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DavidEQ

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DavidEQ last won the day on July 15 2011

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About DavidEQ

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  1. Ok time for me to throw out 4 names cause I am bored. Armipedia Armed and prototyped It came from Planet Arm Armagetdone (pronounced lt like Armageddon) Hope someone does a site, I would drop by a lot. The Maple forums are constantly fighting spam, they clean it every day and its not really a problem for a user like me but you can tell it takes a lot of work. I never see much spam posts about cleaning it here so a big thumbs up for whatever your doing.
  2. Re: who has the STM32F0Discovery for $7.99 http://www.mouser.com/ProductDetail/STM ... Zefg%3d%3d Mouser for one.
  3. Epic cut paste fail Apple/Mac you can build your own GCC using info here: https://github.com/MikeSmith/gcc-arm-em ... osx#readme
  4. I never really found one for STM32 up to the level 43oh is for the 430. The best I found is here http://www.emcu.it/STM32.html Its in Italy but the page is in english. Lots of good info there. There is a $7.99 STM32F0 Discovery out now, but I am sticking with the F4 version. The big problem is free development tools. A must for me. Apple/Mac you can build your own GCC using info here posting.php?mode=reply&f=31&t=1456 PC you can use prebuilt ones available from the ARM people here https://launchpad.net/gcc-arm-embedded The mac scripts build from the source fil
  5. I've been playing with the STM32F4Discovery board and man its fast. I wrote a loop to see how fast it could compute the sin function on the fly so I could do it without a look up table. I used the sinf() in math.h. I found the sine (32 bit float not double) of 10 values between -3.0 and plus 3.0 (sinf() takes inputs from -pi to +pi if you haven't used it) and looped that to see if I could do 44.1khz sampling. It turns out it can do 10 sinf() but some other delays so I can see the signal on my slow scope at over 141 kHz when clocked at 168 mhz and using the FPU. . Combine that with the on b
  6. I just got handed my free sample. Cool! I never did get a it shipped email.
  7. I would be interested in what you end up doing with yours. It has a 24 bit audio dac and head phone amp on the board. I bet you come up with something neat. I ordered two then hit them up for a free sample and got approved too. I guess I will end up with 3 later this month. Still considering what project to put it to use.
  8. Very briefly at CooCox and just didn't get what it was trying to be. You use it?
  9. $14.90 each from Mouser, I have two on backorder (about two weeks till they they ship). Its not breadboard friendly as there are two double rows of pins to bring out 100 pins.
  10. What oPossum said.... He knows his stuff! He helped me with pwm sine waves too. I'm suprised its such a popular topic.
  11. I'm going to start with a 47 ohm to 5v (47 ma) and parallel them until I hit 5 of them or it looks readable/good enough. Left them at work, rats.
  12. Im just learning the 430 too. If you google " AVR146: Lithium-Ion Battery Charging via USB with ATmega16/32U4" can find a pdf Atmel has up for charging batteries. The code won't work but the flow charts and description of how it works should give you some ideas. I think you will end up using a pwm output to control the charge current and 2 a/d channels to read the charge current and voltage across the battery. Tempurature would be a 3rd channel on the a/d I guess. Trickle charge the battery slowly for a while so you can then guess the number of cells from the voltage after you know they
  13. I have a 20x4 line version of that display and while its possible to run the backlight from 3.3 the dropping resistor is pretty small. For the above you need 15 milliamps for the backlight when its at 3 volts. If your running 3.3v for the micro your resistor would be ohms (3.3v -3.0v)/0.015 amps. I personally don't feel comfit-able with that small of a dropping resistor, if your power supply should creep to 3.6 volts you would dump double the current into the display. Anyone have luck running the 3v backlight displays off 3.3? I never actually tried it, I didn't feel safe doing it
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