Introduction

This WiFi IoT module could be an excellent choice for IoT teaching and smart home projects. It supports for multiple programming platforms, such as MakeCode, Mind+ and Arduino IDE, and can also be used on various popular IoT platforms like Easy IoT, IFFTTT, ThingSpeak, ONENET, SIoT, BeeBotte. Besides that, the module is designed with easy-to-use Gravity interface and employs UART and I2C communication protocols. You can use it to build IoT applications with other mainboards like micro:bit, Arduino, STM32, etc.

Specification

Board Overview

No. Name Function
1 D/R Data Line(I2C)/Receiver(UART)
2 C/T Clock Line(I2C)/Transmitter(UART)
3 GND -
4 VCC +

Indicator Description

Indicator Color Status
Red Connection failed
Blue Connecting
Green Working Properly
Purple MQTT Disconnected

Programming on MakeCode

This part will be mainly introducing how to use WiFi IoT module and how to program it on MakeCode. About how to use MakeCode, click here.

MakeCode Platform and Program Library

Block Function Description

Block 1 Block 2 Block 3 Block 4

Tutorial

Project 1-Upload Data-UART

1-1. Introduction

Press down the button A on the micro:bit, the WiFi IoT module send a message "Hi, DFRobot" to Easy IoT via UART communication.

1-2. Preparation

MakeCode UART Library: https://github.com/DFRobot/pxt-DFRobot_WiFi_IoT_UART

  1. Open the Easy IoT website: http://iot.dfrobot.com, register an account if you don't have one, and then sign in.

4-1

  1. Click the icon to check the generated ID and Password, and fill them in the corresponding MQTT configuration blocks. Select server "Easy IoT_EN".

2

  1. Find your local WiFi and Password, fill them in the WiFi configuration block.

3

Connect the pin D/R, C/T, GND and VCC of the WiFi IoT module to P13, 14, GND and VCC of the IO expansion board respectively. You can also define them by programming. Connect them as follows.

1-3. Program Link

https://makecode.microbit.org/_gTjH91cbTTtt

1-4. Program Blocks

5

Note: please fill in the correct Easy IoT ID and password.

1-5. Effect Display

Since we use UART communication mode here, the control switch on the WiFi IOT module needs to be turned to the UART side, otherwise the initialization of the module will fail and the data transmission will not be possible.

After the program is burned successfully, the WiFi IOT module indicator will shows the connection process: red-blue-green. Press the button A on micro:bit, the WiFi IOT sends a "Hi DFRobot" message to the Easy IOT platform. Click "view details" in the position as shown in the figure below to enter the data page to see the received data.

7

9

Note: power the IO shield via USB when running the program.

Project 2-Upload Data-I2C

2-1. Introduction

Press down the button A on the micro:bit, the WiFi IoT module will send a message "Hi, DFRobot" to Easy IoT via I2C communication.

2-2. Preparation

https://github.com/DFRobot/pxt-DFRobot_WiFi_IoT_I2C

The platform configuration of project 1 can be directly used here.

2-3. Program Link

https://makecode.microbit.org/_FxkY6MLgmJ2M

2-4. Program Blocks

2-4

2-5. Effect Display

Since we use I2C communication mode here, the control switch on the WiFi IOT module needs to be turned to the I2C side, otherwise the initialization of the module will fail and the data transmission will not be possible.

3

Press down the button A on the micro:bit, the WiFi IoT module send a message "Hi, DFRobot" to Easy IoT platform.

4

From the two projects above, it can be seen that when we use UART or I2C, the fininal function is basically the same. However, I2C communication will not occupy the serial port, and more convenientto use. So we will use I2C in the later projects.

Project 3-Temperature and Brightness Remote Monitor(Based on Easy IoT)

3-1. Introduction

Use the micro:bit onboard temperature and light sensors to monitor environment. The WiFi IoT Module, micro:bit and Easy IoT server will be used for data exchange to realize remote monitoring of temperature and brightness based on IoT.

