Posts by Paul (Page 5)
You are currently viewing a selection of posts from the Pololu Blog. You can also view all the posts.
We are excited to welcome several new distributors that have joined Pololu over the past few months!
To start with, we have gained two new distributors in the United States. We have been following Adafruit Industries (New York, NY) for a long time – I remember receiving a SpokePOV kit as a birthday present back in 2007 – so we are particularly excited that they will now be selling some of our products. They are starting with the Zumo, which they featured in a recent new product video. We will also be distributing some of their products, such as the Adafruit Data Logging Shield for Arduino. Is there anything from Adafruit that you would like to see at Pololu? Please let us know in the comment section.
Anibit Technology (Cary, NC) is another new US distributor, founded in 2013 by engineer Jon Wolfe, who is marketing his own designs along with parts from Pololu and Adafruit. We are looking forward to seeing what else he will create!
Next, MiniRobot (Azcapotzalco, Mexico City, Mexico), joins a number of other Mexican distributors. They carry a large selection of parts, including many Pololu items, as well as Arduinos, components, and prototyping supplies.
Continuing south, we have a new distributor in Viña del Mar, Chile: Zambeca. In addition to carrying a number of Arduino, Lilypad, and robotics-related products, they have been posting some interesting-looking project videos on their blog (in Spanish). We have one other distributor in Chile, MCI Ltd – Olimex Chile, who has been with us since 2009.
We now have a distributor in China, ALSRobotBase, located in Harbin, Heilongjiang province. They have a whole “Pololu” category and are also offering to help customers in China with special orders.
For distributors in your area, you can check out our complete list of almost 200 distributors.
Here at Pololu we love USB and put a USB port on most of the microcontroller boards that we make. One of the lovable things about USB is that it provides a convenient power supply, but making good use of USB power presents a board design challenge: many of our products can be powered from either USB or an external source (e.g. batteries) and require a circuit to select between the two power sources. We call this circuit a power multiplexer, or just power mux.
A simple power mux like the one we use on the Wixel consists of a pair of diodes with a MOSFET that automatically disconnects the less-preferred power source. You can see another instance of the diode mux in the Orangutan SVP schematics (99k pdf). This works, but the forward voltage drop of the diodes can cause the output of the mux to be too low to power 5 V devices.
In the maker community, 5 V is very popular since it is the voltage standard used by numerous devices from Arduinos to Sharp Distance Sensors. Unfortunately for us, 5 V is not important for modern consumer devices like mobile phones, which operate at much lower voltages, so there is not much reason for semiconductor manufacturers to build the kind of devices that we need for good 5 V power multiplexers.
The USB power mux on many Arduinos uses a MOSFET, and does not suffer from the forward voltage drop problem, but it allows current to flow into the USB port in some situations, a potentially dangerous violation of the USB specifications.
So we were excited to find the FPF1320, a chip from Fairchild that implements a better MOSFET-based power mux circuit. The FPF1320 switches up to 1.5 A of current at 1.5 V to 5.5 V with an insignificant voltage drop, and it blocks reverse current into either of the sources. This chip seems like a great solution for USB power and other power-switching situations. Its tiny size, however, makes it inaccessible to most hobbyists:
|Three FPF1320 BGA parts (two with solder balls facing up) among grains of rice and components in 0603, 1206, and SOT-23 packages.|
That’s where we come in! We have made the FPF1320 available on a carrier board that breaks out all of its lines onto breadboard compatible pins and implements a minimal circuit to support automatic power switching. Our carrier board also breaks out a USB Micro-B connector to support USB power-switching applications. This diagram shows how the carrier would be used in a typical USB application:
|Typical connection diagram for using the FPF1320 power multiplexer carrier with USB as the preferred supply.|
Power multiplexers are useful for more than just USB. For example, many devices can be powered by both batteries and an external power jack, with external power preferred when it is available. Our FPF1320 carrier can be connected to two non-USB power supplies:
|Typical connection diagram for using the FPF1320 power multiplexer carrier without USB.|
Building a good power mux is a challenge, and the FPF1320 is not a perfect solution. One frustrating thing about it is that it is disabled (powered off) by default, and enabling it required us to build an additional power mux into the circuit! As you can see in the schematic below, we used the double-diode technique to drive the EN line high:
The diodes, unfortunately, take up more board space than the FPF1320 itself.
