How do I receive data from a remote control on a Wemos D1 Mini with a 433MHz RF module?

Question

Hello I have made the board and have everything after connected. First comes the 4 channel 433MHz radio module and then the wemos d1 mini. The libraries are installed and everything is working because I am able to connect to the wifi or light up the LED. However, I don't know how and I've been...

Anonymous · Answer

. . Do you want to transmit or receive codes from the remote control? The example for receiving from the rc-switch library is a little different: Code: C / C++Log in, to see the code .

kaimaz · Answer

@khoam want to receive with remote transmit in receiver connected to wemos I am receiving

Anonymous · Answer

. Does the example I gave in my previous post work for you?

kaimaz · Answer

Unfortunately not admittedly there you have ``mySwitch.enableReceive(0)`` and I have it connected to D2 which as you can see from the diagram is pin 4. .

Anonymous · Answer

Actually for the ESP8266 this code should look slightly different (different pin number): Code: C / C++Log in, to see the code .

kaimaz · Answer

Unfortunately I've tried before and both don't work, in the serial monitor I have the question mark reversed. Added after 4 [minutes]: . Code: text Expand Select all Copy to clipboard/*   Simple example for receiving       */ #include  RCSwitch mySwitch = RCSwitch(); void setup() {   Serial.begin(9600);   mySwitch.enableReceive(4);  // Receiver on interrupt 0 => that is pin #2 } void loop() {   if (mySwitch.available()) {          int value = mySwitch.getReceivedValue();          if (value == 0) {       Serial.print(Unknown encoding);     } else {       Serial.print(Received );       Serial.print( mySwitch.getReceivedValue() );       Serial.print( / );       Serial.print( mySwitch.getReceivedBitlength() );       Serial.print(bit );       Serial.print(Protocol: );       Serial.println( mySwitch.getReceivedProtocol() );     }     mySwitch.resetAvailable();   } } . This is another example I found from this library but in general most of these queries return some weird bushes in the serial monitor and so I have Serial.begin the same as baud in the serial monitor .

Anonymous · Answer

Do you have the speed set correctly in Serial Monitor i.e. according to Serial.begin()? In the code from post #6 it is 115,200.

kaimaz · Answer

@khoam as you can see from the printscreen when I have 9600 set it here and here and when 115200 set it here and here .

Anonymous · Answer

If you are supplying the RF receiver module with 5V, you should use a 5V/3V3 level converter when connecting to pin D2 on the wemos.

kaimaz · Answer

In general, on my board the current goes through the RF module at 5V, and then it goes to the Wemos at 5V. And when I want to connect to the wifi it works, and the test flashing light too. Unfortunately I can't receive data. My RF receiver has two data and I connected one to D2 and the other to D3.

Anonymous · Answer

. This has nothing to do with it - if you are sending data to a pin in Wemos, it must be in 3V3 logic, not 5V. Otherwise you could damage that pin. For this case you can use the simplest solution: .

kaimaz · Answer

but generally when I put the meter to the data pins on the transmitter there is no voltage at all when I press the button on the remote control, so I thought there was no current there? Added after 13 [minutes]: . I have this one and now there is 5V going to VCC at my place. GND goes to GND DATA 2 goes to D2 and DATA 3 goes to D3 Then from VCC goes from Wemos d1 mini 5v and GND to GND Do you think to unsolder and give a resistor between DATA 2 and D2? And interesting that when I check the voltage on DATA2 and GND with a meter it doesn't show anything when I press the button on the remote, is this normal?

Anonymous · Answer

. The DATA2 and DATA3 pins are in this receiver module connected to each other , so there is no point in connecting both of these pins to Wemos. You use D2 from the Wemos and connect it to DATA2 or DATA3 in the RF receiver module through the level converter whose schematic I have already given. . Such measurements are made with an oscilloscope. Edit: As you have connected DATA2 and DATA3 from the receiver module to different pins on the Wemos, you have shorted these pins together quite effectively....

