We've updated the DIY EDTracker PCB that we sell to make it better suited to the MPU-9250 breakouts boards that are becoming increasingly popular. It's now available on the website shop.
Invensense have discontinued the MPU-9150, and the MPU-6050 board is becoming less popular due to the lack of a magnetometer. The latest MPU-9250 is becoming more popular, but manufacturers of breakout boards using it are generally going with 10-pin breakout designs rather than the previous 8-pin. The additional 2 pins are not required by EDTracker, however it did create a little extra work for people using the Revision 2 PCBs as they needed to leave out the button, and also do a little bit of manual filing!
The new design is slightly larger, so that the 10-pin boards can be accomodated along with the tactile button. No modification to the boards is needed. The design is backwardly compatible with the 8-pin boards so you can still use a 6050 or 9150 breakout if you wish.
Any new features?
We have snuck a little additional DIY feature onto the board, since we had the extra space available... we've added in a few mounting points for components to make a power supply for infra-red LEDs, so anyone wishing to make a hybrid head tracker using both MEMS sensors *and* traditional point tracking can now do so! The board takes the 5v USB power supply and gives you mounting pads for a suitable PTC fuse, a current-limiting resistor and then a 2-pin power header to run to your LEDs. Further detailed instructions will follow in the coming weeks.
This feature is very much an "expert" addition on the side for people who really like to tinker! It's entirely optional - you don't have to do anything with it in order to enjoy the simple 3DOF tracking that DIY EDTracker offers. It's for those who want to go full geek and use early versions of Opentrack to make a 2-source, hybrid tracker. Be advised you'll need to use Opentrack 2.2 as the twin tracker support was removed from Opentrack at version 2.3. However we've tried it in 2.2 and it works, and it works really well too! You use the MEMS gyro to provide the rotational aspects with very low latency and high accuracy, and then the point tracking can be used to provide the lateral movement at the slightly laggier pace of point tracking...
Revision 2 stock clearance
The old V2 PCBs can now be picked up at a reduced price to clear. Once they're gone, they're gone. As said above, you can still use MPU-9250's with them if you don't mind losing the button and doing a bit of filing, so they represent a nice little bargain for those willing to do a little bit of fiddling!