Adafruit Feather nRF52 Bluefruit LE Board for Makers

Here is another connected board for makers with plenty of GPIOs and analog inputs for complex projects. The Adafruit Feather nRF52 Bluefruit LE features an ARM Cortex M4F microprocessor running at 64MHz, 512KB flash, 64KB SRAM, and Bluetooth LE. You get 19 GPIO, 8 x 12-bit ADC pins, and up to 12 PWM outputs.

When you use this for your projects, you can use your iPhone or Android device to interact with it. Simply download the Bluefruit iOS/Android app to get started.