Author Archives: Jon

New product: more Silicone Tires for Pololu wheels!

via Pololu Blog

Silicone Tire Pair for 40×7mm (left) and 32×7mm (right) Pololu Wheels.

We are now offering replacement tires for our 32×7mm wheels and for our 40×7mm wheels. These are intended primarily as replacement parts for our wheels, but they can also be used as nicer tires for other similarly sized wheels.

Pololu wheel 32×7mm on a micro metal gearmotor.

Mini plastic gearmotor 90-degree 3mm D-shaft output with Pololu 32×7mm wheel.

Pololu 40×7mm wheel on a micro metal gearmotor.

Along with the tires we released last month for our larger Pololu wheels, we now have replacement tires available in four sizes that can stretch to work with six different sizes of Pololu wheels:

From left to right: Silicone Tire for 32×7mm, 40×7mm, 60×8mm/70×8mm, and 80×10mm/90×10mm Pololu Wheels.

Tito-Stretch: a Pi Wars robot by Hitchin Hackspace

via Pololu Blog

For the second year in a row, Team Hitchin Hackspace and their robot, Tito-Stretch, placed 4th overall in the Pi Wars! They did this at the Advanced/Pro level, which is Pi Wars’ most challenging competition category. (In case you haven’t heard already: Pi Wars is an international robotics competition that focuses on Raspberry Pi-controlled robots.) The video above features Tito-stretch high-tailing it through the obstacle course event. The team’s speedy performance allowed them to climb to the very top of their division, which is a step above their 2nd place finish in 2018’s obstacle course event.

Tito-Stretch is the latest iteration of the hackspace’s competition robot, which has evolved in name and form over the last few years. As we understand it, the team named the original version of their robot Twenty Two Over Seven (22/7 is one way to approximate pi), abbreviated that to TTOS, and then affectionately transitioned to calling the robot “Tito”. Later, the team lengthened their robot and accordingly appended “-⁠Stretch” to the name.

The designers/builders of Tito-Stretch: Pi Wars team Hitchin Hackspace.

Tito-Stretch on a desk.

Tito-Stretch on gravel.

The Tito-Stretch chassis is a 3D-printed design that uses a pair of skateboard bearings in a way that decouples the front and rear parts of the chassis, allowing each part to roll independent of the other. This passive articulation allows the robot to more consistently maintain all four wheels as solid points of contact on uneven terrain. When assembled, the chassis parts clamp down onto four 12V 25D mm gearmotors, and a VNH5019 motor driver controls each motor. A 5V regulator steps down the voltage of a 3S LiPo and powers a Raspberry Pi 3 Model A+, which is the brain of the operation. The team can remotely control their robot with Bluetooth controllers (they currently use a PS4 controller, but have used other devices in the past), and various accessories like a few VL53L0X time of flight distance sensors help enable autonomous navigation. You can find code for Tito-Stretch, and older versions of Hitchin Hackspace’s Pi Wars robots, on their GitHub page.

Great job on your competition this year, Hitchin Hackspace! We hope to hear more about your robots in the future!

New product: Silicone Tires for Pololu wheels

via Pololu Blog

Silicone Tire Pair for 80×10mm/90×10mm (left) and 60×8mm/70×8mm (right) Pololu Wheels.

We have recently had several requests for just the tires from our largest Pololu wheels, so here they are! The silicone tires are available in two sizes, with the smaller tire working with our 60×8mm and 70×8mm wheels and the larger tire working with our 80×10mm and 90×10mm wheels. The tires are intended primarily as replacement parts for our wheels, but they can also be used as nicer tires for other similarly sized wheels, such as the 2-5/8″ plastic wheels for Futaba servos.

New product: DB15 Screw Terminal Adapter for MCP23X/26X Advanced Motor Controllers

via Pololu Blog

DB15 Screw Terminal Adapter for MCP23X/26X Advanced Motor Controllers with included hardware.

DB15 screw terminal adapter mated to an MCP266 Advanced Motor Controller.

We are now carrying a DB15 Screw Terminal Adapter for MCP23X/26X Advanced Motor Controllers. The adapter breaks out connections from the DB15 connector to a set of screw terminals, making accessing those pins easier during prototyping. It is designed specifically to work with the MCP Advanced Motor Controllers that feature a DB15 connector: the MCP233, MCP236, MCP263, and MCP266. However, it could also be used as a generic breakout board for other hardware that uses the same connector, like old computer joysticks or MIDI devices (where it is called a game port).