working on a board to use +smoothieware with the standard ramps board. Anybody willing to collaborate on this? I dont know if it is a very good idea but i am will to try as i have a few ramps and stepticks lying around.
@ekaggrat_singh_kalsi It is a reasonably good idea, however an established smoothieboard compatible maker has already produced one, which I have been testing. So if you don’t mind competition, continue 
I will warn you that you cannot use the thermistors on the ramps board so those needs to be migrated to the LPC board using AVCC and AGND. There are also some other 3.3v vs 5v issues that need to be overcome, including the mosfet switching.
Nice !
https://github.com/ekaggrat/smoothramps/tree/master
the intend is not to make a production board. It is just for the purpose of experimentation. +Peter van der Walt . I am not good at board layouts, so if you could point at mistakes it would be nice. @Wolfmanjm why cant the thermistors be used? I have included the mosfet drivers on the board , but i am not sure if they would work with the ramps mosfets. @Inderpreet_Singh
@ekaggrat_singh_kalsi because you need to use AVCC and AGND for ADC inputs, ramps has them hardwired to 5v and gnd, this causes enough noise to make them unusable. (also 5v will kill the ADC input).
Another observation I have made with various ARM based boards, is that you really need a 4 layer board for the clock speeds used. One thing I found becomes very unstable is the USB if you use only 2 layers, and are not very careful how you layout the USB traces. Smoothieboards are already extremely sensitive in the USB area, many people get a lot of disconnections.
@Wolfmanjm . yes the work around is to use two wire end stops. Regarding usb i think anyways the printer can be run through the sd card . So that should be stable enough
@ekaggrat_singh_kalsi If you have the choice between putting a USB connector and an Ethernet connector on there, you should really go with the Ethernet connector. It doesn’t have disconnection problems, and it does everything the USB cable does.
@Arthur_Wolf good point. It simply skipped me that smoothie doesn’t need the usb to upload the firmware. bummer. Revision coming up!
actually most developers use DFU to flash the firmware, if you don’t have USB it will be very inconvenient to flash, as most developers would not copy firmware.bin to the sdcard and reset. That would make development very tiresome.
@Wolfmanjm python upload ?
Nice! You could probably fit ethernet and micro usb.
@Liam_Jackson personally i hate micro usb, have snapped a few on other boards.
@ekaggrat_singh_kalsi yeah I’ve pulled a few poorly reflowed ones off of arduino nano clones. The ones with through hole tabs seem to be pretty tough though e.g. http://www.digikey.com/product-detail/en/10118193-0001LF/609-4616-2-ND/2785388
@Wei_Huang ???
Nice idea, I have a Rambo board and had a similar idea, but got to frustrated with trying to learn eagle cad and all the pcb rules. Huge congrats from me!
I would be more than interested to test it and i’d buy it right away if it prove to work!
it was my ignorance that back then i didnt know a similar project already existed… so i stopped work on it
any idea if it works?
the firepick delta people use it . yes it works i suppose.