The official location and documentation for this library is: https://github.com/rickkas7/SdCardLogHandlerRK . It’s in the Particle community libraries as: SdCardLogHandlerRK. You’ll need a SD card reader, presumably a Micro SD card reader. Make sure you get one that’s compatible with the 3.3V logic…

On the SdCardPrintHandler (or SdCardLogHandler) object, call, for example: if (printToCard.getLastBeginResult()) { // Card is present }

There was no datasheet but this is where I purchased the SD card from: [image] <a href="https://www.banggood.com/3Pcs-RobotDyn-Micro-SD-Card-High-Speed-Module-For-3_3V-5V-Logic-For-MicroSD-MMC-Card-p-1255779.html?gmcCountry=ZA&currency=ZAR&createTmp=1&utm_source=googleshopping&utm_medium=cpc_bgs&utm_content=frank&utm_campaign=ssc-za-all-0219&ad_id=332639730198&gclid=EAIaIQobChMI5fue1dj64AIVjZXtCh1O9AifEAQYASABEgJ4XfD_BwE&cur_warehouse=CN" target="_blank" rel="nofollow noopener">R84.52 3Pcs RobotDyn® Micro SD Card High Speed Module For 3.3V 5V Logic For... Online Shopping at Banggood.com！

Thanks @rickkas7 i will give this a try

[image] Alli: Unfortunately for me, the module appears not to have such a pin. I think you are mistaken. Look at the image shown on the site you linked to [image] Markt the description of the CD pin!

Apologies @ScruffR . i posted the wrong link. This is the one i have ordered now. The link below is the one i am prototyping with that does not have the card detect pin: https://www.diyelectronics.co.za/store/memory/512-micro-sd-card-module.html Thank you @ScruffR ScruffR

@rickkas7 Should there be any concern with having two different SdCardLogHandlers (writing to two different directories) and reading/writing other files on the SD card (and a serial log handler)? I’ve written a test program and it seems to be stable (so far). The only caveat being: You must writ…

@rickkas7 @prtclusr I’m hoping you can give me some help with writing data to an SD card. Most recently I tried the code @prtclusr posted but with the same result; nothing appears to get written to the SD card. We are using a custom printed circuit board with a Particle E-Series board added to it. W…

What did you connect the second USB port to on the E Series module? The u-blox USB port pins? That definitely will not work. That’s directly connected to the modem and is not accessible to user firmware. The SDFAT library is meant to use an SPI-connected SD card adapter. It will definitely not work…

@rickkas7 Thank you for the response! As far as I am aware, yes, the second USB port is connected to the u-blox USB port pins. I will double check with the person who designed the board, but I’m about 90% positive that’s what happened.

@rickkas7 Okay, I checked with the designer and he said that the second USB port is NOT connected to the u-blox USB port pins. However, the two USB ports are exactly the same. He was aware that while using one of the ports the other could not be used because they are the same. We are going to see i…

Library for logging to SD card: SdCardLogHandlerRK

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Library for logging to SD card: SdCardLogHandlerRK

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