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This review is from: KY-008 Laser Transmitter Module 650nm 5V Diode For Arduino AVR PIC
Pros: All 3 I ordered work, very easy to use, pins on module are labeled. You only need "S" and "-", stands for Signal and Ground respectively, assuming you're coming from a power source looking to turn it on and off. (If you need always on, I would assume you need to connect + and - to a power source)
Cons: Light bleeds like crazy through the back of this thing. Little electrical tape fixes that no problem though.
Other Thoughts: Do a quick google search on the model number in regards to the pins if you are unsure how to connect.READ FULL REVIEW
This review is from: 4x4 Universial 16 Key Switch Keypad Keyboard for Arduino
Pros: Shipped pretty fast considering it's from China, haven't tested yet so I'll update later if it is not working. But it came at least :) Buttons feel nice
Cons: Non yetREAD FULL REVIEW
Pros: Nothing was broken, most things were in plastic baggies, and the resisters were labeled correctly. Nice little UNO replica, working just fine.
Cons: Seemed like a pile of components just thrown together in a cardboard box. A few items just loose in the box, not in baggies or anything, luckily nothing was damaged, but the presentation of it was horrible. Component list was just a list printed on a sheet of paper, pictures would have been helpful. Also, one of the components has Chinese writing on it, so I'm unsure of which pin is which, at least until I look up that component online...
Other Thoughts: Overall, I'm satisfied with my purchase, price was pretty good. However, that packaging was just sad. But don't let that discourage you, this is a really good kit (even better if you already have some other components) and 99% of the time tutorials online are way better than anything that's included with kits like these (with horrible Chinese to English translations) but this kit doesn't have any instructions included, just a link to something online. But a simple online search will get you all the tutorials and help you need for getting started.READ FULL REVIEW