ESP8266 Controlled Door Operator

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Door operator swing door.jpg

At our office building, there is a Dorma Automatic Swing Door Operator which is normally engaged by a push button next to the door frame and also wirelessly from the hall way end of the door.

Pressing and waiting for the door to open is unbearable, therefore I made the decision to add a third option to the mix; operating it wirelessly from my mobile phone using the web browser.

Digital switch

The way the existing wired and wireless buttons are wired on the automatic door operator is fairly simple, just ground and a control signal which is pulled high (24V). Pull this control line low and the door will engage and begin to swing open.

Adding a third option is just a matter of adding a transistor between the control signal and ground; and having a controller toggle the transistor when needed.


Door operator schematic.png

The system is based on a 3.3V regulator (although I used my own ESP8266 breakout board which has a 3.3V regulator, connected to a 5V regulator capable of handling 24V in), the main ESP8266-ESP01 board and a pair of PNP and NPN transistors.


For this to be a one day build, I had to take some shortcuts to save time. The build is fully functional, but it might not look visually pleasing.

Everything was wrapped and isolated before being installed.

Door operator build1.jpg Door operator build2.jpg


The code is based on Lua for the NodeMCU firmware. Programmed using LuaLoader via a 3.3V FTDI USB adapter.

This code is based on a simple web server and modified to wait 500ms before releasing the pull-low toggleT.

led1 = 3
led2 = 4
gpio.mode(led1, gpio.OUTPUT)
gpio.write(led1, gpio.LOW);
gpio.mode(led2, gpio.OUTPUT)
gpio.write(led2, gpio.LOW);
    conn:on("receive", function(client,request)
        local buf = "";
        local _, _, method, path, vars = string.find(request, "([A-Z]+) (.+)?(.+) HTTP");
        if(method == nil)then
            _, _, method, path = string.find(request, "([A-Z]+) (.+) HTTP");
        local _GET = {}
        if (vars ~= nil)then
            for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
                _GET[k] = v
        buf = buf.."HTTP/1.1 200 OK\nCache-Control: no-cache, no-store, must-revalidate\nPragma: no-cache\nExpires: 

        buf = buf.."<html><head><title>ESP8266 Srv</title></head><body><h1>ESP8266 Web Server</h1>";
        buf = buf.."<p>GPIO0 <a href=\"?pin=ON1\"><button>ON</button></a> <a 

        buf = buf.."<p>GPIO2 <a href=\"?pin=ON2\"><button>ON</button></a> <a 

        buf = buf.."</body></html>";
        local _on,_off = "",""
        if( == "ON1")then
          gpio.write(led1, gpio.HIGH);
          gpio.write(led1, gpio.LOW);
          elseif( == "OFF1")then
              gpio.write(led1, gpio.LOW);
              elseif( == "ON2")then
        	  gpio.write(led2, gpio.HIGH);
		  gpio.write(led2, gpio.LOW);
                  elseif( == "OFF2")then
                      gpio.write(led2, gpio.LOW);


The installation process is as simple as it get. Just figure out how the existing buttons are wired and find a power&gnd lane to power everything. Luckly, the wireless module for the door was also powered by 24V so all three necessary pins were next to each other.

For easy removal later on, I did not screw the wires into the terminal block but just stuck them into the right terminal pin.

Door operator installed.jpg Door operator installed2.jpg

There was lots of room in the back of the unit to mount everything. This is the area where the cables from the buttons and sensors came in, so just a little re-jiggling was needed.


This shows the screen of an iPhone connected to the webserver. Opening the door is as easy as just toggling the button. By making a shortcut on the home-screen directly to the toggling URL makes it even easier to engage.

Door operator iphone webbrowser.png

FHEM automation setup

To make this setup of any practical use, it would be great to integrate the new web capability of the door controller with other sensors and handlers. FHEM is a open "home automation suite" and is very flexible in what you can do with it. By specifying when a sensor triggers, it can spit out a request to the door controller webserver and open the door, e.g. when your main office door opens (sensed by a magnetic sensor), also open the next door down the hall. Or when you click the "OPEN" link in the web interface, open the door.

Door operator fhem automation.png

Edit fhem.cfg and put these lines into the file:

define dooroperator dummy
attr dooroperator devStateIcon open:signal_Fenster_Offen.on
attr dooroperator setList open
attr dooroperator webCmd open
define dooroperatorNtfy notify dooroperator {GetFileFromURL "http://192.168.xx.xx/?pin=ON1"}
define dooroperatorContact notify EnO_contact_01825A29:open set dooroperator open
define dooroperatorSwitch notify EnO_switch_00294BF1:A0 set dooroperator open

The last two lines are use to link the magnetic reed switch on the door and the manual self-powered button switch to the door operator action.

You can also call the action directly via http://192.168.xx.xx:8085/fhem?cmd=set%20dooroperator%20open