Merge pull request #4 from FrankBoesing/patch-1

Add PCF8574

examples/Scanner/Scanner.ino

@@ -103,14 +103,14 @@ void printKnownChips(byte address)
     case 0x1C: Serial.print(F("LIS3MDL")); break;
     case 0x1D: Serial.print(F("LSM303D,LSM9DS0,ADXL345,MMA7455L,LSM9DS1,LIS3DSH")); break;
     case 0x1E: Serial.print(F("LSM303D,HMC5883L,FXOS8700,LIS3DSH")); break;
-    case 0x20: Serial.print(F("MCP23017,MCP23008,FXAS21002")); break;
-    case 0x21: Serial.print(F("MCP23017,MCP23008")); break;
-    case 0x22: Serial.print(F("MCP23017,MCP23008")); break;
-    case 0x23: Serial.print(F("MCP23017,MCP23008")); break;
-    case 0x24: Serial.print(F("MCP23017,MCP23008")); break;
-    case 0x25: Serial.print(F("MCP23017,MCP23008")); break;
-    case 0x26: Serial.print(F("MCP23017,MCP23008")); break;
-    case 0x27: Serial.print(F("MCP23017,MCP23008,LCD16x2,DigoleDisplay")); break;
+    case 0x20: Serial.print(F("MCP23017,MCP23008,PCF8574,FXAS21002")); break;
+    case 0x21: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
+    case 0x22: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
+    case 0x23: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
+    case 0x24: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
+    case 0x25: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
+    case 0x26: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
+    case 0x27: Serial.print(F("MCP23017,MCP23008,PCF8574,LCD16x2,DigoleDisplay")); break;
     case 0x28: Serial.print(F("BNO055,EM7180,CAP1188")); break;
     case 0x29: Serial.print(F("TSL2561,VL6180,TSL2561,TSL2591,BNO055,CAP1188")); break;
     case 0x2A: Serial.print(F("SGTL5000,CAP1188")); break;