Update README

2020-06-29 15:18:53 +08:00 · 2020-06-29 15:18:53 +08:00 · b6739baa31
commit b6739baa31
--- a/README.MD
+++ b/README.MD
@ -16,6 +16,9 @@
 ## 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    |
--- a/image/SD.jpg
+++ b/image/SD.jpg