Update README

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lewis he 2020-06-29 15:18:53 +08:00
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## 3.Board choose
- The board can choose `ESP32 Dev Module`, other settings can keep the default
## 4. SD card connection
- Demonstrate how to use the second SPI device, using the SD card as a demonstration device
![](image/SD.jpg)
## Pinout
| Name | V18 |

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