nodeMCU dimmer/switch/temp.sensor without arduino

@cdj: I think this is a good choice of FET for the application. I see no reason that it should not work. You wrote that the power supply is 6A? For 10 m LED stripes? That sounds too little. How are you driving the FET? 5V or 3.3V GPIO? Can you show us the circuit diagram?

ArneiO wrote: @cdj: I think this is a good choice of FET for the application. I see no reason that it should not work. You wrote that the power supply is 6A? For 10 m LED stripes? That sounds too little. How are you driving the FET? 5V or 3.3V GPIO? Can you show us the circuit diagram?

No, no wait.
This is specs of led strip (FOR 1 STRIP), :
Working input Voltage : 12VDC , 6A
Working power : 72W/5M

I use a 20A power supply for each groups of strip (3 strip for 3.5mt each one)

This is the link for software :
http://iot-playground.com/forum/lua-programming/102-nodemcu-dimmer-switch-temp-sensor-without-arduino
This is code for dimmer, just adapt for two dimmer...

Circuit is very simple, driven direct from esp8266 in nodemcu/lua. GND of supply to mosfet SOURCE, gpio0 to GATE and LED GND to DRAIN.
Same with gpio2

Don't really know why doesn't work with big load

@cdj: That sounds fine, providing the voltage coming from the ESP is high enough. Did you try switching on the FET manually, with a 3.3V signal directly to the gate? It is in general recommended to use a serial resistor to the FET gate to limit inrush current, but I think there is enough output impedence on the ESP for this not to be a problem (in any case, it is not the reason for your problem).
If it works with low load it could sound as if the FET is not properly turned ON. It could be worth while to use a transistor to drive it, switching the 12V to the gate. You would then be sure it is fully ON.

Solved !!! GND of ESP must be in common with SOURCE GND....It works perfectly... but also this node is not very stable.... :

Thanks for helping

Dennis wrote: Hello folks,

in another thread there was the idea to use esp8266 running nodeMCU firmware, to create easyIoT node without arduino, instead directly using the esp8266's GPIO pins to control a LED dimmer, here's link to the other thread: iot-playground.com/forum/suggestion-box/...6-only-needed/unread

User "VasilijHCN" wrote some easyIoT automation program for connecting to a virtual node, to be able to send TCP commands to a nodeMCU with mosFETs attached for LED dimming.

I then further developed this code and extended it to also switch on/off things, so one can use nodeMCU as well for a simple relay node in easyIoT, and published results in said thread - goal was to create one nodeMCU "init.lua" script which can be used as standalone node in easyIoT, for sensor readings and as switch/dimmer, and all without use of arduino, only esp8266 module.

Meanwhile I have done some more development on that code, as well as on the init.lua script running on the esp8266.

- now the switching function uses a separate TCP command, you can send command to nodeMCU in form of "SWITCH1=1" (turns GPIO0 on ) or "SWITCH2=0" (turns off GPIO02) - no pwm duty cycle anymore when switching, gives better relay debounce

- I also added a temperature readout command to the nodeMCU ini.lua, now we can send "GETTEMP" to nodeMCU and get a reply containing temperature as decimal value (atm just a static value is returned; I still need to implement proper sensor readout in init.lua, as soon as I can find a spare Ds18b20 sensor for testing)


So now, we can directly control IO pins of a ESP8266 running nodeMCU (either control with PWM, or just plain digital outputs), and we can read sensor values from it - all from easyIoT.


How does it work?

- load nodeMCU firmware 0.9.4 onto esp8266 module, see this blog post for details on how to do it: blog.quindorian.org/2015/01/esp8266-wifi...mer-part-3-of-x.html

- upload the following "init.lua" script onto your nodeMCU Esp8266 (replace SSID and PASSWORD wifi params with your own):

pwm.setup(3, 1000, 000)
pwm.setup(4, 1000, 000)
pwm.start(3)
pwm.start(4)

LED1_current=000
LED1_target=000
LED2_current=000
LED2_target=000

SWITCH1_state = 0
SWITCH2_state = 0

Fadetime1=1000
Fadetime2=1000

Stepcounter1=0
PosStepcounter1=0
DimTimer1=0

Stepcounter2=0
PosStepcounter2=0
DimTimer2=0

wifi.setmode(wifi.STATION)
wifi.sta.config("MYSSID","MYPASSWORD")



srv=net.createServer(net.TCP) 
srv:listen(43333,function(conn) 
    conn:on("receive",function(conn,payload) 
   
    print("Input: "..payload) 
 
	if string.find(payload,"GETTEMP") then
	 print("Received temperature request")
	 conn:send("25.33")
     

