# Pololu Blog

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.

# Video: LVBots May 2018 line following competition

Posted by Ryan on 13 June 2018

LVBots held a line following competition at Pololu on May 24th. This time we had our “classic” line following course like in previous competitions, and an “advanced” course with gaps, intersections, tighter turns, and shortcuts. Continued…

# New Products: TB67S249FTG and TB67S279FTG Stepper Motor Driver Carriers

Posted by Jan on 8 June 2018
Tags: new products

I am happy to announce the release of two new stepper motor driver products, carriers for Toshiba’s TB67S249FTG and TB67S279FTG. The only difference between the two is the maximum current supported, and with operation up to 47 V, the TB67S249FTG is our highest-power stepper motor driver. Both chips offer several innovative features, including Toshiba’s Active Gain Control (AGC):

Ben and I met with some Toshiba reps at the CES show earlier this year and got to see the demo setup shown starting from around 1:45 in that video, and it looks like it could be great for many applications where the drivers and motors are inefficiently running at maximum current all the time.

The folks at Toshiba were also excited about their Advanced Dynamic Mixed Decay (ADMD) feature:

The last special feature that I’ll point out is the internal current sensing, which Toshiba calls Advanced Current Detection System (ACDS). This is not very relevant when comparing our assembled breakout boards, but if you are considering using the driver chips directly in your own design, not having to add two big current sense resistors is a big plus.

Because these stepper motor driver ICs have so many features, we made breakout boards larger than our usual small stepper driver carriers (popular on RAMPS and similar projects) so that we could fit all the necessary control pins. We are looking into the feasibility of fitting this chip into that smaller 0.6″ × 0.8″ form factor and what mix of features we would make accessible on it.

As with all of our new product announcements, we are offering an introductory discount to make it extra easy to try out these new drivers. Be among the first 100 customers to use coupon code TB67SINTRO (click to add the coupon code to your cart) and get 40% off on up to three units of each type.

# Now available: VL53L1X library for Arduino

Posted by Kevin on 6 June 2018
Tags: arduino

We’ve released a basic VL53L1X library for Arduino to make it easier to get started using an ST VL53L1X time-of-flight distance sensor with an Arduino-compatible controller.

Because of how complex the VL53L1X is and how difficult it is to learn how it works, developing a library for it has been more of a challenge than writing one for a typical sensor like an LSM303 accelerometer/magnetometer. Continued…

# Mycronic MY600 solder paste jet printer first print

Posted by Jan on 30 May 2018

Installation of our new Mycronic MY600 that arrived earlier this month is going smoothly. Here are a few pictures and a video from our first test print on a Pololu PCB panel.

That footage of the jet printer in action is not sped up!

# Save on all active Pololu-brand products, now through Tuesday

Posted by Ben on 25 May 2018

Over the next few days, we’re welcoming summer by discounting all active Pololu-brand products, which is almost everything we make. If you’re about to have a lot of free time on your hands, why not spend some of it building a robot? And if you’re going to be as busy as ever this summer, why not unwind by building a robot?

Check out the sale page for details!

Please note that we will be closed on Monday for Memorial Day, so orders will not ship until Tuesday, May 29.

# MY600 solder paste jet printer arrived!

Posted by Jan on 18 May 2018

In my February post about our new equipment, I wrote about why I did not get a jet printer for solder paste. Well, I ended up getting one after all, and it arrived today.

We have a great building, but we don’t have loading docks, which always makes these big equipment deliveries a bit more of an adventure. Despite assurances that the crate would be at the back of the truck (and that it would have a lift gate that could handle the weight), it arrived way at the front.

At least it wasn’t as big of a crate in as deep of a truck as this time. The Mycronic MY600 jet printer is not the biggest machine, but it weighs a ton because of its granite base. And by “it weighs a ton”, I mean literally more than two tons. Especially with the weight of the crate and the other accessories in there, it was way too much for the lift gate. We tried to get two pallet trucks under it but could not get it to move, even after repositioning the truck to make the crate moving downhill.

The big forklift we rented had not arrived yet, but our smaller forklift was able to add enough pulling power to get the crate to the back of the truck.

I like noticing that silver Honda in the back of some of these pictures. Here it is almost sixteen years ago (more about our first ten years in Vegas here):

The big forklift arrived just in time to keep us from attempting some small forklift plus lift gate kind of stunt.

The crate had a very lopsided weight distribution, and the crate had some peculiar skids that required some precision alignment to get the fork into the pocket. (The small gap was too small for the pallet trucks, which contributed to the earlier difficulty in moving the crate with pallet trucks.)

I really liked truck driver Sharrieff, with a great “we’re going to work together and we’re going to get this crate down” attitude. I just noticed now as I wrote this up that he’s the owner of his trucking company.

With the crate in our warehouse and the sides removed, it was easier to see why the weight distribution was so off-center.

And here it is in its temporary home next to the Europlacer stencil printer we got earlier this year:

It’s a temporary home since we will be doing some major remodeling of our building later this year. At the moment we have two full SMT assembly lines, with the newest pick-and-place machine separately on its own in a batch setup. Once we free up more space on the main manufacturing floor, we should be putting the jet printer in line with the pick and place machine in a third complete line that should be ultra-optimized for efficient manufacturing in small quantities. Installation of the new jet printer isn’t until after Memorial Day, and I will be sure to post more updates once we have the machine in action.

