I am planning on recreating the jeeputer with some added security and some features and what I wanna do is have the arduino which is connected to the keypad be shortcuts after it is started up (press 1 to turn off and on radio press 2 turn cb on and off and so on) this way I dont have to scroll through pages while driving. but I am not entirely sure on how to have it send the commands to the other arduino. Can someone explain on how to do this or point me to a tutorial on how to do this.
just connect the rx to tx and tx to rx.
Tangent to the OP, how hard is it to get two arduinos running together via SPI? Anyone have a good example? I’m really misreble without something to reference.