Author Archives: Ben

(A Little More Than) Twelve Days of Christmas Sale

via Pololu Blog


If you missed our Black Friday sale or realize you didn’t quite get everything you wanted, don’t fret: we have all active Pololu-brand and PCX products on sale for 12% off, and we are offering 20% off twelve broad categories of our products. The sale runs through noon PST on Friday, December 22, but be careful to order early for delivery before Christmas. Save on your Christmas shopping, or stock up now on robot parts for the new year. Check out the sale page for all the discounts and coupon codes. Merry Christmas!

Our 20D gearmotors with long-life carbon brushes are now available with extended motor shafts

via Pololu Blog

20D mm metal gearmotor CB with long-life carbon brushes.

20D mm metal gearmotor CB with long-life carbon brushes and an extended motor shaft.

Magnetic Encoder Kit for 20D mm Metal Gearmotors assembled on a 20D mm metal gearmotor with extended motor shaft.

Last month when we introduced versions of our 20D gearmotors with long-life carbon brushes, we mentioned units with extended motor shafts were in the works. Well, I’m happy to announce that option is now available for both the 12V CB and 6V CB 20D gearmotors, making it possible to use them with encoders like our magnetic encoder kit. The following table shows our full selection of 20D gearmotors, which has now grown to 72 options:

Rated
Voltage
Brush Type Stall
Current
@ Rated Voltage
No-Load
Speed
@ Rated Voltage
Approximate
Stall Torque
@ Rated Voltage


Single-Shaft
(Gearbox Only)


Dual-Shaft
(Gearbox & Motor)
12 V long-life
carbon
(CB)
1.6 A 570 RPM 26 oz-in 25:1 12V CB 25:1 12V CB dual shaft
450 RPM 33 oz-in 31:1 12V CB 31:1 12V CB dual shaft
225 RPM 58 oz-in 63:1 12V CB 63:1 12V CB dual shaft
180 RPM 75 oz-in 78:1 12V CB 78:1 12V CB dual shaft
140 RPM 85 oz-in 100:1 12V CB 100:1 12V CB dual shaft
110 RPM 110 oz-in 125:1 12V CB 125:1 12V CB dual shaft
90 RPM 130 oz-in 156:1 12V CB 156:1 12V CB dual shaft
72 RPM 160 oz-in 195:1 12V CB 195:1 12V CB dual shaft
57 RPM 200 oz-in 250:1 12V CB 250:1 12V CB dual shaft
45 RPM 250 oz-in 313:1 12V CB 313:1 12V CB dual shaft
36 RPM 290 oz-in 391:1 12V CB 391:1 12V CB dual shaft
29 RPM 350 oz-in 488:1 12V CB 488:1 12V CB dual shaft
6 V long-life
carbon
(CB)
2.9 A 590 RPM 22 oz-in 25:1 6V CB 25:1 6V CB dual shaft
470 RPM 28 oz-in 31:1 6V CB 31:1 6V CB dual shaft
230 RPM 54 oz-in 63:1 6V CB 63:1 6V CB dual shaft
190 RPM 62 oz-in 78:1 6V CB 78:1 6V CB dual shaft
150 RPM 72 oz-in 100:1 6V CB 100:1 6V CB dual shaft
120 RPM 87 oz-in 125:1 6V CB 125:1 6V CB dual shaft
93 RPM 110 oz-in 156:1 6V CB 156:1 6V CB dual shaft
75 RPM 130 oz-in 195:1 6V CB 195:1 6V CB dual shaft
60 RPM 170 oz-in 250:1 6V CB 250:1 6V CB dual shaft
46 RPM 220 oz-in 313:1 6V CB 313:1 6V CB dual shaft
37 RPM 260 oz-in 391:1 6V CB 391:1 6V CB dual shaft
30 RPM 310 oz-in 488:1 6V CB 488:1 6V CB dual shaft
6 V precious
metal
2.9 A 590 RPM 22 oz-in 25:1 6V 25:1 6V dual-shaft
470 RPM 28 oz-in 31:1 6V 31:1 6V dual-shaft
230 RPM 54 oz-in 63:1 6V 63:1 6V dual-shaft
190 RPM 62 oz-in 78:1 6V 78:1 6V dual-shaft
150 RPM 72 oz-in 100:1 6V 100:1 6V dual-shaft
120 RPM 87 oz-in 125:1 6V 125:1 6V dual-shaft
93 RPM 110 oz-in 156:1 6V 156:1 6V dual-shaft
75 RPM 130 oz-in 195:1 6V 195:1 6V dual-shaft
60 RPM 170 oz-in 250:1 6V 250:1 6V dual-shaft
46 RPM 220 oz-in 313:1 6V 313:1 6V dual-shaft
37 RPM 260 oz-in 391:1 6V 391:1 6V dual-shaft
30 RPM 310 oz-in 488:1 6V 488:1 6V dual-shaft

Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. In order to avoid damaging the gearbox, we recommend keeping continuously applied loads under 50 oz-in (3.5 kg*cm) for the versions with precious metal brushes and under 70 oz-in (5 kg-cm) for the versions with carbon brushes (the ones with “CB” in the name). Stalls can also result in rapid (potentially on the order of a second) thermal damage to the motor windings and brushes, especially for motors like this that can deliver a lot of power for their size; a general recommendation for brushed DC motors is to limit continuous current to approximately 25% of the stall current.

Black Friday deals keep coming from Pololu and from Adafruit

via Pololu Blog

Our Black Friday/Cyber Monday Sale is nearing the halfway point; thank you to all of those who have already ordered! Today’s doorbusters are gone, but the rest of the daily specials are still active, and a lot more great deals are still coming your way, including the weekend deals we just released. We’re not doing any doorbusters Saturday and Sunday, just lots of extra discounts on big categories, so take your time looking around.

The weekend deals include two items we have never had on sale before: smart servos from XYZrobot and a 6DOF robot arm based on those servos. We recently released an Arduino library for the A1-16 smart servos and arm, making them especially easy to expand beyond their preconfigured sequences for use in your own advanced projects.

Our doorbusters will return starting at 6 AM on Cyber Monday, and rumor has it that might be a prime opportunity to snag one or two of our new Balboa balancing robots!

By the way, our friends at Adafruit are having their own Black Friday sale this weekend, with 15% off their entire catalog and 20% off their Feathers and accessories, plus free items for orders over certain amounts. You can find all the details on the Adafruit blog.

New 20D gearmotors available with 12 V windings and with long-life carbon brushes

via Pololu Blog

We love motors here at Pololu, and we are committed to offering you the best selection so that you can find just the right drive solution for your project. Our latest efforts have gone into expanding our selection of 20D gearmotors to include 12 V versions, which have approximately the same performance at 12 V as our 6 V versions do at 6 V, just with half the current draw. This in turn enables the use of lower-current (and typically lower-cost) motor drivers in applications with access to higher voltages.

Additionally, we noticed that our original 6 V versions do not last as long as we would like in some applications, so we made these new 12 V versions with long-life carbon brushes instead of precious metal brushes, and we released new versions of our 6 V motors with long-life carbon brushes as well. These versions have “CB” in their names, and they can be differentiated from versions with precious metal brushes by their copper-colored terminals.

20D mm metal gearmotor precious metal brushes (left) next to 20D 6V CB and 12V CB long-life carbon brushes.

Please note that making the brushes more robust can just move the failure point to the windings or gears if you try to push the motors too hard, but if you use them around their nominal voltages and keep the continuous load low (under around 20% of the stall torque or 1 kg-cm, whichever is lower), the carbon brushes allow the motors to last several times longer than versions with precious metal brushes.

Changing the brushes does affect the performance in ways beyond lifetime (e.g. the starting voltage is generally a little higher with the carbon brushes), so we are continuing to offer precious metal versions of our 6 V motors for now, but we might phase those out in the future. Please contact us or post a comment below if continued availability of the precious metal versions is important to you.

Currently, only the 6V versions with precious metal brushes are available with a rear motor shaft that can be used to add an encoder, like our magnetic encoder for 20D mm metal gearmotors, but the 6V CB and 12V CB motors should be available with this rear shaft option by the end of November.

With the addition of these new units, our selection of 20D gearmotors now spans nearly fifty options:

Rated
Voltage
Brush Type Stall
Current
@ Rated Voltage
No-Load
Speed
@ Rated Voltage
Approximate
Stall Torque
@ Rated Voltage


Single-Shaft
(Gearbox Only)


