Arduino Basics: IoT
Showing posts with label IoT. Show all posts
Showing posts with label IoT. Show all posts

27 March 2017

Hacking Robotic Arm using Controllino and Cayenne


 

Description

This tutorial will show you how to take over the controls of the OWI Robotic Arm with the help of an Arduino compatible, open-source PLC called the Controllino MAXI, together with Cayenne (my go-to iOT application for remote connection to my Arduino projects). The Controllino MAXI will provide the physical connections to the OWI robotic arm, and Cayenne will allow me to control the arm via my web browser or via the Cayenne app on my phone.


 

Arduino Libraries and IDE

  1. The Arduino IDE can be used to program the Controllino. You can dowload the Arduino IDE from here: https://www.arduino.cc/en/main/software.
  2. You will also need to read the Cayenne Ethernet library installation instructions in order to install the Cayenne Ethernet Library.
  3. The Controllino will connect to the internet via the Ethernet port onboard.
  4. You do not need the Controllino library for this project, however, if you have a Controllino, you might as well install the library. You can read the Controllino library installation instructions from their GitHub webpage here: https://github.com/CONTROLLINO-PLC/CONTROLLINO_Library.
  5. You will need to notify the Arduino IDE of the Controllino MAXI board by pasting the supplied URL into the "Additional Boards Manager URLs" in the Arduino IDE.

  6. This is located under: FILE - PREFERENCES - Additional Boards Manager URLs.
  7. The URL that you need to paste is in STEP 3 of the Controllino Library installation instructions on their GitHub page.
  8. The video at the top of this tutorial may help clarify the process.

 
 
 

ARDUINO CODE:

The code above is very simple, however you will need to create a dashboard of widgets from within your Cayenne account in order to control the OWI robotic Arm from your phone or via the Dashboard webpage.


 
 
 

Setting up Cayenne Dashboard

Once you have created your Cayenne account, you will be presented with a webpage to choose a board to connect to. Controllino is an Arduino compatible PLC, so make sure to follow these instructions for setting up the Controllino in your Cayenne Account.

  1. Select Arduino from the available list of boards.
  2. Make sure to install the necessary libraries if your have not done so already.
  3. Select Arduino MEGA from the avaliable list of Arduino boards
  4. Select Ethernet Shield W5100
  5. Copy and paste the Arduino code that pops up on screen into your Arduino IDE and upload to the Controllino.
  6. Alternatively, copy and paste the code from above, however you will need to insert your Authentication token to get it to work

After you upload the code to the Controllino, and providing it has an ethernet cable connected to the internet router (and has access to the internet), and is powered on, it will connect to your Cayenne Dashboard. You can now add widgets to the dashboard in real time to interact with the Controllino, and without uploading any more code to the open source PLC.


 
 

Adding Widgets

We need to add a number of widgets in order to activate the relays on the Controllino. The relavent digital pins that we will need to know about can be found on the Controllino website here: https://controllino.biz/downloads/.

Here is the direct link to the PINOUT file for the Controllino MAXI.

"Armed" with that knowledge, we can now create the widgets which are necessary to control the relays on the Controllino. From within the Cayenne dashboard, please follow these instructions to create a widget:

  1. Select - ADD NEW
  2. Select - DEVICE/WIDGET
  3. Select - ACTUATORS
  4. Then - RELAY from the dropdown box
  5. Select - RELAY SWITCH
  6. Give the widget a descriptive name to differentiate it from the other widgets and a name that is somewhat informative (eg. R0 - Pos)
  7. I gave the first widget the name "R0 - Pos", because it will connect to Relay R0, and that relay will be connected to the Positive (POS) terminal of the OWI robotic arm.
  8. Select the device you would like to connect to. Be aware that you can change the name of the device in the settings. If you followed this tutorial, it should have the name "Arduino MEGA", but I changed the name of the device to "Controllino" to be more accurate.
  9. We will be using a digital pin to control the relay, therefore select "Digital" as the Connectivity option
  10. For this specific widget, we will be controlling R0, which is activated by digital pin D22 on the Controllino. Therefore select "D22" from the "Pin" dropdown box.
  11. Choose a "Button" as the widget type
  12. Choose an icon from the dropdown box that makes sense to you
  13. Skip Step 1
  14. Select Step 2: Add actuator

You should now see your new widget on the dashboard. Select the widget to enable or activate that relay. If you do this, and if everything goes to plan, you will see the LED for R0 illuminate on the Controllino. You now have to add the rest of the widgets to the dashboard in order to control the rest of the relays on the Controllino.


