NodeMCU.md

@@ -37,3 +37,13 @@ The term "NodeMCU" by default refers to the firmware rather than the dev kits. T
 |Programming Languages|C++ / Python / Lua / Javascript|C++|C++|
 |Flashing|Locally / OTA|Locally / OTA|Over the Web IDE / OTA|
 |Cost|$4.30|$32|$19|
+
+### ESP8266 vs ATMega328 (Arduino UNO, Nano, Pro Mini)
+
+| | ESP8266 | ATMega328 |
+|---|---|---|
+|Operating Voltage|3.3v|3.3v or 5v|
+|Clock Speed|80-160 MHz|16 MHz|
+|Flash Memory|External (512Kb-4MB)|Internal (32Kb)|
+|Digital I/O Pins|10|22|
+|PWM Output|10|6|
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