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Showing content with the highest reputation since 10/11/2012 in all areas

  1. 8 points
    Thanks @Rei Vilo. To all, the award goes to you too. Thanks for being wonderful members.
  2. 7 points
    greeeg

    GPS logger for a local Beagle club

    This project was put on hold over the holidays. It's always a busy time, plus the club doesn't hold meets over summer. But I have just completed another 10 units. More of the same, but thought you guys might enjoy some more photos. I couldn't get the same batteries as the last batch, which were 650mAh, these have much smaller 220mAh. But this still provides about 4 hours of run time. The uBlox GPS modules are a huge improvement. Even without the SAW filter in the RF path and the sub-optimal PCB size compared to the antenna. These find more GPS satellites faster than the G.top modules, plus they also use glonass which doubles the visible satellites.
  3. 7 points
    Well deserved, congratulations Gerard!
  4. 5 points
    terjeio

    RFC: CNC BoosterPack

    Driver code for a few boards is available from my github account. A PCB design with reduced size allows two boards to be mounted to the EK-TM4C1294XL LaunchPad providing up to 6 axes of control (needs to be verified). I have also added TCP streaming to the EK-TM4C1294XL LaunchPad but usure if I can publish the code due to the "viral" clause in many of TIs files - even the startup code 🙁. Grbl is released under GPL and I have a hard time understanding the legalese related to that... I am currently working on a DRO/MPG for my lathe with Grbl running on a MSP432, and the DRO/MPG code on a Tiva C/MSP430 combo. Threading support is a part of that work and hopefully I'll be able to get it working reliably - looks promising this far.
  5. 5 points
    Rei Vilo

    I²C Check-List

    Check the usual suspects: Is the I²C bus initialised? Wire.begin(); Does the I²C device run at 3.3V? Otherwise, use a logic-level converter. Are pull-ups installed? Try 10, 4.7 or 2.2 kΩ for the SDA and SCL lines. In case the LaunchPad provides multiple I²C ports, is the correct port selected? Try Wire.setModule(0); // or other port number Wire.begin(); Still nothing? Use a logic analyser to trace the signals on the I²C port. (To be continued...)
  6. 5 points
    Rei Vilo

    J-Link EDU Mini at USD18

    Although all the LaunchPads feature a programmer-debugger, sometimes an external one might be useful. Segger has just launched the J-Link EDU Mini, with all the software and expertise of Segger, priced at just USD18! I'm very happy with the larger Segger J-Link Edu priced at USD60. I've ordered one J-Link EDU Mini and plan to review it.
  7. 5 points
    The example msp430fr5994x_lpm4-5_02.c is supposed to show how little current is used in this mode. In the file it says: // MSP430FR5x9x Demo - Entering and waking up from LPM4.5 via P1.3 interrupt // with SVS disabled // // Description: Download and run the program. When entered LPM4.5, no LEDs // should be on. Use a multimeter to measure current on JP1 and // compare to the datasheet. When a positive voltage is applied // to P1.3 the device should wake up from LPM4.5. This will enable // the LFXT oscillator and blink the LED (on P1.0). Even for a high-end multimeter this current is too low to be accurately measured. So I helped myself this way: - power the processor from the supercap - a 10k resistor with two antiparallel diodes act as a shunt, - connect the volt meter across the supercap, not across the processor 0.43mV over a 10k resistor gives 43 Nanoamps. (!) Yes, the datasheet (page 32) is right, typical value at 25°C is 45nA. A CR2032 (200mAh) cell would allow the processor to wait for an interrupt for 530 years.
  8. 5 points
    My compact Lisp interpreter, uLisp, now supports the MSP430F5529 and MSP430FR5969 LaunchPads. As well as supporting a core set of Lisp functions, uLisp includes Arduino/Energia extensions, making it ideal as a control language for the MSP430. For more information see http://www.ulisp.com/.
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