3-2. Preparation

MakeCode I2C library: https://github.com/DFRobot/pxt-DFRobot_WiFi_IoT_I2C

3-3. Program Link

https://makecode.microbit.org/_Pow1b0MKRVsm

3-4. Program Blocks

Project 3 blocks

3-5. Effect Display

Send data from IoT platform to micro:bit via WiFi module. When micro:bit received data "L", the micro:bit board displays the current brightness and upload it to the IoT platform; When the received data is "T", display the current temperature and upload it to the IoT platform. Refresh the page to view the uploaded messages.

3 4

Project 4-Sending Email (Based on IFTTT)

4-1. Introduction

Connect to IFTTT platform with the WiFi IoT module. When the button A on the micro:bit is pressed, a message recording the current temperature and light will be sent to IFTTT. In this way, we can send the current temperature and light value to the people we care about in real-time by email.

4-2. Preparation

MakeCode I2C Library: https://github.com/DFRobot/pxt-DFRobot_WiFi_IoT_I2C

  1. Enter IFTTT website, register an account if you don't have one. Then Sign in.

1-1

  1. The following interface will appear when you signed in.

1-2

  1. Click "Create" to enter the interface below.

1-3

  1. Click "if this" and input "webhooks" in the search bar.

1-4

1-5

  1. The following interface when entering for the first time, click "Receive a web request".

1-6

  1. Fill in the Event Name, then you have created this.(The event name can be defined by yourself).

1-7

  1. The webpage will return back automatically. Click "that" and select "Email".

1-8

  1. Click "Connect", fill in your emial address, and click "send PIN" to send a PIN code to your email box.

1-9

  1. Check your email to find the PIN code, and fill it in the webpage, then click "Connect".

1-10

  1. Click "Send me an Email" to set the email.

1-11

  1. You can write the content to be sent to your email box in the interface below, here we select the default one. Click "Create action".

1-12

  1. Enter the interface as follows.

1-13

  1. Check Password: click your avatar, click "My services".

1-14

  1. Click webhooks to enter the event created.

1-15

  1. Enter webhooks, click "Documentation" then the password can be seen.

1-16

1-17

1-18

4-3. Program Link

https://makecode.microbit.org/_6r9WkE7Lrfi9

4-4. Program Blocks

20

4-5. Effect Display

Press the button A on the micro:bit, the current temperature and light values will be detected and uploaded to IFTTT, and then forward to the mailbox you set.

21

Project 5-Sending Twitter (Based on IFTTT)

5-1. Introduction

This project demonstrates how to send a text message to twitter by pressing the button on micro:bit. You can extend this to other application scenarios according to this project, for instance, sending current water quality, air quality and other data to twitter.

5-2. Preparation

MakeCode I2C Libary Address: https://github.com/DFRobot/pxt-DFRobot_WiFi_IoT_I2C

In the last project, we have logged in the account on the computer. Next, we use the IFTTT app on the iPad to create events.

  1. Search IFTTT in your APP store and download it. Log in your IFTTT account.

1

  1. Click "Create", then the following interface will appear, click "Start".

5-2

  1. Click "This" to configure it.

5-3

  1. Search "Webhooks" in the search bar and click the result.

5-4

  1. Click "Receive a web request" to enter "create your own" setup, input your Event name, and click "Create trigger".

5-5

5-6

  1. It will return to the following page after clicking "Create trigger". Click "That" to configure it.

5-7

  1. Click that to enter the search page, search for twitter in the input box and click to enter the twitter settings. After entering, there are four options: post a tweet, post a tweet with image, update profile picture, and update bio. Here, we select post a tweet.

5-8

5-9

  1. Click "Add" in the interface below, and then fill in your twitter account and password in the pop-up box to add twitter account.

5-10

  1. Enter the interface below after the last step. Click "Create action", and then click "Finish".

5-11

5-12

5-3. Program Link

https://makecode.microbit.org/_8bpXa41DfTU7

5-4. Program Block

5-14

5-5. Effect Display

Press the button A on the micro:bit, send a twitter "Hi DFRobot 2020".

