Posts Tagged ‘raspberry pi’

NERP Tonight: Big Blinkies

Tonight at NERP, Yours Truly will show a couple of ways to interface from low level logic to 120VAC to control lights, motors, etc.

It’s well understood that small microprocessors have very little power available on their output pins. A load controlled by the processor can be AC or DC, and low or high voltage. The interface circuit has to amplify the logic level signal to the appropriate power for the load.  An unusual method (Ok, it’s a hack) for controlling 120VAC light dimmers involves adding a photocell to a commercial wall dimmer, and coupling the photocell to the processor via a PWM’ed LED. (This method of interfacing involves working with dangerous voltages and currents. It is presented for demonstration purposes, only. Don’t try this at home. Or do. It’s your choice.) A simpler method of interfacing to 120VAC uses solid state relays for on-off control. We’ll see SSR’s  used for making a big blinky for large lamps.

NERP is not exclusively raspberry pi, the small computer interest group at Pumping Station:One in Chicago.

Find NERP and Pumping Station:One
at http://www.meetup.com/NERP-Not-Exclusively-Raspberry-Pi/
and http://pumpingstationone.org/

NERP meets every other Monday at 7pm at Pumping Station:One, 3519 N. Elston Ave. in Chicago.
Doors open at 6:30pm. The next meeting is Nov. 18, 2013 NERP is free and open to the public.
Ed Bennett ed @ kinetics and electronics com
Tags: electronics, embedded, NERP, Open Source, raspberry pi, hackerspace, Beagle Bone, Element14

18

11 2013

NERP Tonight: Ste on the Launchpad

Tonight at NERP, Ste Kulov will introduce the MSP430 line of microcontrollers from Texas Instruments. His talk will focus on using the MSP-EXP430G2 Launchpad kit.

The MSP product line from Texas Instruments contains an extensive variety of microcontrollers varying in size, peripherals, etc. MSP microcontrollers are know for being 16-bit, very low power, feature-rich, and low-priced. The development boards are called Launchpads. Open source software for developing on Launchpads has been scarce and not condoned by TI. This is changing however as TI has joined the msp-gcc project in collaboration with Redhat. One outcome to date is the energia development tools, which are a fork of the Arduino tools.

http://energia.nu/Guide_MSP430LaunchPad.html (see the pix of Launchpads)

Here’s what Ste says he’s likely to cover. (It’s a lot, so we may run a little over time).

1.) Talk about the MSP-EXP430G2 Launchpad kit and what comes with it.

2.) Very brief overview of Energia, which is software that turns your Launchpad into an Arduino.

3.) Introduce Code Composer Studio, which is the official software used for most Texas Instruments software development.

4.) Basic Boolean algebra review.

5.) Go over simple tasks such as setting, clearing, and toggling bits.

6.) Run a simple “Hello World” LED blink program.

7.) Run through the project I had to create for my job.  It uses Timers, Interrupts, and the Low Power modes.

NERP is not exclusively raspberry pi, the small computer interest group at Pumping Station:One in Chicago.

Find NERP and Pumping Station:One
at http://www.meetup.com/NERP-Not-Exclusively-Raspberry-Pi/
and http://pumpingstationone.org/

NERP meets at 7pm Nov. 4, 2013 at Pumping Station:One, 3519 N. Elston Ave. in Chicago.
Doors open at 6:30pm. NERP is free and open to the public.
Ed Bennett ed @ kinetics and electronics com
Tags: electronics, embedded, NERP, Open Source, raspberry pi, hackerspace, Beagle Bone, Element14

04

11 2013

NERP: Implementing MIL-STD-1553 with 3 Beagles

Tonight Trefor Delve will present a distributed simulation development making use of three Beagle Bone Blacks as part of the network. The simulation is used as a proof of concept for a general purpose, configurable simulation platform making using of public domain software.

Mil1553_timingMIL Standard 1553 bus timing [wikipedia]

The presentation will introduce the principles of the MIL Standard 1553 data bus, show a simulation with simulated hardware and demonstrate the same software running on distributed Beagle computers making use of the Beagle’s ADC, PWM and SPI interfaces.

The presentation will also demonstrate the use of the QT widget set to allow remote virtual hardware to interact with the Beagle simulation.

The presentation will demonstrate the setup of the ADC, PWM and SPI interfaces using the system capabilities.

NERP is not exclusively raspberry pi, the small computer interest group at Pumping Station:One in Chicago.

Find NERP and Pumping Station:One
at http://www.meetup.com/NERP-Not-Exclusively-Raspberry-Pi/
and http://pumpingstationone.org/

NERP meets at 7pm Oct., 7, 201313 at Pumping Station:One, 3519 N. Elston Ave. in Chicago.
Doors open at 6:30pm. NERP is free and open to the public.
Ed Bennett ed @ kinetics and electronics com
Tags: electronics, embedded, NERP, Open Source, raspberry pi, hackerspace, Beagle Bone, Element14

07

10 2013

NERP tonight — 5400 seconds of Fame!

