nRF52840 General Features: ARM Cortex-M4 CPU with floating point unit (FPU), 1MB internal Flash-For all of your program, SoftDevice, and file-storage needs! 256kB internal RAM-For your stack and heap storage. Integrated 2.4GHz radio with support for: works with Bluetooth Low Energy (BLE)-With peripheral and/or central BLE device support, works with Bluetooth 5-Mesh Bluetooth! ANT-If you want to turn the device into a heart-rate or exercise monitor. Nordic's proprietary RF protocol-If you want to communicate, securely, w/ other Nordic devices. I/O peripherals: USB-Turn it into a USB mass-storage device, use a CDC (USB serial) interface, & more. UART-Serial interfaces w/ support for hardware flow-control. I2C-2-wire bi-directional bus interface, SPI-3+-wire serial interface, Analog-to-digital converters (ADC)-Eight pins support analog inputs, PWM-Timer support on any pin means PWM support for driving LEDs or servo motors. Real-time clock (RTC)-Keep close track of seconds & milliseconds, also supports timed deep-sleep features. Specific Peripherals available on MicroMod nRF52840: Three UARTs-Primary tied to USB interface. Two hardware UARTs. Two I2C Buses. Two SPI Buses-Secondary SPI Bus primarily used for Flash IC. PDM Audio Processing. Two Analog Inputs. Two Dedicated Digital I/O Pins. Two Dedicated PWM Pins. Eleven General Purpose I/O Pins Processor board only, additional carrier board(s) will be needed to use.