doodle clock #2

by ekaggrat, published

doodle clock #2 by ekaggrat Oct 8, 2015
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doodle clock #2 by ekaggrat is licensed under the Creative Commons - Attribution license.

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i built the first doodle clock http://hackaday.com/2012/03/14/robotic-doodle-clock/ 3 years ago as a joke. But to watch the clock work was so mesmerizing that i wanted it to be a practical desk clock. The biggest problem with the first clock was the drying up of the markers after just 30 minutes of working. So the solution to that i found was the magnetic writing boards http://www.walmart.com/ip/Fisher-Price-Doodle-Pro-Basic-Purple/26012794 made for children. I used 2mm cylindrical magnets inside a solenoid to write and erase the text. Next i replaced the servos with small geared steppers to make the clock very silent and smoother. And finally all parts were designed and 3d printed . I also got the final pcb manufactured .



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This is amazing! Thanks for sharing!

Are the PCB files available for download anywhere? I plan to make your most recent clock torlo (unless you have any other hidden surprises for us) but this clock would be something my little brother would flip out over. I know how much of a headache designing a PCB can be as im still pretty new at it and my Attiny85 breakout boards took me a while and a few tries so i understand if youre not willing to just hand out the files. But if thats the case could i buy 1 of the PCBs off of you?

you need pcb for torlo or doodle? i think you posted the comment in the wrong place.. as far as torlo is i have a temp pcb layout using a attiny 2313 which i plotted on my printer and then etched it. It is a very hacky board and i removed a few components to accommodate it under the clock. also i used a over sized mosfet ( to22 package ) and cut it to fit the board ( removed the heatsink ) . so if you are will ing to do that i will share the eagle files. I will redesign the board later, right now torlo has some snags which popped out on longer runs which i am trying to remove... :((

Im actually interested in both. The torlo is for me and the doodle is for my brother. I appreciate you getting back to me.

frankly speaking doodle is a very hard build because of the coils needed. The overall cost of pcb and parts was high and a kits cost couldnt be justified... I could provide u pcb files for both but personally i would avoid doodle for now. you could just build a plotclock ( ripped of doodle ) for now. .. thanks

Hey Ekaggrat!

Big respect for your work here, totally awesome job .
I already printed your Holo Clock (will post pictures) and am now up to making my own doodle clock. At least i will try to because i dont know if my coding skills will allow me to get there.
Would you be so kind to release or send me your code since i only managed to do basic arduino coding and think that modifying your code to fit my hardware would already hit my skill ceiling.

Thanks for the stuff you already shared!

Please go to the hackaday page for more details and code. It was a very difficult build even for me. The hardest part are the coils . They are basically brass pipes with cylindrical magnets moving in and out with the coil

Are you selling these complete anywhere? I have a 3D printer, but none of the smarts to actually complete this! I NEED this in my life!!!

unfortunately no but i can do a one off. But i am not sure if the cost would be acceptable to you..

Are you talking hundreds of dollars?

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Hey mate, super keen to make on of these. Can you suggest any edits or have you make an upgrades?
I'm in particular interested in the text darkness, scratching and writing speed :)

the text darkness depends on the product you use. ( magna doodle or any clone ) also i have noticed that the cell size on the recent magna doodles has been increased effectively reducing the resolution so look out for that . the speed can be increased if you have the expertise to rewrite the software. one thing you can experiment with is to sandwich the board between 2 thin .5mm polycarbonate sheets to avoid scratching. the coils are the toughest parts to make. Also i used opto switches to home which complicated my electronics. A simpler approach is just to use A3144 hall sensors and small magnets. As for the pcb you can get away by using a arduino+ramps clone if you cant get a pcb made.

I want to make one but need more info on the coils and the software to drive it.

How do you set the time?

i love how when it erases it looks like it fist pumps!

I would love to make one of these with my nephews, do you have a write up on it so I do so?

i can help you anytime. the hardest part is the coil.


for more info contact me ekaggratatgmaildotcom.