kaimaz · Answer

I don't exactly have such a resistor. I have 1k, 4.7k and smaller Because this diagram I don't know how to apply to me. I have unsoldered DATA2 and DATA3 and 5V goes to VCC and to 5V in d1 mini and GDN goes to GDN and then to GDN in d1 mini. If I put a resistor there for example from DATA2 to D2 on the d1 mini is that enough? and which one to use? Are there any small oscillators? because I found on allegro only big ones Added after 3 [hours] 11 [minutes]: @khoam generally I gave 1k and 4k7 to the gdn. and used this code Code: text Expand Select all Copy to clipboard #include  RCSwitch mySwitch = RCSwitch(); void setup() {   Serial.begin(115200);   mySwitch.enableReceive(4); // albo mySwitch.enableReceive(4) } void loop() {   if (mySwitch.available()) {          Serial.print(Received );     Serial.print( mySwitch.getReceivedValue() );     Serial.print( / );     Serial.print( mySwitch.getReceivedBitlength() );     Serial.print(bit );     Serial.print(Protocol: );     Serial.println( mySwitch.getReceivedProtocol() );     mySwitch.resetAvailable();   } } . in the serial monitor it appeared: Code: text Expand Select all Copy to clipboard⸮⸮  ⸮load 0x4010f000, len0x2d csum 0x2d v6000001c ~ld Exception (29): epc1=0x4000e1b2 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000000 depc=0x00000000 ctx: sys  sp: 3ffff920 end: 3fffffb0 offset: 01a0 >>>stack>>> 3ffffac0:  3ffe8de2 000002f4 60000e00 401004f4   3ffffad0:  3fffff10 000000a2 60000e00 401071ac   3ffffae0:  40206cd0 40101890 00000000 40206d0c   3ffffaf0:  40101b70 000003fd 000000a2 60000200   3ffffb00:  3fffff10 00000000 00000000 00000000   3ffffb10:  ffffe6fc ffffffff ffff0003 0000000f   3ffffb20:  4b414241 554e5f53 4741505f 00494441   3ffffb30:  feefeffe feefeffe feefeffe feefeffe   3ffffb40:  00030503 73000001 6b656e79 696d616d   3ffffb50:  316b656e 9240003f 39401048 00000035   3ffffb60:  30000001 d03ffee3 013fffda c8000000   3ffffb70:  b03ffee2 d0402015 0a3fffda 14000000   3ffffb80:  393ffef5 00402018 50afc2b2 8264d7ee   3ffffb90:  856680df 8d642dbb a1c91200 e1b89120   3ffffba0:  e275bf85 ce70548b ffffffff ffffffff   3ffffbb0:  ffffffff ffffffff 0dd800ff 2221a417   3ffffbc0:  0000000f 79726146 6b6e694c 3743345f   3ffffbd0:  00393644 00000000 00000000 00000000   3ffffbe0:  00000000 00000000 00000000 00000000   3ffffbf0:  00000000 00000000 00000000 00000000   3ffffc00:  00000000 00000000 00000000 00000000   3ffffc10:  00000000 00000000 00000000 00000000   3ffffc20:  00000000 ffffff00 ffffffff ffffffff   3ffffc30:  ffffffff ffffffff ffffffff ffffffff   3ffffc40:  ffffffff 000001ff ffffff04 ffff0001   3ffffc50:  0000000f 4b414241 554e5f53 4741505f   3ffffc60:  00494441 feefeffe feefeffe feefeffe   3ffffc70:  feefeffe 656e7973 6d616d6b 6b656e69   3ffffc80:  40003f31 40104892 00003539 00000100   3ffffc90:  3ffee330 3fffdad0 00000001 3ffee2c8   3ffffca0:  402015b0 3fffdad0 0000000a 3ffef514   3ffffcb0:  40201839 ffffffff ffffffff ffffffff   3ffffcc0:  ffffffff ffffffff ffffffff ffffffff   3ffffcd0:  ffffffff ffffffff ffffffff ffffffff   3ffffce0:  ffffffff ffffffff ffffffff ffffffff   3ffffcf0:  ffffffff ffffffff ffffffff ffffffff   3ffffd00:  ffffffff ffffffff ffffffff ffffffff   3ffffd10:  ffffffff ffffffff ffffffff ffffffff   3ffffd20:  ffffffff ffffffff ffffffff ffffffff   3ffffd30:  ffffffff ffffffff ffffffff ffffffff   3ffffd40:  ffffffff ffffffff ffffffff ffffffff   3ffffd50:  ffffffff ffffffff ffffffff ffffffff   3ffffd60:  ffffffff ffffffff ffffffff ffffffff   3ffffd70:  ffffffff ffffffff ffffffff ffffffff   3ffffd80:  ffffffff ffffffff ffffffff ffffffff   3ffffd90:  ffffffff ffffffff ffffffff ffffffff   3ffffda0:  ffffffff ffffffff ffffffff ffffffff   3ffffdb0:  ffffffff ffffffff ffffffff ffffffff   3ffffdc0:  ffffffff ffffffff ffffffff ffffffff   3ffffdd0:  ffffffff ffffffff ffffffff ffffffff   3ffffde0:  ffffffff ffffffff ffffffff ffffffff   3ffffdf0:  ffffffff ffffffff ffffffff ffffffff   3ffffe00:  ffffffff ffffffff ffffffff ffffffff   3ffffe10:  ffffffff ffffffff ffffffff ffffffff   3ffffe20:  ffffffff ffffffff ffffffff ffffffff   3ffffe30:  ffffffff ffffffff ffffffff ffffffff   3ffffe40:  ffffffff ffffffff ffffffff ffffffff   3ffffe50:  ffffffff 00000003 ffffff00 ffffffff   3ffffe60:  ffffffff ffffffff ffffffff ffffffff   3ffffe70:  ffffffff ffffffff ffffffff ffff0064   3ffffe80:  00000000 00000000 ffffffff ffffffff   3ffffe90:  ffffffff ffffffff ffffffff ffffffff   3ffffea0:  ffffffff ffffffff ffffffff ffffffff   3ffffeb0:  ffffffff ffffffff ffffffff ffffffff   3ffffec0:  ffffffff ffffffff ffffffff ffffffff   3ffffed0:  ffffffff ffffffff ffffffff ffffffff   3ffffee0:  ffffffff ffffffff ffffffff ffffffff   3ffffef0:  ffffffff 50afc2b2 8264d7ee 856680df   3fffff00:  8d642dbb a1c91200 e1b89120 e275bf85   3fffff10:  ce70548b ffffffff ffffffff ffffffff   3fffff20:  ffffffff ffffffff ffffffff ffffffff   3fffff30:  ffffffff ffffffff ffffffff ffffffff   3fffff40:  ffffffff ffffffff ffffffff ffffffff   3fffff50:  ffffffff ffffffff ffffffff ffffffff   3fffff60:  ffffffff ffffffff ffffffff ffffffff   3fffff70:  ffffffff ffffffff ffffffff ffffffff   3fffff80:  ffffffff ffffffff ffffffff ffffffff   3fffff90:  ffffffff 2575aa0e a6c3b7eb 950406cd   3fffffa0:  400201e9 b0e746c5 ffffff01 55aa55aa

