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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 13th July 2019, 01:09 PM   #221
sabre66 is offline sabre66  Canada
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Quote:
Originally Posted by zdr View Post
Scl and sda are pulled to vcc with 2k2 resistors so they should be around 5v. Make sure you modified oled without any errors. It seems that scl and sda are messing with i2c bus preventing arduino from booting.
That what I was thinking. The modifications of the old OLED seem ok so I'm just going to wait for the new oled. Until then I'm going to wine country.
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Old 15th July 2019, 07:52 AM   #222
zdr is offline zdr  Belgium
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That what I was thinking. The modifications of the old OLED seem ok so I'm just going to wait for the new oled. Until then I'm going to wine country.
You can try putting a cap of around 1000uF on D+ line, in case you have garbage injected from OLED.
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Old 15th July 2019, 07:53 AM   #223
zdr is offline zdr  Belgium
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Another display that works with this project, requires no additional components to be soldered and cheapest I could find:

White 2.42" 2.42 inch LCD Screen 12864 OLED Display Module IIC I2C SPI Serial for C51 STM32 SSD1309-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group
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Old 17th July 2019, 05:53 PM   #224
zdr is offline zdr  Belgium
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Sorry folks, there has been an error in how to do a hardware mod on your displays. You MUST NOT pull DC to VCC, otherwise you will set I2C address to 0x3D, and firmware looks for 0x3C. So the correct instructions are below:

R4 - remove
R3, R5, R7 - 0R (short with blob of solder)
RES - connect to VCC with 10K resistor (pullup)
RES - connect to GND with 10uF cap (keeps RES low during display power up)
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Old 18th July 2019, 05:10 AM   #225
sabre66 is offline sabre66  Canada
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Originally Posted by zdr View Post
Sorry folks, there has been an error in how to do a hardware mod on your displays. You MUST NOT pull DC to VCC, otherwise you will set I2C address to 0x3D, and firmware looks for 0x3C. So the correct instructions are below:

R4 - remove
R3, R5, R7 - 0R (short with blob of solder)
RES - connect to VCC with 10K resistor (pullup)
RES - connect to GND with 10uF cap (keeps RES low during display power up)
Thank You for the update !!!!!!!!

Powered up and calibrated but im going to get some clips for the ldrs I just could not get a proper hold of them.

Paul
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Old 18th July 2019, 05:12 AM   #226
zdr is offline zdr  Belgium
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Originally Posted by sabre66 View Post
Thank You for the update !!!!!!!!



Powered up and calibrated but im going to get some clips for the ldrs I just could not get a proper hold of them.



Paul


There are big holes next to each ldr used to stick your probes for measurements
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Old 18th July 2019, 05:14 AM   #227
sabre66 is offline sabre66  Canada
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Originally Posted by zdr View Post
There are big holes next to each ldr used to stick your probes for measurements
Awesome!!!! thanks again
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Old 18th July 2019, 05:25 AM   #228
sabre66 is offline sabre66  Canada
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Do The parameters need to be changed ? They are all set to min of 40 or do I need to set their actual measured values are lowest of 40.5 and highest 52 my D+ is 5.06
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Old 18th July 2019, 05:32 AM   #229
zdr is offline zdr  Belgium
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Yes, you need to set min values. You can measure them while in set menu and put values directly in.
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Old 20th July 2019, 04:30 PM   #230
sabre66 is offline sabre66  Canada
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So after 2 days of testing ( and working great) I woke up this morning and I noticed the unit was frozen up so I rebooted now the screen sometimes lights up with garbage or with one or two lines showing and no ir response. I have my new oled coming maybe thats the issue Im not sure.
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