diff --git a/libraries/MySensors/core/MyHw.h b/libraries/MySensors/core/MyHw.h
index 6d8571c..5185b79 100644
--- a/libraries/MySensors/core/MyHw.h
+++ b/libraries/MySensors/core/MyHw.h
@@ -45,8 +45,7 @@ uint8_t hwReadConfig(int adr);
 int8_t hwSleep(unsigned long ms);
 int8_t hwSleep(uint8_t interrupt, uint8_t mode, unsigned long ms);
 int8_t hwSleep(uint8_t interrupt1, uint8_t mode1, uint8_t interrupt2, uint8_t mode2, unsigned long ms);
-uint16_t hwCPUVoltage(); 
-uint16_t hwCPUFrequency(); 
+
 #ifdef MY_DEBUG
 	void hwDebugPrint(const char *fmt, ... );
 #endif
diff --git a/libraries/MySensors/core/MyHwATMega328.cpp b/libraries/MySensors/core/MyHwATMega328.cpp
index f4a1585..10e03ec 100644
--- a/libraries/MySensors/core/MyHwATMega328.cpp
+++ b/libraries/MySensors/core/MyHwATMega328.cpp
@@ -152,7 +152,7 @@ uint16_t hwCPUVoltage() {
 	return (1125300UL) / ADC;
 }
 
-uint16_t hwCPUFrequency() {
+uint8_t hwCPUFrequency() {
 	noInterrupts();
 	// setup timer1
 	TIFR1 = 0xFF;   
diff --git a/libraries/MySensors/core/MyHwESP8266.cpp b/libraries/MySensors/core/MyHwESP8266.cpp
index 9134612..c9568a1 100644
--- a/libraries/MySensors/core/MyHwESP8266.cpp
+++ b/libraries/MySensors/core/MyHwESP8266.cpp
@@ -113,7 +113,7 @@ uint16_t hwCPUVoltage() {
 	return ESP.getVcc();
 }
 
-uint16_t hwCPUFrequency() {
+uint8_t hwCPUFrequency() {
 	return ESP.getCpuFreqMHz();
 }
 
diff --git a/libraries/MySensors/core/MyHwSAMD.cpp b/libraries/MySensors/core/MyHwSAMD.cpp
index effc00b..8fda54f 100644
--- a/libraries/MySensors/core/MyHwSAMD.cpp
+++ b/libraries/MySensors/core/MyHwSAMD.cpp
@@ -135,16 +135,6 @@ int8_t hwSleep(uint8_t interrupt1, uint8_t mode1, uint8_t interrupt2, uint8_t mo
   return -2;
 }
 
-uint16_t hwCPUVoltage() {
-	// TODO: not supported
-	return 0;
-}
-
-uint16_t hwCPUFrequency() {
-	// TODO: not supported
-	return 0;
-}
-
 #ifdef MY_DEBUG
 void hwDebugPrint(const char *fmt, ... ) {
 	char fmtBuffer[300];