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Robu.in | Indian Online Store | RC Hobby | Robotics
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      • Component Kit
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      • Microcontroller ICs
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      • Upto 3 Inch
      • 3 Inch to 7 Inch
      • 8 Inch to 10 Inch
      • 11 Inch and Above
      • Carbon Fiber Propeller
      • Triblades
      • Propeller Accessories
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    • Creality 3D Printers
    • Electronics Parts
      • 3D Printer Display and Controllers
      • 3D Printer Extruder Kit
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      • Limit Switch
    • Mechnical Parts
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      • Lead Screw and Nut
      • Linear Guide Rail
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      • 3S Lipo (11.1V ~ 12.6V)
      • 4S Lipo (14.8V ~ 16.8V)
      • 6S LiPo (22.2V ~ 25.2V)
    • Orange LiPO Battery
      • 1 Cell (3.7-4.2)V
      • 2 Cell (7.4-8.4)V
      • 3 Cell (11.1-12.6)V
      • 4 Cell (14.8-16.8)V
      • 6 Cell (22.2-25.2)V
    • Micro LiPo Batteries
    • Lithium-Ion Batteries
      • 1 cell (3.7V~4.2V)
      • 2 Cell (7.4V~8.4V)
      • 3 Cell (11.1V~12.6V)
      • 4 Cell (14.8V~16.8V)
      • 5 Cell (18.5V) & Above
    • Orange Premium BMS
    • Other Batteries
      • TX/RX Li-PO Batteries
      • LifePO4 Battery
      • Coin Cell Battery
      • CNC and PLC Machine Battery
    • Battery Accessories
      • Battery Protection Board
      • Battery Pack Accessories & Holders
      • Battery Chargers
      • Battery Connector
      • Battery Harness
      • Power Adapter and Cable
      • Lipo Voltage Checker
      • Parallel Charging Board
      • LiPO Battery Sack, Covers & Mats
  • Motors, Drivers, Actuators
    • Planetary Gear Motor
      • Orange Planetary Gears Motor
      • Orange Planetary BLDC Motors
      • Planetary Gear DC Motors
    • Brushed DC Motor
      • Orange Johnson Geared Motor
      • Johnson Geared Motor (Grade B)
      • DC Geared Motor with Encoder
      • 25 GA Motors
      • Orange OG 555 DC Motor
      • RS 50 Geared Motor
      • Orange RS 775 DC Motor
      • Orange PM33 Motor
      • Orange Square Gear Box Motor
      • Orange Rectangular Gearbox Motor
    • N20 Micro Gear Motor
      • Micro Gear Motor with Encoder
      • Micro Gear Motor without Encoder
    • Stepper Motor
    • Servo Motors
      • Orange RC Servo Motors
      • Emax Servo Motor
      • Other Servo motor
    • Pumps
      • Kamoer High Quality Pumps and Accessories
      • Generic Pumps
      • Pneumatic Connectors and Valves
    • Cooling Fans
    • Linear Motor/Actuator
    • Solenoids & Electromagnets
    • Other DC Motors
      • BO Motors
      • Metal Gear Box Motor
      • Plastic Gear Box Motors
      • Vibration Motor
      • Drone Motor
    • Motor Drivers
      • Brushed DC Motor Driver
      • Servo Motor Driver
      • Stepper Motor Drivers
      • Brushless DC Motor Driver (ESC)
    • Motor Accessories
      • Motor Mounting Brackets
      • Bearings
      • Couplings
      • JR Servo Cable
      • Futaba Servo Cable
      • Push Rod
      • Other Accessories
  • Development Board
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      • Original Arduino Boards
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  • Official Arduino Boards
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    • Seven Segment LED Display
    • LED Dot Matrix Display
  • Sensors
    • Sensor Kits
    • Ultrasonic and Proximity
      • MAXBOTIX Ultrasonic Sonar
      • Ultrasonic Sensor
      • Orange Proximity Sensor
      • Autonics Proximity Sensor
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      • LiDAR Sensor
      • Other Ultrasonic Sensors
    • Temp., Humidity, Gas & Environmental
      • Temperature & Humidity Sensor
