Luftfeuchtigkeitssensor mit Python abrufen
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// How to access GPIO registers from C-code on the Raspberry-Pi
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// Example program
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// 15-January-2012
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// Dom and Gert
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//
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// Access from ARM Running Linux
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#define BCM2708_PERI_BASE 0x20000000
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#define GPIO_BASE (BCM2708_PERI_BASE + 0x200000) /* GPIO controller */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <bcm2835.h>
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#include <unistd.h>
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#define MAXTIMINGS 100
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//#define DEBUG
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#define DHT11 11
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#define DHT22 22
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#define AM2302 22
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int readDHT(int type, int pin);
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int main(int argc, char **argv)
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{
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if (!bcm2835_init())
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return 1;
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if (argc != 3) {
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printf("usage: %s [11|22|2302] GPIOpin#\n", argv[0]);
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printf("example: %s 2302 4 - Read from an AM2302 connected to GPIO #4\n", argv[0]);
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return 2;
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}
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int type = 0;
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if (strcmp(argv[1], "11") == 0) type = DHT11;
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if (strcmp(argv[1], "22") == 0) type = DHT22;
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if (strcmp(argv[1], "2302") == 0) type = AM2302;
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if (type == 0) {
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printf("Select 11, 22, 2302 as type!\n");
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return 3;
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}
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int dhtpin = atoi(argv[2]);
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if (dhtpin <= 0) {
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printf("Please select a valid GPIO pin #\n");
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return 3;
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}
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printf("Using pin #%d\n", dhtpin);
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readDHT(type, dhtpin);
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return 0;
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} // main
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int bits[250], data[100];
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int bitidx = 0;
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int readDHT(int type, int pin) {
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int counter = 0;
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int laststate = HIGH;
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int j=0;
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// Set GPIO pin to output
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bcm2835_gpio_fsel(pin, BCM2835_GPIO_FSEL_OUTP);
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bcm2835_gpio_write(pin, HIGH);
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usleep(500000); // 500 ms
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bcm2835_gpio_write(pin, LOW);
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usleep(20000);
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bcm2835_gpio_fsel(pin, BCM2835_GPIO_FSEL_INPT);
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data[0] = data[1] = data[2] = data[3] = data[4] = 0;
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// wait for pin to drop?
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while (bcm2835_gpio_lev(pin) == 1) {
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usleep(1);
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}
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// read data!
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for (int i=0; i< MAXTIMINGS; i++) {
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counter = 0;
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while ( bcm2835_gpio_lev(pin) == laststate) {
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counter++;
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//nanosleep(1); // overclocking might change this?
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if (counter == 1000)
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break;
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}
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laststate = bcm2835_gpio_lev(pin);
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if (counter == 1000) break;
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bits[bitidx++] = counter;
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if ((i>3) && (i%2 == 0)) {
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// shove each bit into the storage bytes
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data[j/8] <<= 1;
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if (counter > 200)
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data[j/8] |= 1;
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j++;
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}
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}
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#ifdef DEBUG
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for (int i=3; i<bitidx; i+=2) {
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printf("bit %d: %d\n", i-3, bits[i]);
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printf("bit %d: %d (%d)\n", i-2, bits[i+1], bits[i+1] > 200);
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}
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#endif
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printf("Data (%d): 0x%x 0x%x 0x%x 0x%x 0x%x\n", j, data[0], data[1], data[2], data[3], data[4]);
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if ((j >= 39) &&
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(data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)) ) {
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// yay!
