make reset pin optional

Author: thijstriemstra

MultiPlexer_MCP23017/MultiPlexer_MCP23017.cpp

@@ -5,7 +5,11 @@
 #include "MultiPlexer_MCP23017.h"
 
 MultiPlexer_MCP23017::MultiPlexer_MCP23017(int reset_pin, int i2c_addr) {
-  _mcp = new MCP23017(i2c_addr, reset_pin);
+  if (reset_pin == -1) {
+    _mcp = new MCP23017(i2c_addr);
+  } else {
+    _mcp = new MCP23017(i2c_addr, reset_pin);
+  }
 }
 
 void MultiPlexer_MCP23017::begin() {

MultiPlexer_MCP23017/MultiPlexer_MCP23017.h

@@ -11,7 +11,7 @@ class MultiPlexer_MCP23017
 {
   public:
     MultiPlexer_MCP23017(
-      int reset_pin = 5,
+      int reset_pin = -1,
       int i2c_addr = 0x20
     );
     void begin();