     elseif string.find(payload,"SWITCH1") then
     SWITCH1_state=tonumber(string.sub(payload, 9) )
     print("Received SWITCH1 target Value: "..SWITCH1_state)
     if SWITCH1_state == 1 then
          pwm.setduty(3, 1023)
          LED1_current = 1023
      elseif SWITCH1_state == 0 then
          pwm.setduty(3, 0)
          LED1_current = 0
        end
     

     elseif string.find(payload,"SWITCH2") then
     SWITCH2_state=tonumber(string.sub(payload, 9) )
     print("Received SWITCH2 target Value: "..SWITCH2_state)
     if SWITCH2_state == 1 then
          pwm.setduty(4, 1023)
          LED2_current = 1023
      elseif SWITCH2_state == 0 then
          pwm.setduty(4, 0)
          LED2_current = 0
        end
     
     
     
    elseif string.find(payload,"LED1") then
     LED1_target=tonumber(string.sub(payload, 13) )
     print("Received LED1 Target Value: "..LED1_target)

     Stepcounter1=(LED1_target)-(LED1_current)
     
     if (Stepcounter1) < 0 then
      PosStepcounter1=(Stepcounter1)*-1
      else PosStepcounter1=(Stepcounter1)
     end
     
     if (PosStepcounter1) == 0 then
      PosStepcounter1=(PosStepcounter1)+1
      else PosStepcounter1=(PosStepcounter1)
     end
          
     DimTimer1=(Fadetime1)/(PosStepcounter1)

     if (DimTimer1) == 0 then 
      DimTimer1=(DimTimer1)+1
      else DimTimer1=(DimTimer1)
     end

      print (Fadetime1)
      print (Stepcounter1)
      print (PosStepcounter1)
      print (DimTimer1)
      print (LED1_current)
      print (LED1_target)


    tmr.alarm(0, (DimTimer1), 1, function() 
     if LED1_current < LED1_target then 
      LED1_current = (LED1_current + 1) 
      pwm.setduty(3, LED1_current)
    elseif LED1_current > LED1_target then 
      LED1_current = (LED1_current - 1) 
      pwm.setduty(3, LED1_current)
    elseif LED1_current == LED1_target then tmr.stop(0)
     end end )
    

    elseif string.find(payload,"LED2") then
        print("Received LED2 Target Value")
     LED2_target=tonumber(string.sub(payload, 13) )
     
     Stepcounter2=(LED2_target)-(LED2_current)
     
     if (Stepcounter2) < 0 then
      PosStepcounter2=(Stepcounter2)*-1
      else PosStepcounter2=(Stepcounter2)
     end
     
     if (PosStepcounter2) == 0 then
      PosStepcounter2=(PosStepcounter2)+1
      else PosStepcounter2=(PosStepcounter2)
     end
          
     DimTimer2=(Fadetime2)/(PosStepcounter2)

     if (DimTimer2) == 0 then 
      DimTimer2=(DimTimer2)+1
      else DimTimer2=(DimTimer2)
     end

      print (Fadetime2)
      print (Stepcounter2)
      print (PosStepcounter2)
      print (DimTimer2)
      print (LED2_current)
      print (LED2_target)


    tmr.alarm(1, (DimTimer2), 1, function() 
     if LED2_current < LED2_target then 
      LED2_current = (LED2_current + 1) 
      pwm.setduty(4, LED2_current)
    elseif LED2_current > LED2_target then 
      LED2_current = (LED2_current - 1) 
      pwm.setduty(4, LED2_current)
    elseif LED2_current == LED2_target then tmr.stop(1)
     end end )
    end
    end)
    end)

print ("easyIoT dimmer/switch/temperature sensor for nodeMCU")
print ("Based on QuinLED_ESP8266_V0.4")

after uploading this code as "init.lua", you need to connect module to your wifi, then note its IP address, and restart the module. Both (setting wifi parameters and loading the script onto esp8266) can be done with the following tool: esp8266.ru/esplorer/

- In easyIoT, create virtual node with type "Temperature (AI)" and with parameter "Sensor.Temperature" only (remove all other params).

