ ) that you can solder a line input to MIC2 L and R pads and I have a question.
I guess the tip and the ring of the mini jack go to the L and R pads, but what about the sleeve? Should it go to the AGND pad?

And another question:
If I add the line input, will I be able to choose the board microphones or the line input as the audio input, or will both work at the same time unless I change it in the software?
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Hardware Questions / Re: Duration of Lipo batteries
« Last post by pabloantxon on May 08, 2019, 01:08:27 PM »
Great,

I guess I'll be getting a 500 mah battery then, I really don't think I'll need 20 hours and the 500 mah one measures 3.5 x 2.5 cm, which will fit better and still give me plenty juice for any experimentation.

Thanks a lot for your quick reply!!! :)))
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Hardware Questions / Re: Duration of Lipo batteries
« Last post by mario on May 07, 2019, 07:04:44 PM »
Hi and welcome :) The board takes cca 50mA from 3.6-3.8V, and Li-Po generally keeps useful voltage down to 80-85% discharge, so you can expect to get playing time of [capacity in mAh * 0.8 / 50] which would be around 20 hours for 1200mAh. I haven't yet got to test full discharge curve with Li-Po, only with 2xAAA, so this is only a guesstimate.

Yes the PCB is smaller, 53x25mm, keypad adds a bit, it's 55x28mm and 10.5mm vertically (without buttons).
Actually, it's all here: http://phonicbloom.com/diy/make_your_own_enclosure/images/keypad_dimensions.png

The charging circuit is set to max charging current of 500mA to not overload common USB ports, and cut-off is 4.20V which is compatible with Li-Po or Li-Ion chemistry. You can expect charging times in ballpark of [battery capacity / 500] so e.g. 2 and half hours for 1200mAh cell.

For safety reasons, it's perhaps better to have a smaller capacity cell in. When choosing Li-Po, make sure you get one with internal protective circuit (overdischarge and overcurrent). It is very important also to protect the battery itself as Glo board contains voltage booster that will happily continue draining nearly discharged Li-Po (<2.5V) which is likely to damage it.

So, perhaps 1200mAh isn't too much of an overkill, but it really does not make sense to put in any larger... unless you are also adding some external circuitry (more sensors, controls, lights...) for minimal setup, even 250mAh might be fine for daily use.

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Hardware Questions / Duration of Lipo batteries
« Last post by pabloantxon on May 07, 2019, 01:30:24 PM »
Hello,
I'm expecting my DIY Glo to arrive any day now, and I have started searching lipo batteries to attach to it.
Looking at the dimensions of the Glo board (about 8 x 3.5 cm) I have found a 1200 mah 3.3v lipo battery that measures 5.2 x 3.5 cm and it seems to be fine for the task (actually 8 x 3.5 is the dimensions of the wooden whale, I guess the board is smaller).
My question is, do you have an estimate of how long should a fully charged battery last? I mean the charge cycle, not the full battery life. How many minutes / hours / whatever.
I see you a 250 mah battery on the tutorial for soldering the components, so maybe 1200 mah would be overkill?
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Software (PC and Mobile Apps) / Re: Could not retrieve firmware version from Gecho
« Last post by mario on November 26, 2018, 08:35:47 PM »
Yes the STM32 Flash Loader is a bit finicky when it comes to timing, or maybe it's the internal state of MCU, but it eventually works. For example it does not leave enough time for global erase by default, you need to change the timeout to about 10 seconds, or just ignore the warnings and flash it without erasing next time.

Thanks for sharing your observations - happy to hear you figured it out! :D

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Software (PC and Mobile Apps) / Re: Could not retrieve firmware version from Gecho
« Last post by keppeco on November 24, 2018, 01:01:40 AM »
Good news!  I was able to get the flash loader to work by keeping the Gecho off when plugging it in, then activating the flash loader at a specific time very soon after plugging in.
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Software (PC and Mobile Apps) / Re: Could not retrieve firmware version from Gecho
« Last post by keppeco on November 24, 2018, 12:43:16 AM »
Thanks for the quick response, mario, this is a real head scratcher! It does sound similar to the other post.  My CH340 comes up as COM9 in the device manager.  Where it gets really interesting is that when I try to run the STM32 Flash Loader, select COM9 and hit next, I get this error message:

No response from the target, the Boot loader can not be started.
Please, verify the boot mode configuration and the flash protection status,
Reset your device then try again...

I will post a video in a bit, I just wanted to give this update now in case it provides anymore clues.
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