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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

LDR Pre MkII - LDR volume control and I/O switching
LDR Pre MkII - LDR volume control and I/O switching
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Old 23rd June 2019, 05:31 AM   #171
zdr is offline zdr  Belgium
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Itís either faulty display or something else messing with 5v power line, or maybe power line itself. 5v on d+ has to be absolutely stable and free of any noise.
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Old 23rd June 2019, 09:31 AM   #172
ernesternest is offline ernesternest  Europe
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Neb, wish you a fine Sunday!

First I checkted all the naked voltages with my scope. All three are ok.

Plugged in everything I have heavy signals on D+. After pulling out the display cable there is still some weird signal to see, yet it is much smaller. Then I soldered a 220ĶF cap directly to the display. The signal came down to 15mV and everything seems to work.

I flashed the Nano once again, and now I could go through the menue and set all things, including the LDR min resistance. I am now calibrating the thing again.

So I'm not sure, that the display is the reason, but I will order a new one. Do you accidently have a 1602 you do not need? I would be happy if you sold it to me.

Cheers, Ernst
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Old 25th June 2019, 08:36 AM   #173
zdr is offline zdr  Belgium
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Quote:
Originally Posted by ernesternest View Post
Neb, wish you a fine Sunday!

First I checkted all the naked voltages with my scope. All three are ok.

Plugged in everything I have heavy signals on D+. After pulling out the display cable there is still some weird signal to see, yet it is much smaller. Then I soldered a 220ĶF cap directly to the display. The signal came down to 15mV and everything seems to work.

I flashed the Nano once again, and now I could go through the menue and set all things, including the LDR min resistance. I am now calibrating the thing again.

So I'm not sure, that the display is the reason, but I will order a new one. Do you accidently have a 1602 you do not need? I would be happy if you sold it to me.

Cheers, Ernst
I'm not sure display is defective. It might be like that by (bad) design. I had also few which were injecting noise into power line, so ideally, OLED should be on it's own power rail. Wide.hk are usually OK to replace it in case of malfunction.
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Last edited by zdr; 25th June 2019 at 08:41 AM.
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Old 25th June 2019, 08:41 AM   #174
zdr is offline zdr  Belgium
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I managed to make these OLEDs from aliexpress work with my code:

BLUE 2.42" Digital LCD Screen 12864 128X64 OLED Display Module C51 Board For Arduino SSD1309 STM32 Diy Electronic 2.42 inch-in LCD Modules from Electronic Components & Supplies on Aliexpress.com | Alibaba Group

There are hardware modifications required which I can post here if there is interest. They are slightly cheaper then the ones from wide.hk.
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Old 25th June 2019, 09:01 AM   #175
streetpreacher is offline streetpreacher
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Please post the modd to be done for that Oled, I have two of that from other projecto, they are fine.
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Old 25th June 2019, 09:53 AM   #176
zdr is offline zdr  Belgium
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Quote:
Originally Posted by streetpreacher View Post
Please post the modd to be done for that Oled, I have two of that from other projecto, they are fine.
R4 - remove
R3, R5, R7 - OR (short with blob of solder)
DC - connect to VCC with 10K resistor (pullup)
RES - connect to VCC with 10K resistor (pullup) and connect to RST on Arduino.
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Old 25th June 2019, 09:56 AM   #177
zdr is offline zdr  Belgium
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IMG_5648.jpg
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Old 25th June 2019, 09:59 AM   #178
streetpreacher is offline streetpreacher
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Thanks, will it work with the same firmware, or need New version?
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Old 25th June 2019, 10:00 AM   #179
zdr is offline zdr  Belgium
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Quote:
Originally Posted by streetpreacher View Post
Thanks, will it work with the same firmware, or need New version?
100% compatible with existing firmware for graphic oled (with "G" in the name)
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Old 25th June 2019, 04:31 PM   #180
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Nice, probably today I will give it a try.
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