SD not working due to length of cable
Posted by kd6hq
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SD not working due to length of cable November 16, 2018 09:33AM |
Registered: 9 years ago Posts: 223 |
I've run into an interesting problem.
RAMPS 1.4, Firmware : Marlin 2.0
I recently built a new machine.
From what I can tell due to the length of ribbon cable for the display the SD support fails.
If I change the cables back to the original it works fine.
I will continue to experiment with it but has any one had this problem before?
Does anyone know if this is true?
Thanks
RAMPS 1.4, Firmware : Marlin 2.0
I recently built a new machine.
From what I can tell due to the length of ribbon cable for the display the SD support fails.
If I change the cables back to the original it works fine.
I will continue to experiment with it but has any one had this problem before?
Does anyone know if this is true?
Thanks
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Re: SD not working due to length of cable November 16, 2018 09:46AM |
Admin Registered: 16 years ago Posts: 13,886 |
... this is common for EMI (Electro-Magnetic-Interferencing) problems - either shield the single data lines or use higher voltage levels --> 5V bettter than 3.3V, 12V better than 5V ... industry uses 24V ...
Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
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Re: SD not working due to length of cable November 16, 2018 09:55AM |
Admin Registered: 13 years ago Posts: 7,000 |
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Re: SD not working due to length of cable November 16, 2018 10:42AM |
Registered: 9 years ago Posts: 223 |
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Re: SD not working due to length of cable November 16, 2018 10:48AM |
Registered: 9 years ago Posts: 204 |
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Re: SD not working due to length of cable November 16, 2018 01:07PM |
Admin Registered: 16 years ago Posts: 13,886 |
... yes, if shielded, then one end should be grounded.
In past we've arranged GND lines between data lines and/or inserted a resistor of around 20 to 50 Ohms into the data lines to reduce ringing ...
Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
In past we've arranged GND lines between data lines and/or inserted a resistor of around 20 to 50 Ohms into the data lines to reduce ringing ...
Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]
Call for the project "garbage-free seas" - [reprap.org]
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