 
 

Widget Dashboard

Here is a table to show you how I setup my dashboard.


 
 
 

Fritzing diagram


 
 

OWI Robotic Arm Pins


 
 

Normal OWI Robotic Arm Circuit

The following circuit diagram will show you how the wired control box is normally connected to the OWI Robotic arm. This is the circuit diagram of the OWI robotic arm under normal operating contidtions.


 
 

OWI Robotic Arm Circuit when connected to Controllino

The following circuit diagram will show you how the OWI Robotic Arm will be controlled by the relays of the Controllino. This is the circuit diagram of the OWI robotic arm when it is connected to the Controllino.


 
 

All connected

The OWI Robotic Arm is connected to a breadboard using the female-to-male jumper wires. Solid core wire is then fed through to the relay terminals of the Controllino. You could just wire it up so that the robotic arm is connected directly to the Controllino, however, I did not have the right connectors for this purpose.
The Controllino is also connected to my internet router via a normal RJ-45 ethernet cable, and is powered by a 12V DC power adapter.


 
 

Summary

Now that you have all the physical connections made, uploaded the code to the Controllino, and have created your dashboard in Cayenne, you should be able to control your OWI Robotic arm from anywhere in the world. As demonstrated in the video at the start of this tutorial, the robotic arm has quite a bit of give on each of the joints, which makes it difficult to achieve certain tasks that require an element of precision. There goes that idea of being able to perform surgery with this thing !!! At least you can get it to make you a cup of tea, and if you are patient enough, you might even get a grape once in a while.

Thank you to Controllino and Cayenne for making this tutorial possible. If you would like your product featured in my tutorials, please contact me on my contact page.


 
 


 
 
 
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Follow me on Twitter by looking for ScottC @ArduinoBasics.
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Have a look at my videos on my YouTube channel.

6 December 2016

Garage Door Monitor with Cayenne


 

Description

Using the HMC5883L magnetometer sensor of the GY-80 module from ICStation to monitor a garage door and notify when it has been opened or closed. The Cayenne service provides much of the monitoring and notifying functionality. A major feature of this project. Cayenne takes care of all of the complicated work behind the scenes, making it easy to connect your Arduino to the cloud and allow you to monitor your garage from virtually anywhere.
 
This project was created specifically to monitor a garage, but you will soon discover that this project could be used to monitor a whole host of other things. Monitor your front door, your back door, your bag, your chair, your cookie jar.
 
Monitor for peace of mind, or catch someone in the act of stealing your stuff. This project has got you covered. Let's see how:


 

 
 

HMC5883L DataSheet:

You can find the datasheet for the HMC5883L pretty easily by searching on the internet.
HMC5883L datasheet - Sparkfun


 

Arduino Libraries and IDE

Here is a link to the Arduino IDE download. The IDE is required to upload code to the Seeeduino Cloud.

You need the Cayenne Library installed in your Arduino IDE.
You can find the Cayenne library here:
Cayenne Libarary
 
There are libraries on the internet for the GY-80 module, however, it is relatively easy to use the magnetometer on this module. And therefore no libraries are required for the sensor. If you would like some more information about using the magnetometer sensor, and how to get the most out of it, then please have a look at my previous tutorial which goes into much more detail.


 

ARDUINO CODE:


 

You need to make sure to insert your OWN Cayenne token into the sketch above. You will get this token when connecting your Arduino to the Cayenne service. Watch the video for further explanation.


 

Fritzing diagram

Cayenne Widgets

Please make sure to watch the video to see how to connect the Seeeduino Cloud to Cayenne and how to create the Cayenne widgets. Cayenne widgets are necessary to create the dashboard on your phone or browser. They will also interact with the Arduino sketch, and will also be involved in creating the notification system. The following links will take you to the relevant part of the video:

The Master switch button is used to switch monitoring from OFF to ON (and vice versa). Therefore you can choose when to monitor the garage and when to stop monitoring. When first installing the project onto your garage door, and turning the Seeeduino Cloud on, it will automatically calibrate each sensor to a value of 1000.
 