5-15

Project 6 Ambient Noise Analysis (based ThingSpeak)

6-1. Introduction

This project reads the data changes of the sound sensor, uploads them to thingspeak, and generates graphs for analyzing noise situation in the current environment, and then we can find the period with the most serious noise in a day.

6-2. Preparation

MakeCode I2C Library: https://github.com/DFRobot/pxt-DFRobot_WiFi_IoT_I2C

  1. Open ThingSpeak website, https://thingspeak.com/, click the right-upper corner to enter the register and login interface.

7-1

  1. When using for first time, register an account in the following interface. Fill in the correct email address and vertify the mail box.

7-2

7-3

  1. The following interface will appear after finishing the registeration.

7-4

  1. The above interface can also be found by clicking "Channels->My Channel". Now click new channel.

7-5

  1. Enter the interface below then.

7-6

  1. Here, we need to fill in the name, channel description, and tick the number of fields. In the makecode library, the fields are the same as the fields in the channel. In the routine, only the noise analog value is transferred to the channel. So only one is ticked here, and the field name can be customized. We modify the field name here as noise. Save the channel now. Here is the channel I created.

7-7

  1. After saving, the channel is created. The created channel is shown in the figure below, the parameters uploaded can be seen here.

7-8

  1. If more data needs to be uploaded, you need to click channel settings, click to enter the figure below, tick the "box" behind the field, and save it. You can also delete channel and clear channel data here.

7-9

  1. Channel added successfully.

7-10

  1. Click API Keys then we can see the related password of the channel. The password in the red box should be filled in the corresponding block in programming.

7-11

6-3. Program Link

https://makecode.microbit.org/_MA3LC6cYwRoH

6-4. Program Blocks

7-13

6-5. Effect Display

Check the uploaded data in private view of thingSpeak platform, the sound value read by analog sound sensor will be uploaded to IoT platform in real time, and displayed in the form of line graph.

7-14

Project 7-Alcohol concentration detector(Based on BeeBotte)

7-1. Introduction

Let's imagine, in the alcohol breath testing, if there is an alcohol concentration detector in a car that can upload the detected data to beebotte platform in real time, then the police only need to use the data on the platform to roughly judge whether there are people drinking in the current vehicle, and then check the vehicles with alcohol concentration over 800 (assuming that the alcohol concentration value exceeds 800 belongs to drunken driving). This can not only save time, but also greatly reduce the workload of traffic police.

7-2. Preparation

MakeCode I2C Library: https://github.com/DFRobot/pxt-DFRobot_WiFi_IoT_I2C

  1. Open BeeBotte website: https://beebotte.com/login. Register an account and log in.

8-1

  1. Enter the following interface when logged in. Click "Create New" to create a new channel.

8-2

  1. Write in the corresponding Channel name and resource according to the tip.

8-3

  1. Click "Create channel" to build up your own BeeBotte Channel.

8-4

  1. Check the channel token in the created channel of BeeBotte.

8-5

7-3. Program Link

https://makecode.microbit.org/_8PbTJAFPL2CH

7-4. Program Blocks

8-7

7-5. Effect Display

Check the alcohol concentration on the corredsponding channel in BeeBotte.

8-8

Turn the received data into line chart, table, etc

8-9

Programming on Arduino IDE

In this part, we will program the WiFi IoT module on Arduino IDE.

Project 1- Ambient Light Analysis -UART (Based on ThingSpeak)

Upload the detected light value to ThingSpeak via the UART communication of WiFi IoT module, and generate curve graph, then find the period with the most and least daylight in a day.

1-2. Preparation

Since we have registered the ThingSpeak account, here we only need to create a channel to receive the ambient light. The detailed way to do that, refer to project 7 above.

Connect the pin D/R, C/T, GND, VCC of the WiFi IoT module to the Pin D10, D11, GND and VCC of the Arduino IDE. The analog ambient light sensor goes to A0. You can also defin the related pins in programming.