      • Environmental Sensors
      • Gas and Dust Sensor
      • Thermoelectric Cooler
    • Motion, Light and Sound
      • PIR / IR and Optical Sensor
      • RFID Card, Tags & Reader
      • Light/Color Sensor
      • Line Sensor
      • Sound Sensor
    • Biometric, Rotation, and Current
      • Biometric/ECG/EMG Sensor
      • Rotary Encoder
      • Current and Voltage
    • Load, Pressure, Flow & Vibration
      • Water TDS, pH, Flow, Level and Pressure Sensor
      • Vibration/Tilt Sensor and Modules
      • Load / Pressure / Force / Flex Sensor
  • Cameras
    • IoT Cameras
    • FPV Cameras
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    • Raspberry Pi Camera
  • IoT and Wireless
    • Ai Thinker ESP Modules and Development Boards
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    • Development Board/Kit
    • xBee Zigbee Module
    • LORA WiFi
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    • Wireless Smart Switches
  • Electronic Modules
    • Programming Module
    • Memory Interfacing
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    • Bluetooth Interfacing
    • Ethernet Module
    • Interface Module
    • LED Module
    • LASER Module
    • Addressable LED and Drivers
    • Breakout Board
    • Relay Switch Modules
    • Electronic Switches/Keypads
    • Solar Panels and Controllers
    • Wearable Electronic
    • Real Time Module (RTC)
    • Audio Module/ Amplifier
    • Mux-DeMux & Logic Converter
    • Voltage Regulator
      • Boost Converter (Step-Up )
      • Buck Converter (Step-Down)
    • Measuring Instruments
      • Digital Multimeter
      • Temperature Meter
      • Digital Voltage, Current and Frequency Meter
      • Oscilloscope & Signal Generator
      • Other Measuring Instrument
    • Power Supply
      • Transformers
      • SMPS
      • Hi-Link Power Supply Module
    • Displays
  • Wires and Cables
    • PVC and Silicone Wires
      • PVC Wire
      • 6 to 10 AWG
      • 12 to 16 AWG
      • 18 to 22 AWG
      • 24 to 30 AWG
    • Cables
      • DuPont / Jumper Cable
      • Interfacing Cables
      • JR Servo cable
      • Futaba servo cable
      • FFC Cable
    • Heat Shrink Tubing / Sleeve
      • Heat Shrink Combos
      • 1 mm to 4 mm
      • 5 mm to 10 mm
      • 11 mm and Above
      • PVC Heat Shrink
    • Tools and Accessories
      • Wire Cutter / Stripper
      • Cable Ties
      • Sleeves and Drag Chain
  • Mechanical Components and Workbench Tools
    • Mechanical Robotic Parts
      • Chassis
      • Aluminum Extrusion and Accessories
      • Smooth Rods
      • Lead Screw
      • Linear Guide Rail
      • Couplings
      • Bearings
      • Motor Mounting Brackets
      • Gears
    • Wheels
      • Mecanum Wheels
      • Omni Wheels
      • Heavy Duty Wheel
      • RC Car Wheel
      • Pulley Wheel & Track Belt
      • Caster Wheels
    • Carbon Fiber
      • Carbon Fiber Sheets and Strips
      • Carbon Fiber Tubes and Rods
    • Nuts-Bolts and Spacers
      • Countersunk(CSK) Screws
      • Socket Set Screws (Allen Grub)
      • Socket Head Cap Screw (Allen Bolt)
      • CHHD Screws
      • Nut and Washers
      • Nylon Nuts and Bolts
      • Spacer and Standoff
    • Soldering Tools
    • Workbench Tools
  • Services
    • PCB Manufacturing Service
    • Custom Battery Pack
    • Online SLA 3D Printing Service
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All Categories
  • Shop by Brands
  • New Arrivals
  • Refurbished
  • Partial Working
  • Electronic Components
    • Basic Electronic Components
      • Component Kit
      • Resistor
      • Inductor
      • Capacitor
      • Diode
      • Transistor
      • Crystal Oscillators
    • Semiconductor ICs
      • Microcontroller ICs
      • Interface ICs
      • Clock, Timer and Counter ICs
      • Sensor ICs
      • Optocoupler ICs
      • Converter ICs
      • Comparator ICs
      • Driver ICs
      • Encoder ICs
      • Audio ICs
      • IC Base
    • LEDs and Indicators
