diff --git a/libraries/CMSIS_DSP/examples/arm_sin_cos_example_f32/arm_sin_cos_example_f32.ino b/libraries/CMSIS_DSP/examples/arm_sin_cos_example_f32/arm_sin_cos_example_f32.ino
index 418836f973..d4d3203720 100644
--- a/libraries/CMSIS_DSP/examples/arm_sin_cos_example_f32/arm_sin_cos_example_f32.ino
+++ b/libraries/CMSIS_DSP/examples/arm_sin_cos_example_f32/arm_sin_cos_example_f32.ino
@@ -47,12 +47,12 @@
 
    \par Description:
    \par
-   Demonstrates the Pythagorean trignometric identity with the use of Cosine, Sine, Vector
+   Demonstrates the Pythagorean trigonometric identity with the use of Cosine, Sine, Vector
    Multiplication, and Vector Addition functions.
 
    \par Algorithm:
    \par
-   Mathematically, the Pythagorean trignometric identity is defined by the following equation:
+   Mathematically, the Pythagorean trigonometric identity is defined by the following equation:
     <pre>sin(x) * sin(x) + cos(x) * cos(x) = 1</pre>
    where \c x is the angle in radians.
 
diff --git a/libraries/SoftwareSerial/src/SoftwareSerial.cpp b/libraries/SoftwareSerial/src/SoftwareSerial.cpp
index 9eec770a6a..6a8c303c6c 100644
--- a/libraries/SoftwareSerial/src/SoftwareSerial.cpp
+++ b/libraries/SoftwareSerial/src/SoftwareSerial.cpp
@@ -283,7 +283,7 @@ inline void SoftwareSerial::recv()
       if (inbit) {
         rx_buffer |= 0x80;
       }
-      rx_bit_cnt++; // Preprare for next bit
+      rx_bit_cnt++; // Prepare for next bit
       rx_tick_cnt = OVERSAMPLE; // Wait OVERSAMPLE ticks before sampling next bit
     }
   }
diff --git a/libraries/SrcWrapper/src/stm32/uart.c b/libraries/SrcWrapper/src/stm32/uart.c
index f1ea4bc275..3f90dcfe72 100644
--- a/libraries/SrcWrapper/src/stm32/uart.c
+++ b/libraries/SrcWrapper/src/stm32/uart.c
@@ -36,7 +36,7 @@ extern "C" {
 #define DEBUG_UART_BAUDRATE 9600
 #endif
 
-/* @brief uart caracteristics */
+/* @brief uart characteristics */
 typedef enum {
 #if defined(USART1_BASE)
   UART1_INDEX,
diff --git a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino
index 3e503a8cae..22a138c79b 100644
--- a/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino
+++ b/libraries/Wire/examples/i2c_scanner/i2c_scanner.ino
@@ -6,7 +6,7 @@
 //    can be found in many places.
 //    For example on the Arduino.cc forum.
 //    The original author is not know.
-// Version 2, Juni 2012, Using Arduino 1.0.1
+// Version 2, Jun 2012, Using Arduino 1.0.1
 //     Adapted to be as simple as possible by Arduino.cc user Krodal
 // Version 3, Feb 26  2013
 //    V3 by louarnold
@@ -47,7 +47,7 @@
  If you want to use the two I2Cs simultaneously, create a new instance for the second I2C
   TwoWire Wire2(PB11,PB10);
   Wire2.begin();
- 
+
 */
 
 
@@ -76,10 +76,10 @@ void loop() {
 
     Wire.beginTransmission(address);
     error = Wire.endTransmission();
-    
+
     if (error == 0) {
       Serial.print("I2C device found at address 0x");
-      if (address < 16) 
+      if (address < 16)
         Serial.print("0");
       Serial.println(address, HEX);
 
@@ -87,10 +87,10 @@ void loop() {
     }
     else if (error == 4) {
       Serial.print("Unknown error at address 0x");
-      if (address < 16) 
+      if (address < 16)
         Serial.print("0");
       Serial.println(address, HEX);
-    }    
+    }
   }
   if (nDevices == 0)
     Serial.println("No I2C devices found");