Welcome! Log In Create A New Profile

Advanced

End Stops

Posted by 3D rob 
End Stops
February 23, 2015 03:47PM
here in the schematic is the end stop like this:
[reprap.org]
I have held a different schematic accidentally like this:
[reprap.org]
from this site here:
[reprap.org]
this is mij ramps:
[img.dxcdn.com]
can I do so with the resistors from 10K like this? (is this good?)
can I do it this way?

sorry for bad english,
Greetings from the Netherlands!
thumbs up
Re: End Stops
February 23, 2015 04:16PM
The pull-up resistors are not needed externally, they are built in and activated in the ATMega2560. So your mechanical endstops are simply switches between Signal and Ground.

BTW the Ramps is IMHO quite dangerous concerning the endstop pin arrangement, if you put the endstop connectors the wrong way, you will short 5V to GND - and probably damage the 7805 on the Arduino Mega. So, beware of how you put the endstop connectors... Or even better, insert a small resistor (e.g. 270 Ohm) in series with the endstop switch, so even if you put connectors the wrong way, it won't do any harm.
Re: End Stops
February 24, 2015 03:06PM
.
thank you for your comment.
I think I stick to the schematic and try it.
I think this schematic has a chance and that nothing can/shall break.
thumbs up
friendly greetings from Netherlands!
Rob.
Re: End Stops
February 24, 2015 03:20PM
If you read the wiki page the mechanical endstop schematic came from, it says that for Teacup and Sprinter firmware (and Marlin since it's based on Sprinter) the 5V line and resistor are obsolete. They aren't necessary. You won't gain anything by having them and you're just increasing the size and complexity of the circuit. Just enable the pullup resistors in your firmware and be done with it.
Sorry, only registered users may post in this forum.

Click here to login