Adafruit Feather nRF52 Bluefruit LE — nRF52832-intro(0)

For Bio-signal processing & neuro-engineering

Microcontroller and QSPI

• Nordic nRF52840 Bluetooth LE processor
• QSPI flash

Power Pins

• 3.3V
• LIPO Input
• VREG Enable
• USB Power (VBUS)

Digital Pins

• digitalRead() (0 = 0V or 1 = 5V) to read digital signals from input devices.
• digitalWrite() (0V ~ 5V) to send digital signals to output devices.

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PWM Outputs

• PWM (Pulse Width Modulation) is used to control electric power inside the motor coil. (By using this, digital signals seem to be analog signals)

• PIN_DFU / P0.20: If this pin is detected to be at GND level at startup, the board will enter a special serial bootloader mode and will not execute any user code, going straight into bootloader mode. If you wish to use this pin as a pulled high with a pullup resistor your code will execute normally when the MCU starts up.

Analog Pins

• You can convert anolog input to digital output.
• A0 ~ A5
• analogRead() (0 ~ 1023)
• analogWrite() (0 ~ 255)

Bluefruit nRF52 Feather Learning Guide

How to Use nRF52840?

You just need to install the Arduino App.

the initial screen of Arduino.

Digital and Analog Pins | Arduino Documentation

Feather nRF52 can be also connected with an IOS/ Android cell phone using Bluetooth.

GitHub - adafruit/Adafruit_nRF52_Arduino: Adafruit code for the Nordic nRF52 BLE SoC on Arduino

GitHub - adafruit/Bluefruit_LE_Connect_Android_V2: Bluefruit LE Connect Android source code (V2)