1-3. Sample Code

#include "DFRobot_WiFi_IoT_Module.h"
    #include <SoftwareSerial.h>

    //UART mode
    //Use software serialport RX:10,TX:11
    SoftwareSerial    mySerial(10, 11);
    DFRobot_WiFi_IoT_Module_UART IoT (&mySerial);

    //Configure WiFi
    const char *WIFI_SSID             = "hitest";   //WiFi Name 
    const char *WIFI_PASSWORD         = "12345678";  //WiFi Password

    //Configure Thingspeak
    const char *ThingSpeak_ADDRESS    = "api.thingspeak.com";   //ThingSpeak address, not revise here 
    const char *THINGSPEAK_KEY        = "4I1G5SXC5PGU3HA4";  //Fill in the created event password on ThingSpeak  

    //Send Message to ThingSpeak
    const char *THINGSPEAK_VALUE_1    = "Value1";
    const char *THINGSPEAK_VALUE_2    = "Value2";
    const char *THINGSPEAK_VALUE_3    = "Value3";

    /*******************************************************
    Function:     getAmbient
    Description:  Get light sensor value 
    Params:
    Return:       current light value 
    ******************************************************/
    int getAmbient()
    {
      int val;
      val = analogRead(0);
      return val;
    }

    void setup() {
      //Use software serialport 9600 as communication port
      mySerial.begin(9600);

      //Use serialport 115200 as print port 
      Serial.begin(115200);

      //Init communication port 
      while(IoT.begin() != 0){  
        Serial.println("init ERROR!!!!");
        delay(100);
      }
      Serial.println("init Success");

      //Connect to WiFi
      while(IoT.connectWifi(WIFI_SSID, WIFI_PASSWORD) != 0){  
        Serial.print(".");
        delay(100);
      }
      Serial.println("Wifi Connect Success");

      while(IoT.HTTPBegin(ThingSpeak_ADDRESS) != 0){
        Serial.println("Parameter is empty!");
        delay(100);
      }
      Serial.println("HTTP Configuration Success");

      while(IoT.thingSpeakBegin(THINGSPEAK_KEY) != 0){
        Serial.print("Parameter is empty!");
        delay(100);
      }
      Serial.println("ThingSpeak Configuration Success");
    }

    void loop() {
      String data =(String)getAmbient();         
    //Upload current ambient light data to ThingSpeak every 1s
      IoT.thingSpeakSendMessage(data.c_str());  
      delay(1000);
    }

1-4. Upload the data detected by the analog ambient light sensor to ThingSpeak, and display them in an line chart.

1-1

Project 2-Ambient Noise Analysis (based ThingSpeak)

2-1. Introduction

Read the data changes of the sound sensor, upload them to ThingSpeak, and generates graphs for analyzing noise situation in the current environment, and then we can find the period with the most serious noise in a day.

2-2. Preparation

2-3. Sample Code

    #include "DFRobot_WiFi_IoT_Module.h"
    #include <SoftwareSerial.h>

    //I2C Mode 
    DFRobot_WiFi_IoT_Module_I2C IoT;

    //configure WiFi account and password 
    const char *WIFI_SSID             = "hitest";
    const char *WIFI_PASSWORD         = "12345678";

    //Configure ThingSpeak
    const char *ThingSpeak_ADDRESS    = "api.thingspeak.com";   //ThingSpeak address, do not need to revise here 
    const char *THINGSPEAK_KEY        = "RXARKPLSDMR3G8MA";  //Fill in the event password created on IFTTT 

    //Send message to ThingSpeak
    const char *THINGSPEAK_VALUE_1    = "Value1";
    const char *THINGSPEAK_VALUE_2    = "Value2";
    const char *THINGSPEAK_VALUE_3    = "Value3";

