MicroMod Data Logging Carrier Board Hookup Guide

Contributors: El Duderino, Nate
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The MicroMod Data Logging Carrier Board is similar the SparkFun Logomatic to offer users a dedicated data logging board but adds the ability for you to pick a MicroMod Processor to customize it for your next data logger project. The Data Logging Carrier board was designed specifically for low power control and sensor data harvesting with the MicroMod ecosystem.

SparkFun MicroMod Data Logging Carrier Board

SparkFun MicroMod Data Logging Carrier Board


The Data Logging Carrier Board allows you to control power to both the Qwiic connector on the board as well as a dedicated power pin for non-Qwiic peripherals such as serial UART or SPI devices so you can pick and choose when to power the peripherals you are monitoring the data from. It also features a charging circuit for single-cell Lithium-ion batteries along with an RTC battery-backup circuit to maintain power for a real-time clock circuit on your Processor Board.

Required Materials

Like all of our MicroMod Carrier Boards, there is no processor included but instead you can plug in a Processor of your choice to the MicroMod M.2 connector on the carrier. Below are a few options to choose for your processor:

SparkFun MicroMod ESP32 Processor

SparkFun MicroMod ESP32 Processor

SparkFun MicroMod Artemis Processor

SparkFun MicroMod Artemis Processor

SparkFun MicroMod SAMD51 Processor

SparkFun MicroMod SAMD51 Processor


You'll also need a USB-C cable to connect the Carrier Board to your computer to program your Processor and for serial USB communication. If you want to add some Qwiic breakouts to your MicroMod project you'll want at least one Qwiic cable to connect it all together. Below are some options for both of those cables:

SparkFun Qwiic Cable Kit

SparkFun Qwiic Cable Kit

Qwiic Cable - 100mm

Qwiic Cable - 100mm

Reversible USB A to C Cable - 2m

Reversible USB A to C Cable - 2m

USB 3.1 Cable A to C - 3 Foot

USB 3.1 Cable A to C - 3 Foot


Along with a Processor, the pertinent cables and sensors or other items you intend to log the data from, you'll need a microSD card. Lastly, if you would like to have your MicroMod Data Logging project be battery powered, you'll want a single-cell Lithium-ion battery. Below are a few options for both of those accessories:

Lithium Ion Battery - 2Ah

Lithium Ion Battery - 2Ah

microSD Card with Adapter - 32GB (Class 10)

microSD Card with Adapter - 32GB (Class 10)


Lithium Ion Battery - 1Ah

8 Retired

microSD Card - 16GB (Class 10)


Suggested Reading

The SparkFun MicroMod ecosystem is designed to allow users to customize their project to their needs. Do you want to send your logged data via a wireless signal (eg. Bluetooth or WiFi)? There's a MicroMod processor for that. Looking to instead maximize efficiency and processing power? You guessed it, there's a MicroMod processor for that. If you are not familiar with the SparkFun MicroMod system, take a look here:

If you aren't familiar with the MicroMod ecosystem, we recommend reading here for an overview:

MicroMod Logo
MicroMod Ecosystem

We also recommend reading through the following tutorials if you are not familiar with the concepts covered in them:

Serial Communication

Asynchronous serial communication concepts: packets, signal levels, baud rates, UARTs and more!

Serial Peripheral Interface (SPI)

SPI is commonly used to connect microcontrollers to peripherals such as sensors, shift registers, and SD cards.

SD Cards and Writing Images

How to upload images to an SD card for Raspberry Pi, PCDuino, or your favorite SBC.

Getting Started with MicroMod

Dive into the world of MicroMod - a compact interface to connect a microcontroller to various peripherals via the M.2 Connector!

Hardware Overview

In this section we'll cover the components on the MicroMod Data Logging Carrier Board, how a specific MicroMod Processor Board interacts with it and highlight a few unique features on the board.

Common Components

Most SparkFun MicroMod Carrier Boards will have some common components and all MicroMod Carrier Boards will have the keyed M.2 MicroMod Connector to plug your processor into. The photo and list below outline some of the components included on most SparkFun MicroMod Carrier Boards.

  • M.2 MicroMod Connector - This special keyed M.2 connector lets you install your MicroMod Processor Board of choice on your Carrier Board.
  • USB-C Connector - Connect to your computer to program your Processor Board and also can provide power to your MicroMod system.
  • 3.3V Regulator - Provides a regulated 3.3V and sources up to 1A.
  • Qwiic Connector - The standard Qwiic connector so you can add Qwiic devices to your MicroMod system.
  • Boot/Reset Buttons - Push buttons to enter boot mode on Processor Boards and to reset your MicroMod circuit.
  • RTC Backup Battery & Charge Circuit - 1mAh backup battery for the RTC for certain MicroMod Processor Boards . Receives charge voltage from 3.3V.
  • microSD Slot - Insert a µSD card formatted to FAT32 here to log your data.

