This board is for prototyping circuits with the Texas Instruments MSP430G2xxx microcontroller. It can be used with the Texas Instruments MSP-EXP430G2 Launchpad and the newer MSP-EXP430G2ET Launchpad. It provides 3.3V/3.6V, +12V, -12V, and +5V. After you develop your project with a Launchpad you can disconnect the Launchpad, remove the MSP430G2xxx from the Launchpad, put it on the prototype board, and run it standalone.

 

The low voltage power supply is adjustable and can be set for voltages between 3.3V and 3.6V. This makes it compatible with both the old Launchpad (MSP-EXP430G2) which operates at 3.6V and the new one (MSP-EXP430G2ET) which operates at 3.3V. The voltage is controlled by trimpot R4.

 

I connected trimpot R4 as a rheostat which is good practice in a circuit like this. The most common failure of potentiometers is the failure of contact between the wiper and the element. It may become erratic (producing noise in an audio circuit like in old radios and TVs) or it may fail completely. If the wiper in R4 fails the circuit resistance will be 100 Ohms and not infinite. In addition I put R4 where it is so that if it has a wiper failure the regulator voltage will go down, not up (it goes down to slightly below 3.3V).

 

The ICL7660CPA is only good for 10-15mA. If you need more than that use an LT1054 and change R6 and R7 to 10 Ohms (or so). The LT1054 is good for 100mA.

 

Use a wire wrap socket for the MSP430G2xxx so you can wire wrap to it, and since the pins of the MSP430G2xxx are connected to the header J1 (except for the clock pins which go to the crystal) they must all be soldered. The MSP430G2xxx is laid out for a 32.768 KHz crystal. For development the J1 header pins are connected to the Launchpad. Once the project is working you can disconnect those wires and plug the programmed MSP430G2xxx into the U3 socket so the project will run standalone.

 

Do not connect the +3.6V on header J1 to the Launchpad. The Launchpad already has power. The reason I put it on the header is to support SPI devices like the BMP-280 temperature/pressure sensor when the proto board is running standalone.

 

The board supports a 16x2 LCD at header J2 with +5V and the contrast control. The data must come from the Launchpad or if you want to run the LCD when the proto board is running standalone you can put a header for the LCD on the proto board and wire the pins to the U3 pins.

 

One of the projects I have used it for was when I wondered what pseudo-random noise from a Linear Feedback Shift Register would sound like when it is run through a stereo faker. A stereo faker treats the mono signal as a L+R signal, then delays it and uses the delayed signal as the L-R signal. It then adds the original and delayed signals to form (L+R)+(L-R) = 2L and subtracts the original and delayed signal to form (L+R)-(L-R) = L+R-L+R = 2R. In the frequency domain this forms two comb filters with the combs alternating between the channels. This confuses the brain because it uses phase/time delay to determine the direction of a sound. When it gets fooled like this it decides that the sound must be coming from everywhere.

 

I programmed the MSP430G2xxx to implement two 31-bit Linear Feedback Shift Registers starting with the same initial seed. Then I clocked only the second one 1250 times. After that I clocked both together. The sequence produced by the first one was therefore always 1250 clocks behind the first one. That is how I produced the delayed pseudo-random noise signal. I recorded the results so you can hear for yourself what pseudo-random noise sounds like with stereo faker. And I am including the code for it.   

 

The complete documentation is at www.jmargolin.com/making/jm_pb2r2.htm .


If you are not already a Maker (and you want to be one) see my tutorial on Making Things at www.jmargolin.com/making/jm_making.htm


Now go out and do something splendid.

 

JM


http://www.jmargolin.com/making/jm_making.htm

Jun 01,2019
111 viewsReport item
  • Comments(1)
  • Likes(1)
You can only upload 1 files in total. Each file cannot exceed 2MB. Supports JPG, JPEG, GIF, PNG, BMP
    View More
    VOTING 10 votes
    • Omer Faruk Ucar from TURKEY
      Founder of the project ‘Lezzetli Robot Tarifleri’ In the frame of this project he produces Turkish contents about electronics/software and serves it to people for free. He produced many jammer devices mostly drone dropper weapons while working in electronic defense industry. He gave lessons to teachers about software and electronics in a program which supported by the government. And now he is working as a hardware engineer on SCADA systems syber security.
      • 3
        design
      • 4
        usability
      • 3
        creativity
      • 4
        content
      3.50
    • Ilya Galkin from RUSSIAN FEDERATION, THE
      Senior hardware engineer
      • 9
        design
      • 10
        usability
      • 6
        creativity
      • 8
        content
      8.25
    • Catia Diaz from MEXICO
      Catia Diaz director of YouTube channel catykanal that was created to insentiate the taste for electronics with tutorials explained in a simple and fun way. Teacher with more than 3 years of experience in promoting the learning of electronics to children and young people.
      • 6
        design
      • 4
        usability
      • 4
        creativity
      • 2
        content
      4.00
    • Jiri Praus from CZECH REPUBLIC, THE
      If you got a low score from me, I don't think you fit for I can solder content. Sorry for that, at least I tried to rate your design. I am an artist. I design electronics and brass wire sculptures. www.jiripraus.cz
      • 5
        design
      • 1
        usability
      • 1
        creativity
      • 1
        content
      2.00
    • Oyvind Dahl from NORWAY
      NOTE: If you have a project that I don't think is for beginners (or I don't understand what it is/lacks documentation) - you'll automatically get a low score from me even though your project is really cool. Sorry! ABOUT: Author of Electronics For Kids. Creator of Ohmify.com and the electronics blog build-electronic-circuits.com.
      • 5
        design
      • 5
        usability
      • 5
        creativity
      • 1
        content
      4.00
    • Ever since I was a kid, I love tinkering with anything that involves energy from toys to cellphones. I love designing and creating projects that could be innovative with the use of electronics. I was also appointed team leader of the University of Sto. Tomas team for the Shell Eco-marathon Philippines Competition in 2018.
      • 7
        design
      • 9
        usability
      • 8
        creativity
      • 7
        content
      7.75
    • LUIS HARO from
      Youtuber & PCB Designer
      • 8
        design
      • 8
        usability
      • 8
        creativity
      • 8
        content
      8.00
    • J_RPM from SPAIN
      My name is José Ramón Pueyo, I live in Spain. For more than 40 years he has worked in the radio communication sector, mainly with RF equipment and developing control and monitoring systems.Five years ago I opened a channel on YouTube (J_RPM) in order to share some developments and divulge technical information.
      • 9
        design
      • 9
        usability
      • 9
        creativity
      • 8
        content
      8.75
    • www.cursoderobotica.com
      • 9
        design
      • 8
        usability
      • 8
        creativity
      • 8
        content
      8.25
    • Fabrizio from MEXICO
      I'm a maker from Mexico, I like to create and share. Check what I'm doing on twiter https://twitter.com/iobrizio
      • 9
        design
      • 10
        usability
      • 10
        creativity
      • 10
        content
      9.75
    View More