Universal Remote Using ESP8266(Wifi Controlled)

About: Nothing just a tech enthusiast and by degree an Electrical Engineer

This project is to replace the conventional remote control for all the home appliances like AC, TV, DVD players, music system, SMART appliances !!! Making a whole junk of remote littering around, making us puzzle!!!

This project will save us from the junk to remotes by replacing all by ONE REMOTE!

2 part of this project:

  • DECODING ANY REMOTE
  • ENCODING ESP8266 NODEMCU 1.0(ESP-12E module) or any esp8266 version with a ttl connection

IMPORTANT : PLEASE READ THE WHOLE PROJECT THOROUGHLY IT WILL TAKE 3MINS BUT DON'T HALF-READ AND DAMAGE YOUR PARTS.... I WILL NOT BE RESPONSIBLE!!

Step 1: Configuring Nodemcu With Arduino IDE

  • First of all connect the Nodemcu (my one is lolin v3, amica and other clones will work too) with computer or laptop.
  • Now install the driver of nodemcu(google search will help).
  • After this open the Arduino IDE (Ofcourse you need to download it and install it)
  • Click on "Tools" on Arduino toolbar
  • Click on "Board"
  • Select "Board Manager" and search for esp8266 install it (will take some time to finish)
  • Now, select "Sketch" from arduino toolbar
  • Select "Include Library" from there select "Manage libraries"
  • Search for "IRremoteESP8266" and install it

Now the configuration is done only from "Tools" we need to go to "Boards" Select "NodeMcu 1.0(ESP 12-E)" or something else version of ESP8266.

Step 2: DECODING a Remote |CIRCUIT | Code

So, to make a universal remote we need to decode the other remotes i.e. to get IR hexadecimal codes emitted by each button of remotes. Just like to speak universally we need to know every language!!! OR learn English! Though I love my mother tongue Bengali the sweetest language!! REALLY it is, search it...

So components needed to decode a remote:

  • Nodemcu board
  • TSOP1738 IR reciever or some other IR recievers
  • jumpers

Now, follow the above circuit but after uploading the sketch to the nodemcu through Arduino.

  • Open Arduino and connect the nodemcu to laptop or computer
  • From "Files" select example go down and from IRremoteESP8266 select the IRrecvDump
  • Upload to nodemcu

Connect the TSOP1738 to Nodemcu as the circuit and open the "serial monitor" from Arduino to see the decoded hex-code of any remote as pictures given above. Still uploading the code

Step 3: Encoding Nodemcu | CIRCUIT

After decoding the remotes now it's turn to upload the hex-codes to Nodemcu so that it can give IR led commands to emit those hex-code signals.

  • NOTE: can't connect IR led directly to Nodemcu cause it can't deliver enough current.
  • So need transistor moderated IR LED i.e. signal from Nodemcu goes to transistor then IR LED.
  • Transistor like 2N222, 2N3904,BC547 works but

Transistor 2N222,2N3904 collector current : 600mA

Transistor BC547 collector current : 100mA

both works...

CAUTION SEE THE COLLECTOR, EMITTER, BASE TERMINALS as BC547 and 2N222 have different convention. I have used BC547 as it is easily available and works fine.

Code is taken from "IRremoteESP8266" examples "IRserver" modified accordingly as shown in picture.

circuit as shown. Please NOTE I have used BC547 transistor and NO resistance between base and D2 pin.

THE COLLECTOR, EMITTER, BASE ARE INDICATED IN PICTURE. DON'T DO THE SAME FOR OTHER TRANSISTORS.

EDITS: Credits "3615JMD"

IMPROVENTS:

May I suggest 2 improvements:
1) if one replaces : uint32_t code = strtoul(server.arg(i).c_str(), NULL, 10); by this uint32_t code = strtoul(server.arg(i).c_str(), NULL, 16); The web page accepts HEX codes directly. No need to convert manually to decimal !

