ESP8266 RGB Color Picker




ESP8266 RGB Color Picker

In this project, you’re going to build a web server with an ESP8266 to remotely control an RGB LED. This project is called ESP8266 RGB Color Picker.

First, watch the video demonstration

 

To learn more about the ESP8266 and RGB LEDs use the following tutorials as a reference:

If you like the ESP and you want to do more projects you can download my eBook Home Automation using ESP8266 here.

Let’s get started!

Parts List

Here’s the hardware that you need to complete this project:

Flashing Your ESP with NodeMCU

In this tutorial we are going to use the NodeMCU firmware. You have to flash your ESP with NodeMCU firmare.

Downloading ESPlorer IDE

I recommend using the ESPlorer IDE which is a program created by 4refr0nt to send commands to your ESP8266.

Follow these instructions to download and install ESPlorer IDE:

  1. Click here to download ESPlorer
  2. Unzip that folder
  3. Go to the main folder
  4. Run “ESPlorer.jar” file
  5. Open the ESPlorer IDE

 

Uploading Code

You should see a window similar to the preceding Figure, follow these instructions to upload a Lua file:

  1. Connect your ESP8266-12E that has built-in programmer to your computer
  2. Select your ESP8266-12E port
  3. Press Open/Close
  4. Select NodeMCU+MicroPtyhon tab
  5. Create a new file called init.lua
  6. Press Save to ESP

Everything that you need to worry about or change is highlighted in red box.

 

Code

Upload the following code into your ESP8266 using the preceding software. Your file should be named “init.lua“.

Don’t forget to add your network name (SSID) and password to the script below.

-- Rui Santos
-- Complete project details at http://randomnerdtutorials.com

wifi.setmode(wifi.STATION)
wifi.sta.config("YOUR_NETWORK_NAME","YOUR_NETWORK_PASSWORD")

tmr.delay(5000)
print(wifi.sta.getip())

function led(r, g, b)
    pwm.setduty(1, r)
    pwm.setduty(2)
    pwm.setduty(3, b)
end
pwm.setup(1, 1000, 1023)
pwm.setup(2, 1000, 1023)
pwm.setup(3, 1000, 1023)
pwm.start(1)
pwm.start(2)
pwm.start(3)

srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
    conn:on("receive", function(client,request)
        local buf = "";
        buf = buf.."HTTP/1.1 200 OK\n\n"
        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP");
        if(method == nil)then
            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP");
        end
        local _GET = {}
        if (vars ~= nil)then
            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
                _GET[k] = v
            end
        end
        buf = buf.."<!DOCTYPE html><html><head>";
        buf = buf.."<meta charset=\"utf-8\">";
        buf = buf.."<meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\">";
        buf = buf.."<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">";
        buf = buf.."<link rel=\"stylesheet\" href=\"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css\">";
        buf = buf.."<script src=\"https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js\"></script>";
        buf = buf.."<script src=\"https://cdnjs.cloudflare.com/ajax/libs/jscolor/2.0.4/jscolor.min.js\"></script>";
        buf = buf.."</head><body><div class=\"container\"><div class=\"row\"><h1>ESP Color Picker</h1>";       
        buf = buf.."<a type=\"submit\" id=\"change_color\" type=\"button\" class=\"btn btn-primary\">Change Color</a> ";
        buf = buf.."<input class=\"jscolor {onFineChange:'update(this)'}\" id=\"rgb\"></div></div>";
        buf = buf.."<script>function update(picker) {document.getElementById('rgb').innerHTML = Math.round(picker.rgb[0]) + ', ' +  Math.round(picker.rgb[1]) + ', ' + Math.round(picker.rgb[2]);";      
        buf = buf.."document.getElementById(\"change_color\").href=\"?r=\" + Math.round(picker.rgb[0]*4.0117) + \"&g=\" +  Math.round(picker.rgb[1]*4.0117) + \"&b=\" + Math.round(picker.rgb[2]*4.0117);}</script></body></html>";
        
        if(_GET.r or _GET.g or _GET.b) then
            -- This is for RGB Common Cathode
            -- led(_GET.r, _GET.g,_GET.b)
            
            -- This is for RGB Common Anode
            led(1023-_GET.r, 1023-_GET.g,1023-_GET.b)   
        end
        client:send(buf);
        client:close();
        collectgarbage();
    end)
end)

Important: If you’re using an RGB LED common cathode, you need to comment and uncomment some code in the if(_GET.r or _GET.g or _GET.b) statement as described in the script comments.

For More Details: ESP8266 RGB Color Picker




© 2015 Powered By Engineering Projects Team, Raspberry Pi Projects

Scroll to top