It’s Open Mic Night at NERP! Bring your comments, suggestions, questions, works in progress, etc. to NERP (not exclusively Raspberry Pi), the small and embedded computer interest group at Pumping Station:One. Tell us what you’re working on, show a demo, or get feedback, or maybe even ideas!

Find NERP and Pumping Station:One
at http://www.meetup.com/NERP-Not-Exclusively-Raspberry-Pi/
and http://pumpingstationone.org/

NERP meets at 7pm 9-23-13 at Pumping Station:One, 3519 N. Elston Ave. in Chicago.

Doors open at 6:30pm. NERP is free and open to the public.
Ed Bennett ed @ kinetics and electronics com

Tags: electronics, embedded, NERP, Open Source, raspberry pi, hackerspace, Beagle Bone, Element14

 

23

09 2013

NERP Tonight: QT and Steppers

NERP Tonight: QT and Steppers

 

Tonight at NERP, we’ll have a show and tell about the PS:1 entry in the Element14 hackerspace challenge.(http://www.element14.com/community/community/knode/single-board_computers/next-gen_beaglebone/blog/2013/06/12/beaglebone-black–the-2013-hackerspace-challenge/)We’ll highlight use of the QT framework and gui tools on the Beagle Bone Black to run the stepper motors on the pick and place machine. There are always challenges in getting a new platform up. One challenge has been resolving version problems with the QT3 to QT4 transition on ARM. We’ll find out how that’s going. Also we’ll also have a tour of the system’s Z- and θ- axes mechanism and find out what the test results were on using some very small stepper motors to drive the head. As a bit of improvisational comedy, some of the tests will be done live during NERP! Yow!

NERP is not exclusively raspberry pi, the small computer interest group at Pumping Station:One in Chicago.

 

Find NERP and Pumping Station:One
at http://www.meetup.com/NERP-Not-Exclusively-Raspberry-Pi/
and http://pumpingstationone.org/

NERP meets at 7pm 7-15-13 at Pumping Station:One, 3519 N. Elston Ave. in Chicago.
Doors open at 6:30pm. NERP is free and open to the public.
Ed Bennett ed @ kinetics and electronics com

 

Tags: electronics, embedded, NERP, Open Source, raspberry pi, hackerspace, Beagle Bone, Element14

 

 

15

07 2013

NERP: Retro DOS Gaming on the Raspberry Pi, and a Hackerspace Challenge Update

Tonight at NERP,  Jay Hopkins will show us some how to set up an MSDOS emulator and use it to run 8-bit games. Bleep.

Ed will talk about the status of PS:1′s project for the Element14 Hackerspace challenge. While amusing, entertaining, and informative, the update will also be a pitch for anyone who is interested in the technologies to help PS:1 compete for the big prize.

NERP is not exclusively raspberry pi, the small computer interest group at Pumping Station:One in Chicago.
Find NERP and Pumping Station:One
at http://www.meetup.com/NERP-Not-Exclusively-Raspberry-Pi/
and http://pumpingstationone.org/

NERP meets at 7pm 7-1-13 at Pumping Station:One, 3519 N. Elston Ave. in Chicago.
Doors open at 6:30pm. NERP is free and open to the public.
Ed Bennett ed @ kinetics and electronics com

01

07 2013

Raspberry Pi Video Camera, BoneScript on the Beagle

Raspberry Pi Video Camera, BoneScript on the Beagle
NERP is not exclusively raspberry pi, the small computer interest group atPumping Station:One in Chicago.

We’ve been wondering what it’s like to work with the new Raspberry Pi camera module. Tonight we’re in luck. Craig LeMoyne has a Raspberry Pi project he’ll show us tonight. In his words:

“I have an RPi Model A in my basement running Apache2 and taking pictures
using the new Camera Module every few seconds of a wet area that I *hopefully* managed to patch. It is good fun, and I can also do timelapse video from the pictures. The Pi will even compile the timelapse for me!”

Drew Fustini will introduce us to programming the Beagle Bone Black in BoneScript.
I’ve been saying for years that Javascript would be the next hot language for microcontrollers – maybe it’s true. From beagleboard.org/Support/BoneScript

“BoneScript is a node.js-based language specifically optimized for the Beagle family and featuring familiar Arduino function calls, exported to the browser. Get started exploring the BoneScript Library to discover the great simplicity that is made possible by utilizing Linux in BoneScript.”

Find NERP and Pumping Station:One
at http://www.meetup.com…
and http://pumpingstation…

NERP meets at 7pm 6-3-13 at Pumping Station:One, 3519 N. Elston Ave. in Chicago.
Doors open at 6:30pm. NERP is free and open to the public.
Ed Bennett ed @ kinetics and electronics . com

03

06 2013

NERP tonight: Beagles and Barbells

NERP is not exclusively raspberry pi, the small computer interest group at
Pumping Station:One in Chicago.

