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  1. Like
    AaronInSpace reacted to DavidEQ in Non-ADC-driven PWM servo control with Launchpad   
    Old analog scopes go real cheap anymore, maybe $100 or even free to a good home. Almost like kittens.I got a new Rigol scope I love for $400 digital with all the bells and whistles, 50 Mhz but easy hack to make it a true 100 Mhz if you need to, software only. I have not done it yet no need 50 is fast enough so far.
    Cheap ones on ebay:http://business.shop.ebay.com/Oscilloscopes-/104247/i.html?LH_Price=..100%40c&rt=nc&LH_ItemCondition=3000&_dmpt=BI_Oscilloscopes&_fln=1&_mPrRngCbx=1&_ssov=1&_trksid=p3286.c0.m282
    One I just bought new and love http://www.saelig.com/PSBEB100/PSPC016.htm
  2. Like
    AaronInSpace reacted to gordon in Where to begin...What to buy   
    The 24-pin one is TSSOP. There is a DIP 20-pin variant, which is compatible with the LaunchPad. You can sample these (you can get 2, IIRC), but actually buying them is a bit of a problem as of now (TI probably hasn't ramped production up yet, these chips are fairly new).
  3. Like
    AaronInSpace reacted to zborgerd in Where to begin...What to buy   
    Yes. I personally have a 20-pin DIP G2553. You will lose a few IO over the 24 pin (or something along those lines). I think that it's only 16 GPIO.
    Look on the product page at the pin/package types: http://focus.ti.com/docs/prod/folders/p ... g2553.html
    Click "samples" and go the the 4th line (PDIP). Then click "Add to cart".
  4. Like
    AaronInSpace reacted to zborgerd in Where to begin...What to buy   
    I/O might be one of your biggest limitations on the Launchpad (not memory). Same would apply to an Arduino UNO (though probably not the Mega). Thought there are certainly ways around that by interfacing other circuits.
    Launchpad is $4.30, and as Gordon suggested - The MSP430G2553 is pretty cheap and will increase your flash to 16 KB. You can probably even get free samples sent from TI. If you find that you need a bit more I/O and still want to keep the price down part-way through the project, then you should be able to easily modify your code for the new FraunchPad:
    http://focus.ti.com/docs/toolsw/folders ... r5739.html
    They are currently $15 with half-off promo code that is noted on 430h's main page (I haven't heard that it's expired yet).
    And if you think that you need even more memory and IO, then you are going to have to start looking at some other options. But you can program any Spy-By-Wire MSP430 with the Launchpad's emulator. You will reach a 16 KB limit with Code Composer Studio v.4 free edition and will need to use MSP430 GCC (as many of us do).
  5. Like
    AaronInSpace reacted to gordon in Where to begin...What to buy   
    Welcome on board!
    You will probably be right at home starting off with MSP430, especially if people around you already use it. I have no particular experience with robotics as such, but stick a ~$2 MSP430G2553 (currently the biggest MCU the LaunchPad supports) in the $4.30 LaunchPad, and you already have a pretty beefy setup to start with. At 6 bucks, you can't really go wrong .
    Olimex makes some nice starter kits at pretty reasonable prices, if kits are what tickle your fancy. However, the LP is all you need to interface with any MSP that supports being tackled with Spy-Bi-Wire (which is most of those you want, at least for starters), so if all else fails, you can just get an LP for programming, and any beefy MSP430 (where I believe even the bigger ones are under $10 or thereabouts) on a breakout board, and there you fly.
    All in all, even in the very unlikely event of you realizing this is not your keg of beer, the whole experiment will have cost you about $20. Whether or not you are willing to risk this is up to you, but I don't think you can go too wrong.
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