If you experience any drift away from 1000 for whatever reason, simply press the Request calibration button, and each sensor will be recalibrated back to 1000. The x,y and z axis widgets are there so that you can see the readings coming from the magnetometer sensor. And when any of the axis variables breach the threshold away from 1000, it will trigger the Door Status widget. This is how we can tell if the door is open or closed.
 
We also use the Door Status widget to help with the notification system. When the Door status changes from "Closed" to "Open", a notification trigger will be activated, and a message will be sent via email or SMS. This notification is useful for monitoring when the door was opened. If you happen to recalibrate when the door is open. You will get a notification when the garage door closes.


 

Concluding comments

This project is relatively simple, and quite easy to set up. What I liked about this project was the versatility and alternate uses. You can use the same setup to monitor many different things. It is not just limited to monitoring a garage door. But being able to tell whether my garage door is opened or closed, especially after I have driven away from my house , is really cool. Now I don't have to drive all the way back home to check. Let me know if you have replicated this project, and also what kinds of things you decided to monitor with this project.

28 February 2015

Weather Reporter - Temboo, Ethernet and Arduino


 

Arduino is well known for the large variety of sensors / modules that can be connected. It is quite easy to hook up a temperature or humidity sensor to get instant feedback about the surrounding environmental conditions. However, sometimes you do not have a temperature sensor. Sometimes you have a sensor, but would like to know the temperature in other cities ! Or you would like to know what the temperature will be tomorrow?

Well now you can !!

All you need is a Temboo account, an internet connection and the following components:

Parts Required


 
 

Project Description


An Arduino UNO (and Ethernet Shield) queries Yahoo using a Temboo account, and retrieves weather information. The data is filtered and processed, and then passed on to another Arduino UNO to be displayed on a TFT LCD module. Two Arduino UNOs are used because the Ethernet library and the UTFT library are both memory hungry, and together consume more memory than one Arduino UNO can handle.
Yes - I could have used a different board such as the Arduino MEGA, but where is the fun in that ??
This project will teach you many things:
  • How to use an Ethernet Shield with a Temboo account to retrieve internet data
  • How to use a TFT LCD module (ITDB02-1.8SP)
  • How to reduce memory consumption when using the UTFT library
  • How to power two Arduinos with a single USB cable
  • How to transmit data from one Arduino to another (via jumper wires)
All of this and a whole lot more !!


 
 

Video

Have a look at the following video to see the project in action.
 




You will need to create a Temboo account to run this project:

Temboo Account Creation


Step 1:

Visit the Temboo website : https://www.temboo.com/
Create an account by entering a valid email address.
Then click on the Sign Up button.

 

 

Step 2:

Verify your email address by clicking on the link provided in the email sent by Temboo.

 

Step 3:

You will be directed to the account setup page:
Create an Account Name, and Password for future access to your Temboo Account
Check the terms of service and if you agree, then tick the box
Press the Go! button

 

 

Step 4:

You will then encounter the "Welcome!" screen:

 

 

Step 5:

Navigate to the top right of the screen and select the LIBRARY tab

 

 

Step 6:

On the left hand side you will see a list of choreos.
Type Yahoo into the search box on the top left of the screen.
Navigate to the GetWeatherByAddress Choreo by clicking on...
    Yahoo _ Weather _ GetWeatherByAddress

 

 

Step 7:

Turn the IoT Mode to ON (in the top right of screen)

 

 

Step 8:

What's your platform / device? : Arduino
How is it connected? : Arduino Ethernet
 
The following popup box will appear:

 

 

Step 9:

Name: EthernetShield - you can choose any name. Letters and numbers only. No spaces.
Shield Type: Arduino Ethernet
MAC Address : You can normally find the MAC address of the Ethernet shield on the underside.
Enter the MAC address without the hyphens. Then click SAVE.

 

 

Step 10:

Move to the INPUT section.
Enter the Address of the place you want the Temperature for.
Address = Perth, Western Australia
Expand the Optional INPUT for extra functionality
Units = c - If you want the temperature in Celcius.

 

 

Step 11:

This will automatically generate some Arduino CODE and a HEADER FILE.
Don't worry about the Arduino code for now... because I will provide that for you.
However, you will need the automatically generated HEADER file. I will show you what to do with that soon.
So don't lose it !'



