The Adafruit Feather M0 Adalogger is a compact microcontroller board built around the ARM Cortex-M0 processor. It is designed for low-power applications and features an integrated SD card slot, making it ideal for data logging tasks. This versatile board is part of the Adafruit Feather ecosystem, which includes a wide range of compatible add-ons and accessories.
The Adafruit Feather M0 Adalogger has a total of 28 pins, including power, digital, and analog pins. Below is a detailed description of the pinout:
Pin | Name | Description |
---|---|---|
1 | USB | Micro-USB connector for power and programming |
2 | BAT | Battery input (3.7V LiPo) |
3 | 3V3 | 3.3V regulated output |
4 | GND | Ground |
5 | A0 - A5 | Analog input pins (12-bit ADC, also configurable as digital I/O) |
6 | D0 - D13 | Digital I/O pins (D3, D5, D6, D9, D10, D11, D12 support PWM) |
7 | SDA | I2C data line (shared with D20) |
8 | SCL | I2C clock line (shared with D21) |
9 | RX | UART receive (D0) |
10 | TX | UART transmit (D1) |
11 | SD_CS | Chip select for the SD card |
12 | RST | Reset pin (active low) |
13 | EN | Enable pin for 3.3V regulator |
14 | LIPO | LiPo battery charging status indicator |
Powering the Board:
Programming the Board:
Connecting Sensors and Peripherals:
Using the SD Card Slot:
SD
library in Arduino to read/write data to the card.SD
library.#include <SPI.h>
#include <SD.h>
// Define the chip select pin for the SD card
const int chipSelect = 4;
void setup() {
// Initialize serial communication for debugging
Serial.begin(9600);
while (!Serial) {
// Wait for the serial port to connect
}
Serial.println("Initializing SD card...");
// Check if the SD card is available
if (!SD.begin(chipSelect)) {
Serial.println("SD card initialization failed!");
return;
}
Serial.println("SD card initialized successfully.");
// Create or open a file on the SD card
File dataFile = SD.open("datalog.txt", FILE_WRITE);
// Write data to the file
if (dataFile) {
dataFile.println("Temperature: 25.3 C");
dataFile.println("Humidity: 60%");
dataFile.close(); // Close the file
Serial.println("Data written to datalog.txt");
} else {
Serial.println("Error opening datalog.txt");
}
}
void loop() {
// Nothing to do here
}
SD Card Not Detected:
Board Not Recognized by Computer:
Program Upload Fails:
Overheating or Power Issues:
Can I use the Feather M0 Adalogger with 5V sensors?
No, the board operates at 3.3V logic. Use level shifters for 5V devices.
What is the maximum SD card size supported?
The board supports microSD cards up to 32GB formatted as FAT16 or FAT32.
How do I monitor battery voltage?
Use the analogRead()
function on the A7 pin to measure the battery voltage.
Can I use the board without a battery?
Yes, the board can be powered via the Micro-USB port alone.