RFID communication

Projects Networking, Protocols, and Devices
1

can RFID be used in parallel up to 16 with arduino and select pin using mcp23017?

2

yes. But keep in mind:

  • you need to adopt the code to use a port on the mcp23017 instead of a digitalWrite of a common pin.
  • the mcp23017 is I2C. When you deal with "select pin" I assume you connect your RFID with SPI. So why don't you use an SPI Port expander like the MCP23S17?
  • using a MEGA instead of an UNO is far easier for a beginner.
  • Revisit your older threads - I assume most of your questions were already answered last year:

grafik
grafik797×335 15.2 KB

4

okay, thank you for the advice