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bluehash

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  1. Like
    bluehash reacted to yyrkoon in msp430G2553 WDT   
    @@bluehash
     
    http://43oh.com/2010/09/msp430-interrupt-primer-watchdog-example/ <---- dead link at the bottom. From 2010 so no big surprise. This link in particular: http://justinstech.org/2010/09/msp430-coding-interrupts-for-mspgcc/
  2. Like
    bluehash reacted to Fmilburn in 4 x 6 cm Projects   
    I have had a package of those 4x6 cm pcb boards with 0.1" spacing for a while and realized this evening that I was about to run out.  They are a good and useful size.  Wondering where they all went I rummaged around and found these and there are more scattered about in various enclosed projects.
     

     
    I am in the habit of soldering one up if it is on the breadboard and I think there is a fair chance I might use it again.  I like to do this even when I am going to have PCBs fabricated.  From top left and going clockwise they are a RFID BoosterPack reader, a Nokia 5110 BoosterPack, an INA125P BoosterPack paired with a strain gauge, a breadboard BoosterPack, a MSP430G2553 Prototyping Board, and a MSP430G2955 Prototyping Board.  The G2955 is a 38 pin TSSOP so it is on an adapter.   The latest one is the Nokia 5110 I put together this afternoon.
     

     
    I had the idea that SMD parts might be directly soldered to these boards.  Here is a 0805 resistor soldered onto a piece of scrap (crooked but OK) with a SOT-223-4 part next to it.  The SOT-223 isn't soldered, I just put it there to show it aligned fairly well.  I ordered an inexpensive selection of 0805 resistors and capacitors and will be using them instead of through hole components to see how they do.
     

     
    Meanwhile, I haven't given up having PCBs fabricated, but this is handy.  What I really need want is a CNC mill.
  3. Like
    bluehash reacted to tripwire in [FIXED!] JTAG interferes with SensorTag external flash access   
    Good news! This issue is fixed in the TI Emulators 6.0.228.0 package, which contains the version 2.3.0.1 firmware for XDS110.
     
    TI have added support for 2-wire cJTAG debugging, which only uses the TMS and TCK lines. In the 2.3.0.1 firmware they also stopped the emulator from driving TDO, which was blocking access to the SPI. It looks like 2-wire cJTAG is the default mode now too, so debugging SPI flash code should just work like you'd expect.
  4. Like
    bluehash reacted to Fmilburn in TI Tuesdays   
    There is a new series of YouTube postings that uses Texas Instruments parts and microcontrollers by Peter Oakes. I have started watching it and have found it interesting. It seems pitched at the hobbyist level (pretty basic at times), but goes beyond just a recipe to make something work and he even pulls out the datasheet!: https://www.youtube.com/playlist?list=PL_atu5RtEPi5I5YWx_wb_j9erZGCvnpvW
     
    EDIT: I have watched a few more of these and apparently they are TI sponsored.
  5. Like
    bluehash reacted to tripwire in SensorTag Altitude Logger   
    Recently I took a trip to the US, which offered a good opportunity to test my altitude logger by recording a profile of the whole journey there. The trace revealed some interesting details about the flights I took, and airline operations in general.

    Here's the profile for the entire trip:
     

     
    The x-axis shows elapsed time in minutes. The altitude is shown in metres, measured relative to the start of the trace (not too far above sea level). Despite that I'll be using feet as the unit of altitude here, since that's the standard used in aviation. Because the logger calculates altitude based on air pressure, it is affected by cabin pressurisation. Instead of recording the true altitude of the aircraft it gives a trace of the effective altitude inside the cabin.

    The first big peak at the blue cursor is a flight from Edinburgh to London Heathrow. Comparing the cabin altitude trace against real altitude data makes it easier to pick out the main features, so here's a chart showing this flight's altitude as broadcast over ADS-B:
     

     
    And this is a closeup showing what my altitude logger recorded for the same flight:
     

     
    The cursors mark where I think the flight started and finished, based on the fact that the plane was in the air for 70 minutes. From takeoff the pressure falls steadily until the effective altitude in the cabin is about 7000ft, at which point the aircraft is actually at 37000ft. After cruising there for 12 minutes the plane descends and cabin pressure steadily increases.

