diff --git a/IODevice.cpp b/IODevice.cpp
index 0f833e8..d49eedc 100644
--- a/IODevice.cpp
+++ b/IODevice.cpp
@@ -261,7 +261,7 @@ bool IODevice::owns(VPIN id) {
 // } 
 
 // Read value from virtual pin.
-bool IODevice::read(VPIN vpin) {
+int IODevice::read(VPIN vpin) {
   for (IODevice *dev = _firstDevice; dev != 0; dev = dev->_nextDevice) {
     if (dev->owns(vpin)) 
       return dev->_read(vpin);
@@ -302,7 +302,7 @@ bool IODevice::hasCallback(VPIN vpin) {
   (void)vpin;  // Avoid compiler warnings
   return false; 
 }
-bool IODevice::read(VPIN vpin) { 
+int IODevice::read(VPIN vpin) { 
   pinMode(vpin, INPUT_PULLUP);
   return !digitalRead(vpin);  // Return inverted state (5v=0, 0v=1)
 }
diff --git a/IODevice.h b/IODevice.h
index eda76ab..ca16285 100644
--- a/IODevice.h
+++ b/IODevice.h
@@ -102,7 +102,7 @@ public:
   static bool hasCallback(VPIN vpin);
 
   // read invokes the IODevice instance's _read method.
-  static bool read(VPIN vpin);
+  static int read(VPIN vpin);
 
   // loop invokes the IODevice instance's _loop method.
   static void loop();
@@ -348,4 +348,4 @@ private:
 // #include "IO_MCP23017.h"
 // #include "IO_PCF8574.h"
 
-#endif // iodevice_h
+#endif // iodevice_h
\ No newline at end of file