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Everything posted by touch

  1. cool project, I've wanted to do something like this for awhile.. will this work with only square wave signals? Some signals I deal with are 15v ptp, what would be the best way of reducing these to the logic level voltages the MSP430 expects?
  2. Here's some code I wrote in a hurry to test out some alarm system modules I got on eBay... If memory serves me right they used some sort of PT2262 encoder (it seemed like a chinese knockoff clone) that generates a 16us sync code pulse and then uses Manchester encoding for the data. The code's pretty sloppy but it worked for what I was testing and I guess I used the "analog style" that jpnorair was talking about. #include <msp430g2553.h> #include <stdio.h> void startTimerA(void){ TAR = 0; TACTL = TASSEL_2 + MC_2; } void stopTimerA(v
  3. I ordered some - hope they'll approve them. I've been using these STM32 Discovery dev boards for awhile and once you get a good tool-chain working, they're excellent development boards with a good set of peripherals, much more than the Stellaris has (DMA!), but they're quite a steep learning code from the simple stuff.
  4. While it's true raising the minimum wage does cause price increases, in the last few years the prices have increased drastically while the amount of money people are making has not. Adjusted for inflation people are making less now than they were in the 70's and yet many companies are having record profits (that go back to the investors) while they raise the price of goods and do not pay their employees anymore.
  5. Strange! Are you soldering the launchpad with any ground/neutral connected to it? I ask because I've seen soldering guns that leak mains A/C onto the tip and if yours was doing this, it would surely blow the LP if the LP is grounded. If you want to test, just put a DMM lead on ground and another on the TIP of your soldering gun and see what you read. Highly unlikely this is the problem but you never know!
  6. Have you tried powering the launchpad by a different computer?
  7. You know half the problem with food-stamps are companies that wont pay a decent wage to their employees and play the law so they work their employees right under the limit to get benefits, for example Walmart employees more people that make just under the poverty level than any other company, so most of their employees can get food-stamps which are probably then spent at Walmart and we the taxpayers end up subsidizing Walmart. But to be honest, I don't see the need to why everyone points at food-stamps as if they are magically what will cure the economy if we take them away. Look at disabi
  8. What about using them with a NRF24L01 + PA/LNA booster pack?
  9. I've had a bit of experience with this, I worked on a project where we wrote and designed a custom storefront/inventory/shipping system. I would certainly look into label printers that can print customs/postage & flat rate envelopes & boxes. You probably already know this but if you plan on doing this software and organization is the key, its also not a bad idea to speak with a accountant/lawyer about opening a LLC or a C-Corp for it, that way you can get a Paypal, bank account, etc in the business name and don't have to use your personal accounts anymore and this simplifies tax relate
  10. Awesome, thanks. Sent you a PM confirming paypal ammount.
  11. I just noticed this - is it too late to get 2M of 60/m strips?
  12. touch

    ASM questions...

    You can find the example ASM code in here for the 2xx3 series MSP430's http://www.ti.com/lit/zip/slac485, ton's of other code examples here: http://www.ti.com/ls...430codeexamples I've been wanting to learn ASM myself, I have modified ASM code a few times and found it very easy to understand the gist of whats going on, much more so than looking at C/C++ code and trying to figure out whats happening. As to your question about grounds, I'm pretty sure as long as the circuit you're testing is not isolated any ground should work, be it the frame, battery or 12 outlet. I'm pretty sure stuff
  13. Got my LED's today. Got any strips left? I got my LED's today and now wish I ordered some strips.
  14. touch


    Whats the channel?
  15. I've seen some cheap power supply's that have no isolation or use half wave rectification, both of which could cause problems. Stay away from the cheap Chinese supply's, they're junk.
  16. You could also use a CPLD or FPGA for controlling the matrix, but the problem is that the source/sink current is limited to something like 25mA per a pin, so you'd still have to use the transistors.
  17. I'd love to be able to see all the forums in one and have one login across all 3 sites, while I am mainly interested in MSP430 stuff, I like to see the projects done on other platforms, as well as questions and answers asked over there, plus things such as General posts, For Sale, etc, are kinda duplicated across all 3 forums because they have a general subject matter. I also have another suggestion about the template, personally I'd much rather see the forums expand the page width to match the browser, rather than match the width of the header. I do believe IPB has a reputation syst
  18. Mine came today too, never seen this flat black finish on a PCB before.. thanks for the source!
  19. I posted an Arduino compatible sketch in the first page of this thread. viewtopic.php?f=8&t=3225&start=10#p23243
  20. Hows the range on the modules? I only get like 25 feet max with these CC2500 modules. I've been trying to find a suitable PA/LNA to boost the signal a few dB. None of the manufacturers of them will send me samples though . I noticed you wanted to make a mailbox monitor.. I've made something similar using one of these: http://www.ebay.com/itm/Wireless-Door-Window-Magnet-Sensor-Detector-For-Alarm-System-433-MHz-/271033425757?pt=LH_DefaultDomain_0&hash=item3f1ad9df5d They use a PT2262 OOK encoder, I just used a receiver like this one http://www.ebay.com/itm/433Mhz-RF-transmitter-and-r
  21. I was considering adding my own LED's for the DP's on things where I needed them. It's easy enough to solder to the chip, just lightly sand the epoxy off of the chip legs, drill a hole where the DP is and stickin a 0402 LED with some enameled wire connecting it to the driver chip. Can you tell if there are any traces in the way of doing this?
  22. Really? that's a good price, is shipping included? Cheapest I've found is on eBay for $1.8 each at qty 5 /w free shipping. I only need 5-6 myself. I'm going to ask someone I've ordered parts from before how much he would charge to get them from Taobao, it looks like 70 cents each in single quantities.
  23. I saw the TLC59213, however I was trying to keep the display either SPI or I2C driven. I think the best solution is like you said digital transistors. I could also use a single chip solution like the HT1632C ($2 in single qtys). A strange thing I noticed is that it does PWM control but also requires current limiting resistors on the LED's.
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