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SD library explanation (#262)

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It's look more a practical guide "how to use SD lib"
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copercini 2017-03-14 10:53:59 -03:00 committed by Me No Dev
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# SD library
This library provides the integration of ESP32 and SD (Secure Digital) cards without additional modules.
## Sample wiring diagram:
![SD card pins](http://i.imgur.com/4CoXOuR.png)
For others SD formats:
![Other SD card formats](https://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/MMC-SD-miniSD-microSD-Color-Numbers-Names.gif/330px-MMC-SD-miniSD-microSD-Color-Numbers-Names.gif)
Image source: [Wikipedia](https://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/MMC-SD-miniSD-microSD-Color-Numbers-Names.gif/330px-MMC-SD-miniSD-microSD-Color-Numbers-Names.gif)
```diff
- Warning: Some ESP32 modules have different pinouts!
```
## FAQ:
**Do I need any additional modules, like Arduino SD module?**
No, just wire your SD card directly to ESP32.
**What is the difference between SD and SD_MMC libraries?**
SD runs on SPI, and SD_MMC uses the SDMMC hardware bus on the ESP32.
**Can I change the CS pin?**
Yes, just use: `SD.begin(CSpin)`