How To Use Digital Inputs; Reading Bumper Switches - Raspberry Pi RoboPi User Manual

RoboPi v1.00

How to use Digital Inputs

Reading Bumper Switches

Probably the simplest digital input possible is a switch.
<insert schematic of two bumper switches, 100k pullup to 5v, shorts to ground when closed>
#include <stdio.h>
#include "RoboPiLib.h"
#define LEFT_BUMPER
#define RIGHT_BUMPER 23
#define PRESSED 0
int main(int argc, char *argv[]) {
RoboPiInit("/dev/ttyAMA0",115200);
pinMode(LEFT_BUMPER, INPUT);
pinMode(RIGHT_BUMPER, INPUT);
while (1) {
if (digitalRead(LEFT_BUMPER)==PRESSED)
if (digitalRead(RIGHT_BUMPER)==PRESSED)
sleep(1); // only check once per second
}
}
http://Mikronauts.com
User Manual v0.85
22
puts("Left Bumper Pressed");
puts("Right Bumper Pressed");
Copyright 2014 William Henning
17 2014-01-27