Raspberry pi interfaced with arduino

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hi

i thinking of project raspberry pi, due capacity issues, main controller in charge of 1 or 2 arduinos.

in 1 specific scenario, raspberry reach out web server read user-configured lights-on/lights-off time.  data in raspberry , have transferred arduino in charge of lights.

i'm guessing 1 option raspberry somehow notify arduino.  options notifying arduino?

spi, uart, i2c, digital pin going high or low, start.


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