Temboo Library Install

The Temboo library will need to be installed before you copy the Arduino code in the sections below.
To install the Temboo library into your Arduino IDE, please follow the link to their instructions:
  Installing the Temboo Arduino Library

 
 

UTFT Library Install

Download the UTFT library from this site: http://www.henningkarlsen.com/electronics/library.php?id=51
Once downloaded and extracted. Go into the UTFT folder and look for the memorysaver.h file. Open this file in a text editor, and "uncomment" all of the TFT modules that are not relevant to this project. I disabled all of the TFT modules except the last 3 (which made reference to ST7735) - see picture below. The TFT module we are using in this project is the ITDB02-1.8SP from ITEAD Studio.
Save the memorysaver.h file, and then IMPORT the library into the Arduino IDE as per the normal library import procedure.
 
If you do not modify the memorysaver.h file, the Arduino SLAVE sketch will not compile.

 
 

Arduino Code (MASTER)

 
This project uses 2 Arduino UNOs.
One will be the Master, and one will be the Slave.
The following code is for the Arduino MASTER.
 
Open up the Arduino IDE.
(I am using Arduino IDE version 1.6)
Paste the following code into the Arduino IDE code window.
 
PLEASE NOTE: You may need to change some of the lines to accomodate your INPUTS from step 10.
Have a look around line 36 and 37.
 
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/* ===============================================================================
      Project: Weather Reporter: Temboo, Ethernet, Arduino
        Title: ARDUINO MASTER: Get temperature from Yahoo using Temboo
       Author: Scott C
      Created: 27th February 2015
  Arduino IDE: 1.6.0
      Website: http://arduinobasics.blogspot.com/p/arduino-basics-projects-page.html
  Description: The following sketch was designed for the Arduino MASTER device. 
               It will retrieve temperature/weather information from Yahoo using your
               Temboo account (https://www.temboo.com/), which will then be sent to the
               Arduino Slave device to be displayed on a TFT LCD module.
               
   Libraries : Ethernet Library (that comes with Arduino IDE)
               Temboo Arduino Library - https://www.temboo.com/sdk/arduino
               
   Temboo Library installation instructions for Arduino: 
               https://www.temboo.com/arduino/others/library-installation

  You will also need to copy your Temboo Account information into a new tab and call it TembooAccount.h.
  Please follow the instructions on the ArduinoBasics blog for more information.
---------------------------------------------------------------------------------- */

#include <SPI.h>
#include <Dhcp.h>
#include <Dns.h>
#include <Ethernet.h>
#include <EthernetClient.h>
#include <Temboo.h>
#include "TembooAccount.h" // Contains Temboo account information - in a new tab.
#include <Wire.h>

byte ethernetMACAddress[] = ETHERNET_SHIELD_MAC;   //ETHERNET_SHIELD_MAC variable located in TembooAccount.h
EthernetClient client;

String Address = "Perth, Western Australia";     // Find temperature for Perth, Western Australia
String Units = "c";                              // Display the temperature in degrees Celcius

String ForeCastDay[7];                           //String Array to hold the day of the week              
String ForeCastTemp[7];                          //String Array to hold the temperature for that day of week.

int counter1=0;                                  //Counters used in FOR-LOOPS.
int counter2=0;

boolean downloadTemp = true;                     // A boolean variable which controls when to query Yahoo for Temperature information.



void setup() {
  Wire.begin();           // join i2c bus : Used to communicate to the Arduino SLAVE device. 
 
  // Ethernet shield must initialise properly to continue with sketch.
  if (Ethernet.begin(ethernetMACAddress) == 0) {
    while(true);
  }
  
  //Provide some time to get both Arduino's ready for Temperature Query.
    delay(2000);
}




void loop() {
  if (downloadTemp) {
    downloadTemp=false;     //Stop Arduino from Querying Temboo repeatedly
    getTemperature();       //Retrieve Temperature data from Yahoo
    transmitResults();      //Transmit the temperature results to the Slave Arduino
  }
}




/* This function will Query Yahoo for Temperature information (using a Temboo account) */

void getTemperature(){
    TembooChoreo GetWeatherByAddressChoreo(client);

    // Invoke the Temboo client
    GetWeatherByAddressChoreo.begin();

    // Set Temboo account credentials
    GetWeatherByAddressChoreo.setAccountName(TEMBOO_ACCOUNT);        //TEMBOO_ACCOUNT variable can be found in TembooAccount.h file or tab
    GetWeatherByAddressChoreo.setAppKeyName(TEMBOO_APP_KEY_NAME);    //TEMBOO_APP_KEY_NAME variable can be found in TembooAccount.h file or tab
    GetWeatherByAddressChoreo.setAppKey(TEMBOO_APP_KEY);             //TEMBOO_APP_KEY variable can be found in TembooAccount.h file or tab

