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Follow Me Light

Made by electrouser1294 / Home Automation

About the project

use wifi singnal make light can auto on/off when you near it or leave.

Project info

Difficulty: Easy

Platforms: Microchip

Estimated time: 2 days

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

	Avr-iot Wg Evaluation Board	x 1
	LinkIt 7697	x 1
	Polymer Lithium Ion Battery - 1000mAh	x 2
	LED - Basic Red 3mm	x 1
	Resistor 330 Ohm 1/6th Watt PTH	x 2
	Transistor NPN (2N3904)	x 1

Software apps and online services

arduino ide

Hand tools and fabrication machines

soldering iron

x 1

Story

This is using Wi-fi version. The BLE version has proposed on the other web site. Most of this article is the same as BLE version

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

Microchip AVR-IoT WG Development Board as remote switch use OOB demo firmware.

Linkit 7697 control LED lamp. Firmware program by Arduino IDE.

First, let AVR-IoT WG into Wi-Fi AP mode (hold SW0 when power on). Then Linkit 7697 work as Wi-Fi client keeps scan AP. Once it finds AVR-IoT WG and RSSI is big enough. 7697 turn on the LED lamp. While AVR-IoT WG turns off Wi-Fi AP off or leaves the room 7697 turns off the lamp.

Connection

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

Operation video

Schematics, diagrams and documents

Simple Sch

Code

Follow_light_device

use hardware link 7697

// modified from example ScanNetworks
#include <LWiFi.h>
int losecnt;
int havedevice;
int led0 = 7;
int percnt;
int mathbuf;

int scanRSSI;
void setup() {
	//Initialize serial and wait for port to open:
	Serial.begin(115200);
  pinMode(led0, OUTPUT);
  
	// check for the presence of the shield:
	if (WiFi.status() == WL_NO_SHIELD) {
		Serial.println("WiFi shield not present");
		// don't continue:
		while (true);
	}

	String fv = WiFi.firmwareVersion();
	if (fv != "1.1.0") {
		Serial.println("Please upgrade the firmware");
	}

	// Print WiFi MAC address:
	printMacAddress();
}

void loop() {
	// scan for existing networks:
	listNetworks();
	delay(1000);
}

void printMacAddress() {
	// the MAC address of your Wifi shield
	byte mac[6];

	// print your MAC address:
	WiFi.macAddress(mac);
	Serial.print("MAC: ");
	Serial.print(mac[5], HEX);
	Serial.print(":");
	Serial.print(mac[4], HEX);
	Serial.print(":");
	Serial.print(mac[3], HEX);
	Serial.print(":");
	Serial.print(mac[2], HEX);
	Serial.print(":");
	Serial.print(mac[1], HEX);
	Serial.print(":");
	Serial.println(mac[0], HEX);
}

void listNetworks() {
	// scan for nearby networks:
	Serial.println("** Scan Networks **");
	int numSsid = WiFi.scanNetworks();
	if (numSsid == -1) {
		Serial.println("Couldn't get a wifi connection");
		while (true);
	}

	// print the list of networks seen:
	Serial.print("number of available networks:");
	Serial.println(numSsid);

	// print the network number and name for each network found:
	for (int thisNet = 0; thisNet < numSsid; thisNet++) 
	{
    const String name = WiFi.SSID(thisNet); //formate trans for compare
    scanRSSI = WiFi.RSSI(thisNet);
    if(name=="MCHP.IOT"&& scanRSSI>-50)
    {
      havedevice=1;
      digitalWrite(led0,HIGH);
      Serial.println("havedevice");
    }
	}
  if(havedevice==1)
  {
    losecnt=0;
    havedevice=0;
  }
  else
  {
    losecnt++;
    Serial.println("losecnt++");
  }
  if(losecnt>5)
  {
    losecnt=0;
    digitalWrite(led0,LOW);
    Serial.print("Lose Device");
    Serial.println();
  }
  
}

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About the project

Project info