ESP8266 Controlled Door Operator
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 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.
Schematic
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.
Code
The code is based on Lua for NodeMCU. This code is just a sample web server code modified to wait 500ms before releasing the pull-low event.
wifi.setmode(wifi.STATION)
wifi.sta.config("WIFISSID","WIFIPASSWD")
print(wifi.sta.getip())
led1 = 3
led2 = 4
gpio.mode(led1, gpio.OUTPUT)
gpio.write(led1, gpio.LOW);
gpio.mode(led2, gpio.OUTPUT)
gpio.write(led2, gpio.LOW);
srv=net.createServer(net.TCP)
srv:listen(80,function(conn)
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");
end
local _GET = {}
if (vars ~= nil)then
for k, v in string.gmatch(vars, "(%w+)=(%w+)&*") do
_GET[k] = v
end
end
buf = buf.."HTTP/1.1 200 OK\nCache-Control: no-cache, no-store, must-revalidate\nPragma: no-cache\nExpires:
0\n\n";
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
href=\"?pin=OFF1\"><button>OFF</button></a></p>";
buf = buf.."<p>GPIO2 <a href=\"?pin=ON2\"><button>ON</button></a> <a
href=\"?pin=OFF2\"><button>OFF</button></a></p>";
buf = buf.."</body></html>";
local _on,_off = "",""
if(_GET.pin == "ON1")then
gpio.write(led1, gpio.HIGH);
tmr.delay(500000);
gpio.write(led1, gpio.LOW);
elseif(_GET.pin == "OFF1")then
gpio.write(led1, gpio.LOW);
elseif(_GET.pin == "ON2")then
gpio.write(led2, gpio.HIGH);
tmr.delay(500000);
gpio.write(led2, gpio.LOW);
elseif(_GET.pin == "OFF2")then
gpio.write(led2, gpio.LOW);
end
client:send(buf);
client:close();
collectgarbage();
end)
end)
Installed
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. To easy removal, I did not screw the wires into the block but just stuck them into the right terminal.
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.
Working
This shows the screen of an iPhone operating 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.
