diff --git a/lambda-test/lambda-test.c b/lambda-test/lambda-test.c
index b7dfc35..4aefc00 100644
--- a/lambda-test/lambda-test.c
+++ b/lambda-test/lambda-test.c
@@ -41,7 +41,7 @@
 bool testSetupPorts(void) {
 	setupPorts();
 
-	// test that pull-up resistor for the mouton is enabled
+	// test that the pull-up resistor for the mouton is enabled
 	assertTrue(bit_is_set(PORTB, PB0));
 
 	return true;
diff --git a/lambda/interrupts.c b/lambda/interrupts.c
index a182ce1..c45d7ac 100644
--- a/lambda/interrupts.c
+++ b/lambda/interrupts.c
@@ -11,6 +11,7 @@
 
 void setupPorts(void) {
 	// pull-up resistor for the mouton
+	// INT0 and INT1 are assigned to the LCD, a bit of a shame
 	PORTB |= (1 << PB0);
 
 	// PB1 as output
diff --git a/lambda/lcdroutines.h b/lambda/lcdroutines.h
index 18b29be..e362a56 100644
--- a/lambda/lcdroutines.h
+++ b/lambda/lcdroutines.h
@@ -18,12 +18,12 @@
 
 #define LCD_PORT PORTD
 #define LCD_DDR	 DDRD
-#define LCD_RS   PD6
-#define LCD_EN   PD7
-#define LCD_DB4  PD5
-#define LCD_DB5  PD2
-#define LCD_DB6  PD3
-#define LCD_DB7  PD4
+#define LCD_RS   PD6 // PD7 on diagram
+#define LCD_EN   PD7 // PD6 on diagram
+#define LCD_DB4  PD5 // PD5 on diagram
+#define LCD_DB5  PD2 // PD4 on diagram
+#define LCD_DB6  PD3 // PD3 on diagram
+#define LCD_DB7  PD4 // PD2 on diagram
  
 ////////////////////////////////////////////////////////////////////////////////
 // LCD Ausführungszeiten (MS=Millisekunden, US=Mikrosekunden)
diff --git a/lambda/sensors.c b/lambda/sensors.c
index 15554ff..ae0038d 100644
--- a/lambda/sensors.c
+++ b/lambda/sensors.c
@@ -57,7 +57,7 @@
 };
 
 /**
- * Global variables holding averaged voltages.
+ * Variables holding averaged voltages.
  */
 uint32_t lambdaVoltageAvg = 44 << 3; // Lambda 2.00
 uint32_t tempIVoltageAvg = 100 << 3; // 20°C
@@ -68,15 +68,15 @@
  * calculates an exponential moving average and displays the translated values.
  */
 measurement measure(void) {
-	uint32_t tempIVoltage = getVoltage(PC5);
+	uint32_t tempIVoltage = getVoltage(ADC_TEMPI);
 	tempIVoltageAvg = tempIVoltage + tempIVoltageAvg -
 			((tempIVoltageAvg - 4) >> 3);
 
-	uint32_t tempOVoltage = getVoltage(PC0);
+	uint32_t tempOVoltage = getVoltage(ADC_TEMPO);
 	tempOVoltageAvg = tempOVoltage + tempOVoltageAvg -
 			((tempOVoltageAvg - 4) >> 3);
 
-	uint32_t lambdaVoltage = getVoltage(PC2);
+	uint32_t lambdaVoltage = getVoltage(ADC_LAMBDA);
 	lambdaVoltageAvg = lambdaVoltage + lambdaVoltageAvg -
 			((lambdaVoltageAvg - 4) >> 3);
 
diff --git a/lambda/sensors.h b/lambda/sensors.h
index fa53989..52a9b83 100644
--- a/lambda/sensors.h
+++ b/lambda/sensors.h
@@ -18,6 +18,10 @@
 #define IDEAL "Ideal"
 #define RICH "Fett!"
 
+#define ADC_TEMPI PC5  // PC5 on diagram
+#define ADC_TEMPO PC0  // PC4 on diagram
+#define ADC_LAMBDA PC2 // PC3 on diagram
+
 /**
  * Entry for the lookup tables.
  */