    // Set Choreo inputs
    GetWeatherByAddressChoreo.addInput("Units", Units);              // Set the Units to Celcius
    GetWeatherByAddressChoreo.addInput("Address", Address);          // Set the Weather Location to Perth, Western Australia

    // Identify the Choreo to run
    GetWeatherByAddressChoreo.setChoreo("/Library/Yahoo/Weather/GetWeatherByAddress");

    // This output filter will extract the expected temperature for today
    GetWeatherByAddressChoreo.addOutputFilter("Temperature", "/rss/channel/item/yweather:condition/@temp", "Response");
    
    // These output filters will extract the forecasted temperatures (we need to know the day and temperature for that day)
    GetWeatherByAddressChoreo.addOutputFilter("ForeCastDay", "/rss/channel/item/yweather:forecast/@day", "Response");
    GetWeatherByAddressChoreo.addOutputFilter("ForeCastHigh", "/rss/channel/item/yweather:forecast/@high", "Response");

    // Run the Choreo; 
    GetWeatherByAddressChoreo.run();

    //Reset our counters before proceeding
    counter1 = 0;
    counter2 = 0;
    
    while(GetWeatherByAddressChoreo.available()) {
      // This will get the first part of the output
      String name = GetWeatherByAddressChoreo.readStringUntil('\x1F');
      name.trim(); // get rid of newlines

      // This will get the second part of the output
      String data = GetWeatherByAddressChoreo.readStringUntil('\x1E');
      data.trim(); // get rid of newlines

      //Fill the String Arrays with the Temperature/Weather data
      if (name == "Temperature") {
        ForeCastDay[counter1] = "Today";
        ForeCastTemp[counter2] = data;
        counter1++;
        counter2++;
      }
      
      if(name=="ForeCastDay"){
        ForeCastDay[counter1] = data;
        counter1++;
      }
      
      if(name=="ForeCastHigh"){
        ForeCastTemp[counter2] = data;
        counter2++;
      }
    }
  
    //Close the connection to Temboo website
    GetWeatherByAddressChoreo.close();
  }
  
  
  
  
  /* This function is used to transmit the temperature data to the Slave Arduino */
  
  void transmitResults(){
    char tempData[10];
    int tempStringLength = 0;
    
    //Modify the current temp to "Now"
    ForeCastDay[0] = "Now";
    
    //Send * to Slave Arduino to prepare for Temperature Transmission
    Wire.beginTransmission(4);  // Transmit to device #4  (Slave Arduino)
    Wire.write("*");
    delay(500);
    Wire.endTransmission();
    delay(500);
    
    //Send the temperatures on the Slave Arduino to be displayed on the TFT module.
    for (int j=0; j<20; j++){
      for (int i=0; i<6; i++){
        memset(tempData,0,sizeof(tempData));   //Clear the character array
        String tempString = String(ForeCastDay[i] + "," + ForeCastTemp[i] + ".");
        tempStringLength = tempString.length();
        tempString.toCharArray(tempData, tempStringLength+1);
        Wire.beginTransmission(4);  // Transmit to device #4  (Slave Arduino)
        Wire.write(tempData);
        delay(1000);
        Wire.endTransmission();
        delay(4000);
      }
    }
    
    /* ----------------------------------------------------------------------
    // You can use this to send temperature results to the Serial Monitor.
    // However, you will need a Serial.begin(9600); statement in setup().
    
    Serial.println("The Current Temperature is " + ForeCastTemp[5] + " C");
    Serial.println();
    Serial.println("The Expected Temperature for");
    for (int i=0; i<5; i++){
      Serial.println(ForeCastDay[i] + " : " + ForeCastTemp[i] + " C");
    }
    ---------------------------------------------------------- */
  }
  
    
    
 
 
 
Select "New Tab" from the drop-down menu on the top right of the IDE.
Name the file: TembooAccount.h

Paste the contents of the HEADER file from the Temboo webpage (Step 11 above) into the TembooAccount.h tab. If you do not have the TembooAccount.h tab with the contents of this HEADER file next to your Arduino Master sketch, then it will NOT work.
 
