Published October 29, 2024 © GPL3+

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Use Bluetooth to control LED lighting. That you don't worry about forgetting where is the wall switch and if you close it when you leave the

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Smart Home/Smart Building

Revolutionize Your IoT Prototyping

Things used in this project

Hardware components

NXP Rapid IoT Prototyping Kit

LinkIt 7697

General Purpose Transistor NPN

Resistor 1k ohm

Li-Ion Battery 1000mAh

LED LAMP

Software apps and online services

Arduino IDE

Story

Idea

I was lying in bed exhausted, I found that the lights were still on, but I didn't bother to get up and switch it.

I walked into the dark room and the lights were off. I have to find the switch in dark.

Hence I wanna have a wireless switch that can help me turn on/off light.

Hardware and Software

Rapid IoT Prototyping Kit as remote switch use OOB demo firmware.

Linkit 7697 control LED lamp. Firmware program by Arduino IDE. The keyword below.

 if(name=="PAF6D"&&scanRSSI>-80)//BLE device name
 {
   digitalWrite(led0,HIGH);
 }

When Linkit 7697 work as BLE central keep scan device. Once it find Rapid IoT Prototyping Kit (my kit device name "PAF6D") and RSSI is big enough. 7697 turn on LED lamp. While Rapid IoT Prototyping Kit turn off BLE off or leave the room 7697 turn off lamp.

Connection

Since Linkit 7697 is 3V3 device and IO drive current not enough, need transistor of MOS circuit to switch LED.

Operation video

Code

led_central

#include <LBLE.h>
#include <LBLECentral.h>

LBLEClient client;

int losecnt;
int led0 = 7;
int percnt;
int mathbuf;
int scanRSSI;
void setup() {
  //Initialize serial
  Serial.begin(115200);
  pinMode(led0, OUTPUT);#include <LBLE.h>
#include <LBLECentral.h>

LBLEClient client;

int losecnt;
int havedevice;
int led0 = 7;
int percnt;
int mathbuf;
int scanRSSI;
void setup() {
  //Initialize serial
  Serial.begin(115200);
  pinMode(led0, OUTPUT);
  // Initialize BLE subsystem
  Serial.println("BLE begin");
  LBLE.begin();
  while (!LBLE.ready()) {
    delay(10);
  }
  Serial.println("BLE ready");
}

void printDeviceInfo(int i) {
  Serial.print(i);
  Serial.print("\t");
  Serial.print(LBLECentral.getAddress(i));
  Serial.print("\t");
  Serial.print(LBLECentral.getAdvertisementFlag(i), HEX);
  Serial.print("\t");
  scanRSSI = LBLECentral.getRSSI(i);
  Serial.print(scanRSSI);
  Serial.print("\t");
  const String name = LBLECentral.getName(i);
  Serial.print(name);
  if(name=="PAF6D"&&scanRSSI>-80)
  {
    havedevice=1;
    digitalWrite(led0,HIGH);
  }
  
  if(name.length() == 0)
  {
    Serial.print("(Unknown)");
  }
  Serial.print(" by ");
  const String manu = LBLECentral.getManufacturer(i);
  Serial.print(manu);
  Serial.print(", service: ");
  
  if (!LBLECentral.getServiceUuid(i).isEmpty()) {
    Serial.print(LBLECentral.getServiceUuid(i));

  } else {
    Serial.print("(no service info)");
  }
  Serial.println();
}

void loop() {
  static LBLEAddress serverAddress;
      LBLECentral.scan();
      delay(1000);
      LBLECentral.stopScan();


      // enumerate advertisements found.
      Serial.print("Peripherals found = ");
      Serial.println(LBLECentral.getPeripheralCount());
      Serial.println("idx\taddress\t\t\tflag\tRSSI");
      percnt = LBLECentral.getPeripheralCount();

      if(percnt == 0)
      {

        losecnt++;
      }
      else
      {

        for (int i = 0; i < percnt; ++i) 
        {
          printDeviceInfo(i);
        }
        if(havedevice==1)
        {
          losecnt=0;
          havedevice=0;
        }
        else
        {
          losecnt++;
        }
      }
      Serial.print("LoseCnt:");
      Serial.print(losecnt);
      Serial.println();

      if(losecnt>5)
      {
        losecnt=0;
        digitalWrite(led0,LOW);
        Serial.print("Lose Device");
        Serial.println();
      }


}

Credits

Wen-Liang Lin

29 projects • 35 followers

Hi, I am momososo

Comments

Awards

Smart Home/Smart Building

Revolutionize Your IoT Prototyping

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