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Step 10Pushbutton Switch for Changing Programs
The pushbutton switch is used to switch between programs. It triggers an interrupt on the Arduino which advances the program number. The Arduino Diecimilia (and others; check for your version) have two external interrupts that can be enabled on digital pins 2 and 3 using the attachInterrupt(interrupt, function, mode) function. Reserve digital pin 3 for the pushbutton switch. This leaves digital pins 0, 1, and 2 and 4, 5, 6, 7, 8 as blocks for the anode pins.
The interrupt is set to trigger when pin 3 goes low. It must therefore be held high until the button is pushed, at which the pin goes low. This requires a 10K pull-up resistor to hold the pin high. See the breadboard image and read about pull-up and pull-down resistors.
The interrupt is set to trigger when pin 3 goes low. It must therefore be held high until the button is pushed, at which the pin goes low. This requires a 10K pull-up resistor to hold the pin high. See the breadboard image and read about pull-up and pull-down resistors.
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