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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 12th May 2021, 05:51 AM   #361
zdr is offline zdr  Belgium
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It seems to me that your OLED is drawing too much current which brings down the voltage on Nano supply line, or you have a parasitic resistance somewhere along the power line.

1) Connect OLED to separate (LAB) 5V power supply and check how much current it draws.
2) When OLED is connected, is 2.02V consistent throughout the 5V line starting from 7805 regulator, or is there a voltage drop somewhere along the line? If you have 5V after the regulator and 2.02 at VCC on OLED, you have a resistance somewhere along the line.
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Old 12th May 2021, 06:28 AM   #362
EfkaIII is offline EfkaIII  Lithuania
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Quote:
Originally Posted by didiet78 View Post
I think you have problem on vcc oled
Do you mean that voltage on LED VCC supply line should be 5 VDC ?
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Old 12th May 2021, 07:05 AM   #363
EfkaIII is offline EfkaIII  Lithuania
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Quote:
Originally Posted by zdr View Post
It seems to me that your OLED is drawing too much current which brings down the voltage on Nano supply line, or you have a parasitic resistance somewhere along the power line.

1) Connect OLED to separate (LAB) 5V power supply and check how much current it draws.
2) When OLED is connected, is 2.02V consistent throughout the 5V line starting from 7805 regulator, or is there a voltage drop somewhere along the line? If you have 5V after the regulator and 2.02 at VCC on OLED, you have a resistance somewhere along the line.
1-> The current of OLED power is 4.1mA
2-> When OLED connected the 2.02V DC is on terminal OLED VCC or main board point VCC. All regulators 7805 gives on output from power supply up to main board 5V DC.

Without schematic I`m "in dark forest at night"....
From where VCC to OLED is powered ? I found O+ and OLED VCC is the same, but this power terminal "O+" option is not used as I understood

Last edited by EfkaIII; 12th May 2021 at 07:10 AM.
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Old 12th May 2021, 09:11 AM   #364
zdr is offline zdr  Belgium
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Ok, I think I know what the problem is. You have a latest mainboard PCB which has separate O+ power for OLED, but that one is not connected as you don't have OLED (O+) output on PS board. You need to connect R+ and O+ lines to supply OLED with power.
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Last edited by zdr; 12th May 2021 at 09:17 AM.
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Old 12th May 2021, 09:18 AM   #365
zdr is offline zdr  Belgium
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You can put a short wire between R+ and O+. In case OLED needs more power, you can try D+ instead of R+.
Attached Images
File Type: jpeg IMG_20210508_with OLED.jpeg (668.6 KB, 83 views)
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Last edited by zdr; 12th May 2021 at 09:23 AM.
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Old 12th May 2021, 09:40 AM   #366
EfkaIII is offline EfkaIII  Lithuania
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Yes I understood when talking starts regarding 5V DC VCC.
You need to update your manual
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Old 12th May 2021, 01:45 PM   #367
EfkaIII is offline EfkaIII  Lithuania
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Next step regarding ERROR 10:
I would like to double check :
1. acc. attached picture LSE and LSH (another "Right" channel will be similar) are in this places with check points on PCV (right upper side) v. 1.31?
2. If the 1. is OK, then after adjusting BIAS (700k /next time 750K for double check) and after setting in "Parameters menu" LSE/LSH/RSE/RSH minimum resistance (for my project 35...37ohm) I can not start calibration procedure - receive ERROR 10.
3. What is a levels in "Show Statistics" : LSEmin/RSEmin/LSHmin/LSRmin? Because theses levels are not the same as I set in Parameters menu.
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File Type: jpg LSE_LSH.jpg (15.8 KB, 71 views)
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Old 12th May 2021, 03:04 PM   #368
zdr is offline zdr  Belgium
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What is the error 10 text saying? Forget about show stats, nano can never measure Ldrs correctly, thatís why we still use multimeters.
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Old 12th May 2021, 03:56 PM   #369
EfkaIII is offline EfkaIII  Lithuania
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Error 10:
LSE too low
- adjust RT1
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Old 12th May 2021, 07:07 PM   #370
zdr is offline zdr  Belgium
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Try to reset Nano few times without powering off the circuit, see if that will make a difference.
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