Update README.md

README.md

@@ -78,5 +78,7 @@ pin 16 is used for psram but you may get away with using it as input for a butto
 You could also use 1 and 3 if you do not use Serial or 14,2&15 if not using SD Card
 Other possible pins you could solder directly to the esp32 module?    17, 9, 10, 11, 6, 7, 8
 More info: https://randomnerdtutorials.com/esp32-cam-ai-thinker-pinout/
+Another option (which I have not actually tried yet) would be to attach a MCP23017 Bidirectional 16-Bit I/O Expander (possibly need to use the serial tx and rx pins) which would then give you 16 gpio pins to play with :-)
+
 
                                                                 https://github.com/alanesq/esp32cam-demo