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46  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 08, 2012, 04:16:40 am
Ok, just a thought. Stick with whats easier. if you cant add the header, then dont worry. i think i would be able to get a double sided board if needed, but for being easier's sake, i think single sided might be the go.
47  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 07, 2012, 07:37:56 pm
Hi, I'm
Happy just to use another arduino, rather than the cp2102. But if it's too much trouble, don't worry about it, I can always take the chip out to reprogram it. It's just easier not to.

The servos I'm using plug goes signal, power ground.

Would it make it easier to stay single sided if you added holes for small jumpers instead of changing sides when you can't cross another wire?
48  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 07, 2012, 10:21:14 am
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Have to see how slow the Olympics are going
sure man, in your own time. i cant complain about free support. smiley-razz
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Pot has 3 pin header for power, wiper, gnd.
ok, i see that now.
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Aref has cap to gnd only, does not connect to 5V - that's taken care of internally.
VCC/AVCC get 5V and a cap to gnd.
thanks, understood.
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I don't know what you mean by A6
sorry, a6= rst. its labeled as a6 on all the chips ive bought.
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I wired it like you drew it tho.
i may have drawn it wrong, and possible soldered it all together wrong. its meant to be just a reset switch. and be part of the header (8 pins)
rst, D0, D1, D13, D12, D11, gnd, 5v (think i may have missed 12 previously.)
basically i copied this:
49  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 07, 2012, 08:21:35 am
CrossRoads, ive had a bit more time to go over the picture you last uploaded. Can we put in a hole for pins:
  • next to the servo pins for power and ground.
  • Ground for POT, i see you have already powered it
  • power and ground for the LSM303
  • move all the ones marked header/serial next to each other and add power and ground in and 8x2 row. ( i use a USB header cable to connect to an arduino for programming.)
  • can we add a 7809 for 9v power so it can be powered off 12v and still supply both 9 and 5 volts?


other questions:
what is it you have put on the aref and avcc that goes to ground?
what is it on A6 that goes to power? i see a resistor and something else. and i dont see where it connects to the header.

thanks heaps for doing this btw smiley-grin theres no way i could knock that up as fast as you did. smiley-eek
50  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 07, 2012, 03:36:51 am
OOHH, i forgot about something...

i want to have it powered by from a car battery, 12v. which the 7805 will be ok fro 5v, but the dc motor is 9v. so just need to add that in and send power to the motor.
51  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 07, 2012, 01:02:22 am
Cool,
is there some sort of scale? in mm.
can it be viewed, just the board? i think ill try get it cut in cardboard or plastic. something cheep to see if it all lines up before i do it on pcb material.
52  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 07, 2012, 12:22:47 am
wow, that already looks really awesome. smiley

i thinking that it will need to be single sided. As the board will only have copper on one side, I think(?). not 100%

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Do you need it single sided?  Any specific trace widths or clearances?
im not sure what you mean.
53  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 06, 2012, 08:21:44 pm
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That would be easy to draw up in eagle
easy if you know how...
attached to the board:
- buzzer  (just a pc case piezo)
- pot (needs to be accessible from outside an enclosure, so maybe attached, maybe not?)
- 2x switch (needs to be accessible from outside an enclosure, so maybe attached, maybe not?)
- relay

the LSM303 need to be far away from the motor as it interferes. so not on the board.

i will need to use a different relay, the one i have is archaic and shit (suggestions?). the switches can be any momentary on push buttons.

im not 100% that my transistor set up is the best. It takes the relay to ground when the pin is HIGH. Ive used a BC548 to do it. But, it was my last one, and i stupidly hooked up the power backwards, now the smoke has fallen out. smiley-sad i have a more BC558 but i dont think they will work.
54  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 06, 2012, 06:59:53 am
i think its one of these they have:
http://www.troteclaser.com/EN-US/LASER-MACHINES/MID-SIZE/Pages/Speedy300.aspx

someome else has already done it
http://halfbakedmaker.org/2012/05/16/printed-circuit-boards-with-a-laser/
55  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 06, 2012, 06:51:39 am
more
56  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 06, 2012, 06:49:58 am
some pics of the prototype
57  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 06, 2012, 06:12:18 am
here is possibly the worst ever schematic u will ever see. im not too good at it as im sure you can tell...
58  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 06, 2012, 04:17:23 am
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If you have the power cranked up to etch through the copper then wont it cut through the PCB as it breaks through the copper?
   
Well, its sensitive enough to burn away 1 layer of paper. if you glue 3 or 4 different coloured pages together and design something on the computer it can take away one 2 3 or cut through all of them. the end effect is cool. anyway, point is, i think it will be ok. will find out when i try i suppose.
59  Using Arduino / Project Guidance / Re: Desing a PCB to be laser cut. on: August 06, 2012, 12:08:13 am
hi guys,

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You will need an above-average laser cutter for that.
well ive seen this engraver in action. It mainly used for engraving stainless tags for electrical cables for mining companies. Its pretty big. costs bout $20000 for one, so not really economical for someone just to buy. but i know them through my job. Im actually the one who set it up for them originally. its pretty cool. im sure it wont have any issues cutting a thin layer of copper.

i dont have a schematic, ive got my working prototype. its just very messy and i want to tidy it up a bit. Ill post a photo of it and draw the schematic up tonight. im at work at the moment, so itll be a few hours.
60  Using Arduino / Project Guidance / Desing a PCB to be laser cut. on: August 05, 2012, 04:38:42 am
Hi cleaver people of the forum.
I want to get a PCB made but all chemicals are processes to etch a board with laser printer and acid is a bit much for me. I have access to a laser cutter/engraver. so i was thinking if i could get someone to help me design it i can get it made pretty easily.

All we need to do is get it in a format that the laser machine reads. Ive done other stuff with it before. basically it just prints from Corel. Its in scale and it is set up as a printer via USB.
As for holes and what not, In the drawing, RED lines are for CUTTING and BLACK is for ENGRAVING. Engraving will remove the copper top off the board.

now, the hard part, i dont have a schematic. ive looked at eagle and its pretty hard. i could draw it on paper and scan and attach it so you can recommend what to do.

thanks
gr0p3r
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