    /*******************************************************
    Function:     getNoise
    Description:  Get the value of sound sensor 
    Params:
    Return:       Current sound value 
    ******************************************************/
    int getNoise()
    {
      int val;
      val = analogRead(0);
      return val;
    }

    void setup() {  
      //use serialport 115200 as print port 
      Serial.begin(115200);

      //init communication port 
      while(IoT.begin() != 0){  
        Serial.println("init ERROR!!!!");
        delay(100);
      }
      Serial.println("init Success");

      //Connect to WiFi
      while(IoT.connectWifi(WIFI_SSID, WIFI_PASSWORD) != 0){  
        Serial.print(".");
        delay(100);
      }
      Serial.println("Wifi Connect Success");

      while(IoT.HTTPBegin(ThingSpeak_ADDRESS) != 0){
        Serial.println("Parameter is empty!");
        delay(100);
      }
      Serial.println("HTTP Configuration Success");

      while(IoT.thingSpeakBegin(THINGSPEAK_KEY) != 0){
        Serial.print("Parameter is empty!");
        delay(100);
      }
      Serial.println("ThingSpeak Configuration Success");
    }

    void loop() {
      String data =(String)getNoise();         
    //Upload current sound value to ThingSpeak every 1s 
      IoT.thingSpeakSendMessage(data.c_str());   
      delay(1000);
    }

2-4. Effect Display

Check the uploaded data in private view of thingSpeak platform, the sound value read by analog sound sensor will be uploaded to IoT platform in real time, and displayed in the form of line graph.

7-14

Project 3-Temperature Sending (Based on IFTTT)

3-1. Introduction

3-2. Preparation

3-3. Sample Code

    #include "DFRobot_WiFi_IoT_Module.h"
    #include <SoftwareSerial.h>

    int button = 7;

    //UART mode 
    //Use software serialport: D/R: 10, C/T: 11
    SoftwareSerial    mySerial(10, 11);
    DFRobot_WiFi_IoT_Module_UART IoT(&mySerial);


    //Configure WiFi name and password 
    const char *WIFI_SSID           = "hitest";
    const char *WIFI_PASSWORD       = "12345678";
    //Configure IFTTT
    const char *IFTTT_ADDRESS       = "maker.ifttt.com";
    const char *IFTTT_ENVENT        = "Temperature";
    const char *IFTTT_KEY           = "cdvP-sL1L9m3eld_T0xR3r";
    //IFTTT Send message 
    const char *IFTTT_VALUE_1       = "Value1";
    const char *IFTTT_VALUE_2       = "Value2";
    const char *IFTTT_VALUE_3       = "Value3";

    /********************************************************************************************
    Function    : getTemp
    Description : Get temperature detected by LM35
    Params      : 
    Return      : Converted temperature value 
    ********************************************************************************************/
    float getTemp()
    {
      uint16_t val;
      float dat;
      val = analogRead(A0);
      dat = (float)val * (5/10.24);
      return dat;
    }

    void setup() {
      //Use software serialport 9600 as communication port 
      mySerial.begin(9600);
      //Use serialport 115200 as print port 
      Serial.begin(115200);
      //Init communication port 
      while(IoT.begin() != 0){  
        Serial.println("init ERROR!!!!");
        delay(100);
      }
      Serial.println("init Success");
      //Connect to WiFi
      while(IoT.connectWifi(WIFI_SSID, WIFI_PASSWORD) != 0){  
        Serial.print(".");
        delay(100);
      }
      Serial.println("Wifi Connect Success");
      //Init HTTP
      while(IoT.HTTPBegin(IFTTT_ADDRESS) != 0){
        Serial.println("Parameter is empty!");
        delay(100);
      }
      Serial.println("HTTP Configuration Succeeded");
      //Init IFTTT
      while(IoT.IFTTTBegin(IFTTT_ENVENT, IFTTT_KEY) != 0){
        Serial.println("Parameter is empty!");
        delay(100);
      }
      Serial.println("IFTTT Configuration Succeeded");

      pinMode(button,INPUT);
    }

    void loop() {
      String data =(String)getTemp(); 
    //Press down button to send an Email recording the current temperature
      if(digitalRead(7) == 1)
      {
        IoT.IFTTTSendMessage("reminder","The current temperature is",data.c_str());
        Serial.println("send message success!");
      }
    }

3-4. Effect Display

Press down the button, IFTTT sends an Email recording the current temperature to the corresponding mail box.