MicroMod Data Logging Carrier Board Common Components Labeled

Power Control Circuit

The Data Logging Carrier Board features two 3.3V/600mA voltage regulators that have their Enable pins tied to I/O pins on an attached MicroMod Processor Board. This allows control of the regulators' output with a few lines of code making it extremely simple to control and conserve power in battery-powered applications. The G1-3V3 line is controlled by G1 on the MicroMod Processor and the G2-3.3V circuit is (as you may suspect) is controlled by G2 on the MicroMod Processor. The G1-3.3V power circuit is tied to several pins highlighted in the below photo for extra flexibility powering external devices. The G2-3V3 output is tied to the 3.3V pin on the Qwiic connector as well as a dedicated PTH pin labeled G2-3V3.

Photo highlighting the power control circuit and affected pins/Qwiic connector.

Battery Charging Circuit

The board also has a MCP73831 Single-Cell Lithium-Ion/Lithium-Polymer Charge IC so you can charge an attached single-cell LiPo battery. The charge IC receives power primarily from USB and can source up to 450mA to charge an attached battery.

Photo highlighting the lipo battery circuit.

Data Logging Connections

Along with the Qwiic connector mentioned in the Common Components, the Data Logging Carrier Board breaks out several other pins to connect UART, SPI and other I/O devices. The primary SPI pins are netted to the µSD slot and a PTH header near the LiPo battery connector. A second Chip Select pin tied to G0 is broken out to that same header.

Note: µSD Chip Select is tied to the SPI_CS chip select pin on the M.2 Connector. Refer to your Processor Board's documentation for information on how to properly define that pin in your code.

A UART PTH header connects to RX1 and TX1 for serial data logging and A0, A1, PWM0, PWM1, D0 and D1 are routed to dedicated PTH pins as well. Lastly, if users prefer a soldered connection instead of Qwiic, the primary I2C bus is broken out to PTH pins.

Photo highlighting the PTH pin connections.


An unpopulated JTAG footprint is available for more advanced users who need breakpoint level debugging. We recommend checking out our JTAG section for the compatible male header and a compatible JTAG programmer and debugger.

Photo highlighting JTAG connections

Solder Jumpers

If you have never worked with solder jumpers and PCB traces before or would like a quick refresher, check out our How to Work with Solder Jumpers and PCB Traces tutorial for detailed instructions and tips.

There are seven solder jumpers on the Data Logging Carrier Board labeled I2C, MEAS, BYP, VIN, 3V3, VE, and BATT. In this section we'll detail the functionality and default states of each jumper.

Jumper Name/Label Description Default State
I2C Pull-Up / I2C Pulls the Qwiic SDA/SCL lines to 3.3V via two 2.2KΩ resistors CLOSED
Measure / MEAS Open this jumper to probe the current draw at the 3.3V output of the regulator. For help measuring current, take a look at our How to Use a Multimeter tutorial. CLOSED
Bypass / BYP The "penny-in-the-fuse" jumper. Bypasses the 6V/2A fuse and nets VIN and V_USB together to allow >2A current flows. Close only if you know what you are doing! OPEN
VIN / VIN_LED Connects the 5V/VIN LED to 3.7-6V (typ. 5V from USB) via a 4.1KΩ resistor. Open to disable the VIN LED. CLOSED
3V3 / 3V3_LED Connects the 3.3V LED to 3.3V via a 1KΩ resistor. Open to disable the 3.3V LED. CLOSED
Voltage Enable / VE Close this jumper to enable processor control of the 3.3V bus. OPEN
Battery / BATT Open this jumper to measure current draw from the battery or to switch primary power from USB to battery. CLOSED
Highlighting the solder jumpers on the front of the Data Logging Carrier Board Highlighting the solder jumpers on the back of the Data Logging Carrier Board

Having trouble viewing the detail in either photo? Click on them for a larger view!

Board Dimensions

The MicroMod Data Logging Carrier Board measures 2.40" x 1.60" (60.96mm x 40.64mm) and has five mounting holes that fit a 4-40 screw. Take note of the mounting hole labeled "Qwiic Mount" above the µSD slot as it can work as single mount for a Qwiic breakout (or other sensor) or you can pair it with the outer mount in the "top-right" corner for a more secure mounting option. We demonstrate using these two mounts for a Qwiic breakout in the following section, Hardware Assembly.

