Pololu Blog (Page 10)

Welcome to the Pololu Blog, where we provide updates about what we and our customers are doing and thinking about. This blog used to be Pololu president Jan Malášek’s Engage Your Brain blog; you can view just those posts here.

R2-DR, Kevin's dead reckoning robot

Posted by Kevin on 26 March 2014
Tags: lvbots
R2-DR, Kevin's dead reckoning robot

When I first started planning a robot for the recent LVBots dead reckoning competition, it was more or less a conventional design—a flat chassis with motors and circuit boards attached to the top and bottom—and I lost interest in it quickly because it felt like I was just reinventing the 3pi. I looked for a way to make the shape of the robot unique, and I noticed that the three-legged shape of R2-D2, the famous astromech droid from Star Wars, might be a good fit for a typical undercarriage composed of a ball caster and two wheels. The result of continuing along this line of investigation is my dead reckoning robot, R2-DR (you can probably guess what DR stands for). Continued…

Brandon's dead reckoning robot

Posted by Brandon on 25 March 2014
Tags: lvbots
Brandon's dead reckoning robot

For the recent LVBots dead reckoning competition that was hosted here at Pololu, I decided to make a robot based on the Baby Orangutan robot controller. This post details my robot and some of the considerations made while I went through my design process. If you would like more details about the competition rules and how it was judged, see the LVBots dead reckoning rules (23k pdf).

I started by choosing my parts and making sure that my robot, which would later be named “Baby Blues”, would be able to function in the way I wanted. I decided on using the Baby Orangutan because of its integrated motor driver and compact size. Continued…

New products: 500mA Step-Down Voltage Regulator D24V5Fx

Posted by Claire on 24 March 2014


New products: 500mA Step-Down Voltage Regulator D24V5Fx

We are happy to introduce our D24V5Fx voltage regulator family, a next-generation version of our tiny D24V3Fx and D24V6Fx buck (step-down) regulators, which have been some of our most popular products. These new regulators are synchronous, which results in better efficiency, especially at light loads, and they have much lower dropout voltages (e.g. the 5 V version has just over 1 mV of dropout per mA of output current).

So far we have versions with 3.3 V, 5 V, 9 V, and 12 V outputs, and we will soon be releasing 1.8 V, 2.5 V, and 6 V versions; you can contact us for custom voltages, too. They operate with input voltages up to 36 V and have typical efficiencies of 80% to 93%. These regulators have integrated over-temperature and over-current shutoff, and they reduce their switching frequency from the typical 500 kHz to improve efficiency at light loads, making them well suited for low-power applications that are run from a battery.

At only 0.5″ × 0.4″ × 0.1″ (13 mm × 10 mm × 3 mm) these buck regulators are also smaller than standard through hole linear regulators with DIP packages. The picture below shows a D24V5Fx next to a 7805 voltage regulator in a TO-220 package.

For other regulator options, you can take a look at our full selection of step-up voltage regulators, step-down voltage regulators, and step-up/step-down voltage regulators.

New revision of the Dual VNH5019 motor driver shield for Arduino

Posted by Kevin on 24 March 2014
Tags: new products
New revision of the Dual VNH5019 motor driver shield for Arduino

We’ve released an updated version of our dual VNH5019 motor driver shield for Arduino. The VNH5019 is a great solution for driving high-power motors, with each chip able to supply up to 12 A continuously at 5.5 V to 24 V. However, the original version of our dual VNH5019 shield was designed before the Arduino Uno R3 was released, so it lacked pass-throughs for the four new pins (SCL, SDA, IOREF, and an unused pin) introduced by the R3 and present on all newer Arduinos. This makes it harder to stack other shields with it, especially ones that make use of the new I²C pin location. The latest board revision adds these pass-throughs to make the shield fully compatible with the Uno R3 pinout.

For more information, see the dual VNH5019 motor driver shield product page and user’s guide.

Higher-resolution pictures on the Pololu website

Posted by Paul on 21 March 2014


This week we made higher-resolution pictures available throughout the Pololu website. When we overhauled our website back in 2007, 1080p displays were almost unheard of, and we decided to show our pictures at a maximum width of 600 pixels so that they would fit on everyone’s screen. Now, about a quarter of our web visitors have displays that are 1080p or better, and 600 pixels is looking disappointingly small.

It turns out that even though we were not displaying them, we already had many high-resolution pictures in our database. So, just changing the code allows some old pages to get a lot better! For example, this picture of our QTR-8A Reflectance Sensor Array was originally uploaded as a 1000-pixel-wide image – now you can zoom in and try to read the resistor values:

Screenshots were particularly disappointing before, since they are naturally high-resolution. Here is an example, an oscilloscope trace of some LC Voltage Spikes. Click the picture for the full, 1024-pixel-wide image. Note: the image gets resized to fit in the popup window, so you might have to click one more time to zoom in all the way.

We will be gradually adding new higher-resolution pictures, but are there any that you would like us to redo as soon as possible? Any additional views, like the bottom of a board, that you think we are missing? Please post a comment to let us know.

