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‎README.md

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# Temperature and humidity Arduino monitor
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This is the source code for a very simple temperature and humidity logger based
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on an Arduino and the DHT22 sensor.
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## Hardware
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You will need:
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* Arduino board (with an USB cable)
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* DHT22 sensor
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## Arduino source code
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The Arduino source code is in the `src` directory, and can be compiled using
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the Arduino IDE.
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You also need to install the [DHT11/DHT22
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library](https://github.com/adafruit/DHT-sensor-library) into your `libraries`
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folder.
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## Monitor script
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You will need the `pyserial` module to use the monitoring script in the
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`monitoring` directory:
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pip install pyserial
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You can then read temperature and humidity data from the Arduino connected by
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an USB cable, by running:
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python monitor/arduino_monitor.py
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## Zabbix template
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You must first install the template found in the `zabbix` directory, and add it
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to the host the Arduino board is attached to.
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To send temperature and humidity data to Zabbix, you will also need the
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`py-zabbix` package:
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pip install py-zabbix
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Copy the script somewhere:
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mkdir -pv /var/lib/zabbix/scripts
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cp monitor/arduino_monitor.py /var/lib/zabbix/scripts
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Copy the systemd service:
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cp systemd/arduino-sensors.service /etc/systemd/system
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You can optionally edit the `--host`, `--temperature-item` and
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`--humidity-item` arguments to match the names of the host and items you use on
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your Zabbix installation.
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Reload, enable and start:
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systemctl daemon-reload
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systemctl enable arduino-sensors.service
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systemctl start arduino-sensors.service

‎arduino/sensors.ino

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#include "DHT.h"
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#define DHTPIN 2
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#define DHTTYPE DHT22
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#define INTERVAL_SEC 10
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DHT dht(DHTPIN, DHTTYPE);
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void setup() {
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Serial.begin(9600);
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Serial.println("-- Humidity/Temperature monitor");
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Serial.print("-- Printing every ");
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Serial.print(INTERVAL_SEC);
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Serial.println("s");
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Serial.println("-- Values: H (in %),T (in Celsius)");
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dht.begin();
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}
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void loop() {
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float h = dht.readHumidity();
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float t = dht.readTemperature();
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if (isnan(h) || isnan(t)) {
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Serial.println("Failed to read from DHT sensor");
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return;
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}
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Serial.print(h);
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Serial.print(",");
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Serial.print(t);
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Serial.print("\n");
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delay(10000);
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}

‎monitor/arduino_monitor.py

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#!/usr/bin/python
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# coding=utf-8
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# Base Python File (arduino_monitor.py)
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# Created: Sat 24 Oct 2015 12:53:17 PM CEST
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# Version: 1.0
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#
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# This Python script was developped by François-Xavier Thomas.
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# You are free to copy, adapt or modify it.
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# If you do so, however, leave my name somewhere in the credits, I'd appreciate it ;)
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#
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# (ɔ) François-Xavier Thomas <fx.thomas@gmail.com>
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"""Zabbix monitor for temperature and humidity on an Arduino DHT11/DHT22 sensor"""
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import argparse
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import logging
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import sys
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import os
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from serial import Serial
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument("--device", "-d", default="/dev/ttyACM0",
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help="TTY device on which the Arduino is connected")
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parser.add_argument("--host", "-s", default=None,
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help="Send to Zabbix host on which the trap metric is defined")
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parser.add_argument("--temperature-item", "-t", default="arduino.temperature",
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help="Temperature item name")
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parser.add_argument("--humidity-item", "-m", default="arduino.humidity",
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help="Humidity item name")
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parser.add_argument("--verbose", "-v", action="store_true")
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args = parser.parse_args()
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# Setup logging
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class NamedLoggerAdapter(logging.LoggerAdapter):
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def process(self, msg, kwargs):
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if args.host:
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return '%s: %s' % (args.host, msg), kwargs
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else:
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return msg, kwargs
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logging_level = logging.DEBUG if args.verbose else logging.INFO
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logging.basicConfig(stream=sys.stderr, level=logging_level)
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log = NamedLoggerAdapter(logging.getLogger(), {})
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# Connect to the serial device
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if not os.path.exists(args.device):
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log.error("Device %s does not exist, exiting.", args.device)
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sys.exit(1)
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serial = Serial(args.device, 9600)
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# Try to setup Zabbix
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if args.host:
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try:
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from zabbix.sender import ZabbixMetric, ZabbixSender
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sender = ZabbixSender(use_config=True)
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log.info("Zabbix support enabled for host: %s", args.host)
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except ImportError:
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log.error("Zabbix support not enabled: py-zabbix not found.")
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sys.exit(2)
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# Read from serial forever
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while True:
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# Try and parse a line
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data = serial.readline()
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try:
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hum, temp = map(float, data.strip().split(b","))
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# If the output cannot be parsed, print it as is
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except:
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log.info(data.decode("ascii").strip())
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# Otherwise, assume we got temp/humidity values
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else:
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# Write temperature/humidity data to stderr
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log.info("Read %s: %s%%", args.humidity_item, hum)
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log.info("Read %s: %s°C", args.temperature_item, temp)
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# Send to Zabbix, if --host is present
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if args.host:
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sender.send([
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ZabbixMetric(args.host, args.humidity_item, str(hum)),
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ZabbixMetric(args.host, args.temperature_item, str(temp)),
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])

