AdafruitFeather nRF52 Bluefruit LE - nRF52832

This board works as described, so long as you read the notes about this device on Adafruit's page. I've read a few reviews about this product and I have to really wonder if they did any of that. The first thing you need to do is to upgrade the bootloader. Easy enough following Adafruit's directions and Arduino IDE. Also, do not pair the device before running the Adafruit App, or you will not see it in the App. Following these simple instructions will save you much grief and also prevent you from leaving a 1 star review and looking silly as everyone else follows the instructions and winds up having no troubles.

Blazing fast, super low power consumption, and bluetooth works well for my bluetooth HID keyboard application.Be ware that certain libraries won't work for this if they haven't been ported to the NRF52 chipset yet (mainly anything that's chip specific such as setting PWM frequency or triggering low-power mode).Adarfuit has a quite complete "Adafruit_nRF52_Arduino" git repo for their library with great examples that work flawlessly out of the box. Would buy again for my next bluetooth project.

This works really well, it's easy to program for as it basically uses the arduino ide out of the box. Range was a bit low, maybe 15 feet for my HID application but i can live with it. I only wish win7 had ble support

This board is really well designed, has tons of resources, and comes with a lot of examples. Unfortunately the Bluefruit app these examples should communicate with do not work on my android device. Best I can tell it uses a proprietary uart interface and this isn't playing well with Adafruit's app or any of the Android Bluetooth terminals I've tried (including the one for the chip manufacturer Nordic). Hope they release an update soon that corrects this.If you're communicating with iOS this is a 5 star device.

Make sure you upgrade the bootloader before trying to flash your sketch onto the device.Arduino IDE>Tools>Programmer:>Bootloader DFU for Bluefruit nRF52Arduino IDE>Tools>Burn Bootloader

I used this as the controller for a Guggenhat project and while it took significant code modification it was well worth it. Low battery draw, good processing power, and great bluetooth connectivity.

Awesome. Just what I needed for my IOT

I have spent 10 hours trying to get a sketch into this little guy. There are several additional libraries and back-end files that need to be added and I still have not been able to figure out the correct combination. The adafruit app seems to load on IOS and recognize the feather, but not the pinouts or the neo-pixel programming. Im sure I am just missing a simple file here or there, however dont have any more time to put into it. Particle photon and basic uno/nano were 30x easier to figure out. Would not recommend for those without coding and developer experience.