Motion Controlled LED Lamp

This Motional Controlled LED Lamp changes color as you place your hand through the ring. It includes 5-second shutoff option.

1 Arduino Nano

1 HC-SR04 Ultrasonic Motion Sensor

1 12V power adapter

3 Transistors (2N3904FS)

3 Resistors (330 Ohm)

RGB LED strip

Hook-up wires

1 soldering breadboard (optional)

Create a ring shape for the lamp. I utilized Autodesk Fusion 360 and made a 12" diameter lamp stand.

Now's for the fun part, writing the code!

For this project I needed two libraries: Timers and SR04 (Ultrasonic Distance sensor)

SR04 file are attached.

#include "Timer.h"
Timer timer;


#define Green 9
#define Red 10
#define Blue 11
const int NumPatterns = 8; //This can change depending on how many color patterns you want
int CurrentPattern = 1;
unsigned long myTime;


#include "SR04.h"
#define TRIG_PIN 5
#define ECHO_PIN 6
SR04 sr04 = SR04(ECHO_PIN,TRIG_PIN);
long mydist;


int limit=20; //Set to the diameter of the ring 
int offwait = 3000;  //How long of wait until the lamp turns off


//-------------------------------------------------------------------------------
void setup() {
Serial.begin(9600);
pinMode(Green, OUTPUT);
pinMode(Red,OUTPUT);
pinMode(Blue,OUTPUT);
pinMode(test,OUTPUT);
}

Up next is the main loop

void loop() {   
   mydist=sr04.Distance);
   Serial.println(mydist);  //Debugging to serial monitor
if (mydist <20){
CurrentPattern += 1;
//Serial.println(CurrentPattern);
}


if (CurrentPattern > NumPatterns){ //I only have 8 NumPatterns, so this resets the pattern back to 1
  CurrentPattern = 1;
} 

//Depending upon what CurrentPattern stores, one of the following functions will activate
if (CurrentPattern ==1){ 
WhiteON();}
else if (CurrentPattern ==2){
  RedON();}
  else if (CurrentPattern==3){
    BlueON();
  }
    else if (CurrentPattern==4){
    GreenON();
  }  else if (CurrentPattern==5){
    PurpleON();
  }  else if (CurrentPattern==6){
    OrangeON();
  }  else if (CurrentPattern==7){
    YellowON();
  }  else if (CurrentPattern==8){
    AllOff();
  }

//This controls the override turn-off function
timer.start();
while(mydist<limit){
 
   mydist=sr04.Distance();
  if(timer.read()>offwait){
    CurrentPattern=8;
    AllOff();
    timer.stop();
    }
  delay(100);
  }
 delay(1000);
 }

Here's the specific functions. These are fairly simple, just going through the various RGB combinations, but not doing any other mixing, blending, or looping

void RedON() {
  digitalWrite(Red,HIGH);
  digitalWrite(Green,LOW);
  digitalWrite(Blue,LOW);
}

void GreenON() {
  digitalWrite(Red,LOW);
  digitalWrite(Green,HIGH);
  digitalWrite(Blue,LOW);
}

void BlueON() {
  digitalWrite(Red,LOW);
  digitalWrite(Green,LOW);
  digitalWrite(Blue,HIGH);
}

void PurpleON() {
  digitalWrite(Red,HIGH);
  digitalWrite(Green,LOW);
  digitalWrite(Blue,HIGH);
}

void YellowON() {
  digitalWrite(Red,HIGH);
  digitalWrite(Green,HIGH);
  digitalWrite(Blue,LOW);
}

void OrangeON() {
  digitalWrite(Red,LOW);
  digitalWrite(Green,HIGH);
  digitalWrite(Blue,HIGH);
}

void WhiteON() {
  digitalWrite(Red,HIGH);
  digitalWrite(Green,HIGH);
  digitalWrite(Blue,HIGH);
}

void AllOff() {
  digitalWrite(Red,LOW);
  digitalWrite(Green,LOW);
  digitalWrite(Blue,LOW);
}

I utilized a soldering breadboard to make a permanent connection for the circuit components, though you could make use of a solderless breadboard. All electronics are stored in the bottom part of the ring lamp, shown here.