After the prototypes that I put on sale on Tindie sold within 2 days, I decided to try and make a larger number of the servo controller shields. I choose to do it with the 16-channel PCA9685 shields, because to be honest I don't trust my own C code enough to inflict it on unsuspecting people. In any case, you can now buy the production version of this on Tindie here:
https://www.tindie.com/products/deshipu/16-channel-servo-shield-for-d1-mini-version-10/
I ordered about 90 PCBs (the Elecrow's 10x10cm offer is the best bang for the buck), but so far I only had components to assemble 5 of them. More components ordered, and I will put them in stock as they arrive. Here's a photo of the ready PCBs:
I also wrote proper documentation manual for this board, it's available here: http://16-channel-servo-shield-for-d1-mini.readthedocs.io/
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