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Products - MultiLogger

The MultiLogger allows you to store any information to a SD/uSD card in computer readable (FAT) format. It can be used alone for logging temperatures, or use the serial interface to log time-stamped data in any application. Advanced users can customize the source code to integrate other sensors/data.

$45.00 USD     Add to Cart


  • Logging local temperature changes over time
    • Log interval configurable anywhere from one second to one week)
  • Logging multiple temperature locations (up to 127 on a 3 wire cable)
  • Logging GPS data from nearly any serial GPS module
  • A serial source stream such as GPS emulation


  • SD card slot for SD or uSD (with adapter) flash card, push-in/push-out type.
  • Battery backed Real Time Clock (DS1392) for adding timestamps to logs.
    • RTC interrupt allows unit to sleep (conserve energy) and then wake up at a predetermined time/day.
  • Temperature sensor (DS18B20) for local temperature measurements
  • Polarized header allows for easy addition of up to 127 external sensors on the Dallas 1-wire bus.
  • Voltage regulation (accepts 3.5 to 16v input) onboard. Stuffing option regulator allows wider voltage range with improved efficiency and extra power for external components.
  • 3.3 to 5v tolerant serial communication. Defaults to 9600 baud (higher rates available).
  • Arduino-like architecture, using the Atmel ATmega328 running at 3.3v/16MHz.
  • FTDI Basic Breakout (5V) style serial header connector for upgrading or customizing firmware.
  • LEDs to indicate power and SD card access
  • Two more user programmable LEDS  (used to indicate SD error, and RTC pulse on provided demo app).
  • Full source code provided; customize to fit your need or use it as is.
  • Six spare microcontroller pins broken out for digital I/O or analog inputs.
  • Spare I/O, TTL serial, and power brought out to 0.100 spaced headers for prototyping, probing, or customization.
  • Five more 0.100 spaced unconnected holes available for prototype additions such as a GPS module (see below).
  • Power on/off switch to select external or USB (FTDI) power source.
  • JST connector to supply power from battery, wall-wart, etc.
  • Reset button.

               Re-programming the MultiLogger with a 5V FTDI Basic Breakout

MultiLogger Software:

  • Open source (see link below).
  • Comes loaded for stand-alone temperature logging or as a serial logger/slave from any device with 3.3-5v TTL RS-232 output.
  • Easily configurable code to set logging frequency, file name, precision, etc.
  • Write/append files with or without time stamp. File access date/time updates automatically.
  • Simple serial interactive menu can be used directly/manually, or as a slave to your device.

    Serial commands currently available:   
/?: Lists available commands
:     set File Name
        a:    append file with string
        r:     read file(arg is last X KBytes, def is 0/all)
        d:    Directory
        m:   manual temp log add
        i:     init SD Card
        t:     read rtc time
        u:    update rtc time
        c:    CD/WP bits status
            New commands added regularly, also upon request


  • Schematics (PDF)

  • MultiLogger Source code (v0.02)

  • GPS Logger code (v0.01)

  • Sleep RTC wake/log code (coming soon)

$45.00 USD     Add to Cart



Sensorium Embedded, LLC  |   Beaverton, OR  |  Contact:   |   Phone: (971) 248-0580  |   Contact us via the web