IOT NodeMCU - IFTTT Templet to send SMS

Internet ofThings
IFTTT Templet to send SMS
Eng. Elaf A.Saeed

The Contents
• Gas sensor mq-2
• IOT platform.
• IFTTT platform.
• IFTTT platform to send gas alarm SMS.

IFTTT Templet to send SMS
With ESP8266 NodeMCU

Gas sensor mq-2
• MQ2 is one of the commonly used gas sensors in MQ sensor series. It is a
Metal Oxide Semiconductor (MOS) type Gas Sensor also known as
Chemiresistors as the detection is based upon change of resistance of the
sensing material when the Gas comes in contact with the material. Using a
simple voltage divider network, concentrations of gas can be detected.
• MQ2 Gas sensor works on 5V DC and draws around 800mW. It can detect
LPG, Smoke, Alcohol, Propane, Hydrogen, Methane and Carbon Monoxide
concentrations anywhere from 200 to 10000ppm.

Gas sensor mq-2 (cont.)
• Here are the complete specifications

Gas sensor mq-2
❑MQ2 Gas Sensor Module
• Since MQ2 Gas Sensor is not breadboard compatible, we do recommend this
handy little breakout board. It’s very easy to use and comes with two different
outputs. It not only provides a binary indication of the presence of
combustible gases but also an analog representation of their concentration in
air.

Gas sensor mq-2
❑MQ2 Gas Sensor Module (Cont.)
• The analog signal from MQ2 Gas sensor is further fed to LM393 High
Precision Comparator (soldered on the bottom of the module), of course to
digitize the signal. Along with the comparator is a little potentiometer you can
turn to adjust the sensitivity of the sensor. You can use it to adjust the
concentration of gas at which the sensor detects it.

Gas sensor mq-2
❑Calibrate MQ2 Gas Sensor Module
• To calibrate the gas sensor you can hold the gas sensor near smoke/gas you
want to detect and keep turning the potentiometer until the Red LED on the
module starts glowing. Turn the screw clockwise to increase sensitivity or
anticlockwise to decrease sensitivity.

Gas sensor mq-2
❑Calibrate MQ2 Gas Sensor Module (Cont.)
• The comparator on the module continuously checks if the analog pin (A0) has
hit the threshold value set by potentiometer. When it crosses the threshold, the
digital pin (D0) will go HIGH and signal LED turns on. This setup is very
useful when you need to trigger an action when certain threshold is reached.
For example, when the smoke crosses a threshold, you can turn on or off a
relay or instruct your robot to blow air/sprinkle water. You got the idea!

Gas sensor mq-2
❑MQ2 Gas Sensor Module Pinout
• VCC supplies power for the module. You can connect it
to 5V output from your Arduino.
• GND is the Ground Pin and needs to be connected to
GND pin on the Arduino.
• D0 provides a digital representation of the presence of
combustible gases.
• A0 provides analog output voltage in proportional to the
concentration of smoke/gas.

Iot platform
• IoT platforms originated in the form of IoT middleware, which purpose was
to function as a mediator between the hardware and application layers. Its
primary tasks included data collection from the devices over different
protocols and network topologies, remote device configuration and control,
device management, and over-the-air firmware updates.

Iot platform
• Its manages the connectivity of devices.
• It enables developers to build new mobile software applications.
• It allows you to collect devices data.
• It allows your backend IT applications to communicate with your devices.

IFTtt platform
• Sign up to IFTTT Platform

IFTtt platform to send gas alarm
sms
• After sign up click on create

sms (cont.)
• Click on (if this)

sms (cont.)

sms (cont.)
• Write on search ➔ webhooks ➔ click on it.

sms (cont.)
click

sms (cont.)
click
Write the events
name

sms (cont.)
Click

sms (cont.)
Phone No.
The message

sms (cont.)
• Now we specify the URL that is used to trigger the events.

sms (cont.)
Event name
Click to test the event

sms (cont.)
URL to
Trigger the
events
The
response

sms (cont.)
• Also the message received in your phone.

sms (cont.)
• Circuit Design

sms (cont.)
• The analog output of MQ2 and MQ9 is between 0V to 5V whereas the analog
pin of nodemcu can only read between 0V to 3.3V. That means nodemcu
cannot read the data if MQ2 or MQ9 sensor output is above 3.3V. The data
read is not accurate. Therefore, voltage is needed step down.
• In this project, voltage divider by two resistors is used. The voltage output is
determined by the ratio of the value of two resistors. I use 180ohm as R1 and
330ohm as R2 so that Vout is 3.3V.

sms (cont.)
• Code:

IOT NodeMCU - IFTTT Templet to send SMS

Recommandé

Recommandé

Contenu connexe

Tendances

Tendances (20)

Similaire à IOT NodeMCU - IFTTT Templet to send SMS

Similaire à IOT NodeMCU - IFTTT Templet to send SMS (20)

Plus de Elaf A.Saeed

Plus de Elaf A.Saeed (20)

Dernier

Dernier (20)

IOT NodeMCU - IFTTT Templet to send SMS