    The cabin pressure reaches ground level before the plane actually lands, so the trace stays flat for the next 12 minutes. In fact, this section of the trace is effectively below ground level while the plane approaches landing. The plane's environmental control system has deliberately overshot and pressurised the cabin to higher than ambient pressure at the destination. At the orange cursor marking the end of the flight you can see a slight increase in altitude. This is when the flight is over and the controller opens the pressurisation valve to equalise with the external air pressure.

    It seems this extra pressurisation is done before takeoff and landing to help the system maintain a steady pressure. There's a detailed explanation of the reasons for this here: http://aviation.stackexchange.com/questions/16796/why-is-cabin-pressure-increased-above-ambient-pressure-on-the-ground

    Now on to the second flight, which was from Heathrow to Dallas Fort Worth. First the ADS-B trace:
     

     
    And the altitude logger's version of events:
     

     
    Again, the cursors mark the start and end of the flight and line up with the reported duration. The "steps" along the top of the trace match up with changes in cruise altitude from 32000?>34000?>36000ft. Maximum effective cabin altitude is about 5500ft, lower than the first flight even when the lower cruise altitude is taken into account. I think that's down to the use of a newer 777 on the international flight compared to the A319 on the domestic route. Modern planes are increasingly designed to offer lower effective cabin altitudes for passenger comfort.

    The stepped flight profile is used to maximise fuel efficiency. Flying higher reduces losses to air resistance, but early in the flight the aircraft is heavy with fuel and climbing is expensive. As the fuel is burned off the optimal cruise altitude increases, so ideally the plane would climb to match. In fact the plane can't climb gradually because modern air traffic control regulations restrict aircraft to set flight levels. The best option under these restrictions is to perform a "step climb" up to a higher level when it's more fuel-efficient than the current one. The flight levels are multiples of 2000ft for flights from the UK to the US, which is why the steps are 32000->34000?>36000ft.

    Wrapping up, one of the things I hoped to test by recording this journey was high rates of altitude change. The altitude logger can currently handle rates of change up to
  6. Like
    bluehash got a reaction from pine in SimpleLink Wi-Fi SensorTag Due For Early 2016 Release   
    Video:
     

  7. Like
    bluehash reacted to tripwire in Casio watch rebuild w/ MSP430   
    It looks like the author also made a tool to use EnergyTrace without needing to install CCS, might be worth a look:
     
    https://github.com/carrotIndustries/energytrace-util
  8. Like
    bluehash reacted to chicken in Casio watch rebuild w/ MSP430   
    Today Hackaday featured someone that replaced the innards of a Casio watch with an MSP430FR6972
    http://hackaday.com/2016/05/30/gutting-and-rebuilding-a-classic-watch/

     
    Very well documented on GitHub, including more pictures:
    https://github.com/carrotIndustries/pluto
     
