• ### New product: CH Robotics UM7-LT orientation sensor

- 24 May 2019

Hello, Pravin.

https://forum.arduino.cc/index.php?topic=616027

In general, if the other UM7 that you ordered has the same issue, that is more concrete evidence that there is an issue with your setup or code. Also, you might try directly contacting RedShift Labs, who has taken over from CH Robotics as manufacturer of the UM7:

https://www.redshiftlabs.com.au/

-Jon

• ### Building a Raspberry Pi robot with the Romi chassis

- 13 May 2019

Hello, George.

Thanks for letting us know; we've updated our posts.

-Jon

• ### David's line following robot that learns the course

- 14 March 2019

Hello, Pratz.

A 3 degree curve is almost a straight line, so I suspect the behavior of David's code would not be very different in that system. If you want to change how the robot drives for other curves or features on the third lap, you would have to come up with a way of telling when the robot got to that feature and add some your own code to handle it.

-Jon

• ### Jon's line following robot: Usain Volt 2.0

- 14 March 2019

Like I mentioned in an earlier reply, I do not think it is useful to upload my code since it is entirely based on and not much different than our 3pi's PID line following code, which you can find inside the 3pi's user's guide.

-Jon

• ### PID line follower with 5" robot chassis

- 12 February 2019

Hello, vinay.

The maker of that robot, Enigmerald, links to a tutorial about PID for line following that they wrote.

-Jon

• ### PyTic - Python interface for Pololu Tic Stepper Motor Controllers

- 23 November 2018

Hello, anon.

-Jon

• ### New product: Sharp GP2Y0A51SK0F Analog Distance Sensor 2-15cm

- 29 October 2018

Hello, marco.

We noticed your post on our forum and I responded to it:

https://forum.pololu.com/t/gp2y0d815z0f-slotcar-application/15939

-Jon

• ### Building a Raspberry Pi robot with the Romi chassis

- 24 September 2018

Hello, Gregg.

You can just call a_star.motors(200,200); the int() function is for converting strings to integers.

Also, we noticed that you created your own topic on our forum:

https://forum.pololu.com/t/romi-raspberry-pi-motor-control/15704

The forum is our preferred place for troubleshooting code, so please continue your discussion there.

-Jon

- 2 August 2018

Hello, Pedro.

On our website and in our documentation, we try to specify torque in metric units of kg⋅mm or kg⋅cm, and it is implied that the letters kg represent kilogram-force (kgf). This is a common way to express torque; you can read more about this convention under the "Units of force and acceleration" section of this blog post.

By the way, the weight of a mass of 1kg is 1kgf. So, there is no multiplication by 10 involved in converting between those. Factors of 10 (or 9.8) would come up if you need to convert between N and kgf or mm and cm.

-Jon

• ### Now available: VL53L1X library for Arduino

- 25 June 2018