Data Logging Carrier Board Dimensions

Now that we're familiar with the hardware on the MicroMod Data Logging Carrier Board, it's time to plug your Processor Board and peripheral sensors in and start logging some data. Next up we'll cover some assembly tips.

Hardware Assembly

Inserting the Processor Board

With the M.2 MicroMod connector, connecting your processor board is easy. Match up the key on your processor's beveled edge connector to the key on the M.2 connector on your Carrier Board. At a 45° angle, insert the processor board to the M.2 connector. The Processor board will stick up at an angle as seen here:

Processor Board is inserted into the M.2 connector at a 45 degree angle.

Once the board is in the socket, gently press the Processor board down, grab the set screw and tighten it with a Phillip's head screwdriver:

Securing the Processor Board into place using the set screw.

Once the Processor is secure, your assembled MicroMod system should look similar to the image below!

MicroMod Processor Board secured into place on the Data Logging Carrier Board.

Note: There is technically no way to insert the processor backward since the key prevents it from mating with the M.2 connector. As an extra safeguard to prevent inserting a processor improperly or with a poor connection, the mounting screw will not match up if the Processor is not plugged in entirely.

Data Logging Peripherals

As we mentioned previously, the Data Logging Carrier Board offers several ways to connect your sensors or other peripherals you intend to log data from.

If you are using a Qwiic breakout just connect it using a Qwiic cable to the Qwiic connector on the Carrier Board. If your I2C device is not Qwiic-enabled, you can either use a Qwiic adapter cable or connect the peripheral to the Carrier Board using the 0.1"-spaced PTH pins for I2C. Soldering is strongly recommended for this approach but if you just want a temporary connection for prototyping you can use IC Hooks like these or these.

For alternate data inputs using SPI, Serial UART or other inputs (analog, digital, etc.), you will need to connect them to the 0.1"-spaced PTH pins broken out on either side of the Data Logging Carrier Board using one of the methods covered above. Take note of which 3.3V rail you are connecting them to for easy reference when controlling power to your devices after everything is soldered together.

A Qwiic ZOE-M8Q GPS Module is connected to the Data Logging Carrier Board

Before powering everything up, insert your microSD card into the card slot and press it in to lock it into place.

Connecting Everything Up

With your processor inserted and secured it's time to connect your MicroMod Data Logging Carrier Board to your computer using the USB-C connector. Depending on which Processor you choose and which drivers you already have installed, you may need to install drivers for your processor board. Refer to your Processor Board's Hookup Guide for detailed instructions on how to install them. At this point you can also connect your battery for charging or to power the circuit once USB power is removed.

A completed GPS logging circuit with USB, Battery and GPS antenna attached.

Note: Make sure that for whichever processor you choose, you have the correct board definitions installed.

For this particular tutorial, we are using the Artemis MicroMod Processor. Board definitions for this processor board can be found in the Software Setup and Programming section of the Artemis MicroMod Processor Board Hookup Guide.

If you are using a different processor board, go to our MicroMod Processor Boards landing page, find your processor board, and head on over to that tutorial for help installing your board definition.

Arduino Examples

Note: This example assumes you are using the latest version of the Arduino IDE on your desktop. If this is your first time using Arduino, please review our tutorial on installing the Arduino IDE. If you have not previously installed an Arduino library, please check out our installation guide.

GPS Demo Circuit Example

We've written a quick example for the demo circuit from the Hardware Assembly section using the SparkFun GPS Breakout - ZEO-M8Q (Qwiic) to showcase how to log data from the GPS module to a µSD card. To assemble the circuit, simply plug in your GPS module to the Data Logging Carrier Board via a Qwiic cable and attach the GPS Antenna to the board using a u.Fl to SMA Adapter. If you've never worked with u.Fl connectors before this tutorial offers a few quick tips for using them. Also, the SparkFun u-blox Arduino library works with all of our u-blox modules so you can swap in a different u-blox GPS if you prefer.

In order to run this example you will need to have the SparkFun U-blox Arduino library installed. You can install it with the Arduino Library Manager by searching 'SparkFun u-blox GNSS' or you can download the zip here from the GitHub repository:

Copy the code below into a blank Arduino sketch, select your Processor Board (for the demo circuit we select, "SparkFun Artemis MicroMod") and the Port your board has enumerated on. If you are not using the MicroMod Artemis Processor, you'll need to adjust the define for Chip Select:

  MicroMod Data Logging Carrier Board - ZOE-M8Q GPS Example
  This example code is in the public domain.