    If the author is on 43oh:
  9. Like
    bluehash got a reaction from yyrkoon in Digital Ocean?   
    @@zeke, I use linode.
    They have been good support and uptime wise.
    The crashes you see on 43oh is not because of Linode, but mysql not tuned well. I recommend them.
  10. Like
    bluehash got a reaction from pine in TI Store Happy Geek Pride Day! Celebrate with discounted shipping.   
    Shipping within the United States FedEx Ground=$1.00 0000 0001 FedEx Saver (3-day delivery)=$2.00 0000 0010 FedEx Express Economy (2-day delivery)=$4.00 0000 0100 FedEx Overnight PM Delivery=$8.00 0000 1000 FedEx Overnight AM Delivery=$16.00 0001 0000 Shipping outside the United States International Economy=$4.00 0000 0100 International Priority=$16.00 0001 0000     Shop TI store now   Enjoy our shipping discounts!
  11. Like
    bluehash got a reaction from dubnet in TI Store Happy Geek Pride Day! Celebrate with discounted shipping.   
    Shipping within the United States FedEx Ground=$1.00 0000 0001 FedEx Saver (3-day delivery)=$2.00 0000 0010 FedEx Express Economy (2-day delivery)=$4.00 0000 0100 FedEx Overnight PM Delivery=$8.00 0000 1000 FedEx Overnight AM Delivery=$16.00 0001 0000 Shipping outside the United States International Economy=$4.00 0000 0100 International Priority=$16.00 0001 0000     Shop TI store now   Enjoy our shipping discounts!
  12. Like
    bluehash got a reaction from spirilis in TI Store Happy Geek Pride Day! Celebrate with discounted shipping.   
    Shipping within the United States FedEx Ground=$1.00 0000 0001 FedEx Saver (3-day delivery)=$2.00 0000 0010 FedEx Express Economy (2-day delivery)=$4.00 0000 0100 FedEx Overnight PM Delivery=$8.00 0000 1000 FedEx Overnight AM Delivery=$16.00 0001 0000 Shipping outside the United States International Economy=$4.00 0000 0100 International Priority=$16.00 0001 0000     Shop TI store now   Enjoy our shipping discounts!
  13. Like
    bluehash got a reaction from cubeberg in TI Store Happy Geek Pride Day! Celebrate with discounted shipping.   
    Shipping within the United States FedEx Ground=$1.00 0000 0001 FedEx Saver (3-day delivery)=$2.00 0000 0010 FedEx Express Economy (2-day delivery)=$4.00 0000 0100 FedEx Overnight PM Delivery=$8.00 0000 1000 FedEx Overnight AM Delivery=$16.00 0001 0000 Shipping outside the United States International Economy=$4.00 0000 0100 International Priority=$16.00 0001 0000     Shop TI store now   Enjoy our shipping discounts!
  14. Like
    bluehash reacted to grodius in TI OPT8241 Time of flight QVGA 3D sensor   
    This is a quite exciting new sensor. The development kit is prohibitively expensive and the chip driver is 256BGA, but at around $50 for the raw sensor capable of 150 fps of 320x240 with distance, this is cool.
     
    Time of flight pulses out light/IR and counts the sub nanoseconds it takes to bounce back.
     
    The specs are pretty impressive for an early model.
     
    http://www.ti.com/product/OPT8241
     
    Ideally I would prefer the device and driver chip were paired on a board, but hopefully these will be popular and warrant more integrated solutions.
  15. Like
    bluehash reacted to chicken in Products using MSP430   
    Philips Hue Tap, a wireless light switch without battery, featuring a MSP430FR5730

     
    Teardown by Adafruit, with the MSP430 discovered at the 15 minute mark.
    https://youtu.be/4T4nhuobjZM?t=875
     
    This device doesn't have a battery, but uses a mechanical, relais-like component to generate power when the user pushes buttons.
    https://www.enocean.com/en/enocean_modules/eco-200/

  16. Like
    bluehash reacted to pine in Arrow free shipping on US order >$50, and Intl order >$299, till May 27th   
    https://www.arrow.com/en/research-and-events/articles/free-shipping-for-makers
     
    "Free domestic ground shipping on purchases of $50.00 or more using promo code MAKEWITHARROW. Free international shipping on purchases of $299.00 or more using promo code MAKEWITHARROWINT. Offer valid until May 27th, 2016. Offer is not valid in combination with any other promotion or offer. Offer is not valid on purchases made through a MyArrow account."
  17. Like
    bluehash reacted to terjeio in PCB Laser Exposer/Printer   
    Here are the files for my PCB Exposer/Printer, it is the complete package including mechanical design files.
     

    The printer itself.
     

    Example - a power control PCB for Raspberry Pi - 40 x 40 mm.
     
    Code includes driver for MCP4725 DAC, buffered serial port driver, stepper motor control and command parsing for the MSP430G2553 used as the main controller.
     