‎monitor/requirements.txt

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py-zabbix
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pyserial

‎systemd/arduino-sensors.service

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[Unit]
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Description=Arduino Sensor monitoring service
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Wants=zabbix-server.service
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After=zabbix-server.service
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[Service]
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Type=simple
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ExecStart=/usr/bin/python /var/lib/zabbix/scripts/arduino_monitor.py --host %H
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StandardOutput=syslog
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StandardError=syslog
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[Install]
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WantedBy=multi-user.target

‎zabbix/arduino_template.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<zabbix_export>
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<version>2.0</version>
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<date>2016-01-14T22:25:21Z</date>
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<groups>
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<group>
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<name>Templates</name>
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</group>
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</groups>
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<templates>
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<template>
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<template>Template Arduino Sensors</template>
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<name>Template Arduino Sensors</name>
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<description/>
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<groups>
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<group>
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<name>Templates</name>
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</group>
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</groups>
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<applications>
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<application>
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<name>Arduino Sensors</name>
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</application>
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</applications>
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<items>
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<item>
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<name>Arduino Humidity Sensor</name>
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<type>2</type>
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<snmp_community/>
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<multiplier>0</multiplier>
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<snmp_oid/>
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<key>arduino.humidity</key>
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<delay>0</delay>
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<history>90</history>
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<trends>365</trends>
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<status>0</status>
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<value_type>0</value_type>
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<allowed_hosts/>
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<units>%</units>
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<delta>0</delta>
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<snmpv3_contextname/>
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<snmpv3_securityname/>
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<snmpv3_securitylevel>0</snmpv3_securitylevel>
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<snmpv3_authprotocol>0</snmpv3_authprotocol>
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<snmpv3_authpassphrase/>
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<snmpv3_privprotocol>0</snmpv3_privprotocol>
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<snmpv3_privpassphrase/>
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<formula>1</formula>
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<delay_flex/>
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<params/>
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<ipmi_sensor/>
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<data_type>0</data_type>
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<authtype>0</authtype>
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<username/>
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<password/>
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<publickey/>
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<privatekey/>
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<port/>
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<description/>
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<inventory_link>0</inventory_link>
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<applications>
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<application>
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<name>Arduino Sensors</name>
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</application>
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</applications>
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<valuemap/>
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<logtimefmt/>
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</item>
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<item>
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<name>Arduino Temperature Sensor</name>
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<type>2</type>
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<snmp_community/>
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<multiplier>0</multiplier>
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<snmp_oid/>
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<key>arduino.temperature</key>
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<delay>0</delay>
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<history>90</history>
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<trends>365</trends>
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<status>0</status>
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<value_type>0</value_type>
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<allowed_hosts/>
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<units>°C</units>
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<delta>0</delta>
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<snmpv3_contextname/>
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<snmpv3_securityname/>
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<snmpv3_securitylevel>0</snmpv3_securitylevel>
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<snmpv3_authprotocol>0</snmpv3_authprotocol>
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<snmpv3_authpassphrase/>
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<snmpv3_privprotocol>0</snmpv3_privprotocol>
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<snmpv3_privpassphrase/>
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<formula>1</formula>
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<delay_flex/>
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<params/>
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<ipmi_sensor/>
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<data_type>0</data_type>
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<authtype>0</authtype>
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<username/>
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<password/>
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<publickey/>
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<privatekey/>
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<port/>
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<description/>
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<inventory_link>0</inventory_link>
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<applications>
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<application>
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<name>Arduino Sensors</name>
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</application>
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</applications>
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<valuemap/>
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<logtimefmt/>
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</item>
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</items>
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<discovery_rules/>
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<macros/>
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<templates/>
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<screens/>
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</template>
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</templates>
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<graphs>
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<graph>
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<name>Arduino Sensors</name>
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<width>900</width>
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<height>200</height>
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<yaxismin>0.0000</yaxismin>
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<yaxismax>100.0000</yaxismax>
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<show_work_period>1</show_work_period>
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<show_triggers>1</show_triggers>
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<type>0</type>
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<show_legend>1</show_legend>
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<show_3d>0</show_3d>
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<percent_left>0.0000</percent_left>
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<percent_right>0.0000</percent_right>
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<ymin_type_1>0</ymin_type_1>
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<ymax_type_1>0</ymax_type_1>
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<ymin_item_1>0</ymin_item_1>
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<ymax_item_1>0</ymax_item_1>
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<graph_items>
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<graph_item>
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<sortorder>0</sortorder>
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<drawtype>0</drawtype>
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<color>000099</color>
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<yaxisside>0</yaxisside>
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<calc_fnc>2</calc_fnc>
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<type>0</type>
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<item>
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<host>Template Arduino Sensors</host>
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<key>arduino.humidity</key>
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</item>
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</graph_item>
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<graph_item>
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<sortorder>1</sortorder>
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<drawtype>0</drawtype>
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<color>C80000</color>
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<yaxisside>1</yaxisside>
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<calc_fnc>2</calc_fnc>
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<type>0</type>
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<item>
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<host>Template Arduino Sensors</host>
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<key>arduino.temperature</key>
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</item>
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</graph_item>
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</graph_items>
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</graph>
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</graphs>
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</zabbix_export>

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