Two Pumping Station:One members, Jarrod Wolf and Gabe Priyev, are co-founders of SpotMe (spotmefit.com), a startup which aims to “Bring Gyms and Health Clubs into the Digital Age”. Spotme’s patented technology

“… makes fitness easy. SpotMe provides workout plans that are tailored to an individual’s goals and that adapt to a user’s biometrics. Our system is seamless; it does not require user input to function. SpotMe service is offered through a subscription that is bundled with gym memberships. When a member shows up at the gym, they are provided with a personalized workout (accessible via app or print out). All a user has to do is put on a wristband and ankleband. It’s that easy.”

Tonight Gabe will describe how the sensing parts work, and the role of small wireless hardware devices that move data between different parts of the system.

Dem Bones

The Beagle Bone embedded computer is in the spotlight again tonight. Drew Fustini will share some of the BB-related insights he gathered a couple of weeks ago at Design West. This will be the first in a series of talks Drew will give on “official” guidance for new users as offered by the Beagle Bone developers and project evangelists. Good stuff.

Find NERP and Pumping Station:One
at http://www.meetup.com/NERP-Not-Exclusively-Raspberry-Pi/
and http://pumpingstationone.org

NERP meets at 7pm 5-6-13 at Pumping Station:One, 3519 N. Elston Ave. in
Chicago. Doors open at 6:30pm. NERP is free and open to the public.

Ed Bennett ed @ kinetics and electronics . com

06

05 2013

NERP tonight: The revolution is over! Let the battles begin!

NERP is not exclusively raspberry pi, the small computer interest group at
Pumping Station:One in Chicago.

There are a bunch of credit card size and smaller computers out there, but the
one closest to the Raspberry Pi in purpose and features is the Beagle Bone. The
BeagleBone is a credit-card sized Linux computer that connects with the Internet
and runs software such as Android 4.0 and Ubuntu. NERP first saw the Beagle
Board during Drew’s high-level overview in March.

beagle-hd-logo

The current Beagle Bone (~$89) costs more than the Raspberry Pi, but the Bone
has better perfomance. Tomorrow, 4/23/13, circutco.com will publicly announce a
new, more powerful, more featureful, and cheaper Beagle Bone. The price for the
new board will put it closer to the Pi. The revolution is over, but the
competiton for the smallest, most powerful, most versatile, and cheapest
embeddable computer has just begun. Adafruit, one of several Beagle Bone
resellers, is getting revved up for the new release.

http://www.adafruit.com/products/1278

Tonight Brian Chamberlain will give an in depth introduction to writing code on
the Beagle Bone. Brian’s talk will  “…cover how to setup and run remote
debugging on a BeagleBone from within the Eclipse IDE. It will include a
walkthrough of the key steps for setting things up. Then a demonstration of how
to step through lines of code, inspect variables, and generally cause havoc on a
simple program running remotely on the BeagleBone. Also, as a segway from our
normal RaspberryPi discussions there will be a brief overview of the BeagleBone,
its features, and how it compares to the RaspberryPi.”

Find NERP and Pumping Station:One
at http://www.meetup.com/NERP-Not-Exclusively-Raspberry-Pi/
and http://pumpingstationone.org

NERP meets at 7pm 4-22-13 at Pumping Station:One, 3519 N. Elston Ave. in
Chicago. NERP is free and open to the public.

Ed Bennett ed @ kinetics and electronics . com

22

04 2013

NERP – FPGAOK

FPGA1

FPGA2

I’ve heard a lot of positive feedback from the NERP FPGA workshop we did a couple weeks back.  There were a few people who asked me to post the Verilog code that went along with the two demos we did.  I added comments to the Verilog files in an attempt to clear up a lot of the stuff we cruised through to avoid turning this purely into a Verilog class.  The most useful comments will be in the VGA controller module we wrote: vga640x480.v.  Anyway, all the required project files to synthesize the logic we wrote are right here:  NERP_demo.zip

The software we used to build everything is the Xilinx ISE WebPACK 13.4.  You have to register with Xilinx and generate/download a license on their website to use the software.  Just remember that the above project will only work on the Digilent Nexys2-1200 board that I was using.

If you’re interested in grabbing a budget board for messing around with FPGAs or CPLDs, there are a few notable options:

  1. Papilio One
  2. CoolRunner-II
  3. DE0-Nano
  4. Basys2
  5. XuLA-200
  6. BORA

Also, thanks to Drew Fustini for the lovely photos you ‘re seeing above.  Actually, this whole FPGA thing was Drew’s idea.  So, if you were really itching to do some Raspberry Pi that week and walked in to find a bunch of nerds talking about programmable logic gates, then all your blame should be focused towards him.  On the other hand, if you enjoyed this FPGA crash-course you should thank him for that and any subsequent class/workshop he forces me to do.

MORE PHOTOS HERE

12

04 2013