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hvontres

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Everything posted by hvontres

  1. Sounds great, would this be for Nov or for Dec? Nov might be bit early, since a lot of Bords won't get shipped till mid-Nov (mine )
  2. Darn you... I also wound up getting one of these... to "save" on shipping http://www.micro4you.com/store/logic-analyzer-24mhz-8ch.html
  3. Hmmm... does anybody with a 9/4 order date have a ship date earlier than Nov 16? I have a project in mind and am getting impatient.... Can't wait to join the blue smoke club at home.... I am already a memeber at work... (fun with servo drives and motors....)
  4. Grrr... mine still shows Nov 16.... I guess I shouldn't have ordered them together with two more launchpads....
  5. I think trying to get 4 Motors to stay in sync and to have the right throttle response might be a bit tough.... On the other hand, using a nitro-methane engine and a brushless motor as a Generator to drive 4 brushless motors might just be possible..... Not that I have ever considered such a crazy idea.....
  6. I found another IMU on ebay, it's a little cheaper and the ad looked more promising (http://www.ebay.com/itm/-/160887031546?item=160887031546&ViewItem=&ssPageName=ADME:L:OC:US:3160)
  7. Hands Down the HP48 I have had one since college and it saved my ass in thermodymics.... Nothing better than to be able to take those awkward Emperial units and convert them into something sane (ie metric). Inches vs mm has nothing on BTU's vs Watts. And don't even get me started on the really antiquated units like "Tones of Refrigeration", ie the energy needed to melt 1 ton of ice in 24 hours. Really, when was the last time you restocked the ice in your AC unit ? Anyways, I have also become RPN damaged and can barely use a regular calculator for more than one operation. Too bad the keyb
  8. One other thing to look into is using numpy/scipy for number crunching. I have been using that combo both for work and at home for a couple of years now.
  9. Nice demo. One word of advice though: PUSHSTICK... I cringe when I see the table saw sequence in the beginning
  10. If you want a more accurate calibration, just use mother nature: bath to ice-water ~0
  11. hvontres

    PWM + UART

    if you want to run PWM and a UART at the same time, you might want to look at the MSP430G2553 parts. You get a hardware UART and TWO timers to play with. They are currently out of stock, but you can get samples from TI.
  12. Here is a version modified for mspgcc. It uses a slightly different calling convention (args are put into R15:R12 from left to right) I tested this on a MSP430G2231. void binaryToASCIIScale(unsigned int n, unsigned char * digits, unsigned int scale); unsigned char s[5] = {0,0,0,0,0}; int data=1234; int sc=2; void main (void){ binaryToASCIIScale(data, s, sc); } void binaryToASCIIScale(unsigned int n, unsigned char * digits, unsigned int scale) { __asm(" clr R12"); __asm(" rla R15"); __asm(" rla R15"); __asm(" rla
  13. You might want to check out this handy document: http://www.national.com/an/AN/AN-31.pdf I think you want to build a non inverting amplifier.
  14. I think I just had my first Launchpad die after ~6months due to this issue. The regulator and the TUSB chip get hot and the board is no longer recognized as a USB device. The interesting part is VCC is now down to 3.3V from the original 3.6V. It seems that the TUSB chip may have been damaged internaly and is drawing too much current. I wonder how many other lauchpads have suffered this fate. One thing I noticed when reading the Datasheet on the TUSB3210 is that 3.6V is the maximum rated input voltage. I wonder if some parts are getting cooked to death over time. The good news is that right
  15. Here is my solution: I finally managed to find some time to build a box to house an old AT style power supply. I now have +/- 12V, +/- 5V and 3.3V supplies on the front banana plugs. I'll add some labels later. Front View: Back view:
  16. It looks like the uniarch version of mspgcc has headder files for it. Unfortunately, mspdebug doesn't support it yet and I have not had a chance to see if I can get it to work.
  17. It looks like in your initial video you are seeing the power value changing the duty cycle. The fundamental 1Khz rate seems to be steady (rising edge to rising edge). What are you trying to do with the pwm signal? if you run the MSP clock @ 16Mhz you would only get 16 duty cycles for a 1 Mhz update rate.
  18. actually, your Msp is workinkg corrctly. This line: TACCR0 = 1024-1; // PWM Period tells the timer to update the PWM every 1024 Smclk cycles, i.e 1Mhz/1024 Even at the full 16Mhz internal clock you would be very hard pressed to get a 1Mhz PWM cycle.
  19. I'd be interested in two of them for my own use.
  20. FWIW, my order shipped yesterday and should be here Monday.
  21. Just Orderd mine btw, the title of sheet three of the schematic: FR57XX Fraunchpad
  22. A while back I came across this Website: http://koti.mbnet.fi/jahonen/Electronics/DIY%201k%20probe/ It is essentially a 1K resistor attached to a piece of 50 Ohm Coax. The original author did some performance testing on his probes and they are quite impressive for the investment. The original design has a 21:1 attenuation (1050 ohm/50 Ohm) I used two 470 Ohm resistors in Series to get closer to 20:1 (990 Ohm/50 ohm). One drawback of this probe design is that it needs to be terminated into 50 Ohms. My Tds 460A has a built in 50 Ohm termination. If your scope does not, you will also need
  23. You might want to build one of these: http://koti.mbnet.fi/jahonen/Electronics/DIY%201k%20probe/ I can post some comparison shots from my old Tek TDS460A tomorrow. The only tricky part with that kind of probe is that you either need a 50 Ohm terminator or a scope that has an internal 50 Ohm setting (like mine ) Ok, as promised, here are the scope traces for a standard 350Mhz 10:1probe (Channel 2) and a "homebrew" 20:1 probe (channel 4). Both probes were looking at the same pin. The scope used is an old Tek TDS 460A and the Bandwith was limited to 100Mhz. On a 1Mhz clock
  24. You might want to build one of these: http://koti.mbnet.fi/jahonen/Electronics/DIY%201k%20probe/ I can post some comparison shots from my old Tek TDS460A tomorrow. The only tricky part with that kind of probe is that you either need a 50 Ohm terminator or a scope that has an internal 50 Ohm setting (like mine )
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