I am an absolute beginner and wanted to build a simple home automation system using [DTMF][1] module using this [guide][2]. My problem is out of 12 pins most of them are getting used in DTMF module(5) and the relay module(4). So how do i add an LCD display to it?


 


  [1]: https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling
  [2]: https://roboindia.com/tutorials/dtmf-home-automation-with-arduino