2) I have improved the handler to be able to work with multiple IR formats. Nice when we want to control several devices from different brands: (more formats can be added with a switch/case)

void handleIr()

{ for (uint8_t i = 0; i < server.args(); i++) { if (server.argName(i) == "rcmm") { // format pour la freebox uint32_t code = strtoul(server.arg(i).c_str(), NULL, 16); irsend.sendRCMM(code, 32); Serial.println(code); } else if (server.argName(i) == "rc6") { // format pour la TV phillips uint32_t code = strtoul(server.arg(i).c_str(), NULL, 16); irsend.sendRC6(code, 20); Serial.println(code); } } handleRoot(); } The HTTP links must be modified accordingly of course : .... href=\"ir?rcmm=2400260C....... .... href=\"ir?rc6=0000C ....

Step 4: Encoding Code

I have taken the code from examples of "IRremoteESP8266", "IRserver".

But there are some changes to be done your wifi credentials - Wifi ssid, Wifi password

The Web server based codes(yellow highlighted) - This codes are the decimal form of the hexadecimal IR codes. This decimal values are passed to ESP8266 as arguments converted to hex-code and transmitted to IR LED.

IMPORTANT : AFTER DECODING A REMOTE BUTTON CONVERT THE HEXADECIMAL CODE TO DECIMAL AND REPLACE IT IN THE Arduino program. Its not very hard to convert hex to decimal, search google for online hexadecimal to decimal converter.

images are self-explanatory!!!

Step 5: CONTROLLING

We can control it through the web server links... the IP of ESP8266 module on our router can be known by opening the serial monitor just after uploading the code. As in picture mine is 192.168.0.1

On opening this IP in any browser of mobile or laptop we can see the page as shown in picture.

OR ELSE FOR CONVENIENCE and simplicity we can use a android app...

"HTTP REQUEST SHORTCUT" app and do write the address to easily execute the code. As in picture, we can add widget on home screen to easily access the virtual buttons and get the necessary remote buttons.

Pictures are self explanatory.

SO WITHOUT WRITING IN THE PROGRAM WE CAN PASS THE ARGUMENT "CODE" WITH DECIMAL OF THE HEXADECIMAL CODE EXTRACTED FROM DECODING REMOTES DIRECTLY IN THE WIDGET.

IMPORTANT : PLEASE READ THE WHOLE PROJECT THOROUGHLY IT WILL TAKE 3MINS BUT DON'T HALF-READ AND DAMAGE YOUR PARTS.... I WILL NOT BE RESPONSIBLE!!

Step 6: Project Packed GIF!!!

If you like this make this project your favorite and encourage to do next project like internet controlled home automation... or something better!!!

Thanks a lot enjoy a remote-free life!!!

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    28 Discussions

    0
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    ROUGEXIII

    7 weeks ago

    Hi,
    Can you explain why you don't need resistor for your emitter led?
    How do you set the current limit to not damage the led?

    3 replies
    0
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    Abhrodeep ChandaROUGEXIII

    Reply 7 weeks ago

    I have used a transistor i.e. BC547 that has a collector current of 100mA for which ai don't need a ressistor to limit the current. If I would have used 2N222 transistor definitely there will be a resistor to limit the collector current of 600mA. Thanks for asking but I mentioned it in the article about the collector current of the different transistor. For BC547 the range also gets short as the led is not emitting at its peak.

    0
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    ROUGEXIIIAbhrodeep Chanda

    Reply 6 weeks ago

    Hi,
    Thanks for your answer, sorry I didn't understood the transistor was the current limiter. I never see a such usage, very interesting. Isn't there any risk for the transistor? I thought the data-sheet current was a limit rather than a characteristic.

    0
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    Abhrodeep ChandaROUGEXIII

    Reply 6 weeks ago

    Did I say the transistor is acting as current limiter? If I did I'm totally wrong. current limit for transistor is 100mA. The circuit is running on 3V, the normal resistance of the IR led is 22-25ohm and transistors are made of semi-conducting materials as well as depletion zone also provides a bit resistance even if forward biased. So in my circuit when I used resistance of 33ohm the IR led's intensity was so less I literally had to take it to the TV and make it cuddle with it. So mathematically 3V/32ohm (around) in my case 93mA that is not at all above the limit. But when I measured in the circuit it was 80mA or less. So I concluded that having a current limiter resistance theoretically is good but in practical nothing is perfect so need to innovate and make it like "what you need". This is an 1year old project but my IR Led and transistor both are working fine. Thanks for pointing me though.

