Adafruit ItsyBitsy nRF52840 Express

• Quick overview
• Notes
  • 1
• Connections
  • Buttons
    • Analog inputs
  • Rotary encoders
  • Potentiometers
  • FSRs
  • Single-color LEDs
  • RGB LEDs
  • Displays
  • DIN MIDI
  • Touchscreen

Quick overview

• Power: Micro USB
• MCU: nRF52840
• DIN MIDI: Yes [1]
• LED indicators: No
• Digital inputs: 5
• Digital outputs: 6
• Analog inputs: 6
• Schematic: Link

Notes

1

This board doesn't have DIN MIDI connectors and required additional components so those have to be added to board in order to be used. The following schematic should be used:

Pinout is listed in DIN MIDI section.

Connections

Buttons

Button #	Pin 1	Pin 2
0	SCK	GND
1	MOSI	GND
2	MISO	GND
3	D2	GND
4	D13	GND

Analog inputs

Button #	Pin 1	Pin 1	Pin 2
5	A0	GND with 10k resistor	3V
6	A1	GND with 10k resistor	3V
7	A2	GND with 10k resistor	3V
8	A3	GND with 10k resistor	3V
9	A4	GND with 10k resistor	3V
10	A5	GND with 10k resistor	3V

Rotary encoders

Encoder #	Pin 1	Pin 2	Pin 3
0	SCK	GND	MOSI
1	MISO	GND	D2

Potentiometers

Potentiometer #	Pin 1	Pin 2	Pin 3
0	3V	A0	GND
1	3V	A1	GND
2	3V	A2	GND
3	3V	A3	GND
4	3V	A4	GND
5	3V	A5	GND

FSRs

FSR #	Pin 1	Pin 2	Pin 2
0	3V	A0	GND with 1k resistor
1	3V	A1	GND with 1k resistor
2	3V	A2	GND with 1k resistor
3	3V	A3	GND with 1k resistor
4	3V	A4	GND with 1k resistor
5	3V	A5	GND with 1k resistor

Single-color LEDs

Note: current-limiting resistors are required in order to avoid damage to the board.

LED #	Anode	Cathode
0	D12	GND
1	D11	GND
2	D10	GND
3	D9	GND
4	D7	GND
5	D5	GND

RGB LEDs

Note: current-limiting resistors are required in order to avoid damage to the board.

RGB LED #	Anode (Red)	Anode (Green)	Anode (Blue)	Cathode
0	D12	D11	D10	GND
1	D9	D7	D5	GND

Displays

Signal	Display	Pin
Vcc	Vcc	+3V
GND	GND	GND
SDA	SDA	SDA
SCL	SCL	SCL

DIN MIDI

This board doesn't have DIN MIDI connectors so they have to be added to the board with corresponding circuitry. Schematic is available here.

MIDI In	MIDI out
RX	TX

Touchscreen

Screen	Pin
Vcc	+5V*
GND	GND
Rx	RX
Tx	TX