      • LEDs Kit
      • Pilot Lamp Indicator
      • LEDs with Holders
      • Through Hole LED
      • SMD LED
    • Miscellaneous Component
      • Potentiometer
      • Fuse
      • Buzzer/Speaker
      • Aluminium Heat Sink
      • Bread Board and Zero PCB
    • Mechanical Switches
    • Power Connectors
    • RF Connectors
    • Interface Connector
    • Berg / FPC / IDC Connector
  • DIY Learning and Robot Kits
    • Orange Premium Learning Kits
      • Orange Kits for Arduinos
      • Orange Kits for Raspberry Pi
      • Orange Electronic Component Kits
      • Orange DIY Mini Project Kits
    • DIY Hobby Project Parts
    • Robot Kits and Parts
    • Drone Kit
    • DIY 3D Printer Kits
    • Ebike Kit
    • Official Raspberry Pi Kits
    • Kits compatible with Arduino
    • Sensor Kits
    • Component Kit
  • Drone Parts
    • Kits
    • Frames and Accessories
    • Flight Controller & Accessories
    • Motors
    • Speed Controllers (ESC)
    • Propellers
      • Upto 3 Inch
      • 3 Inch to 7 Inch
      • 8 Inch to 10 Inch
      • 11 Inch and Above
      • Carbon Fiber Propeller
      • Triblades
      • Propeller Accessories
    • Drone Transmitter & Receiver
    • Antennas
    • FPV Cameras
    • FPV Antennas and Trans-Receivers
    • Accessories
    • Camera Gimbal
  • E-Bike Parts
    • Ebike Kit
    • Ebike Motor and Controller
    • Ebike Battery
    • Mechanical Accessories
    • Electronics Accessories
  • 3D Printers and Parts
    • Creality 3D Printers
    • Electronics Parts
      • 3D Printer Display and Controllers
      • 3D Printer Extruder Kit
      • 3D Printer Extruder Parts and Fans
      • Stepper Motors and Accessories
      • 3D Printer Display and Controller
      • Limit Switch
    • Mechnical Parts
      • 3D Printer Heatbed and Accessories
      • 3D Printer Nozzle
      • Lead Screw and Nut
      • Linear Guide Rail
      • Aluminum Extrusion and Accessories
      • Smooth Rods
      • 3D Printer Couplings
      • Timing Belt and Pulley
      • Sleeves and Drag Chain
    • 3D Printer Filaments
      • ORANGE Premium Filaments
      • ESUN Filaments
      • Resins
  • Batteries, Chargers and Accessories
    • Custom Battery Pack
    • Lemon Premium Li-PO Battery
      • 2S Lipo (7.4V ~ 8.4V)
      • 3S Lipo (11.1V ~ 12.6V)
      • 4S Lipo (14.8V ~ 16.8V)
      • 6S LiPo (22.2V ~ 25.2V)
    • Orange LiPO Battery
      • 1 Cell (3.7-4.2)V
      • 2 Cell (7.4-8.4)V
      • 3 Cell (11.1-12.6)V
      • 4 Cell (14.8-16.8)V
      • 6 Cell (22.2-25.2)V
    • Micro LiPo Batteries
    • Lithium-Ion Batteries
      • 1 cell (3.7V~4.2V)
      • 2 Cell (7.4V~8.4V)
      • 3 Cell (11.1V~12.6V)
      • 4 Cell (14.8V~16.8V)
      • 5 Cell (18.5V) & Above
    • Orange Premium BMS
    • Other Batteries
      • TX/RX Li-PO Batteries
      • LifePO4 Battery
      • Coin Cell Battery
      • CNC and PLC Machine Battery
    • Battery Accessories
      • Battery Protection Board
      • Battery Pack Accessories & Holders
      • Battery Chargers
      • Battery Connector
      • Battery Harness
      • Power Adapter and Cable
      • Lipo Voltage Checker
      • Parallel Charging Board
      • LiPO Battery Sack, Covers & Mats
  • Motors, Drivers, Actuators
    • Planetary Gear Motor
      • Orange Planetary Gears Motor
      • Orange Planetary BLDC Motors
      • Planetary Gear DC Motors
    • Brushed DC Motor
      • Orange Johnson Geared Motor
      • Johnson Geared Motor (Grade B)
      • DC Geared Motor with Encoder
      • 25 GA Motors
      • Orange OG 555 DC Motor
      • RS 50 Geared Motor
      • Orange RS 775 DC Motor
      • Orange PM33 Motor
      • Orange Square Gear Box Motor
      • Orange Rectangular Gearbox Motor
    • N20 Micro Gear Motor
      • Micro Gear Motor with Encoder
      • Micro Gear Motor without Encoder
    • Stepper Motor
    • Servo Motors
      • Orange RC Servo Motors
      • Emax Servo Motor
      • Other Servo motor
    • Pumps
