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A project log for The Square Inch Project

A contest to create awesome, useful square inch boards. Entries are closed.

alphaninjaalpha_ninja • 09/29/2015 at 00:10•237 Comments

If you'd like to enter, please post a link to your project's page as a comment on this project log!

Some reminders:
You don't need to have your PCB's schematics or circuit design finished to enter.
Each user can enter up to 10 PCBs. [One PCB per project.]
Your PCB can be smaller than 1x1".

Entered projects are listed here:

https://hackaday.io/list/7909-square-inch-project-entrants

ENTRIES ARE CLOSED.
Previous log

How to Enter

09/28/2015 at 23:53 • 2 comments
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The Two-Week Mark

11/10/2015 at 14:07 • 7 comments

Discussions

Furkan Çetin wrote 10/08/2015 at 11:14 • point

My apple of eye. Is "Eyeduino" a better name? :) Just 18mm x 18mm!

https://hackaday.io/project/7989-pointduino-mini

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alpha_ninja wrote 10/08/2015 at 13:33 • point

Beautiful! One small tip: It would look even better if all the vias would be hidden under the µc...

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FrazzledBadger wrote 10/08/2015 at 05:21 • point

Another of my idle musings:

https://hackaday.io/project/6335-wedding-led-doodads

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alpha_ninja wrote 10/08/2015 at 05:27 • point

The doodaddery is strong with this one.
I've added it :)

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Luc wrote 10/08/2015 at 01:17 • point

https://hackaday.io/project/4819-simple-electronic-compass

I had planned to make it small, but I'll be making it fit the 1"x1". Still in progress.

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alpha_ninja wrote 10/08/2015 at 02:12 • point

Good luck—I've added you!

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Christoph wrote 10/07/2015 at 20:59 • point

Nothing too fancy but fits in 1x1:

https://hackaday.io/project/4277-stm32f030f4p6-breakout-board

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alpha_ninja wrote 10/07/2015 at 21:09 • point

Added!

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zakqwy wrote 10/07/2015 at 20:46 • point

Oh, uh, thanks. Just saw this log. Ignore my previous request, I'll come up with a project first :-/

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alpha_ninja wrote 10/07/2015 at 20:47 • point

Sounds good :)

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alpha_ninja wrote 10/07/2015 at 13:32 • point

You're in :)

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alpha_ninja wrote 10/06/2015 at 13:45 • point

Nice, I added you

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Daniel wrote 10/06/2015 at 14:00 • point

Thanks!

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alpha_ninja wrote 10/06/2015 at 00:44 • point

Added!

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jeff wrote 10/05/2015 at 04:19 • point

https://hackaday.io/project/7947-quadcopter-in-one-inch

tiny flying machine

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alpha_ninja wrote 10/05/2015 at 04:37 • point

I'll add you. Double-check those pads for the QFP, though!

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jeff wrote 10/06/2015 at 23:22 • point

thanks.

QFN actually. no pins.

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alpha_ninja wrote 10/06/2015 at 23:35 • point

Ah, ok—were they okay? they looked quite cramped.

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danjovic wrote 10/05/2015 at 02:08 • point

https://hackaday.io/project/7944-at26-chuck

Adapter for playing Atari 2600 with Wii Nunchuck. Let's try a through hole design this time.

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alpha_ninja wrote 10/05/2015 at 02:30 • point
Added you :)

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danjovic wrote 10/04/2015 at 21:29 • point

https://hackaday.io/project/7941-avercade 

Customisable USB adapter for arcade controls based on AVR wit V-USB and USBASPLoader.

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alpha_ninja wrote 10/05/2015 at 01:08 • point
Added!

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f.lazar wrote 10/04/2015 at 14:13 • point

https://hackaday.io/project/7932-trackthor

Not one, but 3 boards under 1 inch. Actually one in 26mm long not 25.4 because of the chip dimension. But i can cut easy 0.6 and have the top chip bigger then the actual pcb. So, am i disqualified? 

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alpha_ninja wrote 10/04/2015 at 14:35 • point
You're not compliant with the rules because each project is permitted no more than 1" of PCB space (panelized!) What you could do is have sd card reader and battery holder be separate modules (that are usable on their own, even with other devboards) and enter them separately

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f.lazar wrote 10/04/2015 at 14:50 • point

correct, but then what's the fun? that would be 3 pcb's with no individual functionality that can be of interest. They work as whole and that is the fun: 3 pcb's under 1 inch each, can give a fun device within a cube inch of PCB's. :-) Thanks anyway.

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alpha_ninja wrote 10/04/2015 at 14:55 • point
That's not compliant with the rules though, sorry. I like the cube-inch idea though, we could do that the next time around.

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alpha_ninja wrote 10/04/2015 at 03:23 • point

added!

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alpha_ninja wrote 10/03/2015 at 15:00 • point
Not sure you saw the other comment: projects can be smaller than 1x1 inch too!

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alpha_ninja wrote 10/03/2015 at 15:04 • point
It's on the list!

