구차니의 잡동사니 모음

Sensitivity range: up to 20 feet (6 meters) 110° x 70° detection range

Power supply: 3V-9V input voltage, but 5V is ideal.

If the Rtime potentiometer is turned all the way down counter-clockwise (to 0 ohms) then

Tx = 24576 x (10K) x 0.01uF = 2.5 seconds (approx)

If the Rtime potentiometer is turned all the way up clockwise to 1 Megaohm then

Tx = 24576 x (1010K) x 0.01uF = 250 seconds (approx)

[링크 : https://learn.adafruit.com/downloads/pdf/pir-passive-infrared-proximity-motion-sensor.pdf] 

pi@raspberrypi ~ $  gpio readall

 +-----+-----+---------+------+---+-Model B2-+---+------+---------+-----+-----+

 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |

 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+

 |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |

 |   2 |   8 |   SDA.1 |   IN | 1 |  3 || 4  |   |      | 5V      |     |     |

 |   3 |   9 |   SCL.1 |   IN | 1 |  5 || 6  |   |      | 0v      |     |     |

 |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 1 | ALT0 | TxD     | 15  | 14  |

 |     |     |      0v |      |   |  9 || 10 | 1 | ALT0 | RxD     | 16  | 15  |

 |  17 |   0 | GPIO. 0 |  OUT | 0 | 11 || 12 | 0 | IN   | GPIO. 1 | 1   | 18  |

 |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |

 |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | IN   | GPIO. 4 | 4   | 23  |

 |     |     |    3.3v |      |   | 17 || 18 | 0 | IN   | GPIO. 5 | 5   | 24  |

 |  10 |  12 |    MOSI |   IN | 0 | 19 || 20 |   |      | 0v      |     |     |

 |   9 |  13 |    MISO |   IN | 0 | 21 || 22 | 0 | IN   | GPIO. 6 | 6   | 25  |

 |  11 |  14 |    SCLK |   IN | 0 | 23 || 24 | 1 | IN   | CE0     | 10  | 8   |

 |     |     |      0v |      |   | 25 || 26 | 1 | IN   | CE1     | 11  | 7   |

 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+

 |  28 |  17 | GPIO.17 |   IN | 0 | 51 || 52 | 0 | IN   | GPIO.18 | 18  | 29  |

 |  30 |  19 | GPIO.19 |   IN | 0 | 53 || 54 | 0 | IN   | GPIO.20 | 20  | 31  |

 +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+

 | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |

 +-----+-----+---------+------+---+-Model B2-+---+------+---------+-----+-----+

pi@raspberrypi ~ $ gpio read 1

0

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

1

pi@raspberrypi ~ $ gpio read 1

0

pi@raspberrypi ~ $ gpio read 1

0

pi@raspberrypi ~ $ gpio read 1

0 

$ gpio pwm 1 30; sleep 1; gpio pwm 1 110; sleep 1;gpio pwm 1 30; sleep 1; gpio pwm 1 110; sleep 1 

$ sudo apt-get install git-core

$ mkdir ~/src

$ cd ~/src

$ git clone git://git.drogon.net/wiringPi

$ cd wiringPi

$ git pull origin

$ ./build 

[링크 : http://wiringpi.com/download-and-install/]

1. The ic will latch a bit of data when the rising edge of the clock coming, And the data should changed after the falling edge of the clock;

2. The flag bits is two “1”;

3. The verify dta B7’is equal to ~B7,and B6’1S ~B6,B7 and B6 are the gray data of blue

4. the serial data is MSB first ,and the sortorder is blue ,green, red 

Zero-length arrays are allowed in GNU C. They are very useful as the last element of a structure that is really a header for a variable-length object:

struct line

{

int length;

char contents[0];

};

struct line *thisline = (struct line *)malloc (sizeof (struct line) + this_length);

thisline->length = this_length;

[링크 : https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html]