Comments on: State of the art tangle http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/ drawing by robot Mon, 14 May 2018 00:33:14 +0000 hourly 1 https://wordpress.org/?v=4.9.7 By: sandy http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/#comment-1621 Sat, 09 Jun 2012 19:25:29 +0000 http://www.polargraph.co.uk/?p=306#comment-1621 Sorry I didn’t help – but glad you figured it out!

]]> By: ivengo89 http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/#comment-1613 Fri, 08 Jun 2012 19:31:00 +0000 http://www.polargraph.co.uk/?p=306#comment-1613 I’ve broken my problem. I made export from polargraph server not correct:)

]]> By: ivengo89 http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/#comment-1612 Fri, 08 Jun 2012 17:08:53 +0000 http://www.polargraph.co.uk/?p=306#comment-1612 Hello, Sandy! I’ve made this version of Polargraph but have a problem: I cannt Exec file from my sd-card. Maybe because it renaming: when I make file in card I name it “comm.txt”, but when I start terminal I see in it: “COMMT~1.TXT”. Then in polargraph server I cannt start this file.
PICT: s44.radikal.ru/i106/1206/98/2fc1cad0336d.jpg

What should I check?

]]> By: ivengo89 http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/#comment-827 Sun, 19 Feb 2012 12:26:02 +0000 http://www.polargraph.co.uk/?p=306#comment-827 Ok, Sandy, thanks a lot!

]]> By: sandy http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/#comment-824 Sat, 18 Feb 2012 22:09:58 +0000 http://www.polargraph.co.uk/?p=306#comment-824 Hi, there are two problems with using an SD card on an uno –
1) All card shields need to have pins 10, 11, 12 and 13 free to use the SPI bus to talk to the SD card. The motorshield also uses some of those pins, so a motorshield can’t easily coexist with an SD card. The MEGA doesn’t have that problem because the SPI interface is on different pins, so the motorshield can have them all to itself – no conflict. But for this same reason, SD-card shields don’t work on the MEGA.
2) The SD library that I’m using to access the SD cards is really big, (like 15k) so there’s no room left for it on an uno. This is the bigger problem.

Solutions: Modify a bit of the AFmotor library so that the control signals are routed away from those SPI pins on 10, 11, 12, and 13 (http://www.flickr.com/photos/euphy/6062195091/in/set-72157626497662024/), and add a couple of wires to make it work physically. This will get the thing working, just, but might break the servo movement. Then create a very cut-down card access routine that can read commands from a SD card. Also tried this, with a small amount of success but it’s horribly awkward.

The benefit of using the breakout board is that you can wire it up anyway you like – doesn’t have to match the pin layout of the arduino. So it can be used with the MEGA.

]]> By: ivengo89 http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/#comment-823 Sat, 18 Feb 2012 17:11:37 +0000 http://www.polargraph.co.uk/?p=306#comment-823 Hi!
If I’ll take this one SD card shield?:
http://www.seeedstudio.com/depot/sd-card-shield-p-492.html?cPath=109
Can I use Arduino UNO (not MEGA)? Is it the same thing like your micro sd breakout from photo?
Thnx

]]> By: sandy http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/#comment-821 Sat, 18 Feb 2012 10:39:56 +0000 http://www.polargraph.co.uk/?p=306#comment-821 No it’s not smart enough to do any of that stuff – I hit it up with the controller first, home it, set the speed and pen size and stuff, then initiate the drawing from that point. If you load the new mega firmware (I’ve updated the post with the link to it if you can’t find it) the controller will recognise it and give you the saving to store / draw from store options.

]]> By: kongorilla http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/#comment-819 Sat, 18 Feb 2012 02:01:26 +0000 http://www.polargraph.co.uk/?p=306#comment-819 Neato!

Without a UI or endstops, how are you homing it now? Do you just hold the gondola at home until the motors lock on then start drawing? Or are you just drawing some wacky, distorted drawings at this phase?

]]> By: Matt http://www.polargraph.co.uk/2012/02/state-of-the-art-tangle/#comment-818 Sat, 18 Feb 2012 00:33:43 +0000 http://www.polargraph.co.uk/?p=306#comment-818 i’ll have to get that SD breakout, i have a mega, then I can try it out. It looks great. So does it run as soon as you put the card in? How hard would it be to add a LCD display to show what is on the SD card with button interface? Thanks for the pictures. I’m excited to see what you come up with. Great job.

]]>