Make sure to SAVE the Arduino Sketch and upload the code to the Arduino (MASTER)

 
 

Arduino Code (SLAVE)

 
This project uses 2 Arduino UNOs.
One will be the Master, and one will be the Slave.
The following code is for the Arduino SLAVE.
 
Make sure to disconnect the Arduino MASTER from your computer, and keep it to one side. Connect the Arduino SLAVE to your computer, and upload the following code to it. Make sure to create a new sketch for this code (File _ New).
 
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/* ===============================================================================
      Project: Weather Reporter: Temboo, Ethernet, Arduino
        Title: ARDUINO SLAVE: Display temperature on TFT LCD Module
       Author: Scott C
      Created: 27th February 2015
  Arduino IDE: 1.6.0
      Website: http://arduinobasics.blogspot.com/p/arduino-basics-projects-page.html
  Description: The following sketch was designed for the Arduino SLAVE device. 
               It will receive temperature information from the Arduino MASTER
               and then display this information on the ITDB02-1.8SP TFT LCD 
               Module. Please read the important notes below.

----------------------------------------------------------------------------------
NOTES:
This sketch makes use of the UTFT.h library from : 
http://www.henningkarlsen.com/electronics/library.php?id=51
Please note: You will need to modify the memorysaver.h file in the UTFT folder 
with a text editor to disable any unused TFT modules. This will save memory, 
and allow you to run this sketch on an Arduino UNO. I disabled all TFT modules in
that file except the last 3 (which made reference to ST7735).
I used a ITDB02-1.8SP TFT LCD Module from ITEAD Studio.
PinOut:

Arduino SLAVE      ITDB02-1.8SP TFT
         3.3V ---- VDD33
 Digital9 (D9)---- CS
 Digital8 (D8)---- SCL
 Digital7 (D7)---- SDA
 Digital6 (D6)---- RS
 Digital5 (D5)---- RST
          GND ---- GND
           5V ---- VIN

Usage: UTFT myGLCD(<model code>, SDA, SCL, CS, RST, RS);
Example: UTFT myGLCD(ITDB18SP,7,8,9,5,6);

-----------------------------------------------------------------------------------
This sketch also makes use of the Wire.h library. 
The Wire.h library comes with the Arduino IDE.
This enables communication between Arduino Master and Arduino Slave.
PinOut:

Arduino MASTER      Arduino SLAVE
   Analog4(A4) ---- Analog4 (A4) 
   Analog5(A5) ---- Analog5 (A5) 
           GND ---- GND

-----------------------------------------------------------------------------------
The Arduino Slave is powered by the Arduino Master:
PinOut:

Arduino MASTER      Arduino SLAVE
            5V ---- VIN

==================================================================================
*/

#include <UTFT.h>
#include <Wire.h>

//Declare all of the fonts
extern uint8_t SmallFont[];
extern uint8_t BigFont[];
extern uint8_t SevenSegNumFont[];

// Usage: UTFT myGLCD(<model code>, SDA, SCL, CS, RST, RS);
UTFT myGLCD(ITDB18SP,7,8,9,5,6);

boolean tempDisplay = false;  //Helps with processing the data from the Arduino MASTER
boolean readTemp = false;      //Helps to differentiate the day from the temperature values
String dayOfWeek="";          //Variable used to hold the Day of the Week
String tempReading="";        //Variable used to hold the Temperature for that day

String Units = "'C ";         //Display Temperature in Celcius
String Address = "Perth, WA"; //Address to show at top of Display


void setup(){
  // Initialise the TFT LCD
  myGLCD.InitLCD();
  initialiseLCD();
  delay(5000);
  
  //Setup the Serial communication between the Arduino MASTER and SLAVE
  Wire.begin(4);                // join i2c bus with address #4
  Wire.onReceive(receiveEvent); // register event
}



void loop(){
  delay(50);
}


/*
  This function initialises the TFT LCD, and draws the initial screen.
*/
void initialiseLCD(){
  //Clear the screen
  myGLCD.clrScr();
  
  //Draw the borders (top and bottom)
  myGLCD.setColor(25, 35, 4);
  myGLCD.fillRect(0, 0, 159, 13);
  myGLCD.fillRect(0, 114, 159, 127);
  myGLCD.drawLine(0,18,159,18);
  myGLCD.drawLine(0,109,159,109);
  