While typical applications involve USB and 5 V, our carrier is designed to work over the full range of input voltages supported by the FPF1320; therefore, extra consideration might be required to ensure glitch-free transitions between power sources. Specifically, we designed it to “prefer” one of the power supplies whenever it is present. The board will allow the preferred supply (and hence the output) to drop to 1.5 V or lower before switching, even if a better alternate source is available. Unfortunately, this guarantees that the voltage will always drop to below 1.5 V when switching from the preferred to the alternate source. The chip is capable of a seamless transition, and a more sophisticated application might involve monitoring the levels of both input voltages and switching in an intelligent way. You can also adjust the behavior to match typical applications using a few additional resistors or other components. Our carrier brings out the SEL line to make these kinds of modifications possible in your application.
For more information, see the FPF1320 Power Multiplexer Carrier product page.
We saw this robotic ping-pong ball collector by Will Jessop on the Raspberry Pi blog a few days ago. The robot uses the Pololu 30T Track Set, a Raspberry Pi, and a lot of custom electrical and 3d-printed mechanical parts.
Apparently, Will plans to put his robot into service at the office of his employer, 37signals. This is exciting for us at Pololu because 37signals is the originator and a major sponsor of the Ruby on Rails web framework, on which our website is built. And although we did not attend this year’s RubyConf, we are proud that some of our parts, as shown in the video above, made an appearance.
You can find detailed build information in Will’s ping-pong robot blog posts.
Our Black Friday sale is back, and this one is our biggest yet. We are discounting hundreds of products by 30% to 60% and offering an additional 11% to 15% off orders over $100. The sale coupons and price changes become active in just over 6 hours. We hope these deals give all you robotics and electronics enthusiasts out there a happy start to the holiday season! For coupon codes and sale information see our Black Friday Sale 2013 page.
Get a FREE copy of Elektor magazine’s October issue with your order while supplies last. This offer is only available for orders shipped to USA or Canada. To get your free issue, enter the coupon code ELEKTOR1013 into your shopping cart. The magazine will add 6 ounces to the package weight when calculating your shipping options.
For other issues and more information, see our Free Elektor Magazine Offers page.
Last week we announced the Pololu RC Switch with Relay, the first product in our overhaul of the RC Switch family. Today we released the second new RC Switch product, the Pololu RC Switch with Medium Low-Side MOSFET. This board converts hobby radio control pulses to digital on/off signals and has an integrated medium, low-side MOSFET that allows it to drive moderate loads (up to around 15 A), such as lighting or small actuators.
This product replaces item #1211 and includes valuable new features such as a safe-start mode and user-configurable input direction and threshold.
For more information about the Pololu RC Switch with Medium Low-Side MOSFET, see the product page.
- Our RC Switch overhaul is complete
- New product: 4-Channel RC Servo Multiplexer
- New product: Pololu RC Switch with Relay
We are overhauling our RC Switch family of products, starting with a new and long-awaited addition, the Pololu RC Switch with Relay. This RC relay board makes it easy to control large loads within radio control (RC) systems. Here is an example setup with a typical RC receiver controlling the switch:
The Pololu RC Switch with Relay has advanced features not present in earlier RC switch products, including a safe-start mode and configurable input direction and threshold.
In addition to the assembled version shown above, a partial kit is available for specialized applications such as custom connectors or alternative relays:
|Pololu RC Switch with Relay (Partial Kit).|
For more information about the Pololu RC Switch, see the product page.
- Our RC Switch overhaul is complete
- New product: 4-Channel RC Servo Multiplexer
- New product: RC Switch with Medium Low-Side MOSFET