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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1You might be better to get a GPIO extender. There are chips which give access to many additional pins, and some of the Pi libraries have inbuilt support. e.g. raspberrypi.stackexchange.com/questions/10297/…– MilliwaysAug 17, 2018 at 22:10
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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.
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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 Feb 27, 2019 at 23:09