- create easyIoT automation program "SENSOR" with following crontab settings: "* * * * *" (note spaces between stars)
and with the following code (you need to replace IP address with those of your esp8266 module and replace node ID with that of your virtual sensor, of course):

const String ESP8266_IP_ADDRESS = "192.168.1.50";
const String NODE_ADDRESS = "N5S0";
/*
  This code is running one time when program is enabled
*/
public void Setup()
{
}
/*
  This code is running periodicaly when program is enabled. 
  Cron job detirmine running period.
*/
public void Run()
{
  String response = QueryServer("GETTEMP");
  Console.WriteLine(response);
  ModuleHelper.SetProperty("Virtual", NODE_ADDRESS, "Sensor.Temperature", response.ToString());
  EventHelper.SetEvent("Virtual", NODE_ADDRESS, "Sensor.Temperature");
}
private static string QueryServer(String message)
{
try
	{
		Console.WriteLine("TCP client command: " + message + "\r\n");
		Int32 port = 43333;
		System.Net.Sockets.TcpClient client = new System.Net.Sockets.TcpClient( ESP8266_IP_ADDRESS, port);
		Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);
		System.Net.Sockets.NetworkStream stream = client.GetStream();
		stream.Write(data, 0, data.Length);
		
		data = new Byte[256];
		String responseData = String.Empty;
		Int32 bytes = stream.Read(data, 0, data.Length);
		responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
		// Close everything.
		stream.Close();
		client.Close();
		return responseData;
	}
	catch(Exception e)
	{
		Console.WriteLine(e.StackTrace + "\r\n");
	}
return "0.00";
}

- add another two virtual nodes in easyIoT, one with type "Switch" and one with type "dimmer", and both with Properties "Sensor.DigitalValue" = 0, "Sensor.DimmerLevel" = 0, "Settings.MaxValue" = 100, "Settings.MinValue" = 1 and "Settings.ValueStep" = 1

- add two more automation programs "dimmer1" and "dimmer2" with empty crontab, and containing following code (replace IP with that of esp8266, and replace node IDs with those from the virtual dimmer and switch nodes created above):

// dimmer node N3S0 (red LED)
const String ESP8266_IP_ADDRESS = "192.168.1.50";
const String NODE_ADDRESS = "N3S0";
/*
This code is running one time when program is enabled
*/
public void Setup()
{
	EventHelper.ModuleChangedHandler((o, m, p) =>
	{
		if (m.Domain == "Virtual" && m.Address == NODE_ADDRESS) 
		{
  			Console.WriteLine("\r\n"+ m.Domain +" "+ m.Address +" in program id "+ Program.ProgramId.ToString() +" property "+ p.Property +" value "+ p.Value);
          	Console.WriteLine("Program was triggered by change of "+ p.Property +" for node id "+ m.Address);
          	switch (p.Property)
            {
              case "Sensor.DimmerLevel":
              	int myVal;
  	          	myVal = ConvertRange(0, 100, 0, 1023, Convert.ToInt32(p.Value));
				Console.WriteLine("Mapped "+ p.Property  +" value of "+ p.Value +" to pwm value "+ myVal);
				sendCommand(myVal.ToString());
              	break;
              case "Sensor.DigitalValue":
              	Console.WriteLine("triggering \"Sensor.DimmerLevel\" event...\r\n");
              	sendToServer("SWITCH1="+p.Value);
              	ModuleHelper.SetProperty(m.Domain, m.Address, "Sensor.DimmerLevel", (Convert.ToInt32(p.Value)*100).ToString());
            	EventHelper.SetEvent(m.Domain, m.Address, "Sensor.DimmerLevel");
              	break;
              default:
              	break;
            } //end switch
        }//end if
	return true;
	});//end EventHelper
}

/*
This code is running periodicaly when program is enabled.
Cron job detirmine running period.
*/
public void Run()
{}

private void sendCommand(string value)
{
	sendToServer("LED1_target="+value); // LED1 - here we set channel
}

private void sendToServer(String message)
{
	try
	{
		Console.WriteLine("TCP client command:" + message + "\r\n");
		Int32 port = 43333;
		System.Net.Sockets.TcpClient client = new System.Net.Sockets.TcpClient( ESP8266_IP_ADDRESS, port);
		Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);
		System.Net.Sockets.NetworkStream stream = client.GetStream();
		stream.Write(data, 0, data.Length);
		// Close everything.
		stream.Close();
		client.Close();
	}
	catch(Exception e)
	{
		Console.WriteLine(e.StackTrace + "\r\n");
	}
}

private static int ConvertRange(
    int originalStart, int originalEnd, // original range
    int newStart, int newEnd, // desired range
    int value) // value to convert
{
    double scale = (double)(newEnd - newStart) / (originalEnd - originalStart);
    return (int)(newStart + ((value - originalStart) * scale));
}

- add all virtual nodes (dimmer, sensor, switch) to module group of choice, and enjoy

I will periodically update here important code changes/enhancements.


EDIT - updated sources are available on github now:
github.com/DennisSc/easyIoT-nodeMCU


have fun,

regards

Thanks a lot man, everything its ok but i have only one question. How can i use and control separately both GPIO0 and GPIO2 of the Esp8266 1?