diff --git a/examples/PCF8574_Wire2/PCF8574_Wire2.ino b/examples/PCF8574_Wire2/PCF8574_Wire2.ino
index f595374..3013269 100644
--- a/examples/PCF8574_Wire2/PCF8574_Wire2.ino
+++ b/examples/PCF8574_Wire2/PCF8574_Wire2.ino
@@ -2,7 +2,7 @@
 //    FILE: PCF8574_Wire2.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2016-04-30
-// PUPROSE: demo
+// PURPOSE: demo
 
 
 #include "PCF8574.h"
diff --git a/examples/PCF8574_rotaryEncoder/PCF8574_rotaryEncoder.ino b/examples/PCF8574_rotaryEncoder/PCF8574_rotaryEncoder.ino
index f6f3a5d..2051b3e 100644
--- a/examples/PCF8574_rotaryEncoder/PCF8574_rotaryEncoder.ino
+++ b/examples/PCF8574_rotaryEncoder/PCF8574_rotaryEncoder.ino
@@ -2,7 +2,7 @@
 //    FILE: PCF8574_rotaryEncoder.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2021-05-08
-// PUPROSE: demo PCF8574 as rotary encoder reader.
+// PURPOSE: demo PCF8574 as rotary encoder reader.
 //
 //
 //  RotaryEncoder    PCF8574      UNO
diff --git a/examples/PCF8574_test1/PCF8574_test1.ino b/examples/PCF8574_test1/PCF8574_test1.ino
index 570f5ae..b66a548 100644
--- a/examples/PCF8574_test1/PCF8574_test1.ino
+++ b/examples/PCF8574_test1/PCF8574_test1.ino
@@ -2,7 +2,7 @@
 //    FILE: PCF8574_test.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 27-08-2013
-// PUPROSE: demo
+// PURPOSE: demo
 
 
 #include "PCF8574.h"
diff --git a/examples/PCF8574_test2/PCF8574_test2.ino b/examples/PCF8574_test2/PCF8574_test2.ino
index 6cc67af..fee99dc 100644
--- a/examples/PCF8574_test2/PCF8574_test2.ino
+++ b/examples/PCF8574_test2/PCF8574_test2.ino
@@ -2,7 +2,7 @@
 //    FILE: pcf8574_test2.ino
 //  AUTHOR: Rob Tillaart
 //    DATE: 2016-04-30
-// PUPROSE: demo rotateLeft, rotateRight and toggleMask
+// PURPOSE: demo rotateLeft, rotateRight and toggleMask
 
 
 #include "PCF8574.h"
diff --git a/examples/PCF8574_test_ESP32/PCF8574_test_ESP32.ino b/examples/PCF8574_test_ESP32/PCF8574_test_ESP32.ino
index 52e4038..acf7d62 100644
--- a/examples/PCF8574_test_ESP32/PCF8574_test_ESP32.ino
+++ b/examples/PCF8574_test_ESP32/PCF8574_test_ESP32.ino
@@ -17,10 +17,10 @@ void setup()
   Serial.print("PCF8574_LIB_VERSION:\t");
   Serial.println(PCF8574_LIB_VERSION);
 
-  Wire.begin();
-
   //  adjust pins if needed
-  PCF_01.begin(20, 21);
+  Wire.begin(20, 21);
+
+  PCF_01.begin();
 
   int x = PCF_01.read8();
   Serial.print("Read ");
diff --git a/test/unit_test_001.cpp b/test/unit_test_001.cpp
index 2bfb795..79116b4 100644
--- a/test/unit_test_001.cpp
+++ b/test/unit_test_001.cpp
@@ -94,7 +94,7 @@ unittest(test_address)
 {
   PCF8574 PCF(0x38);
 
-  Wire.begin
+  Wire.begin();
 
   //  incorrect in test environment.
   assertTrue(PCF.begin());