Project 3 effect

Project 4-Smart Watering System (Based on Easy IoT)

4-1. Introduction

It is said that 80% of the plant growth problems are caused by untimely watering or excessive watering. We assume that the best soil moisture suitable for succulents growth is 100-300. When the soil moisture is less than or equal to 100, the plant will say, "Hi, I am thirsty, please give me water"; when the soil moisture is > = 300, the plant will say: "Hi, I am full, and don't need water now", so we can water the plants according to the needs of plants. If you can control watering remotely, you can event don't have to worry about the plants at home when going out for work for a long time.

4-2. Preparation

4-3. Sample Code

 #include "DFRobot_WiFi_IoT_Module.h"
    #include <SoftwareSerial.h>
    int Relay = 3;
    //I2C mode
    DFRobot_WiFi_IoT_Module_I2C IoT;

    //I2C mode 
    DFRobot_WiFi_IoT_Module_I2C IoT;

    //You can change them based on your needs 
    const char *WIFI_SSID           = "hitest";         //WiFi account 
    const char *WIFI_PASSWORD       = "12345678";           //WiFi password 

    //Easy IOT English configuration 
    //const char *EASY_IOT_SERVER        = "iot.dfrobot.com";

    //EASY IoT Chinese configuration 
    const char *EASY_IOT_SERVER     = "iot.dfrobot.com.cn";    //IoT host address, no need to revise here 
    const char *EASY_IOT_PORT       = "1883";                  //IoT connect port, no need to revise here 
    const char *EASY_IOT_ID         = "smofVJDMR";             //Iot_id, the account recorded when creating device 
    const char *EASY_IOT_PWD        = "ymoBVJvMgz";            //Iot_pwd, the password recorded when creating device 
    const char *SUBSCRIBE_TOPIC     = "9qnYVJDMR";             //Subscribe a device, device number “9qnYVJDMR”
    const char *PUBLISH_TOPIC       = "9qnYVJDMR";             //Send data to the device, device number “9qnYVJDMR”
    const char *EASY_IOT_SEND_MESSAGE    = "Send_Message";

    /********************************************************************************************
    Function    : callback
    Description : print the subscribed IoT device number and message 
    Params      : topic: subscribed device number; message: subscribed device number message 
    Return      : 
    ********************************************************************************************/
    String data = "0";
    void callback(const char*topic,const char*message)
    {
     Serial.println("Receive [ " + (String)topic + "]," + "Message : " + (String)message);
     data = (String)message;
    }

    /********************************************************************************************
    Function    : getSoilHumidity
    Description : Get soil humidity value 
    Params      : 
    Return      : Current soil humidity 
    ********************************************************************************************/
    float getSoilHumidity()
    {
      uint16_t val;
      val = analogRead(A0);
      return val;
    }

    void setup(void){ 
      Serial.begin(115200);
      //Init communication port 
      while(IoT.begin() != 0){  
        Serial.println("init ERROR!!!!");
        delay(100);
      }
      Serial.println("init Success");
      //Connect to WiFi
      while(IoT.connectWifi(WIFI_SSID, WIFI_PASSWORD) != 0){  
        Serial.print(".");
        delay(100);
      }
      Serial.println("Wifi Connect SUccess");
      //Init MQTT and connect to IoT platform 
      while(IoT.MQTTBegin(EASY_IOT_SERVER, EASY_IOT_PORT, EASY_IOT_ID, EASY_IOT_PWD) != 0){
        Serial.print(".");
        delay(100);
      }
      Serial.println("MQTT Connect Success");
      //call callback function 
      IoT.setCallBack(callback); 
      //subscribe device SUBSCRIBE_TOPIC
      while(IoT.subscribe(SUBSCRIBE_TOPIC) != 0){
        Serial.print(".");
        delay(100);
      }
      Serial.println("Subscribe Topic Success");