      • Kamoer High Quality Pumps and Accessories
      • Generic Pumps
      • Pneumatic Connectors and Valves
    • Cooling Fans
    • Linear Motor/Actuator
    • Solenoids & Electromagnets
    • Other DC Motors
      • BO Motors
      • Metal Gear Box Motor
      • Plastic Gear Box Motors
      • Vibration Motor
      • Drone Motor
    • Motor Drivers
      • Brushed DC Motor Driver
      • Servo Motor Driver
      • Stepper Motor Drivers
      • Brushless DC Motor Driver (ESC)
    • Motor Accessories
      • Motor Mounting Brackets
      • Bearings
      • Couplings
      • JR Servo Cable
      • Futaba Servo Cable
      • Push Rod
      • Other Accessories
  • Development Board
    • Official Arduino Boards
      • Original Arduino Boards
      • Official Arduino Shields
      • Official Arduino Kits
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    • 8051 Board
    • Single Board Computer
    • Teensy Board
    • Udoo Board
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    • PIC Development board
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    • Advance Development Boards
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      • Boards
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    • e-Ink Display
    • Seven Segment LED Display
    • LED Dot Matrix Display
  • Sensors
    • Sensor Kits
    • Ultrasonic and Proximity
      • MAXBOTIX Ultrasonic Sonar
      • Ultrasonic Sensor
      • Orange Proximity Sensor
      • Autonics Proximity Sensor
      • Other Proximity Sensor & Modules
      • LiDAR Sensor
      • Other Ultrasonic Sensors
    • Temp., Humidity, Gas & Environmental
      • Temperature & Humidity Sensor
      • Environmental Sensors
      • Gas and Dust Sensor
      • Thermoelectric Cooler
    • Motion, Light and Sound
      • PIR / IR and Optical Sensor
      • RFID Card, Tags & Reader
      • Light/Color Sensor
      • Line Sensor
      • Sound Sensor
    • Biometric, Rotation, and Current
      • Biometric/ECG/EMG Sensor
      • Rotary Encoder
      • Current and Voltage
    • Load, Pressure, Flow & Vibration
      • Water TDS, pH, Flow, Level and Pressure Sensor
      • Vibration/Tilt Sensor and Modules
      • Load / Pressure / Force / Flex Sensor
  • Cameras
    • IoT Cameras
    • FPV Cameras
    • Smart Vision Camera
    • Thermal Cameras
    • Raspberry Pi Camera
  • IoT and Wireless
    • Ai Thinker ESP Modules and Development Boards
    • ESP WiFi Module
    • Development Board/Kit
    • xBee Zigbee Module
    • LORA WiFi
    • Bluetooth and NRF Modules
    • GSM / GPRS Modules
    • Transmitter and Receivers
    • Advance Controller Board
    • Wireless Smart Switches
  • Electronic Modules
    • Programming Module
    • Memory Interfacing
    • Communication Module
    • Bluetooth Interfacing
    • Ethernet Module
    • Interface Module
    • LED Module
    • LASER Module
    • Addressable LED and Drivers
    • Breakout Board
    • Relay Switch Modules
    • Electronic Switches/Keypads
    • Solar Panels and Controllers
    • Wearable Electronic
    • Real Time Module (RTC)
    • Audio Module/ Amplifier
    • Mux-DeMux & Logic Converter
    • Voltage Regulator
      • Boost Converter (Step-Up )
      • Buck Converter (Step-Down)
    • Measuring Instruments
      • Digital Multimeter
      • Temperature Meter
      • Digital Voltage, Current and Frequency Meter
      • Oscilloscope & Signal Generator
      • Other Measuring Instrument
    • Power Supply
      • Transformers
      • SMPS
      • Hi-Link Power Supply Module
    • Displays
  • Wires and Cables
    • PVC and Silicone Wires
      • PVC Wire
      • 6 to 10 AWG
      • 12 to 16 AWG
      • 18 to 22 AWG
      • 24 to 30 AWG
    • Cables
      • DuPont / Jumper Cable
      • Interfacing Cables
      • JR Servo cable
      • Futaba servo cable
      • FFC Cable
    • Heat Shrink Tubing / Sleeve
      • Heat Shrink Combos
      • 1 mm to 4 mm
      • 5 mm to 10 mm
