OpenServo.com

robotjay · Posted: Sun Oct 08, 2006 6:32 pm Post subject:

Dan, yes.

I will construct these boards in quantity and sell them for $20. I've already ordered and receives some parts and I have 150 bare PBCs being manufactured for me right now. I should be receiving those late next week. I've used the small-pcb design that Stefan laid out, because I feel that the smaller version should be able to fit in almost any standard servo case. If anyone wants to buy just the bare boards, I will sell them for $2 a piece. I can sell the bareboards as soon as I receive them, but it will take me a week or two to finish production on the open servo boards. I expect to be able to sell the assembled, flashed, and tested boards by November. Like I said, I will keep the forum posted as I progress. I've already committed myself financially to the project, so I hope that you guys will buy enough from me to have made it worth my while. Very Happy

No matter what happens though, this will be a learning experience for me, so I am honored to do this.
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"Nothing is fool-proof; For we fools are ingenious and will find a way."

ginge · Posted: Sun Oct 08, 2006 6:45 pm Post subject:

I look forward to seeing a picture of one of those. Keep us updated. if you run into anything while building these, feel free to drop me a note. I am sure I have seen just about every error/problem during my use of OpenServo.

Barry
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robotjay · Posted: Mon Oct 09, 2006 2:10 pm Post subject:

Barry, did you ever come up with a cheaper way to flash the boards other than the STK200?
_________________
"Nothing is fool-proof; For we fools are ingenious and will find a way."

ginge · Posted: Mon Oct 09, 2006 2:21 pm Post subject:

yeah, four resistors! Check this out Smile

http://www.openservo.com/forums/viewtopic.php?t=99&highlight=stk200

specifically

http://elm-chan.org/works/avrx/stk200.png

as noted, both work well. In fact, I don't even bother with my buffered version, I just use the el-cheapo 4 resistors (also I have found the values don't really matter all that much either)
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dsandber · Joined: 01 Aug 2006 Posts: 52

Jay, that's awesome!

I'll send extra for a six-pack or what not Smile

Keep us updated!

-Dan

robotjay · Posted: Fri Oct 13, 2006 1:55 pm Post subject:

I jusr received my bare PCBs yesterday, and they look awesome. I paid extra for electrical testing, so they are guaranteed to have a less than 2% failure rate. I made a post in the hardware forum for anyone interested in buying the bare PCB from me for $2.

I ordered the stencil and solder paste a few days ago, I should have them by mid next week. I have already received the MCUs, MOSFETS, Current Sensors, Tantalum Capacitors, and 1/2W resistors. All I need are the small cheap resistors and capacitors, then I can start trying to reflow these boards. Although Barry doesn't recommend reflowing to people trying to do small quantities, I think it'll be perfect for what I am trying to do.

By sheer coincidence, I happen to have a Parallel cable with all of its internal wires stripped and labeled. Making a Programmer for the boards should be extremely easy using 4 resistors and my breadboard. Although, I am unsure from Barry's drawing which pins from the parallel port connect to what pads on the openservo2 board. Also, the resistors in the drawing don't have units on them, so I don't know if those values are in KOhms, or just plain Ohms. Either way, it's just a minor detail. I'll continue to keep you guys updated and I'll make a post when the assembled boards are complete.
_________________
"Nothing is fool-proof; For we fools are ingenious and will find a way."

ginge · Posted: Fri Oct 13, 2006 2:42 pm Post subject:

Hi, good work with the boards.

I hope the reflow works OK for you, I will be interested to see hoe that goes.

RE: the resistors on schematic
they are 330 ohm and 100ohm

The wiring of the OpenServo is as follows:
PCB Top (left to right)

SDA | +7V | GND | SCL/SCK

PCB Bot (looking from bottom. L to R)
+5V | RESET | MISO | MOSI

EDIT: Quickly Drafted this
http://www.openservo.com/moin.cgi/OpenServoPinout

Barry
_________________
http://www.headfuzz.co.uk/
http://www.robotfuzz.co.uk/

dsandber · Joined: 01 Aug 2006 Posts: 52

Jay,

Any interest in making a complete servo for an extra fee? I'd be happy to just get something completely finished!

Cheers,

-Dan

robotjay · Posted: Fri Oct 13, 2006 7:10 pm Post subject:

Dan,

Building and selling complete OpenServos is my next goal, after finishing the boards. In fact, I've already done quite a bit of looking into this. My ultimate goal is to be able to produce a Robo-One style bi-ped sold for under $300, using the robustness of the OpenServo. I'm still negotiating with hardware suppliers, but I think I can have a prototype completed by spring, and a small production run by summer.

It's going to be challenging to come up with the capital for the protos. Unfortunately, I am just a college drop-out, with only the business skills I've picked up on-the-fly while trying to negotiate for Robo-One parts. If there are any people with more business experience than me following this thread, contact me if you have any advice at robotjay@gmail.com.

In the mean time, I'll just take one step at a time to assemble the OSv2 boards. This'll allow anyone in the community to use their own hardware to fit their own needs.
_________________
"Nothing is fool-proof; For we fools are ingenious and will find a way."

linuxguy · Joined: 16 Oct 2006 Posts: 120 Location: Beaverton, OR

robotjay · Posted: Wed Oct 18, 2006 4:52 pm Post subject:

linuxguy · Joined: 16 Oct 2006 Posts: 120 Location: Beaverton, OR

robotjay · Posted: Wed Oct 18, 2006 5:25 pm Post subject:

ginge · Posted: Wed Oct 18, 2006 5:34 pm Post subject:

linuxguy · Joined: 16 Oct 2006 Posts: 120 Location: Beaverton, OR