SD card module with Arduino Nano

Wiring for the SD card module (full size, SPI) on the Arduino Nano (ATmega328P, 5 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

SD card module pin	Role	Arduino Nano pin	Notes
GND	Ground	GND
3V3	Power	5V	Use 3V3 or 5V, not both
5V	Not wired to the board	not connected	Alternative 5 V input through the on-board regulator
CS	SPI chip select	D10 (PB2)
MOSI	SPI MOSI	D11 (PB3)
SCK	SPI clock	D13 (PB5)
MISO	SPI MISO	D12 (PB4)
GND2	Ground	GND

Check before you power it on

Supply: 5 V from the 5V pin.

Test code (Arduino)

// Library: SD (built in)
#include <SPI.h>
#include <SD.h>

void setup() {
  Serial.begin(115200);
  if (!SD.begin(10)) {
    Serial.println("No card: check wiring, the card format (FAT32) and power");
    return;
  }
  File f = SD.open("/test.txt", FILE_WRITE);
  f.println("Hello from the board");
  f.close();
  Serial.println("Wrote test.txt");
}

void loop() {}

Arduino board: arduino:avr:nano. Clones with the old bootloader upload at 57600 baud: choose “ATmega328P (Old Bootloader)” if uploads fail.

Questions

Which Arduino Nano pins do I use for the SD card module?

GND → GND, 3V3 → 5V, CS → D10 (PB2), MOSI → D11 (PB3), SCK → D13 (PB5), MISO → D12 (PB4), GND2 → GND.

Does the SD card module work with the Arduino Nano at 5 V?

Yes: the SD card module runs at 3.3-5 V and the Arduino Nano uses 5 V signals, so no level shifting is needed.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Arduino Nano pinout · SD card module (full size, SPI): all pins and data

The SD card module on other boards

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