klotik.ru

VCC (+) → контакт 3,3 вольта (1-я ножка) на CON3
GND (-) → контакт GND (6-я ножка) на CON3
Data (S) → контакт GPIO4 (7-я ножка) на CON3

Устанавливаю WiringBP

git clone https://github.com/LeMaker/WiringBP.git -b bananapi
cd WiringBP
chmod +x ./build
./build

git clone https://github.com/BPI-SINOVOIP/BPI-WiringPi.git -b BPI_M1_M1Plus
cd BPI-WiringPi
chmod +x ./build
./build  

С первого раза не собралось. Т.к. я собирал из под roota в файле build удалил все sudo. В конце установки вижу

All Done.

NOTE: This is wiringBPi v1, and if you need to use the lcd, Piface,
  Gertboard, MaxDetext, etc. routines then you must change your
  compile scripts to add -lwiringPiDev

./build  6,60s user 1,00s system 41% cpu 18,390 total

Проверяю.

gpio readall
+----------+-Rev3-+------+--------+------+-------+
| wiringPi | GPIO | Phys | Name   | Mode | Value |
+----------+------+------+--------+------+-------+
|      0   |  17  |  11  | GPIO 0 | ALT4 | Low   |
|      1   |  18  |  12  | GPIO 1 | IN   | Low   |
|      2   |  27  |  13  | GPIO 2 | ALT4 | Low   |
|      3   |  22  |  15  | GPIO 3 | ALT4 | Low   |
|      4   |  23  |  16  | GPIO 4 | IN   | Low   |
|      5   |  24  |  18  | GPIO 5 | IN   | Low   |
|      6   |  25  |  22  | GPIO 6 | ALT4 | Low   |
|      7   |   4  |   7  | GPIO 7 | IN   | Low   |
|      8   |   2  |   3  | SDA    | ALT5 | Low   |
|      9   |   3  |   5  | SCL    | ALT5 | Low   |
|     10   |   8  |  24  | CE0    | IN   | Low   |
|     11   |   7  |  26  | CE1    | IN   | Low   |
|     12   |  10  |  19  | MOSI   | IN   | Low   |
|     13   |   9  |  21  | MISO   | IN   | Low   |
|     14   |  11  |  23  | SCLK   | IN   | Low   |
|     15   |  14  |   8  | TxD    | ALT0 | Low   |
|     16   |  15  |  10  | RxD    | ALT0 | Low   |
|     17   |  28  |   3  | GPIO 8 | IN   | Low   |
|     18   |  29  |   4  | GPIO 9 | ALT4 | Low   |
|     19   |  30  |   5  | GPIO10 | IN   | Low   |
|     20   |  31  |   6  | GPIO11 | ALT4 | Low   |
+----------+------+------+--------+------+-------+

Устанавливаю программу для работы с датчиком DHT22

git clone https://github.com/seblucas/lol_dht22.git
cd lol_dht22
./configure
make

Проверяю:

./loldht
usage: ./loldht <pin>
description: pin is the wiringPi pin number
using 7 (GPIO 4)
Raspberry Pi wiringPi DHT22 reader
www.lolware.net
Humidity = 39.80 % Temperature = 32.00 *C

Создаю ссылку на исполняемый файл.

root@bananapi /usr/local/bin # ln -s /usr/local/src/lol_dht22/loldht loldht
loldht
usage: loldht <pin>
description: pin is the wiringPi pin number
using 7 (GPIO 4)
Raspberry Pi wiringPi DHT22 reader
www.lolware.net
Humidity = 42.40 % Temperature = 26.20 *C

Для удобства мониторинга и хранения данных использую rrdtool. Создаю базу данных с двумя источниками данных therm и hum.

root@bananapi /var/db/rrdtool # rrdtool create dht22_01.rrd --start N --step 300 \
DS:therm:GAUGE:600:U:U \
DS:hum:GAUGE:600:U:U \
RRA:AVERAGE:0.5:1:288 \
RRA:AVERAGE:0.5:6:336 \
RRA:AVERAGE:0.5:12:744 \
RRA:AVERAGE:0.5:144:730

Написал скрипт для добавления данных в базу данных.

cat ht22_rrd.sh
#!/bin/sh

TEMP=`loldht | grep Humidity`
therm=`echo $TEMP | awk '{print $7}'`
hum=`echo $TEMP | awk ' {print $3} '`

/usr/bin/rrdtool update /var/db/rrdtool/dht22_01.rrd N:$therm:$hum

echo -n ${TEMP} >/run/dht-temp
echo -n ${therm} >/var/www/therm/current_temp.csv
echo -n ${hum} >/var/www/therm/current_hyg.csv

exit 0

Добавил в cron строку для выполнения скрипта каждые 5 минут

• /5 * * * * root /scripts/dht22_rrd.sh > /dev/null 2>&1

Ссылки:
http://blog.slucas.fr/blog/banana-pi-7-DHT22-temperature-hygrometrie
https://github.com/BPI-SINOVOIP/BPI-WiringPi
http://wiki.lemaker.org/WiringPi
https://github.com/LeMaker/WiringBP
https://alexbloggt.com/dht11-banana-pi-teil2/