dirkjanfaber

/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the Uno and
  Leonardo, it is attached to digital pin 13. If you're unsure what
  pin the on-board LED is connected to on your Arduino model, check
  the documentation at http://arduino.cc

  This example code is in the public domain.

dirkjanfaber

/*
 * The manualpage of strftime notes:
 *   "The environment variables TZ and LC_TIME are used." 
 *
 * What it does not say is that in order to get the locale
 * to actually work in your program is that 2 things are
 * needed in the code:
 * #include <locale.h>
 * and
 * setlocale(LC_TIME, "");

dirkjanfaber

/*
  This example program reads a value from a file. This file can be updated
  from another program, while this main program never needs to stop.
  
  gcc -O2 -Wall -o readtempfromfile readtempfromfile.c
  
*/

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

dirkjanfaber

/*
  Program that keeps an eye on a (private) thingspeak channel + field and
  acts upon change in value of that field. When the value increases,
  a system call to blink1-tool is called to colour the blink(1) led
  pumpkin orange.

  There are some commandline options:
  -v for VERBOSE
  -a for the apikey
  -c for the thingspeak channel

dirkjanfaber

/*
  Spotify catcher

  Functions as a "man in the middle" for the Spotify Client scrobbles that
  go to post.audioscrobbler.com (last.fm).
  
  Works on an esp8266 (Arduino IDE). Connect an oled to pin 3 (SDA) and
  pin4 (SCL) to show the currently playing song. 
  
  Make sure you put the IP of the esp9266 into /etc/hosts with the name 

dirkjanfaber

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <ctype.h>
#include <string.h>

typedef struct
{
  char *command;
  char *parameter1;

dirkjanfaber

/*
   Compile: gcc -o sine sine.c -lm -Wall
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <math.h>

#define PI 3.14159265

dirkjanfaber

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
#include <stdint.h>
#include <math.h>

#include "pigpio.h"

/*

dirkjanfaber

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <linux/types.h>
#include <linux/spi/spidev.h>
#include <stdint.h>
#include <stdio.h>

dirkjanfaber

#!/bin/bash

# https://learn.adafruit.com/adafruits-raspberry-pi-lesson-8-using-a-servo-motor/software
gpio -g mode 18 pwm
gpio pwm-ms
gpio pwmc 192
gpio pwmr 2000

while [ 1 -gt 0 ]
do