Dan Tudose
Published © GPL3+

IoT Christmas Tree

Build your own IoT-enabled Christmas tree with the Sparrow Wireless Sensor Nodes!

IntermediateFull instructions provided2 hours372
IoT Christmas Tree

Things used in this project

Hardware components

Sparrow Wireless Sensor Nodes
×5

Software apps and online services

Arduino IDE
Arduino IDE

Story

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Code

The Nodes

Arduino
Program each node with the code below
#include "SparrowTransfer.h" 
#define NODEADDR 8 //this should be unique for each node (range 0-254) 
SparrowTransfer ST;  
struct RECEIVE_DATA_STRUCTURE{ 
 //put your variable definitions here for the data you want to send 
 //THIS MUST BE EXACTLY THE SAME ON THE OTHER ARDUINO 
 uint8_t address; 
 uint8_t red; 
 uint8_t green; 
 uint8_t blue; 
}; 
//give a name to the group of data 
RECEIVE_DATA_STRUCTURE mydata; 
// Variables will change: 
int ledState = LOW;             // ledState used to set the LED 
unsigned long previousMillis = 0;        // will store last time LED was updated 
unsigned long currentMillis = 0; 
// the follow variables is a long because the time, measured in miliseconds, 
// will quickly become a bigger number than can be stored in an int. 
long interval = 1000;           // interval at which to blink (milliseconds) 
// pins for the LEDs: 
const int redPin = 8; 
const int greenPin = 11; 
const int bluePin = 10; 
int red = 0xFF;   //variables to store the current color intensity for each channel 
int green = 0xFF; //the LED works on reverse logic, so writing a 0x00 will completely turn on the respective LED  
int blue = 0xFF;  //we start with all LEDs off 
uint8_t address = NODEADDR; 
void setup() { 
 // initialize serial: 
 Serial.begin(9600); 
 // make the pins outputs: 
 pinMode(redPin, OUTPUT); 
 pinMode(greenPin, OUTPUT); 
 pinMode(bluePin, OUTPUT); 
 //start the library, pass in the data details 
 ST.begin(details(mydata)); 
} 
void ledColor(byte red, byte green, byte blue) //sets the color of the RGB led on the sparrow node 
{ 
 analogWrite(redPin, red); 
 analogWrite(greenPin, green); 
 analogWrite(bluePin, blue); 
} 
void BlinkLED() //makes the led blink witohut using the delay() function 
{ 
 currentMillis = millis(); 
 if(currentMillis - previousMillis > interval) { 
 // save the last time you blinked the LED 
 previousMillis = currentMillis;   
 // if the LED is off turn it on and vice-versa: 
 if (ledState == LOW) 
 { 
    ledState = HIGH; 
    ledColor(0xFF, 0xFF, 0xFF); //turn the LED off 
 } 
 else 
 { 
   ledState = LOW; 
   ledColor(red, green, blue);  // write the current color 
 } 
} 
} 
void loop() { 
   if(address == NODEADDR || address == 0xFF) //we use 0xFF as a broadcast address 
     BlinkLED();                              //all nodes will change their color when receiving address 0xFF 
   if(ST.receiveData()){ //if a new data packet arrived, alter the current color of the LED 
     if(mydata.address == NODEADDR || mydata.address == 0xFF) 
     { 
       address = mydata.address; 
       red = mydata.red; 
       green = mydata.green; 
       blue = mydata.blue; 
     } 
   } 
} 

The Coordinator Node

Arduino
#include "SparrowTransfer.h" 
//create object 
SparrowTransfer ST;  
int red, green, blue, address; 
struct SEND_DATA_STRUCTURE{ 
 //put your variable definitions here for the data you want to send 
 //THIS MUST BE EXACTLY THE SAME ON THE OTHER ARDUINO 
 uint8_t address; 
 uint8_t red; 
 uint8_t green; 
 uint8_t blue; 
}; 
//give a name to the group of data 
SEND_DATA_STRUCTURE mydata; 
void setup() { 
 // initialize serial: 
 Serial.begin(9600); 
 //start the library, pass in the data details 
 ST.begin(details(mydata)); 
} 
void loop() { 
   while (Serial.available() > 0) { //data packets should arrive in csv format, ended by a '\n' 
   address = Serial.parseInt(); // first value should be the node address 
   red = Serial.parseInt();     // get the value for the red channel 
   green = Serial.parseInt();   // get the value for the green channel 
   blue = Serial.parseInt();    // last value should be the blue channel 
   // look for the newline. That's the end of a packet 
   if (Serial.read() == '\n') { 
     // constrain the values to 0 - 255 and invert because our LED is a common-cathode one 
     red = 255 - constrain(red, 0, 255); 
     green = 255 - constrain(green, 0, 255); 
     blue = 255 - constrain(blue, 0, 255); 
     mydata.address = address; 
     mydata.red = red; 
     mydata.green = green; 
     mydata.blue = blue; 
     ST.sendData(); //resend the packet a few times, just to make sure it gets through
     delay(100); 
     ST.sendData(); 
     delay(100); 
     ST.sendData(); 
     delay(100); 
     ST.sendData(); 
     delay(100); 
     ST.sendData(); 
     delay(100); 
     // print the three numbers in one string as hexadecimal: 
     Serial.print(address, HEX); 
     Serial.print(red, HEX); 
     Serial.print(green, HEX); 
     Serial.println(blue, HEX); 
   } 
 } 
 }  

Credits

Dan Tudose

Dan Tudose

5 projects • 31 followers

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