Get the SoR Robotics Android App on Android Market for FREE. See this forum post for details.
0 Members and 1 Guest are viewing this topic.
Nyx,Where abouts in Canada are you? I live a couple hours west of Toronto, and have a Sherline milliing machine/lathe setup, so I can machine small parts (like axle-wheel hubs) from brass/aluminum/plastic.If you have some cash to spend on this, I would strongly recommend you get a commercial, serial-controlled motor speed controller. There are any number of places that sell them, depending on how much current you need to push...- Jon
http://www.dimensionengineering.com/Sabertooth2X10.htmYou will need either a serial transceiver chip or a USB -> TTL converter.USB: http://www.sparkfun.com/commerce/product_info.php?products_id=198I don't know where you would get a serial converter (max232), but there are a ton of places that sell them.- Jon
With the USB -> TTL converter, you could hook that directly up to the Speed controller I linked to before (from DimensionEngineering). Then, by sending simple commands over your serial port, you can control the speed and direction of your two motors.- Jon
No, that won't do it - that device (and a normal DB-9 serial port on a computer) produce what is known as RS-232 level voltages. which vary anywhere from -12 to 12 volts. TTL level voltages are 0 and +5 volts, and are what micro-controllers typically deal with.The speed controller I referenced has a TTL-level serial interface, which means you must use a USB -> TTL converter to talk to it. The part I referenced from Sparkfun is that. You're not likely to find something like that at a consumer-level electronics store, because most non-electronics people don't know the different between RS-232 and TTL.- Jon
Well, I don't like the idea of soldering directly on the board... I found this, however (see link below). The ideal find would be one of those USB->TTL adapters with some screw-in connectors.http://apple.clickandbuild.com/cnb/shop/ftdichip?op=catalogue-products-null&prodCategoryID=47&title=Cables:+TTL-232R
A marine deep cycle battery, 30+ AH
my mom will make those for me, heheh, no joke
One of my main problems is that i'm not well equipped to fix the motor to a wheel, and to fix the motor to the chassis. The motor has its screw-holes on the front, where the axle comes out to attach the wheel.... In the worst case, I might make a hole in a wood block, stick the motor in it, and fill the hole with glue (yes, I know, how ghetto eh?).
just found this by accident/coincidence . . .wheel hubs:http://www.servocity.com/html/hubs___adaptors.html(the four holes screw into your wheel, and the other screw is for the motor shaft)
You suggest NiMH battery packs, but don't those suffer from memory effect? Also, how expensive are we talking? I can get a 90 AH 12V deep cycle battery for $80 or so.
it needs to be precision made so it doesn't fall apart when you put it together