SKU: 79647313667

OpenLog

Sale price$15.75 Regular price$17.50
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Ships within 48 hours · Estimated delivery Jul 16 - Jul 21

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Description

OpenLogOpenLog is an open source data logger. Simple to use, simple to change. We wanted to create a serial logger that just worked. Power this device up and it will start logging any received serial data at 9600bps. Sending Ctrl+z 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

OpenLog is an open source data logger. Simple to use, simple to change. We wanted to create a serial logger that just worked. Power this device up and it will start logging any received serial data at 9600bps. Sending Ctrl+z 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


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.

Features

  • Log to low-cost microSD cards up to 2GB
  • Simple command interface
  • 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)
  • Doesn't drop characters even at full-blast 115200bps
  • 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
  • 8mA idle, 18mA 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.

Shipping Notes
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Exchange/Return Notes
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SKU: 79647313667

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Mr. Jibby
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★★★★★ 4
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Reviewed in the United States on April 28, 2025
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★★★★★ 5
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Saved me when tried to change the oil. Great price
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Reviewed in the United States on May 23, 2026
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Reynaldo medina
West Palm Beach, US
★★★★★ 5
Un buen precio
Color: Silver
Quedó bien
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Reviewed in the United States on March 20, 2026
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babak abbaspour
Omaha, US
★★★★★ 1
Not as described does not fit
Color: Silver
Not as described does not fit no good
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Reviewed in the United States on May 3, 2026
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CMAUSA
New York, US
★★★★★ 4
Do one oil change myself and it’s more than paid for.
Color: Silver, Color: Silver
It is 74 mm. It’s nicely made of cast aluminum. It has a rough cast finish so it shouldn’t be difficult to hold on to. It does fit my Lexus filter and the price is very reasonable. It also fits the oil filter on my 1999 (antique) Harley Davidson Heritage Classic. Which is the primary reason I ordered it. I don’t know this for certain but I suspect it will fit all HD EVO engines. That would be 1984 through 1998 except the Heritage which didn’t change to the 88 Twin Cam until 2000.
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Reviewed in the United States on December 18, 2025

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