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alpha_ninja wrote 10/03/2015 at 15:04 • point
Added

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Piotr Esden-Tempski wrote 10/03/2015 at 06:40 • point

Hi I would like to submit the Lisa/S UAV autopilot to the contest.

http://wiki.paparazziuav.org/wiki/Lisa/S

It is a 20mm x 20mm (0.619sq/inch) fully autonomy capable autopilot. Even when you add on the 2.4GHz RC control and telemetry module (CyRF) it is still less than an inch of surface area: 0.852sq/inch :)

Here also the link with some better photos:

http://1bitsquared.com/collections/autopilots/products/lisa-s

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alpha_ninja wrote 10/03/2015 at 06:46 • point

Piotr,
Could you create a hackaday.io project page for your project so I can add it? Thanks!

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alpha_ninja wrote 10/03/2015 at 07:20 • point

Added you to the list!

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Philip wrote 10/03/2015 at 05:45 • point

This is such a cool contest. Did you create it just for me?  I would like to enter my OSHChip_V1.0 project.

https://hackaday.io/project/7212-oshchip-v10

At .350" x .780" it comes in at .273 square inches, so almost 4 copies per square inch. Can I enter 4 times :-)

It is a Cortex-M0 processor, 32K RAM, 256K Flash, assorted peripherals and Bluetooth Low Energy radio (nRF51822) packaged as a 16 pin DIP. 

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alpha_ninja wrote 10/03/2015 at 05:59 • point
Now that is some precise documentation. I'll add you!

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Yann Guidon / YGDES wrote 10/01/2015 at 15:59 • point

Not my work but what about #DIPSY?

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alpha_ninja wrote 10/01/2015 at 16:42 • point

If @antti.lukats wants to enter...

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alpha_ninja wrote 10/01/2015 at 18:11 • point

There's no minimum size.

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Cedric Honnet wrote 10/01/2015 at 13:40 • point

Check out the Twiz, it's a 1 inch square IMU (9 degree of freedom) that sends data over BlueTooth (Low Energy):

hackaday.io/project/7121-twiz

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alpha_ninja wrote 10/01/2015 at 14:04 • point

I've added it!

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Cedric Honnet wrote 10/02/2015 at 11:25 • point

Thanks ;)

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matseng wrote 10/01/2015 at 06:06 • point

Submitting my entry to this contest - HIZ , a Human/Infected/Zombie multiplayer game inspired by a recent post on the  HAD blog. 
https://hackaday.io/project/7900-hiz

  Are you sure? yes | no

alpha_ninja wrote 10/01/2015 at 13:07 • point

I'll add you. Just so you know, you can make the board smaller than 1x1".

  Are you sure? yes | no

matseng wrote 10/01/2015 at 14:15 • point

Then I'll have to change the cr2032 into into a cr1220....  Hmm... yes. maybe that. But the battery lifetime will be severely affected.

But it would be rather cool to fit 9 pcs of the design onto a cheap 5x5cm pcb.

  Are you sure? yes | no

alpha_ninja wrote 10/01/2015 at 16:41 • point

You don't have to! If you would, maybe you could have two stacked? I think I remember some coin cell battery holders that did that. I was just pointing it out since the front had a lot of unused space.

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Hacker404 wrote 10/04/2015 at 08:21 • point

I bought some 'super capacitors' or 'gold capacitors' the other day to replace a button cell. I didn't do the math as to how long a charge would compare because my reasoning was reliability. A one Farad (1F) super capacitor is quite small. 

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matseng wrote 10/04/2015 at 13:28 • point

I think you might want to do the math anyways....

If I remember correctly a 1F 2.5 volt capacitor can hold just a bit over 1 Joule of energy.  A bog standard CR2032 is about 1000J  if discharged carefully.

That is three orders of magnitude in difference!

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Hacker404 wrote 10/04/2015 at 19:37 • point

How are you doing the math? I am using a 5v 1F cap - charging to 3v and then discharging to 2v and I get 277mAH for the capacitor when a button cell like CR2032 is about 225mAH. 

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matseng wrote 10/05/2015 at 07:08 • point

I didn't do the math. :-)  I just picked rule-of-thumb values out of the top of my head.  But let's do the maths and see...

Energy in a cap in Joules is 0.5*C(V2)

So you capacitor charged to 3 volts is holding in total 0.5*1*(3*3)=4.5 J if discharged all the way down to zero volts.  You are only discharging down to 2 volts so there will be less.  

So let's approximate that by taking the energy at 2 volts in the cap can subtracting that from 4.5J.  0.5*1*(2*2)=2J  4.5J-2J = 2.5 Joules extracted from a 1F cap during discharge from 3 volts down to 2 volts.

Ok, so let's look at the energy in a CR2032. 1 Joule is 1 Watt during 1 Second.  As you said a CR2032 is about 225mAh and at 3 volts that will give us 0.225*3=0.675Wh.  Multiply this by 3600 to get down to seconds and you'll end up with 0.675*3600=2430 Ws = 2430 Joules.


2.5J vs 2430J is almost exactly three orders of magnitude....

So.... How did you measure the 277mAh for your cap?  Are you sure it's not 277 miliamp seconds?

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Hacker404 wrote 10/05/2015 at 08:04 • point

I used coulombs and I am still looking for where I went wrong. 

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