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Sivat

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  1. I have just ran across some Olimex MSP430-P1611 boards and was wondering what people used to program them, and this thread seems to be relevant! If the Olimex parallel JTAG is not used, what is a (hopefully cheap) alternative? (Note that I am pretty much a rookie when it comes to microcontrollers...The only things I've really programmed have been on the Launchpad through USB.)
  2. Hey all, I just got a $50 gift card to Amazon for Christmas and I was wondering what cool things I could get with it? If you had $50 to spend at Amazon, what neat little toys would you buy? Some things I already have: - 1 launchpad (with a sample of the best DIP MSP430 chip) - 1 cap-touch booster - 1 MSP-EXP430FR5739 board - 1 servo and 1 DC motor - The magician chassis from sparkfun - 1 LCD screen (16x2) - Ping sensor - Basic tools needed (i.e. simple soldering iron, strippers, needle nose) - A couple small breadboards - A handful of component kits (i.e. resistors, ceramic
  3. Very cool! By looking at the schematic it can be run using 3 pins (data, clock, enable on LCD) with a shift register or 5 pins (4 data pins and an enable) using the LCD directly. Is this correct?
  4. Sivat

    BJT H-Bridge

    Very cool! Having more control over the motor with the same number of control lines is great since I am only using the pin-limited versions of uControllers. One question: Can the 'top' transistors be turned on with ~3V at the base? (I say 3V since that is about what my LP is putting out). I would think they have to be at something like 1.4V (2 voltage drops across the 'top' and 'bottom' transistors) + V_drop_motor (which, after looking up the spec for my motor, is about 3V).
  5. Sivat

    BJT H-Bridge

    Bear with me here, but: Starting at the ground connection at the bottom, we have 0V There is roughly a 0.7V drop across the base to emitter of a transistor so the voltage at the base of both of the 'bottom' transistors should be 0.7V. Working our way up, there is again a 0.7V drop across the base to emitter of the top transistors so the base voltages at the top are roughly 1.4V. Now, if we were to use the same signal to drive both the top left transistor and the bottom right transistor with the same signal (as described in the first post) the voltages are going to be different at t
  6. This sounds great to me. I am interested in learning Eagle. Any chance the tutorial could be recorded as well?
  7. Sivat

    BJT H-Bridge

    How would one make an H-bridge with BJTs of the same type? What type of circuitry would you use to get the 'correct' voltage for both the 'top' and 'bottom' transistors?
  8. Sivat

    BJT H-Bridge

    Thanks for your reply jsolarski. Well, I ended up soldering this to a small prototype board, trying to keep everything really close and tight, but I found that there was a short somewhere (I can't find it though!). So I put it together on a breadboard instead to see if it was the design that went wrong or something else. Turns out it works =) I have this hooked up to a little motor and my Launchpad right now and it is working like a charm.
  9. Sivat

    BJT H-Bridge

    Hello everyone, I am new to these boards. I've been snooping around for a few weeks, and have finally come to you all for some help! Hopefully I have done enough research to ask intelligent questions . I have attached my proposed design for an H-bridge (drawn up in Microsoft Office, so please forgive me for any visual problems with the design). I am using 2N3904 and 2N3906 transistors, 1/4W resistors, and some diodes I got off an old oven LCD display (not sure what the part number are for them, but they are orange and black). The two signals 'a' and 'b' will be coming from two
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