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I am bit tired of using Serial as logger - mainly for two reasons: it does not support sprintf syntax and string are being held in RAM. For this reason I've implemented new library: https://github.com/maciejmiklas/ArdLog

ArdLog serves as simple logger for Arduino that creates formatted messages over Serial:

  • Each message has timestamp.
  • Each message within single loop has the same timestamp, so that you can logically connect activities together.
  • Messages can be formatted using sprintf syntax.
  • Text for the messages is being held in PROGMEM.

Step 1: Installation

In order to install ArdLog you have to download desired release and unpack in into folder containing Arduino libraries. The is the result on MacOS:

$ pwd
/Users/fred/Documents/Arduino/libraries/ArdLog

$ ls ArdLog.cpp ArdLog.h LICENSE README.md

Step 2: Configuration

  • Logger is disabled by default, in order to enable it set LOG to true.
  • Messages are created over default Serial port.
  • You can choose alternative port by setting: USE_SERIAL_1, USE_SERIAL_2 or USE_SERIAL_3 to true.
  • In order to print current time for each message set USE_CURRENT_TIME to true. By default logger will sample time only once at the beginning of each loop.

Step 3: Getting Up and Running

  1. Choose suitable configuration in ArdLog.h. In most cases you have to only set LOG to true.
  2. Call log_setup() in setup() method - this will initialize serial port.
  3. Call log_cycle() at the beginning of each loop() - it will sample current time.
  4. Put log messages into #if LOG log(F("....") #endif - once logger is disabled, it will not waste RAM and CUP.

This is output created by example above:

>>[000-00:00:00,000]-> Logger initialized, free RAM: 1537

>>[000-00:00:00,003]-> Free RAM: 1527

>>[000-00:00:00,003]-> **** Loop 1 ****

>>[000-00:00:00,003]-> T1 = 9

>>[000-00:00:00,003]-> T2 = 112

>>[000-00:00:01,113]-> **** Loop 2 ****

>>[000-00:00:01,113]-> T1 = 1114

>>[000-00:00:01,113]-> T2 = 1215

>>[000-00:00:02,215]-> **** Loop 3 ****

>>[000-00:00:02,215]-> T1 = 2217

>>[000-00:00:02,215]-> T2 = 2318

>>[000-00:00:03,319]-> **** Loop 4 ****

>>[000-00:00:03,319]-> T1 = 3320

>>[000-00:00:03,319]-> T2 = 3421

>>[000-00:00:04,422]-> **** Loop 5 ****

>>[000-00:00:04,422]-> T1 = 4423

>>[000-00:00:04,422]-> T2 = 4525

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