Open Source WIFI Weather Station System.(ESP8266 connected to Blynk)

From Microduino Wiki
Jump to: navigation, search


  • Project: Open Source WIFI Weather Station System.(ESP8266 connected to Blynk)
  • Objective: To get temperature, humidity, light intensity and even PM2.5 data around you.
  • Difficulty: Medium
  • Project Time: 2 Hours
  • Creator: Ray


  • The station monitors temperature, humidity, light intensity and even PM2.5 (particulate matter) data around you.
  • Display the sensor data on the OLED screen.
  • The station can be synced with Blynk to upload sensor data.
  • Access the data anytime using the Blynk app.

Bill of Material

Microduino Equipment

Module Number Function
Microduino-Core+ 1 Core board
Microduino-USBTTL 1 Program download
Microduino-WIFI(ESP) 1 Internet connection
Microduino-Sensorhub 1 Sensor pin board
Microduino-Duo-h 1 Extension board
Microduino-OLED 1 Display
Sensor Number Function
Microduino-Temp&Hum 1 Digital temperature and humidity sensor
Microduino-Air Quality 1 Air quality detector
Microduino-Light 1 Light-sensitive sensor
GP2Y1010AU0F 1 PM2.5 sensor

Other Equipment

Equipment Number Function
Micro-USB cable 1 For program download and power supply
GP2Y1010AU0F 1 PM2.5 sensor
Screw 7 Fixate modules
Screwdriver 1 Fixate screws
Shell 1

Principle of the Experiment

This Weather Station collects the following:


Get and Configure Blynk

Next, we'll learn how Microduino interacts with Blynk through the configuration process of the Weather Station.

Getting Started with Blynk

Add Configuration Items

  • Scan the two-dimension code below to get Weather Station APP onto Blynk.
  • Also, you can make your own one.
  • In this case, you can click the panel and call out WIDGET BOX, on which you can see many choices.
  • Add Value Display item and name "temperature" to display Temperature value acquired.
  • Select V2 on INPUT; Choose PUSH on READING FREQUENCY, which indicates the temperature is sent from the Weather Station and the frequency is controlled by Microduino Client.

The corresponding code at the Microduino Client is:

void senTempHumi() {;
  float sensor_tem = am2321.temperature / 10.0;
  float sensor_hum = am2321.humidity / 10.0;
  Blynk.virtualWrite(V2, sensor_tem);
  Blynk.virtualWrite(V3, sensor_hum);

  oled(sensor_tem, sensor_hum, sensor_light, sensorPM25, Sensor_etoh); 
  • The setting of the humidity is similar with that of temperature; Set INPUT as V3 and send it through a timer function " senTempHumi()".

The frequency of the timer can be achieved by codes below:

void senTempHumi() {
  SimpleTimer temHumtimer;
  temHumtimer.setInterval(2000L, senTempHumi);
  • Set PM2.5's INPUT as V6, READING FREQUENCY as 5s, which represents frequency of the acquired PM2.5 data.

The corresponding code at the Microduino Client is:

  Blynk.virtualWrite(V6, sensorPM25);
  • Similarly, set the INPUT of the Light Sensor as V4 and the frequency is to get value every 3s.

The corresponding code at the Microduino Client is:

  sensor_light = map(analogRead(A0), 0, 1023, 0, 255);
  Blynk.virtualWrite(V4, sensor_light);
  • The INPUT of the methane gas is V5 and the frequency is to get value every 5s.

The corresponding code at the Microduino Client is:

  Sensor_etoh= map(analogRead(A2), 0, 1023, 0, 30);
  Blynk.virtualWrite(V5, Sensor_etoh);
  • See "Button Setting" next.
  • Set OUTPUT as V6 and MODE as SWITCH, meaning each time you press the button, you can switch electric level of the D6 pin at the Microduino Client.
  • For more intuitive data display, you can add one or more History Graph.
  • Can be set as data graph displaying V2 and V3. (can achieve four data display at most.)
  • The second History Graph can be used for displaying V6, PM2.5.
  • Finally, your phone panel turns into this:

Programming and Uploading

Weather Station Code: ESP8266BlynkWeatherStation

  • Stack the Microduino-Core+ and the Microduino-USBTTL together.
    • Connect the Microduino-USBTTL to your computer with the included MicroUSB cable.
    • Attention: Please upload program before stacking all modules together. As having the WiFi module connected will cause programming issues.

  • Follow the software setup guide for your OS at:
  • Once your software is successfully installed, open the software.
  • Configure the software to program the Core+ module:
    • Select Tools > Board > Microduino/mCookie-device (for Windows) or Tools > Board > Microduino/mCookie-Core+ (644pa) (for Mac OS).
    • Select Tools > Processor > Microduino/mCookie Core+ (644pa)@16M,5V (for Windows) or Tools > Board > Atmega644pa@16M,5V (for Mac OS).
    • Select Tools > Port (Usually what is selectable, if using Mac, it is not the Bluetooth one).

  • Download the code for Weather Station here:
  • Unzip the file. Under the software (Arduino IDE), go to File > Open... and navigate to the unzipped folder and open the ESP8266BlynkWeatherStation.ino file.
  • Click on the upload button (right arrow icon on the top left) to upload the program.
  • The program will compile and upload. Once completed a upload successful message will appear on the bottom left.

Hardware Buildup

  • Step2
    • Assemble Structure-B1~B5 with Structure-B6.
  • Step6
    • Complete the steps above, then fixate with Structure-B0 and plug in a USB cable. Congratulations! You just finished the buildup of the Weather Station.
  • Step7
    • You can see sensor data on Microduino-OLED after setting.
    • At the same time, you can also see uploaded data of the Weather Station on your phone Blynk.


  • Please make sure the verification code is configured right.
  • Make sure your router runs normally, the SSID and password are correct.