      pinMode(13, OUTPUT);         //Set Pin13 as output
      digitalWrite(13, HIGH);     //Set Pin13 High
      pinMode(Relay, OUTPUT);     //Set Pin3 as output
    }

    static long timestamp = millis();
    void loop(void){

    IoT.loop();
      //Received command "1" from Easy IoT, set relay to high 
      if(strcmp(data.c_str(),"1") == 0){ 
        digitalWrite(Relay, HIGH);
        data = "0";

      }
    IoT.loop();
      //Received command "2" from Easy IoT, set relay to low
      if(strcmp(data.c_str(),"2") == 0){
         digitalWrite(Relay, LOW); 
        data = "0";
      }
      if(millis()-timestamp>5000){
        timestamp = millis();
        int Hum = getSoilHumidity();
      //When current soil humidity Hum<=100, send the current humidity to Easy IoT
        if(Hum <= 100){
          IoT.publish(PUBLISH_TOPIC, (String)Hum);
        }
      //When current soil humidity Hum>=300, send the current humidity to Easy IoT
        if(Hum >= 300){
          IoT.publish(PUBLISH_TOPIC, (String)Hum); 
        }
      } 
    }

4-4. Effect Display

Upload the dectected soil moisture. The received message from Easy IoT is shown below:

4-1

Send command "1" from Easy IoT to water the plant(control the water pump by the relay module); command "2" for stopping watering.

Project 5-People Counting (Based on BeeBotte)

5-1. Introduction

Install a ultrasonic sensor at the entrance of a mall to count the number of people passing by, and send the statistics of people flow in a certian period to BeeBotte.

5-2. Preparation

5-3. Sample Code

#include "DFRobot_WiFi_IoT_Module.h"
#include <SoftwareSerial.h>

//I2C mode 
DFRobot_WiFi_IoT_Module_I2C IOT;

#define time(x) (x*1000)

//configure WiFi
const char *WIFI_SSID              = "hitest";
const char *WIFI_PASSWORD          = "12345678";
//configure Beebotte 
const char *BEEBOTTE_ADDRESS       = "api.beebotte.com";
const char *BEEBOTTE_TOKEN         = "token_PjXx9xPsygzy5GMU";
const char *BEEBOTTE_CHANNEL       = "Data";
const char *BEEBOTTE_RESOURCE      = "Data";

const char *BEEBOTTE_SEND_MESSAGE  = "Send_Message";

int TrgPin = A0;
int EcoPin = A1;
int dist;

static long timestamp = millis();
int count;

void setup(void){
  //Use 115200 as print port 
  Serial.begin(115200);
  //Init port 
  while(IOT.begin() != 0){  
    Serial.println("init ERROR!!!!");
    delay(100);
  }
  Serial.println("init Success");
  //Connect to WiFi
  while(IOT.connectWifi(WIFI_SSID, WIFI_PASSWORD) != 0){  
    Serial.print(".");
    delay(100);
  }
  Serial.println("Wifi Connect Success");
  //Init HTPP
  while(IOT.HTTPBegin(BEEBOTTE_ADDRESS) != 0){
    Serial.println("Parameter is empty!");
    delay(100);
  }
  Serial.println("HTTP Configuration Succeeded");
  //Init beebotte 
  while(IOT.beebotteBegin(BEEBOTTE_TOKEN) != 0){
    Serial.print("Parameter is empty!");
    delay(100);
  }
  Serial.println("Beebotte Configuration Succeeded");

  //Set TrgPin to output status 
  pinMode(TrgPin, OUTPUT);
  //Set EcoPin to input status 
  pinMode(EcoPin, INPUT);
}