  //Header and Footer Writing
  myGLCD.setColor(255, 255, 255);
  myGLCD.setBackColor(25, 35, 4);
  myGLCD.setFont(SmallFont);
  myGLCD.print("arduinobasics", CENTER, 1);
  myGLCD.print("blogspot.com", CENTER, 114);
}




/* This function executes whenever data is received from Arduino master
   It will ignore all data from the Master until it receives a '*' character.
   Once this character is received, it will call the receiveTemp() function
   in order to receive Temperature data from the Arduino Master.
*/
void receiveEvent(int howMany){
  if(tempDisplay){
    receiveTemp();
  }else{
    while(0 < Wire.available()){
      char c = Wire.read();       // receive byte as a character
      if(c=='*'){                 // Searching for a '*' character
        tempDisplay=true;         // If '*' received, then call receiveTemp() function
      }
    }
  }
}



/* This function is used to receive and process the Temperature data 
   from the Arduino Master and pass it on to the  displayTemp() funtion.
*/
void receiveTemp(){
  tempReading="";
  dayOfWeek = "";
  
  while(0 < Wire.available()){
    char c = Wire.read(); // receive byte as a character
    if(readTemp){
      if(c=='.'){         // If a . is detected. It is the end of the line.
        readTemp=false;
      }else{
        tempReading=tempReading+c;
      }
    }else{
      if(c==','){
      } else {
        dayOfWeek=dayOfWeek+c;
      }
    }
    if(c==','){
      readTemp=true;
    }
  }
  displayTemp();
}



/*
  Display the Temperature readings on the TFT LCD screen.
*/
void displayTemp(){
  //Clear the writing on top and bottom of screen
  myGLCD.setColor(25, 35, 4);
  myGLCD.fillRect(0, 0, 159, 13);
  myGLCD.fillRect(0, 114, 159, 127);
  
  //Small writing on top and bottom of screen
  myGLCD.setColor(255, 255, 255);
  myGLCD.setBackColor(25, 35, 4);
  myGLCD.setFont(SmallFont);
  myGLCD.print(Address, CENTER, 1);
  myGLCD.print(dayOfWeek, CENTER, 114);
  
  //Write the big temperature reading in middle of screen
  myGLCD.setBackColor(0, 0, 0);
  myGLCD.setFont(SevenSegNumFont);
  myGLCD.print(tempReading, CENTER, 40);
  
  //Write the Units next to the temperature reading
  myGLCD.setFont(BigFont);
  myGLCD.print(Units, RIGHT, 40);
}
    
    
 
 
 

Wiring it up

Once the code has been uploaded to both Arduinos (Master and Slave), I tend to label each Arduino so that I don't mix them up. You will notice an 'S' marked on the SLAVE in some of the photos/videos. Then it is time to piggy-back the shields onto the Arduinos and wire them up. Make sure you disconnect the USB cable from the Arduinos before you start doing this.

 

Step 1: Ethernet Shield

Place the Ethernet shield onto the Arduino MASTER.
Connect an Ethernet cable (RJ45) to the Ethernet shield. The other end will connect to your internet router.

 
 

Step 2: Arduino SLAVE and TFT LCD module

 
You can either wire up the TFT LCD module on a breadboard, or you can use a ProtoShield with mini-breadboard. It doesn't really matter how you hook it up, but make sure you double check the connections and the TFT specifications before you power it up. I have powered the Arduino Slave by connecting it to the Arduino Master (see fritzing sketch below).
 
There is no reason why you couldn't just power the slave seperately. In fact this is probably the safer option. But I read that this power-sharing setup was ok, so I wanted to give it a go. I have no idea whether it would be suitable for a long term power project... so use it at your own risk. I tried using 4 x AA batteries to power this circuit, but found that the LCD screen would flicker. So then I tried a 9V battery, and noticed that the 5V voltage regulator was heating up more than I felt comfortable with. In the end, I settled with the USB option, and had no further issues. I am sure there are other possible options, and feel free to mention them in the comments below.
 
Use the following fritzing sketch and tables to help you wire this circuit up.

 

Fritzing sketch

 

 
 

 

Arduino MASTER to SLAVE connection table

 

 
 

 

Arduino SLAVE to ITDB02-1.8SP TFT LCD

 

 
 

ITDB02-1.8SP TFT LCD Module Pictures

 

 

 
 

Project Pictures

 

 

 

 



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