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Let´s see, when I want to spend time on this again. Ok, I could now fiddle somewhere betweein 4000, but I doubt this will be worth the effort before I test with the real measurement of RPM, voltage and current…. In my current test setup 40000 seems to be the best option here I most often get 0 overruns. In the detail of the first phase it shows only little more detail than the measurement in example 1.ĭepending on the SD card and hardware you are using, you need to experiment with the sample rate and need to decide, how many overruns you can accept. We can also see large gaps over the whole duration of the measurement. Here you can see that the number of overruns dramatically increases and the number of samples is even lower than with the lower sample rate in example 1. Measurements with the Arduino FastLoggerĮxample 1, Sample interval 25.00µs: ADC Volt is the ADC reading, ie 0-1024 (but as my calibration isn´t correct anyway…this is only for illustration)

Here we see the voltage jump, which takes about 80µs according to the scope.

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Next I changed to full ADC 16Bit logging.errr…10 Bit on a 328p 😉īefore coming to the examples, let´s start with the reference, the voltage as recorded with the oszilloscope: First guess: with the new approach I could achieve an improvement by a factor of 46 – further ADC and digital PIN reading not yet considered. In my previous tests I wrote micros(), voltage, pulse width and current to the SD, which was around a factor 8 of data. This is a factor 375 better than before, but so far I only wrote the voltage measurement and micros()%256 as timestamp. My first measurements showed a sampling rate of about 62,5k samples per second (one sample every 16µs). In the worst case we can revert to any previous version thanks to the cloud :o)Īs this document is stored under my account google I hereby reserve all rights to remove any inappropriate, abusive or whatsoever unhelpful stuff that may come in but of course the technical content remains owned by the community.”Īs all my previous attempts only lead to one sample per 5milliseconds on average, I started to try the library and example from fat16lib, you can find this library here: New fast data logging sketches

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Let´s see how this works, it´s also the first public worldwide community document editing for meĪnd everyone please feel free to edit, modify, restructure whatever you want in this document. Maybe over time we can identify some named editors keeping the edit access and everyone else can only comment. As soon as we collaboratively decide, that it`s kind of ready for the wiki, we can copy or link it there. “pls have a first look, put your comments in that and then we can decide to create a (sticky?) post in Arduino:Storage to promote this document and the ongoing work on it.

I started a google document to give some overview on ways to troubleshoot SD card usage with Arduino.

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