# New Product: TB9051FTG Motor Driver Carrier

Posted by Jan on 14 May 2018

This is the second new motor driver product in less than a week, and I’m really excited about this one: the TB9051FTG from Toshiba. The TB67H420FTG I posted about the other day has this new part beat for higher voltages, but its one shortcoming for our purposes is that it doesn’t work at lower voltages. This new TB9051 doesn’t go up into those voltages where it starts getting dangerous, but it covers a great operating range of 4.5 V to 28 V, with transient operation to 40 V, which means you can use this driver with everything from 6 V lead-acid batteries and 2-cell LiPo packs all the way up to 24 V systems and 6-cell LiPo packs, maybe even 7-cell packs. The operating voltage range is similar to another recent favorite of mine, Maxim’s MAX14870, but this new Toshiba part delivers almost double the current.

With its excellent operating voltage range and great current ability for an integrated package, I expect the TB9051 to be an ideal all-around DC brushed motor driver for most indoor robots and other projects that do not involve moving frighteningly large objects at potentially catastrophic speeds. The chip seems positioned to compete performance-wise with my previous almost-favorite chip, the Motorola Freescale NXP MC33926. That chip would have been my favorite if it had been easier to work with Freescale, and things have only gotten worse since NXP acquired them and then got distracted by yet another merger, this time with Qualcomm, which seems to have been in limbo forever. Maybe their sales are actually doing great, and we just have a hard time with them because they are busy with bigger customers. In any case, a part with great performance is not so great overall if it’s difficult to get it, so you can expect us to be updating some of those products that use the NXP part to use the Toshiba part instead.

One pretty obvious feature the TB9051 has over the MC33926 is its smaller size, from 8 mm x 8 mm down to 6 mm x 6 mm, which is great for getting these onto smaller boards in smaller spaces, but it might also have some ramifications for how it tolerates pushing the limits of the specs. We liked how the MC33926 was able to endure lots of abuse from customers who were pushing it because it was our highest-voltage integrated driver. The TB9051 is, like the MC33926, an automotive-rated part, so it is intended to last a long time in harsh conditions. It’s interesting to see how thick the packages for these chips are, and I like their thickness (similar to how I like the proportions on 737 airplanes):

This video makes it seem like Toshiba is quite proud of their packaging accomplishment with the TB9051FTG:

Update: It looks like the above video might no longer be available on youtube, but it is still available on the Toshiba website.

Is the “competitor” in this video the MC33926? Sure seems like it to me. I know of no other part like that, and I keep looking.

Toshiba has not publicly posted a complete datasheet for the TB9051FTG yet, so the product page for our carrier only has a preliminary summary document. Our product page has more information about how to use the device, and we are working on getting a complete datasheet that we can post.

Since I expect this driver to hit a nice sweet spot for many of our customers’ general-purpose motor control needs, it’s a good candidate for using in some higher channel count products. We have not gone much beyond two motors (the TReX motor controllers have a third, unidirectional channel), and I would like to know what kind of interest there is in single boards that can control three or more motors. If you would like to see such products, please let me know.

# New product: TB67H420FTG Dual/Single Motor Driver Carrier

Posted by Jan on 9 May 2018
Tags: new products

Hey! We have a new dual motor driver carrier for Toshiba’s exciting TB67H420FTG that offers quite the power jump from the TB6612FNG we popularized over a decade ago. This chip has a recommended operating range of 10-47 V and can deliver peaks of 4.5 A per channel. In our tests on this carrier, without additional heat sinking or airflow, the maximum continuous current is about 1.7 A per channel.

One of the most common questions we get about our motor drivers is whether the outputs can be paralleled to drive a single bigger motor. The TB67H420FTG specifically has that feature built-in so that you can safely do that while only requiring control signal connections for one channel. This brings the available current for single-motor operation to 9 A peak and about 3.4 A continuous.

The TB67H420FTG has a maximum supply voltage of 50 V, making it one of the highest-voltage drivers we have available. Please note that we populated with 50 V capacitors on the supply line, so there is less margin there than on our usual products if you want to push the upper voltage limits of this chip. As with most of our carriers, we also added reverse voltage protection. The MOSFET we use for that is a 40 V max MOSFET, so the maximum reverse voltage that it protects you from is that same 40 V. If you’re wondering why we didn’t use higher-voltage parts, it’s because the next standard voltages are much higher, 100 V in the case of the capacitors. Getting the same capacitance at that rating would require bulkier, more expensive capacitors for almost no benefit. I’m telling you here in case you are one of those people who like to put 55 V on a 50 V max part just to see what will happen.

Be among the first 100 customers to use coupon code TB67H420INTRO (click to add the coupon code to your cart) and get up to three units at the introductory special price of \$5.95 each. The first batches are just coming out of production, so even if the available stock goes to zero, you can still backorder with the coupon price and chances are that we will be able to fill your order the same day.

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