Published November 8, 2020 © CC BY-NC-SA

Touch Switches for Home

Smart Home

IntermediateFull instructions provided2 hours2,288

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board

Seeed Studio Grove - 2-Channel SPDT Relay

Adafruit Capacitive Touch Sensor Breakout - MPR121

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)

Story

Hello everyone,

Today I am going to make touch switches that can be installed easily at our houses. Recently I got these ttp223 capacitive touch switches I decided to try them out.

They can be used in a lot of ways. so I decided to use them in my home instead of traditional switches.

I collected all stuff needed for this project

2 5v relays that can handle 7A of current.
2 power supply HLK-PM01 which was a 5v3w supply and the other was hlk-5m05 which was 5v5w power supply. I choose the 3w one, due to its small size. Iof soldered it on a piece of PCB with a screw connector.
For the controller side, I have two options an Arduino or a nodeMCU. I choose nodeMCU because up-gradation of it in near future will be easy.

With just a magic trick a soldered everything up. A circuit for this will be available on my website.

I designed a PCB for this using Altium but that is still incomplete due to the unavailability of components so I went to the web and found this.

This is an IoT board from an Indian company rhydolabz.com who manufactures these boards in Kerala.

it contains everything we want but in a well-designed manner. I have the esp8266 wifi chip directly installed no it. in order to program it, we need a programmer.

You can check out their website for more stuff.

I soldered touch switches onto them and programmed it for the same.

For checking it I hooked up two AC LED bulbs. The circuit for this will also be available on my website. One bulb is connected to the first relay and the second other to thesecond one.

AC power must also be given to the Board. The best thing about this is no additional power supply is needed for powering the board.

Then I powered and board the LEDs lighted up.

I tried touching the touch switches and it worked really fine. I tested it for a while and then decided to fit inside the switchboard.

I stuck the touch switches to the back of blank switch plates. and fitted it inside the board. Kindly be careful while doing this you can take help from your parents for this.

and here is the result. SEE YouTube Video

SO thank you for reading and have a nice day.

Code

Touch Switches by RoboCircuits

#include <EEPROM.h>

void ICACHE_RAM_ATTR button1();
void ICACHE_RAM_ATTR button2();

boolean buttonState1 = false, buttonState2 = false,

void button1()
{
  delayMicroseconds(100000);
  if(digitalRead(in1)==HIGH)                                     
  {
    buttonState1 =! buttonState1;
    digitalWrite(relay1,buttonState1);
    delayMicroseconds(200000);
    EEPROM.write(101,buttonState1);
    EEPROM.commit();
  }
}

void button2()
{
  delayMicroseconds(100000);
  if(digitalRead(in2)==HIGH)                                 
  {
    buttonState2 =! buttonState2;
    digitalWrite(relay2,buttonState2);
    delayMicroseconds(200000);
    EEPROM.write(102,buttonState2);
    EEPROM.commit();
  }
}

void setup()
{
  EEPROM.begin(512);
  Serial.begin(115200);
  pinMode(relay1,OUTPUT);
  pinMode(relay2,OUTPUT);
  pinMode( in1, INPUT_PULLUP );
  pinMode( in2, INPUT_PULLUP );
  pinMode(LED_BUILTIN, OUTPUT);
  buttonState1 = EEPROM.read(101);
  buttonState2 = EEPROM.read(102);
  digitalWrite(relay1,buttonState1);
  digitalWrite(relay2,buttonState2);
  
  attachInterrupt(digitalPinToInterrupt(in1), button1, RISING);
  attachInterrupt(digitalPinToInterrupt(in2), button2, RISING);
  delay(100);
}