    0
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    AtuxA

    Question 7 weeks ago

    i cannot find anywhere in the market the sending IR LED device you are using. which one is it?

    5 more answers
    0
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    Abhrodeep ChandaAtuxA

    Answer 7 weeks ago

    You can easily get it on amazon/ebay online. I actually purchased it from a shop offline as they keep all types of electronic components.

    0
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    AtuxAAbhrodeep Chanda

    Reply 7 weeks ago

    could you send me a link of the IR led in amazon or ebay, so i would know that i have the same type/model, please?

    0
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    Abhrodeep ChandaAtuxA

    Reply 7 weeks ago

    can you specifically say which one do you need the IR receiver or IR led

    0
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    AtuxA

    Question 7 weeks ago on Step 6

    Dear Sir, i came across your project and it exactly what i was looking for. I am trying to collect the components and i have issue with TSOP1738. I would like to ask if i could connect a different one (Infrared IR Receiver Sensor Module KY-022). Unless you have to propose something else. Since i do not have experience with electronics, it has to be as identical to current and all the components needed for this job.

    1 more answer
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    Abhrodeep ChandaAtuxA

    Answer 7 weeks ago

    Both are just identical as both operate in 38KHz, just check pinout for signal, 5V and GND pins. Difference between this two are - Angle of reception (TSOP1738-90degree , KY-022 - 45degrees) , Operating current range (0.4mA to 1.5mA - ky-022, 0.4mA to 1mA - TSOP1738). No other major differences.

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    PatM149

    Question 4 months ago

    Will this work with non NEC decoded remotes? Is it possible to use the captured rawData for this project? Thanks!

    ssss.PNG
    3 more answers
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    Abhrodeep ChandaPatM149

    Answer 4 months ago

    There is a 175bits Hexcode you can use it, it will work. AC is having some problem but it should work fine to my knowledge as I tried afterwards. just need to be correct with code and number.

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    PatM149Abhrodeep Chanda

    Reply 3 months ago

    Thank you for your reply! I changed this line of code :

    uint32_t code = strtoul(server.arg(i).c_str(), NULL, 10);

    irsend.sendNEC(code, 32);

    to :

    uint16_t code = strtoul(server.arg(i).c_str(), NULL, 10);

    irsend.sendNEC(code, 175);

    and I converted C71AE5F4 to hex but still it doesn't work. Please help me thank you!!

    0
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    Abhrodeep ChandaPatM149

    Reply 3 months ago

    " I converted C71AE5F4 to hex"? but this is itself a hex code. I dont understand. unit32_code was alright. we cant put irsend. sendNEC(code, 175) to represent 175bit sending signal just put that hexcode you got in the picture 34B8AC66

    0
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    CristiI5

    3 months ago

    Hi, I'm using HX1838 ( https://www.optimusdigital.ro/ro/componente-electr... )

    receiver and I got a lot of "ghost readings", so if I'm not seding signals from remote in the serial console I get random readings (3, 8 10 bits). And when I press the remote button, I got "UNKNOWN" status almost time. From 20-30 readings of same button, just once is detected correctly. I tried to hide the sensor, I tough reads something from the computer screen or from light bulbs, but not.

    Do you have any idea why this happens or how can I solve it?

    Thank you.

    3 replies
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    Abhrodeep ChandaCristiI5

    Reply 3 months ago

    I dont have any idea about HX1838 but please check the circuit. If you are using BC547 then change it to 2N222 and use a pull up resistance. And read the circuit portion carefully. loose connection can be the luckiest solution though.

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    CristiI5Abhrodeep Chanda

    Reply 3 months ago

    It is about the receiver. As I understand the transistor is needed for the sending led. I put same receiver on a arduino nano and that reads correctly. On nodemcu v3 only errorer readings and fake teadings.

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    Abhrodeep ChandaCristiI5

    Reply 3 months ago

    Sorry but your perception about transistor is wrong as it here acts as a current amplifier and boosts the signal received from the IR led. So if the current is not up to the mark the signal will give errorneous results. And arduino is of 5V logic but nodemcu is of 3.3V logic so transistor matters for nodemcu