#include <SPI.h>
#include <SD.h>
#include <Wire.h>
#include <SparkFun_u-blox_GNSS_Arduino_Library.h>

const int chipSelect = 23; // The CS pin is DATA3 or 23 for the MicroMod Artemis Processor. Adjust for your processor if necessary.

long lastTime = 0; //Simple local timer. Limits amount if I2C traffic to Ublox module.
File myFile;

void setup() {
  // Open serial communications and wait for port to open:
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  if (myGNSS.begin() == false) //Connect to the Ublox module using Wire port
    Serial.println(F("Ublox GPS not detected at default I2C address. Please check wiring. Freezing."));
    while (1);

  myGNSS.setI2COutput(COM_TYPE_UBX); //Set the I2C port to output UBX only (turn off NMEA noise)
  myGNSS.saveConfiguration(); //Save the current settings to flash and BBR

  Serial.print("Initializing SD card...");

  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    while (1);
  Serial.println("card initialized.");

  myFile = SD.open("data.txt", FILE_WRITE); // Create or open a file called "data.txt" on the SD card
    if(myFile.size() == 0)  // Only create the header if there isn't any data in the file yet
    myFile.close(); // Close the file to properly save the data
  else {
    // if the file didn't open, print an error:
    Serial.println("error opening data.txt");


void loop() 
  char gpsDate[10], gpsTime[10];
  //Query module only every 10 seconds. Adjust this value for more/less frequent GPS logs.
  if (millis() - lastTime > 10000)
    lastTime = millis(); //Update the timer
    long latitude = myGNSS.getLatitude();
    long longitude = myGNSS.getLongitude();
    long altitude = myGNSS.getAltitude();
    uint8_t fixType = myGNSS.getFixType();
    if(fixType != 0){
      myFile = SD.open("data.txt", FILE_WRITE); // Open file "data.txt"
        // Get date and time
      sprintf(gpsDate,"%d/%d/%d", myGNSS.getMonth(),myGNSS.getDay(),myGNSS.getYear());
      if(myGNSS.getSecond() < 10){
        sprintf(gpsTime,"%d/%d/0%d", myGNSS.getHour(),myGNSS.getMinute(),myGNSS.getSecond());
        sprintf(gpsTime,"%d/%d/0%d", myGNSS.getHour(),myGNSS.getMinute(),myGNSS.getSecond());
      // Save data to SD card



    else  // GPS is looking for satellites, waiting on fix
    uint8_t SIV = myGNSS.getSIV();
    Serial.print("Satellites in view: ");

With the code adjusted, click the Upload button. For debugging, open your serial monitor and set the baud 115200. The code will print out if the SD card or GPS do not initialize properly. If the SD initialization fails, check that the card is inserted and locked and that it is formatted to FAT32. If the GPS initialization fails, check the connection to your GPS board or verify it is at the default I2C address.

If everything initializes properly, the code will open the "data.txt" file and begin logging data once the GPS has a fix and will also print the same data over serial. If the GPS does not have a lock, the code will print out the number of satellites in view over serial.

Power Control Examples

In addition to this GPS example, we've written two example sketches specifically for the Data Logging Carrier Board demonstrating how to control the 3.3V regulators powering the Qwiic connector/G2-3V3 pin and G1-3V3 rail. They can be found in the MicroMod Data Logging Carrier Board GitHub Repo or you can download the Zip of the repository by clicking the button below

Take note both Qwiic and 3V3 peripheral power are controlled via the enable pin on dedicated voltage regulators. An external pull-up turns both regulators on by default but can be controlled with standard logic. Power ON = HIGH and Power OFF = LOW.


Resources and Going Further

Hopefully this guide has got you all set to get started with your own MicroMod logging project using the SparkFun MicroMod Data Logging Carrier Board. For more information about the Carrier Board, check out the resources below:

For more information on the MicroMod ecosystem, check out these resources:

Not sure where to start with your own data logging project? The tutorials below may give you some ideas to get the creative juices flowing:

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Python Programming Tutorial: Getting Started with the Raspberry Pi

This guide will show you how to write programs on your Raspberry Pi using Python to control hardware.

MicroMod Weather Carrier Board Hookup Guide

A quick guide to help to create your own MicroMod weather station using the MicroMod Weather Carrier Board and Processor of your choice.