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While it could be a crystal problem (timekeeping crystals used in commercial products
are often 'binned' parts that far exceed the 20ppm specification), I would get that
RTC circuit off of the breadboard first. The stray capacitance of a solderless breadboard
causing havoc with timekeeping...
I don't know about your code, but check to make sure that you are using the correct watch
crystal with the 1307. It needs to be 12.5pf. Also, are you working with this circuit on a
solderless breadboard? Years ago I had an RTC (NJU-6355, IIRC) that ran either fast or slow
on a breadboard, but...
Your ISP is basically reselling you bandwidth, so the more you use, the more it costs them. That's the simple explanation, but there's more to it than that, of course.
Why does bandwidth cost money? - bandwidth isp cost | Ask MetaFilter
It's a shame that the designer opted in the end to use a microcontroller. Even so, it's still quite impressive, and a reminder about how spoiled modern designers are, since today all of these TTL parts can be replaced by a simple, cheap uC and a bit of code.
Re: IC DIP socket tricks
One way to straighten pins for insertion is to 'roll' the IC on a flat surface, bending one side at a time.
A better way to do it is to use a proper IC pin straightening tool. Once you use it you'll wonder how you ever got along without it.
Tools - IC
ICS-01-R...
K2DGR8,
It depends on the module, but most current ones support standard NMEA183 output. You'll set up the GPS to output the
sentence of your choice (for instance, for lat/long, you would pick the GGA or RMC sentences). From there it's just a matter
of reading in the string and parsing it in...
I know you said there were many displays, but this is MANY displays. Holy smoke! LOL
Do keep us updated. I'm looking forward to seeing your progress and the finished project.
Nick C.
The nice thing about the hobby servo-driven arms is that servos are closed-loop, so positioning can be fairly precise and repeatable. The OWI arm is open-loop. Still, there are lots of projects/videos online of people hacking the OWI for their own uses:
If you're not in a great hurry, see if you can get the wire elsewhere. Digikey is fantastic, but for some reason they gouge you on things like wire and solder. I got sticker shock recently when looking at their wire prices. I remember ordering 28ga wire from Radio Shack's online store some years...
This is the sort of task that's a perfect fit for the PIC10F200 microcontroller.
It's tiny (about 3mm x 3mm) and costs about $0.30 in quantity. No external components required.
That was the Armatron. I still have mine from the early 80's. IIRC, there were two versions - one with an easily hackable interface and the other one relying on an insanely complicated electro-mechanical gear system that used only a single motor to control all movements. Imagine that - six...
Good and cheap don't usually fit together well, especially when talking about robotics. What is your budget? $50? $5000?
On the lower end, there's something like the OWI-535 for about $40. If you are thinking of a 'real' industrial robot arm, you're
looking at several thousand dollars (used).
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