Published November 1, 2016 © GPL3+

Light, Fan, and Dimmer Control with ESP8266 and Cayenne

Repurposing a propriety RF remote control for maximum laziness.

IntermediateShowcase (no instructions)3 hours7,386

Light, Fan, and Dimmer Control with ESP8266 and Cayenne

Things used in this project

Hardware components

Espressif ESP8266 ESP-12E

General Purpose Transistor NPN

Resistor 2.21k ohm

9V to Barrel Jack Connector

3.3v Switching Voltage Regulator

Software apps and online services

myDevices Cayenne

Arduino IDE

Story

About This Project

The previous owner of my house installed remote controlled ceiling lights in all the bedrooms. This was really cool for a couple weeks, but now I’m realizing that it can be really annoying when I misplace the remote. Each room has a separate remote that only works for that room. Extra remotes are both expensive and hard to come by. Making my own rf remote is impractical as they run in the 400mhz range and there is generally very little documentation about the radio codes for this fan model.

To circumvent this, I disassembled one remote and soldered transistors directly to the physical button contacts. An esp8266 is used to control the transistors, allowing me to switch them using the cayenne dashboard or via other wifi connected microcontrollers.

The old remote had functions for fan speed, light on/off and dimmer. The built in buttons and sliders in the cayenne dashboard allow me to use all functionality of the old remote, plus I can set the dimmer level to a specific value right away, rather than having to look at the light while I adjust it.

Furthermore, this all fits inside the old remote housing! I opted to add a barrel connector to the bottom for power, so when “docked” it works as either a physical remote or wifi-connected remote, and when unplugged the physical remote still works due to the internal 9v battery.

What's Connected

5x 2N2222 Transistor 5x 2k ohm resistor ESP8266 microcontroller 3.3v switching regulator Female Barrel connector -> 9v DC wall power 9V alkaline battery

Arduino Sketch

https://github.com/dpeters1/Wifi-Ceiling-Light-Fan-Remote

The arduino sketch is very simple and just deals with the inputs from the cayenne dashboard. For the light on/off and fan control, I am just controlling the HIGH/LOW behaviour of the GPIO pins. The dimmer is a bit more complicated because it is normally adjusted by long-pressing the on/off button on the remote. Cayenne does not have this functionality so instead the arduino has to keep track of the current dimmer level and calculate how long the pin should be pulled HIGH to reach the next desired brightness. As usual with the ESP8266 boards, I am using the OTA method to upload to them as it allows me to modify the code even once it's installed in the remote.

Cayenne Integration

Simple but it works well. Finally a project where I can use the right widget logo!

Photos of the Project

1 / 9

Code

Arduino Sketch

#define CAYENNE_DEBUG         // Uncomment to show debug messages
#define CAYENNE_PRINT Serial  // Comment this out to disable prints and save space
#define roomLight 4
#define fanOff 5
#define fanLow 12
#define fanMed 14
#define fanHigh 13

int lastDimLevel = 0;

#include <CayenneDefines.h>
#include <BlynkSimpleEsp8266.h>
#include <CayenneWiFiClient.h>
#include <CayenneClient.h>
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <ESP8266HTTPUpdateServer.h>

// Cayenne authentication token. This is obtained from the Cayenne Dashboard.
const char* token = "w59t22fwxx";
const char* ssid = "Wu-Tang LAN";
const char* password = "allstream11";
const char* host = "esp8266-webupdate";

ESP8266WebServer httpServer(80);
ESP8266HTTPUpdateServer httpUpdater;

void setup()
{
  Serial.begin(115200);
  Serial.println("Booting Sketch...");
  pinMode(A0, INPUT);
  pinMode(roomLight, OUTPUT);
  pinMode(fanOff, OUTPUT);
  pinMode(fanLow, OUTPUT);
  pinMode(fanMed, OUTPUT);
  pinMode(fanHigh, OUTPUT);

  digitalWrite(roomLight, LOW);
  digitalWrite(fanOff, LOW);
  digitalWrite(fanLow, LOW);
  digitalWrite(fanMed, LOW);
  digitalWrite(fanHigh, LOW);
  
  Cayenne.begin(token, ssid, password);

  MDNS.begin(host);
  httpUpdater.setup(&httpServer);
  httpServer.begin();

  MDNS.addService("http", "tcp", 80);
  Serial.printf("HTTPUpdateServer ready! Open http://%s.local/update in your browser\n", host);
}

void loop()
{
  httpServer.handleClient();
  Cayenne.run();
}

CAYENNE_IN(V0)
{
 push(roomLight); 
}

CAYENNE_IN(V1)
{
  int sliderState = round(getValue.asInt()/1000.0);

  switch(sliderState) {
    case 0:
    {
      push(fanOff);
      break;
    }
    case 1:
    {
      push(fanLow);
      break;
    }
    case 2:
    {
      push(fanMed);
      break;
    }
    case 3:
    {
      push(fanHigh);
      break;
    }
  }
  
}

CAYENNE_IN(V2)
{
  int dimLevel = round(getValue.asInt()/1000.0);
  int dimDelay = dimLevel - lastDimLevel;
  
  if(dimDelay < 0){
    dimDelay = 10 - dimDelay;
  }
  lastDimLevel = dimLevel;

  digitalWrite(roomLight, HIGH);
  delay(1000*0.605*dimDelay);
  digitalWrite(roomLight, LOW);
}

void push(int button){
  digitalWrite(button, HIGH);
  delay(100);
  digitalWrite(button, LOW);
}

Credits

Dominic Peters

2 projects • 2 followers

Light, Fan, and Dimmer Control with ESP8266 and Cayenne

Things used in this project

Hardware components

Software apps and online services

Story

About This Project

What's Connected

Arduino Sketch

Cayenne Integration

Photos of the Project

Schematics

Schematic

Code

Arduino Sketch

Credits

Dominic Peters

Comments

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Light, Fan, and Dimmer Control with ESP8266 and Cayenne

Light, Fan, and Dimmer Control with ESP8266 and Cayenne

Things used in this project

Hardware components

Software apps and online services

Story

About This Project

What's Connected

Arduino Sketch

Cayenne Integration

Photos of the Project

Schematics

Schematic

Code

Arduino Sketch

Credits

Dominic Peters

Comments

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