Maker Faire Bay Area 2016 was a wild ride! If you were able to come to my presentation on tiny drawing robots – thank you! If you weren’t able to make it, I’m sorry I missed you. I got to see some old friends and make some new ones , which is probably the biggest reason I blog and exhibit and present at Maker Faire.
Admittedly, I was a concerned that I would be talking to a bunch of empty benches, that I would run through all of my slides in the first five of my allotted 25 minutes, or that I would be presenting to a completely silent crowd. If you came to the presentation, you got to see that none of those things happened. I started talking to the crowd a little early, answering some questions and letting people try out my demonstration robot with the keypad. When I actually started the presentation the benches were full and there were several people standing around them. There were some really great questions from the audience and lots of enthusiastic ideas.
If you didn’t come to the presentation, you missed both of my daughters making impromptu appearances, one uncooperative robot, one cooperative robot, and you had the chance to grab a “maker card” and actually use my demonstration robot.
As promised, I’ve posted my slides (above) so you can relive the magic.
Drawing Robots at Maker Faire 2016!
I’ll be doing a short presentation on how to build (and operate) a tiny drawing robot at Maker Faire Bay Area 2016. My time slot is Sunday May 22, 2016 from 11:00am to 11:25am at the Make: Electronics stage in Zone 2 aka “Expo Hall.” You can see where I’ve outlined Zone 2 and the Make: Electronics stage in the above picture.
If you’re around, I’d love to see you. However, I know how hectic Maker Faire can be and how difficult it can be to get anywhere. If you want to hang out, I’m planning to go to the Maker Paella Dinner on Friday night on the Maker Faire grounds and the Hackaday meetup on Saturday night O’Neill’s Irish Pub in San Mateo.
Do NOT let this happen!
I want to put some finishing touches on my TinyCNC drawing robot before Maker Faire, but I’m a little ambivalent about how best to show off it’s drawing/CNC abilities. There are several excellent ways to control such a robot – perhaps you can help me decide? My thought is that an IR remote would be really nifty, since I could just hand the “control” to someone and they could play with the robot, getting it to draw something. Then again, feeding gcode to the ‘bot and having it actually draw something semi-recognizable would also be great.
For context, here’s the links to the various possible ideas for control mechanisms:
Please vote above and let me know what you’d like to see working at Maker Faire!
If you’re still on the fence about trying to build your own drawing robot/plotterbot, take heart. (Skip to the bottom of the post if you want to check out the latest 3D printable files and Arduino code.) If a relative newbie such as myself can make a go of it, I’m pretty sure you can too.
Last night I finally got the little ‘bot to really make use of the keypad as a modest user interface. The robot is now using the USB cable purely for power purposes, rather than requiring the serial connection to the Arduino serial monitor as well drawing power from the USB port. Now I can just connect the USB cable to a random USB charging device and operate the robot in a meaningful way by using the keypad.
In addition to the keypad direction system described in a previous post, now the “*” and “#” keys also have a usage. The “*” key now starts and stops the Arduino from logging the inputs. Pressing the “#” key will play the most recently recorded inputs.
My record/playback system is super hacky and the ‘bot sometimes jitters before carrying out a command. I’ll also have to implement a few additional changes to the design of Y axis before it can hold a pen reasonably stead.
But, it works!
Download the latest stable 3D printable parts on Thingiverse, latest Arduino sketch from Github, and play with one for yourself!
I’ve been brainstorming ways to make the TinyCNC better:
- Drawing and Recording.
- My idea is to be able to control the robot through they keypad, perhaps going through the motions for a drawing or to perform a small task, and then have it “replay” the same motions. Ideally, press the “*” key to start “recording,” draw something with the keypad, press “*” to stop recording, and then press the “#” button to replay the motions. Could be nifty!
- Drawing by Remote Control.
- The Adafruit keypad I’m using is great! There are only two, very minor, problems with it. First, it requires 7 input pins, which means that I definitely need a full-fledged Arduino to run the robot, even though it can run off a tiny Adafruit Trinket or Digispark. Second, the buttons are a little difficult for my youngest daughter to press.
- Using an IR receiver sensor, I could use a small IR remote to control the robot – which would be great. Or, I could possibly even use an old remote control from a TV or VCR.
- Changes to Y Axis. The Y-axis tends to “droop” when it is fully extended. If the underside was slightly longer, it could just have a plastic runner that would keep it level.
- Changes to Z Axis. The current Z-axis sucks. It is very wobbly and not able to hold a pen very well. If it had a sliding slot/notch system like the XY axes do, it might not be as bad.
- Changes to X Pinion/Gear. If this were very slightly thinner, I wouldn’t have to raise the X rack slightly off the drawing surface. Or, of course, I could make the X rack slightly taller.
Draw by numbers! Plus the pound and star keys, if you want.
In preparation for Benicia Mini Maker Faire 2016 this last weekend I finally got my TinyCNC working with this sweet Adafruit numeric keypad! Now using the robot is so easy, even a 17-month old can operate it!
I’ve programmed the ‘bot to interpret to move as follows:
- 4 = Left
- 6 = Right
- 2 = Back
- 8 = Forward
- 5 = Up
- 0 = Down
I believe the directional keys move the ‘bot in 3mm increments, but this is easily adjusted in the code to whatever you prefer. I’ve also set the 1, 3, 7, and 9 keys to move in the four combinations of X / Y max / min travel.
Print a TinyCNC for yourself by getting the STL’s on Thingiverse. Also, I’m still getting the hang of this whole GitHub thing, but if you have a similar keypad and want to give the Arduino sketch a shot, check it out here. You’ll want the one entitled, “TinyCNC Keypad.”
Here I am!!!
Here’s where I am at Maker Faire! Back of the Expo Hall. Look for the booth decked out with lots of drawings!
My daughter brought her “How to Make Super Awesome Puppets” display and is sharing the space. You can’t miss us!
Draw on the go with a small Arduino-powered CNC robot!
Well, technically, ON a box.
The wiring is really simple. A small breadboard is used connect Arduino pins 10, 11, 12, power and ground to the three servos. The keypad is wired directly to pins 2 – 8 on the Arduino. That’s it.
Wait… that’s all there is to it?!?
Of course, it doesn’t work. Yet. 🙂