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I'm using a raspberry pi to control some relays hooked up to some lights. I am a controlling the lights via PHP web controls. I've reached a barrier in which there aren't enough GPIO pins to control all the lights I would like to. If I were to buy a second RPi, would it be possible to control it via the same page? I know basic HTML and I know I could just add a link that takes you to the second pi's IP address, but I would like to build a cohesive GUI in a single webpage.

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Only you really understand what you mean by "but I would like to build a cohesive GUI in a single webpage."

My pigpio will let you control the GPIO of multiple Pis from a single location.

The pigpio daemon must be running on each Pi.

  • pigpio is definitely the right answer! You have the choice between pigpio bindings in various languages (C, Python, nodejs, maybe others) - with Python, you can also use the gpiozero library (simple to use) with pigpio as the pin driver. See gpiozero.readthedocs.io/en/latest/remote_gpio.html – ben_nuttall Feb 27 at 23:09

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