SD card reader hardware compatible with Picaxe

[charles_platt]

Can anyone recommend a compatible card reader/writer that really works with Picaxe? Long ago I bought one from an Australian source, but its write cycle time increased with each byte of data stored on the card, until writing one byte took a couple of seconds. So ... it was not practical.

 

[steliosm]

Although I never used it, I read good reviews in the past: Sparkfun Openlog Data Logger.

 

[charles_platt]

Although I never used it, I read good reviews in the past: Sparkfun Openlog Data Logger.

Thanks, I'll check it out.

 

[charles_platt]

This looks interesting. Has anyone tried it? I like the idea of the microcontroller receiving sensor input, doing analog-digital conversion, and sending simple serial data to the logger, but how it creates a filename on the SD card, I cannot imagine.

https://www.amazon.com/gp/product/B0CSDLXZF6/ref=sw_img_1

 

[steliosm]

It's pretty much what the OpenLogger does. You send serial commands to create filenames and store data in it. The filesystem on the SD card is compatible with a PC, so you can review/copy the data accross.

Here is the list of commands for OpenLog: https://learn.sparkfun.com/tutorials/openlog-hookup-guide/command-set

 

[johnlong]

I have used the uSD data logger for many years the only problem with it if you remove the card when it is powered when replacing it you have to reboot it a pain got around this by putting a PNP transistor on the V+ connected to a spare pin to control the voltage for writing once a day or what ever you wish. Jeremery Harris did a lot of work on this unit which can be found on this site at

Environmental uSD card data logger​

 

[charles_platt]

Thank you very much John.