Good news, after an admittedly long wait, the new alpha2 boards (R3.3) are now available! These boards have a few layout improvements compared to the alpha1 boards, namely:
- Better signal routing allowing wider power traces on the rear side of the board.
- Bigger current sense (shunt) resistors with twice the power rating and twice the resistance (2mOhm instead of 1mOhm), allowing for more accurate current measurements.
- In alpha1 I skipped the ceramic capacitors near the FETs, thinking that high-frequency ringing from transistor switching could be handled by the polymer caps. Evidently I was wrong and the ceramic caps are back.
- Changes in polymer cap arrangement with 3x 180μF instead of 4x 68μF ones for better handling of torque ripple and current transients.
- Same 4-pin DF-13 connectors on all I/O, including 2x CAN, UART and debug port, enabling more flexible connectivity with the same wires.
The Tinymovr store stock is updated, and now you can browse and make your orders! Currently only Tinymovr boards are available, but in the near future it will be stocked with Dev Kits, essential items and accessories.
In the meantime, improvements have been made in both firmware as well as Tinymovr Studio. For a list of detailed changes, please take a look at Github Issues. Here below a few highlights:
- Tinymovr Firmware now has a proper duty cycle limiter that works in dq space (the previous one was just a failsafe that worked in alpha-beta).
- Tinymovr Firmware implements a few changes that improve power usage when idle by up to 20%!
- Tinymovr Studio now has a plotter! It is based on matplotlib and enables fast and lightweight plotting of multiple endpoints of a single or multiple Tinymovrs.