I’m reading up on reassigning the fan to 5V pins for a laser, and I’m getting lost translating pins in the firmware to the physical connections on a RAMBo 1.4 board.
Has anyone found a good, detailed RAMBo 1.4 resource with this information? (Not just this one pin… I want to know all of 'em.)
If it doesn’t exist yet, I’d be happy to scribble up some pictures, with a little guidance to get me started on figuring it out.
The rambo wiki is linked in a few places and has all the pins listed.
https://reprap.org/wiki/Rambo
Although the Wiki does not address V1.4
“RAMBo v1.4 - The major difference over the previous version is the integrated LCD connector for Smart LCD Controllers. The EXT2 and SPI headers were re-arranged to remove the need for an adapter. This change is backwards compatible with firmware for previous versions of Rambo that normally utilize the RamboLCD.”
Thanks Ryan! That’s the bit of data I was missing.
I am also planning to install a 12v laser with TTL control. As with above request, it would be handy to know just where on the Rambo 1.4 board the appropriate pins are. I’ve read the very detailed instructions for the miniRambo use for this but don’t want to be guessing which physical pin is #44 and Gnd for the TTL connectors. There are a variety of pictures of past versions of the RAMBo board on the RepRap wiki site in various copper layers etc which are unhelpful. Any less obscure suggestions? Thanks for any pointers.
https://www.v1engineering.com/the-2-8-watt-100-laser/
Crystal clear with some of the best pictures ever, still not sure how he did it. The directions for all boards are actually the same, we were just trying to decide what pins for the mini that would also work for the PID, all other boards have the rest of the PWM pins broken out.
We just went on a tangent trying to easily convert the 12v to 5v, turns out, much easier to just flash firmware.
Sorry I read that as Ramps.
On the Rambo, the first pin of MX2 is pin 45. That is the one to use, the firmware I release will use this one, next to it will be enable if you need that, Ground is also marked.
When I release the PID/laser firmware that will be already done. You will use M3, instead of M106. If you need more details, start a new thread and we can finalize all the details there.
Crap…the spindle needs a start up delay and the laser does not. It is never easy…
Updated with laser info.
Thanks very much for the prompt reply. I suspect there are many of us who want to add a laser to your already versatile machine. The pictures do help a guy avoid frying the board with experiments. I also realize I need to solder in a 10k ohm resistor on the back side between 45 and the - pins so I don’t get fried when I first plug in the laser. Cheers.
If you don’t have a driver with an enable pin than yes you can use the pulldown, the easier place for it is on your wires you plug in.
I went out and had a closer look at my Rambo 1.4 board. A pic is attached I hope ; ) The bad news is your stock photo must be of an old fashioned Rambo 1.3 board and they’ve played musical pins since then. Mine is a modern Rambo 1.4a board recently from V1 so your picture is not as helpful as I hoped. The target area is conveniently located by the thermistor pins. The + and - are clear but now now there are three banks of pins. The good news is this board has 5 more pins for you to play with so maybe your spindle problem will have a happy solution.
Cheers
Those are the exact pins from the exact board. Row MX2, my labels are covering MX1.
I guess your label in the Ultimachine reference link covers up the lowest rank of pins - on purpose for clarity I’ll assume.
Sorry, should have looked closer : (
Well that was the idea, I was trying to get it done quickly and used a screen shot. I will take a proper picture soon.
