Add hint (#170)

* Add hint * Update README.md * Update README.md * Update README.md

Add hint (#170)
* Add hint * Update README.md * Update README.md * Update README.md
150d2cec · Ion · Me No Dev · 97e9a120 · 150d2cec
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README.md README.md +5 -0

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--- a/README.md
+++ b/README.md
@@ -136,3 +136,8 @@ Using make instead of the Arduino IDE makes it easier to do automated and produc
 ## ESP32Dev Board PINMAP

 ![Pin Functions](doc/esp32_pinmap.png)
+
+## Hint
+
+Sometimes to program ESP32 via serial you must keep GPIO0 LOW during the programming process
+