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Even the Raspberry Pi Foundation used GPIO numbers over (congruous) physical pin numbers: https://www.raspberrypi.org/learning/introduction-to-processing/worksheet-2/ Switch our examples as well, so that it they're more clear and hardware-agnostic.
20 lines
402 B
Plaintext
20 lines
402 B
Plaintext
import processing.io.*;
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// GPIO numbers refer to different phyiscal pins on various boards
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// On the Raspberry Pi GPIO 4 is physical pin 7 on the header
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void setup() {
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GPIO.pinMode(4, GPIO.INPUT);
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}
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void draw() {
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// sense the input pin
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if (GPIO.digitalRead(4) == GPIO.HIGH) {
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fill(255);
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} else {
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fill(204);
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}
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stroke(255);
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ellipse(width/2, height/2, width*0.75, height*0.75);
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}
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