Power Level Indicator for Ghostbusters Proton Gun

Posted by Arthur on 19 March 2014

Justin Chase Black (Throwing Chicken) is an artist and long-time laser cutting client who uses laser-cut parts in his prop and replica builds. Every time we ship a laser order to him, I eagerly await a new Facebook post showing off his latest project.

His work is extremely meticulous, skipping no detail in even the tiniest components. One of his more recent projects involves a tiny power level indicator on a “Proton Gun” replica from the movie Ghostbusters. Buying a power level indicator wasn’t an option; the ones he could find were made for aviation and cost over $1,000!

With a little trial and error, he was able to make them himself for a fraction of the cost by casting them out of resin, using our laser-cut parts to create the cast. A few of the design attempts did not come out well when cut from 1/8" acrylic since some of the features in the designs were much smaller than the thickness of the material (the design is only around 1/4" wide!). We cut various materials and thicknesses from 0.004" Mylar to 1/8" acrylic and a combination of thinner parts did the trick.

I’ll be sharing more awesome projects from Throwing Chicken in the future, but you can also check out his Artist page on Facebook for more updates. If you’d like to purchase a Ghostbusters Proton Gun Replica Kit, they’re sold on the Throwing Chicken Etsy shop.

If you have a cool project you’re working on and need some laser-cut parts: “Who ya gonna call?” (PO-LOLU!)

Power level indicator replica for Ghostbusters Proton Gun.

Vector plans for laser-cut power level indicator replica layers for molding.
Close-up of cast power level indicator replica case.
Close-up of cast power level indicator replica case with laser-cut interior layers.
Close-up of finished power level indicator replica.
Power level indicator replica with LEDs powered on.
Close-up of power level indicator replica with LEDs powered on.
Power level indicator replica installed in the Proton Gun.
Power level indicator replica installed in the Proton Gun with LEDs on.

LVBots March 2014 dead reckoning competition

Posted by Kevin on 18 March 2014
Tags: lvbots

On March 6, LVBots held another competition at Pololu. This time, it was a dead reckoning contest: each robot had to find a line course and follow it to its end while keeping track of its position, then try to return to its starting position without any external navigational aids. Scoring was based on how close to the starting position the robot ended up, as well as how quickly it got there. The complete rules are available here (23k pdf). You can see a selection of the entries in this video compilation from the contest.

David has already posted about his entry. My robot was R2-DR, the miniature astromech droid, and I’ll be writing a post about it soon, too.

Are you in the Las Vegas area? Check out the LVBots Meetup page and drop by this Thursday, March 20, to see the robots in person!

Updates: You can read more about each of our robots in these blog posts:

Maestro-controlled Pan, Tilt, and Zoom (PTZ) dome camera

Posted by Brandon on 18 March 2014

Pololu forum member Dev255 modified a PTZ dome camera system to be controlled by an old Xbox joystick using a 24-channel Maestro servo controller. The Maestro reads 5 potentiometers on the Xbox joystick, along with some buttons, and correlates the readings to a speed and direction value. This data is converted to the Pelco D protocol that is used by the camera and gets sent to the camera from the Maestro. The LEDs on the joystick are used to indicate the program status. He also uses the Maestro to control a 4×20 character LCD display shown in the video below.

For more information on this project, see Dev255’s original forum post.

New products: MinIMU-9 and AltIMU-10 v3

Posted by Ben on 17 March 2014
Tags: new products
New products: MinIMU-9 and AltIMU-10 v3

We are happy to introduce new v3 versions of our MinIMU-9 and AltIMU-10 inertial measurement units (IMUs). These sensor modules are the same compact sizes as their predecessors and have same pin-out, but they are based on ST’s newer and better L3GD20H 3-axis gyro and LSM303D 3-axis accelerometer/magnetometer. The nine independent rotation, acceleration, and magnetic measurements from these sensors provide all of the information required make an attitude and heading reference system (AHRS). In addition to this, the AltIMU-10 v3 incorporates an LPS331AP digital barometer that can be used to measure pressure and altitude.

The new revisions offer a wider magnetic sensing range and a more accurate and stable gyro, all with lower power consumption, and they include an extra pin for changing the I²C slave addresses so that two boards can be used on the same I²C bus. They should generally be usable as drop-in replacements for our previous MinIMU-9 v2 and AltIMU-10 modules—which we have put on clearance—though changes to register locations might require updates to software that is not based on our Arduino libraries.

We also have individual carrier boards available for the L3GD20H gyro, LSM303D accelerometer/magnetometer, and LPS331AP barometer if your application doesn’t require quite so much data or if you want to build your own AHRS unit.

ToDo and Babel by Chris Eckert

Posted by Jon on 17 March 2014

Chris Eckert makes devices that explore the artistic potential of factory automation. One of his works, entitled ToDo, is an automated wall mounted device that seems to continuously write a never-ending list of things to do. Two stepper motors control the position of a pen over a roll a paper, and a servo controls the pen’s up/down movement. The device is controlled by an Arduino Uno and two of our A4988 stepper motor drivers. You can find more details about the construction in Chris’s blog posts about Todo and see more of Todo on its gallery page.

Chris is currently working on another project called Babel, which will feature about 20 devices similar to ToDo.

You can learn more about Chris and his artwork on his personal website.