I’m excited to announce a minor upgrade to the mjbots pi3hat product line, the pi3hat r4.5!

This has a few upgrades over the old r4.4b:

• The input voltage range is expanded from 8-44V to 8-54V.

• All CAN-FD ports have +-58V bus fault protection, up from +-12V.

• 0.1" pin headers are present for the Raspberry Pi I2C, UART, and for 3.3V and 5V outputs

Check it out at mjbots.com today!

Partly to celebrate moteus controllers being back in stock and partly because a lot of important work has backed up, we’ve just released a new firmware version for moteus (2023-02-01) that has a little bit of something for everyone. Future posts will examine some of these features in more detail, but for now you just get the bullet list:

• Support sending and receiving arbitrary data from a UART configured on either of the auxiliary ports

It has been on github for a few days now, but I’m excited to announce the newest moteus firmware release, 2022-07-11. This release includes some big features, and some quality of life improvements all around.

• Flexible I/O subsystem: This release includes the new flexible I/O subsystem. This adds support for many new encoder types and lets you connect them up in a wide variety of ways.
• Cogging torque compensation: Preliminary support for cogging torque compensation is present in this release. It works pretty well on a number of motor types already, future articles will describe it in more detail.
• Encoder eccentricity compensation: This feature lets you linearize the output position and velocity in the face of non-linear encoder readings. A write-up for it is also forthcoming in the not-too-distant-future.
• Transparent no-BRS CAN-FD communication: If your CAN-FD network is only capable of operating at 1Mbps, and you send queries frames with BRS turned off, moteus will now respond in kind. This eliminates most needs to change the CAN bus frequency due to marginal electrical properties.

This is an exciting time for moteus, and the new features will keep coming!

I’ve posted a new release of the firmware for the moteus brushless controller to github!

• https://github.com/mjbots/moteus/releases/tag/0.1-20200822-1

This release has a number of minor improvements in the host tools (for which there continue to be no distributed binaries, you get to build from source). The biggest improvement in the firmware is the improved low-torque operation as documented here and here. If you have any questions or want help upgrading, hop into discord at #moteus and ask!