      • 11 mm and Above
      • PVC Heat Shrink
    • Tools and Accessories
      • Wire Cutter / Stripper
      • Cable Ties
      • Sleeves and Drag Chain
  • Mechanical Components and Workbench Tools
    • Mechanical Robotic Parts
      • Chassis
      • Aluminum Extrusion and Accessories
      • Smooth Rods
      • Lead Screw
      • Linear Guide Rail
      • Couplings
      • Bearings
      • Motor Mounting Brackets
      • Gears
    • Wheels
      • Mecanum Wheels
      • Omni Wheels
      • Heavy Duty Wheel
      • RC Car Wheel
      • Pulley Wheel & Track Belt
      • Caster Wheels
    • Carbon Fiber
      • Carbon Fiber Sheets and Strips
      • Carbon Fiber Tubes and Rods
    • Nuts-Bolts and Spacers
      • Countersunk(CSK) Screws
      • Socket Set Screws (Allen Grub)
      • Socket Head Cap Screw (Allen Bolt)
      • CHHD Screws
      • Nut and Washers
      • Nylon Nuts and Bolts
      • Spacer and Standoff
    • Soldering Tools
    • Workbench Tools
  • Services
    • PCB Manufacturing Service
    • Custom Battery Pack
    • Online SLA 3D Printing Service
    • Online FDM 3D Printing Service
    • Metal Laser Cutting Service
    • Non-Metal Laser Cutting Service
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      • Diode
      • Transistor
      • Crystal Oscillators
    • Semiconductor ICs
      • Microcontroller ICs
      • Interface ICs
      • Clock, Timer and Counter ICs
      • Sensor ICs
      • Optocoupler ICs
      • Converter ICs
      • Comparator ICs
      • Driver ICs
      • Encoder ICs
      • Audio ICs
      • IC Base
    • LEDs and Indicators
      • LEDs Kit
      • Pilot Lamp Indicator
      • LEDs with Holders
      • Through Hole LED
      • SMD LED
    • Miscellaneous Component
      • Potentiometer
      • Fuse
      • Buzzer/Speaker
      • Aluminium Heat Sink
      • Bread Board and Zero PCB
    • Mechanical Switches
    • Power Connectors
    • RF Connectors
    • Interface Connector
    • Berg / FPC / IDC Connector
  • DIY Learning and Robot Kits
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      • Upto 3 Inch
      • 3 Inch to 7 Inch
      • 8 Inch to 10 Inch
      • 11 Inch and Above
      • Carbon Fiber Propeller
      • Triblades
      • Propeller Accessories
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    • FPV Antennas and Trans-Receivers
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  • E-Bike Parts
    • Ebike Kit
    • Ebike Motor and Controller
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  • 3D Printers and Parts
    • Creality 3D Printers
    • Electronics Parts
      • 3D Printer Display and Controllers
      • 3D Printer Extruder Kit
      • 3D Printer Extruder Parts and Fans
      • Stepper Motors and Accessories
      • 3D Printer Display and Controller
      • Limit Switch
    • Mechnical Parts
      • 3D Printer Heatbed and Accessories
      • 3D Printer Nozzle
      • Lead Screw and Nut
      • Linear Guide Rail
      • Aluminum Extrusion and Accessories
      • Smooth Rods
      • 3D Printer Couplings
      • Timing Belt and Pulley
      • Sleeves and Drag Chain
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      • ORANGE Premium Filaments
      • ESUN Filaments
      • Resins
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    • Custom Battery Pack
    • Lemon Premium Li-PO Battery
      • 2S Lipo (7.4V ~ 8.4V)
      • 3S Lipo (11.1V ~ 12.6V)
      • 4S Lipo (14.8V ~ 16.8V)
      • 6S LiPo (22.2V ~ 25.2V)
    • Orange LiPO Battery
      • 1 Cell (3.7-4.2)V
      • 2 Cell (7.4-8.4)V
      • 3 Cell (11.1-12.6)V
      • 4 Cell (14.8-16.8)V
      • 6 Cell (22.2-25.2)V
    • Micro LiPo Batteries
    • Lithium-Ion Batteries
      • 1 cell (3.7V~4.2V)
      • 2 Cell (7.4V~8.4V)
      • 3 Cell (11.1V~12.6V)
      • 4 Cell (14.8V~16.8V)
      • 5 Cell (18.5V) & Above
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HomeBlogsIoT based Temperature and Humidity Monitoring using BLYNK Application

IoT based Temperature and Humidity Monitoring using BLYNK Application

Blogs, IOT and Wireless  0  comments  1386 Views  Monday, January 4, 2021











Hi guys, today we will going to make one amazing and very simple IOT project with the help of ESP8266 NodeMCU by which you can monitor the data of a

IOT_DHT

Hi guys, today we will going to make one amazing and very simple IOT project with the help of ESP8266 NodeMCU by which you can monitor the data of a place on your mobile screen from any point of the world.

So what we will going to learn in this project ? 

  1. what is Blynk app?
  2. A short introduction on a DHT-11 sensor and NodeMCU
  3. How to create a new project in a Blynk app?
  4. How to build this project? 
  5. Scope of this project

Before, going to build this project, we will first see the short introduction to the main elements of this tutorial, which are the NodeMCU, DHT sensor, and blynk app.

What is NodeMCU?

The ESP8266 Integrates 802.11b/g/n HT40 a Wi-Fi transceiver, so it cannot only connect with a Wi-Fi network and interact with the Internet. It can also set up a network of its own, allowing other devices to connect directly to it. There’s an on-board voltage regulator that ensures the cleanest possible power to the NodeMCU itself, as well as a push-button reset and a USB connection for easy interface with your computer.

For more information regarding the NodeMCU, you can check my previous blog from here, you will get complete information regarding this tiny little board. Also, the board installation part I have mentioned in my other block, you can check out the blog through this link.

Before moving forward in this blog make sure that you should have these two blogs carefully because these blogs are basic but the most important key element of this whole process.

What is a DHT Sensor?

DHT11 is a low-cost digital sensor for sensing temperature and humidity. This sensor can easily interfaced with any microcontroller such as Arduino, Raspberry Pi, etc… to measure humidity and temperature instantaneously. DHT11 humidity and temperature sensor are available as a sensor and as a module. The difference between this sensor and module is the pull-up resistor and a power-on LED. DHT11 is a relative humidity sensor.

How it works? 

The working of the DHT sensor is pretty simple. DHT11 sensor consists of a capacitive humidity sensing element and a thermistor for sensing temperature. The humidity sensing capacitor has two electrodes with a moisture-holding substrate as a dielectric between them. Change in the capacitance value occurs with the change in humidity levels. The IC measure, process this changed resistance values and change them into digital form.

For measuring temperature this sensor uses a Negative Temperature coefficient thermistor, which causes a decrease in its resistance value with an increase in temperature. To get a larger resistance value even for the smallest change in temperature, this sensor is usually made up of semiconductor ceramics or polymers.

[caption id="attachment_642819" align="aligncenter" width="293"]DHT11 Temperature And Humidity Sensor Module                         DHT11 Sensor[/caption]

The temperature range of DHT11 is from 0 to 50 degrees Celsius with a 2-degree accuracy. The humidity range of this sensor is from 20 to 80% with 5% accuracy. The sampling rate of this sensor is 1Hz .i.e. it gives one reading for every second. DHT11 is small in size with an operating voltage from 3 to 5 volts. The maximum current used while measuring is 2.5mA.

Pinout of DHT sensor: 

[caption id="attachment_797646" align="aligncenter" width="342"]DHT-11-PINOUTS                              DHT-11-PINOUTS[/caption]

What is Blynk App And How it works?

Blynk was designed for the Internet of Things. It can control hardware remotely, it can display sensor data, it can store data, visualize it, and do many other cool things. Every time you press a Button in the Blynk app, the message travels to the Blynk Cloud, where it magically finds its way to your hardware. It works the same in the opposite direction and everything happens in a blynk of an eye.

There are three major components in the platform:

  • Blynk App - allows to you create amazing interfaces for your projects using various widgets we provide.

  • Blynk Server - responsible for all the communications between the smartphone and hardware. You can use our Blynk Cloud or run your private Blynk server locally. It’s open-source, could easily handle thousands of devices and can even be launched on a Raspberry Pi.

  • Blynk Libraries - for all the popular hardware platforms - enable communication with the server and process all the incoming and outcoming commands.

ok, now move towards action, first of all we will gonna see what hardware parts we will need, as in todays date we all have smartphone in our hand, so I m not gonna mention that you will need a samartphone and blynk app installed in it. basically we will need a

  1. Breadboard
  2. NodeMCU,
  3. DHT 11 sensor
  4. 5v power supply (you can also use your mobile charger)
  5. few jumper cables(male-male, male-female, female-female)
  6. micro USB (B- type) programming cable

In a software part we will need 

  1. Arduino IDE 
  2. Blynk Appilication

Application Installation and Configuration:

For installation of the blynk app, you need to follow these steps
Go to play store app store and type blynk, you will find the green color icon for the blynk app, then install it on your device.

[caption id="" align="aligncenter" width="263"]Blynk App                   Blynk App[/caption]
  • Sign up with a gmailid and then create a new project.
  • then click on create option and fill the details like project name, device used and connection type.

DHT11

  • Auth token will be generated this auth token you will get in the settings option of this project and on your Gmail Account.

Authtoken

  • Once your project is created, you have to insert different types of widget into it, For example I will be adding two buttons from widget box shown below.
[caption id="attachment_750054" align="aligncenter" width="324"]widgetBox widgetBox[/caption]
  • After selecting two Gauge click on the Settings Gauge and fill the details like i did in following image.
  • The guage I selected if for showing temperature and humidity 
[caption id="attachment_876714" align="aligncenter" width="304"]TemperatureGauge                     TemperatureGauge[/caption] [caption id="attachment_799080" align="aligncenter" width="285"]GaugeSetting                        GaugeSetting[/caption] [caption id="attachment_876712" align="aligncenter" width="285"]HumidityGauge              Humidity Gauge[/caption]
  • For Displaying all the data serially we use serial terminal
[caption id="attachment_799085" align="aligncenter" width="286"]SerialDisplay                             SerialDisplay[/caption] [caption id="attachment_799086" align="aligncenter" width="291"]SerialDisplay2                          SerialDisplay2[/caption]
  • After all the process with this settings your Dashboard will look appear like this.
[caption id="attachment_799093" align="aligncenter" width="286"]Dashboard                                Dashboard[/caption] [caption id="attachment_799095" align="aligncenter" width="299"]Dashboard                               Dashboard[/caption] [caption id="attachment_799112" align="aligncenter" width="296"]Dashboard                               Dashboard[/caption]
  • The board icon shown in brown circle has One Red Notification like symbol on it, because  the app is not connected with board for that you have to follow some steps.
  • First,  you have to open your blynk registered Gmail acc open the mail from blynk app which gives you AUTH token for your project"DHT11", copy that auth code to Auth type in the code box.
  • Insert your Hotspot ID password into your SSID and Password on your Arduino Sketch.

This is the complete process of installtion of BLYNK application and setting up the DHT project, Now we  will move towards coding part 

Coding Part 

Now I m gonna tell you all the installtion and coding part, So go with the following procedure step by Step: 

  1. Open the Arduino IDE 
  2. Install the NodeMCU board, installtion steps of this board given in my previous blog
  3. After following above blog, you need to install blynk library from Github, you can also visit the library from the following links:  Blynk Library, DHT sensor library.
  • We have installed DHT11 library in arduino , whereas we have added a widget "Terminal" for displaying a data on teaminal of blynk application. Data will be automatically update after a small time interval.
[caption id="attachment_876741" align="aligncenter" width="532"]SendSensor                                                  SendSensor[/caption]
  • We have added Sendsensor function to send the data from DHT11 Sensor to Blynk created widget, in this function "Blynk.virtualWrite(V5, h)", is used for sending humidity data on widget of Blynk app which is created on virtual terminal V5.
  • Here I have attached the final code
#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
#include <DHT.h>


char auth[] = "TB6KiXEXl----------qFo3Bp"; //you can add yout auth token 
char ssid[] = "sneha123";     // your Wifi name
char pass[] = "asdfghjkl";    // your wifi password


#define DHTPIN D1          // Digital pin D1
float  moisture; 
#define DHTTYPE DHT11     // DHT 11
int temp, Humid;
DHT dht(DHTPIN, DHTTYPE);
SimpleTimer timer;



WidgetTerminal terminal(V1);

BLYNK_WRITE(V1)
{
    terminal.write(param.getBuffer(), param.getLength());
    terminal.println();

  // Ensure everything is sent
  terminal.flush();
}

void sendSensor()
{
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit

  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V5, h);  //V5 is for Humidity
  Blynk.virtualWrite(V6, t);  //V6 is for Temperature

}

void setup()
{
  Serial.begin(9600); // See the connection status in Serial Monitor
  Blynk.begin(auth, ssid, pass);

  dht.begin();
  timer.setInterval(1000L, sendSensor);
  terminal.flush();
}

void loop()
{  
  
 
  temp = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
  Humid = dht.readHumidity();

  Serial.print("temp: ");
  Serial.print(temp);
  Serial.print(" c");  
  terminal.print("temp: ");
  terminal.print(temp);
  terminal.print(" c");
  Serial.print("    Humidity: ");
  Serial.print(Humid);
  Serial.println(" %");  
  terminal.print("  Humidity: ");
  terminal.print(Humid);
  terminal.println(" %");
  delay(300);

    

   terminal.flush();
     
  Blynk.run(); // Initiates Blynk
  timer.run(); // Initiates SimpleTimer
}
  • after coding part you have to make some simple connection of NodeMCU with DHT like shown in the image
[caption id="attachment_885807" align="alignnone" width="456"]DHT11_Interfacing                                             DHT11_Interfacing[/caption]
  • In the main function we have added a line "terminal.print()" is for printing a data on a serial terminal, After getting all the data your dashboard will be look like this,
[caption id="attachment_882694" align="alignnone" width="322"]FinalDashboard                               FinalDashboard[/caption]

So guys this is all about a simple IOT based blynk project. if you like this project you can also try to make it, it's very easy. If you find any difficulty please mention your query in comment section. 



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