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8 Feb 2019 A code library and connection tutorial for connecting an LCD display to one Arduino board using one MCP23S17 port expander. example of one of the more advanced features of the MCP23S17 where we can the methods being used in "bit mode", which replicates the utilitiy of arduino's. A complete library for Microchip MCP23S17(teensy,avr,arm,esp8266). 20 commits · 2 branches Compatible with all 8bit arduino, DUE, Teensy(all), ESP8266. 18 Jan 2016 If you redefine the SS pin using #define SS 9 for example you should set that in which starts the arduino communicating with the MCP23S17.7 Aug 2016 Arduino NANO Tests 2 MCP23S17 IO Xpanders: Wow, my first INSTRUCTABLE.The Arduino's are great little modules. However, they can benefit from the 8 Dec 2016 Pictures: Arduino Mega 2560 with MCP23S17 Port Expander on This fritzing drawing might help show the wiring for this example. Wiring a MCP23S17 can be tricky for beginners, so here is an example for wiring it up. Click here to open the image in full size. 13 Dec 2016 This sketch uses the Majenko Library with two MCP23S17 chips to writePort(uint16_t val) * write val (hex example 0x55AA) to all OUTPUT pins on Port A and