    Code and design files:
     
    PCB Exposer - controller code for MSP430G2553.zip
    PCB Exposer - desktop application.zip
    PCB Exposer - mechanical design files in Vectric format.zip
    PCB Exposer - schematics and PCBs.zip
     
    Desktop application is coded in C#, schematics and PCBs in KiCad format.
     
    There is some more information to be found in this tread:
    http://forum.43oh.com/topic/4990-what-are-you-doing-right-now/page-5
     
    Terje
     
     
  18. Like
    bluehash reacted to RobG in Howto send break signal on UART?   
    This is pretty much the way I am doing it in my code (non Energia.) 
    Change pin function from UART to I/O, set pin to low, wait, set pin high, change pin function back to UART, send data
    Not sure why you have problem with the start bit.
  19. Like
    bluehash reacted to dubnet in Nice form factor for low power wireless node   
    Saw this on DP and checked out the author's blog. Neat way of producing a inexpensive, small form factor wireless data acquisition node. Two AA cells and the board all in a cheap three cell AA enclosure. Would be cool to see this adapted to a TI MCU.
     
    http://johan.kanflo.com/the-aaduino/
  20. Like
    bluehash reacted to phenyl in One Wire Controller booster   
    Hi Zeke,
     
    I was using http://www.pcbway.com/ at work and for a private project or two. At work we paid for fast shipping on some small simple boards that we needed quickly, the boards got here in less than a work week and looked good (and performed well). Otherwise you can check on http://www.pcbshopper.com/, they run comparisons on your size and time-requirements to help you find the optimal boardhouse.
     
    (I am unaffiliated with either company, only a customer and I used pcbshoppers website).
  21. Like
    bluehash reacted to Lgbeno in T-962 Reflow Oven   
    After a few years with the toaster ovens, I recently upgraded to this T-962 Reflow oven that I picked up on eBay for $184.
     
    Not sure why I waited so long, I baked my first 3 boards printed with stencils from OSH Stencil and they turned out great. Highly recommended!
     
     

  22. Like
    bluehash reacted to Rickta59 in Flow Chart Template   
    We are all dating ourselves by responding to this post : )...
     
    This is the one I remember:

     
    I also have a metal ruler that was used for laying out formats for an IBM line printer.
     
    -rick
  23. Like
    bluehash reacted to Fmilburn in Flow Chart Template   
    I have been working on a project lately where I need to fit a design into an enclosure and was fumbling through my drawer looking for a measuring scale when I came across an old flow charting template.  I acquired it almost 40 years ago when I was working on a hydrocarbon process simulator that we were programing in FORTRAN.  That project was the last time I wrote code until fairly recently, but anyway, here is the template:

    Pretty funny...  On the left side is a "card scale" that you could put next to a stack of IBM punched cards to estimate how many you had.  Over at top right are the main ways of getting something into the computer - punched card, magnetic tape, and punched tape.  I actually remember using punched paper tape on a computer once.  Down below is online storage, offline storage, and "drum".  Followed by document, display, terminal, and manual operation.
     
    I don't actually remember using it as we weren't required to document with flow charts.  But we did have extensive user documentation in the form of paper manuals and the code itself was heavily documented.
     
     
     
  24. Like
    bluehash reacted to RobG in Need a buck switching power supply design   
    How about LM2576? They are super simple and dirt cheap (~$1.25 for all parts,) used them in few projects.
    They are only 3A, but you could split your supply rail and use two of them.
     

  25. Like
    bluehash reacted to USWaterRockets in Need a buck switching power supply design   
    I've had good luck with the TI Nanomodules. I've used the LMZ21700 in a project to get 5V @ 650mA from a 4S LiPo battery.  I've been working on another design using the TPS81256.
     
    I know these parts don't meet your exact requirements, but I'm just pointing out that I've been happy with the experience I have had with the TI nanomodules I've used so far. Take it for what that's worth.
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