prusa super switch

[JustinCaseOfWolf]

any plans to upload that?

[JustinCaseOfWolf]

this one https://d17kynu4zpq5hy.cloudfront.net/igi/prusa3d/BMhgGmov5EBXZaxu.large

[JustinCaseOfWolf]

anybody reading these messages?

[madhunm]

+1 Any plans to upload the super switch schematic?

[cscott]

Some small clues at https://github.com/MarlinFirmware/Marlin/commit/5b11b33854c9950b9a98005aa7783b1fe67b6269 FWIW.

[AJMartel]

I am looking for the "MK42 stepper SWITCH rev 0.4" schematics as well.

[JustinCaseOfWolf]

that is a very different design -fairly simple to gues swhat is going on there :)

[JustinCaseOfWolf]

just to make it a bit clearer the circuit is so:

• assume A and B as being the 2 line inputs that can be either high or low
• C is A NOR B (through the 2 transistors circuit see http://www.electronics-tutorials.ws/logic/log46.gif for an example) C will be high only when both A and B are low.
• a relay has one control input, one controlled input and 2 output (normally open and normally closed). subject to control input being high or low we will see controlled input to either normally open or normally closed outputs.

basic diagram:

----------------/ output when control input is high control input -- controlled input ----------------\ output when control input is low

the 3 relays are defined as such:

------/ M1 ( this will be power when both A and B are low) C --- power ------\ FWD1 (this will output power when either A or B or both are high)

------/ FWD2 (this will be power when A is high which makes C low) A --- FWD1 (this will be power in when either A or B or both are high) (this is output on low from C relay) ------\ M2 (this will be power when A is low and B is high - we need C low)

------/ M3 (this will be power when A and B are high which makes C low) B --- FWD2 (this will be power in when A is high which makes C low) (this is output on high from A relay) ------\ M4 (this will be power when A is high and B is low which makes C low)

in plain english: -first relay will control a motor(1) when both inputs are low, otherwise will forward the current to second relay. -second relay will forward current to third relay when first input is high or control a motor(2) when second input is high. if second input is low then first relay is active. and second relay doesnt have current -third relay will output power to a motor(3) when second input is high or to a motor(4) when second input is low. third relay only has power when first input is high, otherwise it will not give current to any motors.

hope this helps.

[ok1hra]

Source now available here https://github.com/prusa3d/MK2mm_Stepper_switch

[bubnikv]

Documentation has been provided. Closing this issue.

[boelle]

@bubnikv i think you forgot to hit the close button, there are also these other issues that could be closed

https://github.com/prusa3d/Original-Prusa-i3/issues/32 https://github.com/prusa3d/Original-Prusa-i3/issues/30 https://github.com/prusa3d/Original-Prusa-i3/issues/28 https://github.com/prusa3d/Original-Prusa-i3/issues/21 https://github.com/prusa3d/Original-Prusa-i3/issues/18 https://github.com/prusa3d/Original-Prusa-i3/issues/17 https://github.com/prusa3d/Original-Prusa-i3/issues/13 https://github.com/prusa3d/Original-Prusa-i3/issues/10 https://github.com/prusa3d/Original-Prusa-i3/issues/9 https://github.com/prusa3d/Original-Prusa-i3/issues/6 https://github.com/prusa3d/Original-Prusa-i3/issues/1

These ones you might want to pay some attention on

https://github.com/prusa3d/Original-Prusa-i3/issues/16 https://github.com/prusa3d/Original-Prusa-i3/issues/12 https://github.com/prusa3d/Original-Prusa-i3/issues/11 https://github.com/prusa3d/Original-Prusa-i3/issues/8

[bubnikv]

@boelle Thanks for your efforts. I am more on the Slic3r side of the development, it is up to @michalprusa @akukan @ok1hra to close the HW related issues.

[boelle]

@bubnikv @michalprusa @akukan @ok1hra

no problem, since the isue list was so short i read them all and a lot of them did not make sense to keep open anymore. On a few of the issues i have made a comment on why i think they can be closed

[boelle]

@akukan thanks for cleaning up a bit

i made this list of issues that could be closed and you got a few

32

30

28

21

18

17

13

10

9

6

1

[akukan]

@boelle thanks for help, for the rest of the issues some work needs to be done so this will take little bit more time.

[boelle]

@akukan no problemo

currently i'm looking at the DXF's for the MK3, they are not 100% perfect

i have started to make comments in https://github.com/prusa3d/Original-Prusa-i3/pull/36

is that the best place leave comments for mk3 ?