Just started fiddling with this and all three were able to upload the sketch with no problems. For the price they seem to work great and I like their small size (great for a project I don't want to stuff a full size Uno into). My only complaint is that they opted for mini-USB instead of the smaller (and currently much more common) micro-USB, which is the only reason I gave it one star. It would be easy enough to desolder them when adding them to a permanent project (although that would make updating the sketch much more difficult later), but they would be preferable to using the flat and more common Micro-USB. For that reason alone, if I find other options with micro USB and a comparable price, I will choose another option and not this one. up to 4, one in each corner). This isn't a huge problem, but it can make it difficult to securely connect to the project, and anyone planning to use them in this way should be aware of that.
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