diff --git a/note.txt b/note.txt
new file mode 100644
index 0000000..94da7fe
--- /dev/null
+++ b/note.txt
@@ -0,0 +1,14 @@
+- POE
+-wiznet w5500
+- pzem-017
+-pzem-004t
+
+
+	esp	|	rs485	|	pzem-017
+----------------------------------------------------------------------------------------------------------------------------
+	5v	|	vcc	|	5v
+	gnd	|	gnd	|	gnd
+	gpio17	|	txd	|	
+	gpio16	|	rxd	|	
+		|	a+	|	a
+		|	b-	|	b
\ No newline at end of file