Dual-Shaft
(Gearbox & Motor)
12 V long-life
carbon
(CB)
1.6 A 570 RPM 26 oz-in 25:1 12V CB
450 RPM 33 oz-in 31:1 12V CB
225 RPM 58 oz-in 63:1 12V CB
180 RPM 75 oz-in 78:1 12V CB
140 RPM 85 oz-in 100:1 12V CB
110 RPM 110 oz-in 125:1 12V CB
90 RPM 130 oz-in 156:1 12V CB
72 RPM 160 oz-in 195:1 12V CB
57 RPM 200 oz-in 250:1 12V CB
45 RPM 250 oz-in 313:1 12V CB
36 RPM 290 oz-in 391:1 12V CB
29 RPM 350 oz-in 488:1 12V CB
6 V long-life
carbon
(CB)
2.9 A 590 RPM 22 oz-in 25:1 6V CB
470 RPM 28 oz-in 31:1 6V CB
230 RPM 54 oz-in 63:1 6V CB
190 RPM 62 oz-in 78:1 6V CB
150 RPM 72 oz-in 100:1 6V CB
120 RPM 87 oz-in 125:1 6V CB
93 RPM 110 oz-in 156:1 6V CB
75 RPM 130 oz-in 195:1 6V CB
60 RPM 170 oz-in 250:1 6V CB
46 RPM 220 oz-in 313:1 6V CB
37 RPM 260 oz-in 391:1 6V CB
30 RPM 310 oz-in 488:1 6V CB
6 V precious
metal
2.9 A 590 RPM 22 oz-in 25:1 6V 25:1 6V dual-shaft
470 RPM 28 oz-in 31:1 6V 31:1 6V dual-shaft
230 RPM 54 oz-in 63:1 6V 63:1 6V dual-shaft
190 RPM 62 oz-in 78:1 6V 78:1 6V dual-shaft
150 RPM 72 oz-in 100:1 6V 100:1 6V dual-shaft
120 RPM 87 oz-in 125:1 6V 125:1 6V dual-shaft
93 RPM 110 oz-in 156:1 6V 156:1 6V dual-shaft
75 RPM 130 oz-in 195:1 6V 195:1 6V dual-shaft
60 RPM 170 oz-in 250:1 6V 250:1 6V dual-shaft
46 RPM 220 oz-in 313:1 6V 313:1 6V dual-shaft
37 RPM 260 oz-in 391:1 6V 391:1 6V dual-shaft
30 RPM 310 oz-in 488:1 6V 488:1 6V dual-shaft

Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. In order to avoid damaging the gearbox, we recommend keeping continuously applied loads under 50 oz-in (3.5 kg*cm) for the versions with precious metal brushes and under 70 oz-in (5 kg-cm) for the versions with carbon brushes (the ones with “CB” in the name). Stalls can also result in rapid (potentially on the order of a second) thermal damage to the motor windings and brushes, especially for motors like this that can deliver a lot of power for their size; a general recommendation for brushed DC motors is to limit continuous current to approximately 25% of the stall current.

Free Circuit Cellar magazine October 2017

via Pololu Blog

Get a FREE copy of Circuit Cellar magazine’s October 2017 issue issue with your order, while supplies last. To get your free issue, enter the coupon code CIRCUIT1017 to your shopping cart, or click the link. The magazine will add 6 ounces to your order weight when calculating your shipping options.

For back issues and more information, see our free Circuit Cellar magazine offers.

1″ (2.5 cm) and 2″ (5 cm) premium jumper wires and wires with pre-crimped terminals

via Pololu Blog

Premium Jumper Wire 60-Piece 6-Color Assortment M-F 2".

Wires with Pre-crimped Terminals 60-Piece 6-Color Assortment M-F 2".

Our popular premium jumper wires and wires with pre-crimped terminals are a convenient way to make quick, neat connections to 0.1″ (2.54 mm) connectors and solderless breadboards, and they are now available in shorter 1″ and 2″ lengths. Each new length is available in three gender combinations (female-female, male-female, and male-male) and seven color combinations:

  • black 10-pack
  • red 10-pack
  • yellow 10-pack
  • green 10-pack
  • blue 10-pack
  • white 10-pack
  • multi-color 60-pack (10 each of all six colors)

Our wires with pre-crimped terminals work with our 0.1″ crimp connector housings to make custom cables with the pin arrangement of your choosing. You can easily make cable harnesses or assemblies that branch from one connector on one side to multiple connectors on the other, and you can also cut off one pre-crimped end and solder the wires directly to components to make swapping connections easy:

The premium jumper wires are just wires with pre-crimped terminals that have 1×1 crimp connector housings already installed over the crimp pins.

You can use the following selection boxes to get to a specific pack of premium jumper wires:

Select options:

and you can use the following selection boxes to get to a specific pack of wires with pre-crimped terminals:

Select options: