Temperature and Humidity Web Server for ESP8266 DHT11/DHT22 with Arduino IDE
DHT11/DHT22 with Arduino IDE In this project, you'll use the Arduino IDE to turn an ESP8266 into a stand- alone web server that shows the temperature and humidity with a DHT11 or DHT22 se…
Know the mission before touching a wire.
Understand what you are making, prepare the right tools, and make the workbench safe.
Project details
Temperature and Humidity Web Server for ESP8266 DHT11/DHT22 with Arduino IDE is a iot project. DHT11/DHT22 with Arduino IDE In this project, you'll use the Arduino IDE to turn an ESP8266 into a stand- alone web server that shows the temperature and humidity with a DHT11 or DHT22 se…
- Source pages
- 1027-1031
- Named parts
- 6
- Build goal
- Working, tested prototype
Tools you need
- Digital multimeter
- Wire stripper and side cutters
- Soldering iron with a fine tip
- Current-limited bench supply
- Computer with a data-capable USB cable
Use eye protection, good lighting, and a clean insulated surface throughout the build.
Safety precautions
- Disconnect every power source before changing a connection.
- Check component polarity, pinout, and supply voltage twice.
- Use a current limit for the first power-up.
- Keep liquids, loose metal, and uninsulated wires away from the bench.
Gather, identify, and understand every part.
Use the standardized inventory, then open What's this? to learn each part's role, advantages, limitations, handling, and specifications.
What's this?Image, role, pros, cons, handling & specifications
ESP8266 development board (read ESP8266 development boards
A programmable controller that reads inputs, makes decisions, and drives the project's outputs.
What it does hereIt is the control centre and must use the documented board, pin map, supply, and logic level.
Buy / compare this part ↗Advantages
- Reprogrammable and reusable
- Large learning ecosystem
- Complex behaviour remains changeable
Limitations
- GPIO voltage and current are limited
- Some pins affect boot or communication
- Loads normally need a driver
Handling
- Disconnect power before rewiring
- Avoid static discharge
- Never power motors, relays, or pumps directly from GPIO
Specifications to verify
- Use the exact model, value, package, and rating listed for ESP8266 development board (read ESP8266 development boards; similar-looking parts are not always interchangeable.
- Confirm operating voltage, logic level, pinout, memory, USB interface, and maximum GPIO current.
What's this?Image, role, pros, cons, handling & specifications
comparison)
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for comparison); similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
Breadboard with either a DHT22 or DHT11 Temperature and
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for Breadboard with either a DHT22 or DHT11 Temperature and; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
MODULE LEARNING VIEWHumidity Sensor and a 4.7k Ohm Resistor
A sensor converts a physical condition into an electrical signal the circuit can measure.
What it does hereIt provides project input as an analogue, digital, resistive, frequency, or calibrated signal.
Buy / compare this part ↗Advantages
- Adds real-world awareness
- Can usually be tested independently
- Often supports calibration
Limitations
- Readings can drift
- Placement affects results
- Some sensors need warm-up or calibration
Handling
- Protect the sensing surface
- Observe supply voltage and polarity
- Keep signal leads away from noisy power wiring
Specifications to verify
- Use the exact model, value, package, and rating listed for Humidity Sensor and a 4.7k Ohm Resistor; similar-looking parts are not always interchangeable.
- Confirm supply range, output type, measurement range, accuracy, response time, and pin order.
What's this?Image, role, pros, cons, handling & specifications
A set of jumper wires
A named project component whose exact role is defined by the source circuit and build guide.
What it does hereIt performs a documented electrical, control, interface, or construction function in this project.
Buy / compare this part ↗Advantages
- Selected for this project
- Can be checked independently
- Supports modular troubleshooting
Limitations
- Substitutes may differ
- Generic names can hide variants
- Pinouts and ratings vary
Handling
- Compare the received part with the source
- Keep it labelled
- Do not force connectors or adjusters
Specifications to verify
- Use the exact model, value, package, and rating listed for A set of jumper wires; similar-looking parts are not always interchangeable.
- Confirm dimensions, ratings, connection method, polarity, and environmental limits.
What's this?Image, role, pros, cons, handling & specifications
ESP8266 with DHT11/DHT22 Schematic Diagram
A programmable controller that reads inputs, makes decisions, and drives the project's outputs.
What it does hereIt is the control centre and must use the documented board, pin map, supply, and logic level.
Buy / compare this part ↗Advantages
- Reprogrammable and reusable
- Large learning ecosystem
- Complex behaviour remains changeable
Limitations
- GPIO voltage and current are limited
- Some pins affect boot or communication
- Loads normally need a driver
Handling
- Disconnect power before rewiring
- Avoid static discharge
- Never power motors, relays, or pumps directly from GPIO
Specifications to verify
- Use the exact model, value, package, and rating listed for ESP8266 with DHT11/DHT22 Schematic Diagram; similar-looking parts are not always interchangeable.
- Confirm operating voltage, logic level, pinout, memory, USB interface, and maximum GPIO current.
Connect one verified path at a time.
Explore the named components and standardized signal flow, then use Source Check to verify exact physical pins, values, and topology before applying power.
Trace this circuit.
Temperature and Humidity Web Server for ESP8266 DHT11/DHT22 with Arduino IDE: interactive parts, standardized terminals, responsive anchored wires, student explanations, and the original circuit reference in one shared system.
Trace before wiring
Follow power, ground, inputs, processing, and outputs in that order. Never guess a pin from package shape alone.
Connect with power off
Make short, labelled connections and share a common ground only where the schematic requires it.
Inspect every joint
Check continuity, polarity, adjacent shorts, and loose connections before the first power-up.
Open all source diagrams and build views 4 visuals
Confirm the hardware-only control path.
This project does not include firmware in the source. The circuit itself provides the required behaviour.
How to connect
- Match every controller label to the circuit view and source pin map.
- Join grounds before signal wires when separate low-voltage supplies are used.
- Keep motors, relays, pumps, and other loads on a suitable driver and external supply.
Common mistakes
Reversed VCC/GND, board-label versus GPIO-number confusion, missing common ground, and charge-only USB cables.
Troubleshoot
Disconnect loads, continuity-test one path at a time, then test with a current limit.
Software preparation
No IDE, board package, library, or firmware upload is required for this project.
If you add a programmable controller as an extension, document its pin map separately.
How to upload code
The original design is implemented entirely in hardware, so proceed after verifying the circuit and supply.
Assemble, deploy, test, and troubleshoot.
Use the complete source notes in build order, then pass the final checks before calling the project finished.
Build in functional stages
- Power and regulation
- Controller or processing stage
- Inputs and sensors
- Outputs and loads
- Enclosure and strain relief
Power up safely
- Inspect unpowered continuity first
- Apply the lowest safe current limit
- Measure supply rails before signals
- Add one load at a time
- Record expected and actual results
Work from simple to complex
- Confirm power, ground, polarity, and orientation
- Compare each pin with the source
- Test inputs separately from outputs
- Replace only one variable at a time
- Power off before every correction
Follow the documented instructions.
These notes come from this project's source and remain in their original order.
Project overview
Project build noteDHT11/DHT22 with Arduino IDE In this project, you'll use the Arduino IDE to turn an ESP8266 into a stand- alone web server that shows the temperature and humidity with a DHT11 or DHT22 sensor. You will be able to access the web server that you will develop using any device that is connected to your local network and has a browser installed on it. Throughout the course of this guide, we will demonstrate how to construct
two distinct web servers, namely
Project build noteWeb Server #1 is an asynchronous web server that automatically refreshes the website with the current temperature and humidity readings without the need for the user to do so. This web server also uses custom CSS to decorate the page. Web Server #2 is a basic HTTP web server that updates a raw HTML page with the most recent sensor values whenever the page is refreshed. This web server only supports HTTP.
Component Required
Project build noteESP8266 development board (read ESP8266 development boards comparison) Breadboard with either a DHT22 or DHT11 Temperature and Humidity Sensor and a 4.7k Ohm Resistor A set of jumper wires ESP8266 with DHT11/DHT22 Schematic Diagram
Before continuing with the lesson, ensure that the temperature and humidity sensor, either a DHT11 or DHT22, is connected to the ESP8266 in the manner depicted in the following schematic diagram.
In this demonstration, the DHT data pin is connected to GPIO5 (D1); however, you are free to use any other GPIO that is appropriate. Learn more about the GPIOs available on the ESP8266 by consulting our ESP8266 GPIO Reference Guide. As the previous diagram demonstrates, the GPIO 2 pin on an ESP-01 is the one that is best suited for making the connection to the data pin on a DHT sensor.
Demonstration
Project build noteEnter the IP address of the ESP8266 into a browser on your local network and proceed to step 2. The following web page, which contains the most recent sensor readings, ought to be displayed.
It is not necessary to reload the web page in order to view the most recent measurements for both the temperature and the humidity because they are automatically updated every ten seconds.
You built Temperature and Humidity Web Server for ESP8266 DHT11/DHT22 with Arduino IDE.
You followed the full workflow from understanding the mission to testing the finished project. That is a real engineering achievement - well done.
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