Anonymous · Answer

. No code loading into Wemos - process stops with an error while loading. A completely different class of problem. . Remove the Wemos module from the chip and then try to program it.

kaimaz · Answer

I have now successfully uploaded it but it still shows nothing new in the serial monitor but Code: text Expand Select all Copy to clipboard 1384, room 16  tail 8 chksum 0x2d csum 0x2d v6000001c ~ld ⸮ Any idea what else could be done?

Anonymous · Answer

It looks as if the program does not start at all. Check this by uploading some simple example program e.g. blink.

kaimaz · Answer

sample blink works without a problem : Code: text Expand Select all Copy to clipboard/*   Blink   Turns an LED on for one second, then off for one second, repeatedly.   Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO   it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to   the correct LED pin independent of which board is used.   If you want to know what pin the on-board LED is connected to on your Arduino   model, check the Technical Specs of your board at:      modified 8 May 2014   by Scott Fitzgerald   modified 2 Sep 2016   by Arturo Guadalupi   modified 8 Sep 2016   by Colby Newman   This example code is in the public domain.    */ // the setup function runs once when you press reset or power the board void setup() {   // initialize digital pin LED_BUILTIN as an output.   pinMode(LED_BUILTIN, OUTPUT); } // the loop function runs over and over again forever void loop() {   digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)   delay(1000);                       // wait for a second   digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW   delay(1000);                       // wait for a second } . I don't know why that one doesn't work. And I already have everything soldered together a bit pointlessly. But maybe still a board to save I'll leave the radio and the d1 mini alone is enough for me. I will power it 5v to 5v and gdn to gdn. for this i want to write an app and if someone clicks in the app open it will command a voltage of for example 3.3v from pin?or from 3v3? any idea how to do this?

Anonymous · Answer

Please show again what the logs look like when uploading the receiver code, which then generates messages in Serial Monitor, as in post #17.

StaryVirus_e_Wiarus · Answer

Hi This receiver from post #13 does not pass 115200 b/s. Its maximum capability is probably 4800 b/s. And one more thing: your remote works on 433 MHz or 315 MHz. The receiver can operate on either. They were made on 433 MHz or on 315 MHz. They differed by some component.

Anonymous · Answer

. Nowhere in the code is the speed of the RF receiver set. Added after 5 [minutes]: A description of the receiver and transmitter is attached.

StaryVirus_e_Wiarus · Answer

Here you go:Code: C / C++Log in, to see the code

Anonymous · Answer

. Well then please explain to us all now what this speed setting is on the RF receiver, which is not connected to Serial in Wemos. I will also mention that without the Serial.begin() line, the RF receiver will also work. To make things easier: the source codes of the rc-switch library are here:

How do I receive data from a remote control on a Wemos D1 Mini with a 433MHz RF module?

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