Take a photo with a system camera using a button connected to GPIO!

.gitignore

trigger-camera

compile

#!/bin/bash
gcc -o trigger-camera main.c -lwiringPi

main.c

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <wiringPi.h>

#define TRIGGER_PIN 9

void setup() {
	if (wiringPiSetup () == -1) {
		exit (1);
	}

	printf ("Setup... \n");

	printf("Button pin: %d\n", TRIGGER_PIN);
	pinMode(TRIGGER_PIN, INPUT);
}

void waitButton (void) {
	printf ("Waiting for button press...\n");
	while (digitalRead(TRIGGER_PIN) == HIGH) {
		delay (50);
	}
	printf ("Button pressed!\n");
}

void takePhoto() {
	printf("Taking photo...\n");
	system("./takephoto.sh");
	printf("Photo captured!\n");
}

int main (void) {
	setup();
	for(;;) {
		waitButton();
		//delay(1000);
		takePhoto();
		//delay(1000);
	}
}

takephoto.sh

#!/bin/bash
#TIMESTAMP=$(date +"%m-%d-%Y")
DATE=`date +"%Y-%m-%d"`
TIME=`date +"%H-%M-%S"`
ROOT=/julfest/bilder

mkdir -p $ROOT/$DATE/

FILENAME="$ROOT/$DATE/julfest $DATE $TIME.jpg"

gphoto2 --auto-detect --capture-image --get-all-files --filename="$FILENAME"

chown djazz:users "$FILENAME"

trigger-camera.service

[Unit]
Description=Trigger Camera Service
Requires=network.target local-fs.target

[Service]
Type=forking
KillMode=none
ExecStart=/usr/bin/tmux new-session -d -P -s trigger-camera -n trigger-camera ./trigger-camera
ExecStop=/usr/bin/tmux send-keys -t trigger-camera:trigger-camera C-c
WorkingDirectory=/path/to/trigger-camera/

[Install]
WantedBy=multi-user.target