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if (type == DHT11)
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printf("Temp = %d *C, Hum = %d \%\n", data[2], data[0]);
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if (type == DHT22) {
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float f, h;
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h = data[0] * 256 + data[1];
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h /= 10;
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f = (data[2] & 0x7F)* 256 + data[3];
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f /= 10.0;
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if (data[2] & 0x80) f *= -1;
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printf("Temp = %.1f *C, Hum = %.1f \%\n", f, h);
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}
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return 1;
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}
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return 0;
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}
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40
Fremddateien/Adafruit_DHT.py
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40
Fremddateien/Adafruit_DHT.py
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#!/usr/bin/env python
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# -*- coding:utf-8 -*-
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import sys
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import dhtreader
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DHT11 = 11
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DHT22 = 22
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AM2302 = 22
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dhtreader.init()
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if len(sys.argv) != 3:
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print("usage: {0} [11|22|2302] GPIOpin#".format(sys.argv[0]))
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print("example: {0} 2302 Read from an AM2302 connected to GPIO #4".format(sys.argv[0]))
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sys.exit(2)
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dev_type = None
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if sys.argv[1] == "11":
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dev_type = DHT11
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elif sys.argv[1] == "22":
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dev_type = DHT22
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elif sys.argv[1] == "2302":
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dev_type = AM2302
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else:
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print("invalid type, only 11, 22 and 2302 are supported for now!")
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sys.exit(3)
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dhtpin = int(sys.argv[2])
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if dhtpin <= 0:
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print("invalid GPIO pin#")
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sys.exit(3)
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#print("using pin #{0}".format(dhtpin))
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t, h = dhtreader.read(dev_type, dhtpin)
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if t and h:
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print "%.3f; %.3f" % (t, h)
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else:
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print("Failed to read from sensor, maybe try again?")
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@ -1,3 +1,4 @@
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Für alle Dateien von Adafruit
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============
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Copyright (c) 2012-2013 Limor Fried, Kevin Townsend and Mikey Sklar for Adafruit Industries.
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All rights reserved.
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@ -23,3 +24,15 @@ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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Für airsensor/airsensor.c
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============
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https://code.google.com/p/usb-sensors-linux/
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Für send.py
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============
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(c) hakermania http://ubuntuforums.org/showthread.php?t=1472520&p=12104667#post12104667
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Für transpose.py
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===========
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(c) Peter Reutemann: http://www.cs.waikato.ac.nz/~fracpete/programming/csv2gnuplot/
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BIN
Fremddateien/dhtreader.so
Executable file
BIN
Fremddateien/dhtreader.so
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export.sh
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export.sh
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temp4=$(echo "scale=3; $(grep 't=' /sys/bus/w1/devices/w1_bus_master1/10-00080277a5db/w1_slave | awk -F 't=' '{print $2}') / 1000" | bc -l)
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done
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luft_roh=$(sudo /home/pi/Temperaturmessung/Fremddateien/Adafruit_DHT 2302 17 |grep Hum ) # Rohdaten des Luftfeuchtigkeits-Sensors
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luft_temp=$(echo $luft_roh | cut -c 8,9,10,11) # Luftfeuchtigkeit-Sensor auftrennen
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luft_feucht=$(echo $luft_roh | cut -c 23,24,25,26)
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luft_roh=$(sudo python /home/pi/Temperaturmessung/Fremddateien/Adafruit_DHT.py 2302 17) # Rohdaten des Luftfeuchtigkeits-Sensors
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set -- $luft_roh
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luft_temp=$1
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luft_feucht=$2
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while [ -z "$luft_roh" ] || [ "$(echo $luft_temp '>' 40 | bc -l)" -eq 1 ] || [ "$(echo $luft_temp '<' -20 | bc -l)" -eq 1 ]
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do
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echo "----Luft: $luft_roh"
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luft_roh=$(sudo /home/pi/Temperaturmessung/Fremddateien/Adafruit_DHT 2302 17 |grep Hum )
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luft_temp=$(echo $luft_roh | cut -c 8,9,10,11) # Luftfeuchtigkeit-Sensor auftrennen
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luft_feucht=$(echo $luft_roh | cut -c 23,24,25,26)
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luft_roh=$(sudo python /home/pi/Temperaturmessung/Fremddateien/Adafruit_DHT.py 2302 17) # Rohdaten des Luftfeuchtigkeits-Sensors
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set -- $luft_roh
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luft_temp=$1
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luft_feucht=$2
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done
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druck_roh=$(sudo python /home/pi/Temperaturmessung/Fremddateien/Adafruit_BMP085_auswertung.py) # Rohdaten des Luftdruck-Sensors
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set -- $druck_roh #Zerlegen mithilfe von IFS (siehe ganz oben)
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