//ultrasonic distance measurement 
int getDist(void)
{
  digitalWrite(TrgPin, LOW);
  delayMicroseconds(8);
  digitalWrite(TrgPin, HIGH);
  //Maintian high for 10ms to generate a pulse 
  delayMicroseconds(10);
  digitalWrite(TrgPin, LOW);
  //Read the pulse width and convert to distance 
  dist = pulseIn(EcoPin, HIGH) / 58;
  return dist;
}

void loop(void){
  if(getDist()<10){
    while(1){
      Serial.print("dist:");
      Serial.println(getDist());
      if(getDist()>30){
        count++;
        Serial.println(count);
        delay(100);
        break;  
      }
    }  
  }
  //Send the counted number every 10s, time(10)
  if(millis()-timestamp > time(10)){
    String data = (String)count;
    IOT.beebotteSendMessage(BEEBOTTE_CHANNEL, BEEBOTTE_RESOURCE,data.c_str());
    Serial.println(data.c_str());
    timestamp = millis();
    count = 0;
  }
}

5-4. Effect Display

Check the number of people in a certian period of time on BeeBotte Platform.

Result

Use with STM32

The WiFi IOT module can also be used with STM32 development board, and the functions achieved are the same. Here the details will be omitted. You can try it if you are interested.

WiFi IoT Module Library Address for STM32: https://github.com/DFRobot/DFRobot_WIFI_I0T_Module_STM32

#include "system.h"
#include "SysTick.h"
#include "led.h"
#include "usart.h"
#include "DFRobot_wifi_iot.h"

//wifi 
#define WIFISSID     "hitest"  //WiFi name 
#define WIFIPWS      "12345678" //wifi password 

//MQTT
//#define MQTT
#ifdef MQTT
#define SERVER        "iot.dfrobot.com.cn"  //server address 
#define PORT          "1883"                //Port number 
#define DEVICENAME    "rHpr0RcWR"           //User name 
#define DEVICESECRET  "9NtrAg5ZRz"          //User login password 
#define TOPIC         "OSpwrHHMg"           //Subscribe channel 
#endif

//IFTTT
#define IFTTT
#ifdef IFTTT
#define IFTTTKEY      "dtpfTlU3Wqa8y0HRh77xXE"
#define IFTTTEVENT    "BBB"
#endif

//ThingSpeak
//#define THINGSPEAK
#ifdef THINGSPEAK
#define THINGSPEAKKEY "U01NPZTC2G9WTDNY"
#endif

int main()
{
    u8 i=0;  
    SysTick_Init(72);
    NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);  
    LED_Init();
    //USB print port, corresponding pin: RX to PA10, TX to PA9
    USART1_Init(9600);
    //IOT communication port, corresponding pin: RX to PB11, TX to PB10
    USART3_Init(9600);
    //Connect to wifi
    connectWifi(WIFISSID,WIFIPWS);

    //Access EASYIOT
    #ifdef MQTT
    mqtt(SERVER,PORT,DEVICENAME,DEVICESECRET,TOPIC);
    #endif

    #ifdef IFTTT
    configIFTTT(IFTTTEVENT,IFTTTKEY);
    #endif

    #ifdef THINGSPEAK
    configThingSpeak(THINGSPEAKKEY);
    #endif
    while(1){

        #ifdef MQTT
        //send data shen using MQTT
        publish(TOPIC,"HI TANG");
        #endif
        #ifdef IFTTT
        //Access IFTTT, send messages to IFTTT registered event
        IFTTTSendMasage("100","78","78");
        #endif
        #ifdef THINGSPEAK
        //Access thingSpeak, send messages to ThingSpeak
        thingSpeakSendMasage("5000", "100");
        #endif
        i+=10;
        if(i%20==0)
        {
            i=0;
            led1=!led1;
        }

        delay_ms(100);
        loop();
    }
}

FAQ

For any questions, advice or cool ideas to share, please visit the DFRobot Forum.

More Documents

DFshopping_car1.png Get WiFi IoT Module from DFRobot Store or DFRobot Distributor.

Turn to the Top