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SFE Widgets

Sparkfun Widgets


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  1. Logomatic Serial SD Datalogger

    Logomatic Serial SD Datalogger


    The Lassen iQ Datalogger has been a tremendous hit, but we listened when our customers asked for more flexibility. The Logomatic has the ability to record not just Lassen iQ data, but any serial data! Now you can record for weeks with any size SD card up to 1gig (we are still testing the 2gig cards).

    With a little firmware tweaking, you can even run analog-to-digital conversion on the various ADC input and record them.

    Recording frequency, serial data rate (variable from 2400bps to 115200bps), and other various firmware settings are configurable via a settings.txt file on the SD card. It's as simple as editing the text file on the SD card from your computer, then inserting the SD card into the Log-O-Matic, and powering up the unit!

    NOTE: Supply voltage should be kept between 3.6V and 7.5V.


    Software: Logomatic V02, Learn More
  2. USB Weather Board

    USB Weather Board


    We take the sensitive SCP1000 barometric pressure sensor, match it with a sensitive SHT15 humidity sensor, and we give you weather over USB! Ok, so it doesn't really predict the weather, but you can immediately tell what the current pressure, humidity, and temperature is. Graphed over time you can watch weather fronts move in and the rain come down.

    Serial output is a single visible ASCII string at 9600bps.

    There is a footprint and switch for 'RF'. This unit can be powered from our large solar cell and data can be transmitted via our BlueSMiRF wireless modem! All you need now is a greenhouse to monitor.

    • Powered over USB or externally
    • Absolute barometric pressure accurate within +/-150 Pascal
    • Relative humidity accurate within +/-2%
    • Temperature accurate within +/-0.3 degrees C
    • Serial output 9600bps 8-N-1
    • Measurement rate of 1Hz
    Learn More
  3. Real Time Clock Module

    Real Time Clock Module


    Out of stock

    This a custom designed module for the DS1307 Real Time Clock. The module comes fully assembled and pre-programmed with the current time (ok, so it's our current time - MST). The included Lithium coin cell battery (CR1225 41mAh) will run the module for a minimum of 9 years (17 years typical) without external 5V power. The DS1307 is accessed via the I2C protocol. We've written a test-bed to program the modules. This test-bed code should give you some insight on how to interface the module to any mircocontroller using our example software I2C and BCD routines.


    • Two wire I2C interface
    • Hour : Minutes : Seconds AM/PM
    • Day Month, Date - Year
    • Leap year compensation
    • Accurate calendar up to year 2100
    • Battery backup included
    • 1Hz output pin
    • 56 Bytes of Non-volatile memory available to user

    Dimensions: 0.75x0.75" (20x20mm)

    Software: Example 16F88 code

    Learn More
  4. Logomatic v2 Serial SD Datalogger

    Logomatic v2 Serial SD Datalogger


    The Logomatic v2 takes everything we learned with multiple logging projects over the years and boils it down to an easy to use device, that is now more adaptable than ever! Version 2 incorporates the LPC2148 with USB, battery charging, and microSD support. This allows us to use the SparkFun LPC2148 USB bootloader for even easier and faster modification of the firmware. No programmer required!

    The Logomatic v2 uses a USB mass storage stack to appear under any operating system as a flash drive. Logs are created in FAT16 format on the micro-SD media and can be downloaded quickly over a USB connection by dragging and dropping the text files from the device. The microSD card can also be removed and inserted into a card reader to download the logs.

    Board comes with a JST connector to be powered from our line-up of LiPo batteries or other power sources up to 7.5VDC. If you choose to use LiPo batteries, the Logomatic v2 has a built-in charger to charge batteries off USB.

    The Logomatic v2 ships with basic serial text and analog logging. Users can easily start with this firmware but are encouraged to modify the firmware for their specific requirements. It's a truly flexible logger. Learn More
  5. OpenLog



    OpenLog is an open source data logger. Simple to use, simple to change. We wanted to create a serial logger that just worked. Power up this device and it will start logging any received serial data at 9600bps. Sending Ctrl+z three times will drop out of logging and in to command mode. 'new' will create a new file. 'md' makes a directory. '?' brings up the list of commands. OpenLog doesn't do a lot, but it does log serial streams extremely well. Example:
    >new testfile.txt
    >append testfile.txt
    <(send large amounts of text followed by three ctrl+z characters)

    That's really it! OpenLog firmware is open source and is based on Roland Riegel's FAT library. OpenLog currently supports FAT16 (upto 2GB microSD cards). We're working on FAT32 and would love your help!

    All the design files (schematic, PCB layout, firmware) are open source released under the CC-SA v3 license and are available through GitHub.


    • Log to low-cost microSD cards up to 2GB
    • Simple command interface
    • Edit CONFIG.txt file from a computer to change baud rate and other system settings
    • Three modes:
      • NewLog creates a new log every power up and immediately starts logging
      • SeqLog appends a file called "SeqLog.txt" at every power up and immediately starts logging
      • Command mode starts OpenLog at a command prompt at power up
    • Configurable baud rates (2400 to 115200bps)
    • Configure unit through config file or the menu system
    • Doesn't drop characters even at full-blast 57600bps
    • Power, ground, and RX-I are the minimum connections
    • Reprogrammable ATmega328 using the standard STK500 serial bootloader
    • Two LEDs indicate writing status
    • Input voltage from 3.3V to 12V
    • 2mA idle, 6mA at maximum recording rate
    Dimensions: 0.16 x 0.6 x 0.75" (4 x 15 x 19mm)

    Documents: The OpenLog project is housed on GitHub! Please see the wiki for the most up-to-date firmware, feature requests, files, and datasheet specs.
    Learn More


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