ESP8266 Community Forum

Posted: **Thu May 27, 2021 4:15 pm**

Hello,

I am trying to use an ESP8266 to send data via 433MHz to my PI, and I have a rather basic problem ...

On the PI I am checking with "sudo rtl_433 -F json" if data is received.

I am using the example from: https://github.com/puuu/ESPiLight/blob/master/examples/Transmit/Transmit.ino
rf.send("elro_800_switch", "{\"systemcode\":17,\"unitcode\":1,\"on\":1}");
rf.send("elro_800_switch", "{\"systemcode\":17,\"unitcode\":1,\"off\":1}");

But on the PI I am only getting data like:
{"time" : "2021-05-27 22:41:32", "model" : "Waveman-Switch", "id" : "O", "channel" : 4, "button" : 1, "state" : "off"}
{"time" : "2021-05-27 22:41:32", "model" : "Waveman-Switch", "id" : "O", "channel" : 4, "button" : 1, "state" : "off"}

so the data I am trying to send is not visible via rtl_433

Any clue what I am doing wrong ?

Thanks,
Ralf

Posted: **Thu May 27, 2021 11:13 pm**

the ESP8266 is a Wifi chip, it's not 433MHz - do you have a separate 433MHz transmitter module attached?

What's your circuit look like?

Posted: **Fri May 28, 2021 2:12 am**

Hi,

yes, I have a 433 sender connected to my ESP, and I see that data is received on my PI:
{"time" : "2021-05-28 09:09:03", "model" : "Waveman-Switch", "id" : "O", "channel" : 4, "button" : 1, "state" : "off"}
{"time" : "2021-05-28 09:09:03", "model" : "Waveman-Switch", "id" : "O", "channel" : 4, "button" : 1, "state" : "off"}
So teh 433MHz sender is connected correctly

But the problem is that that the data received on the PI is always the same. So the data I want to send is not
displayed.

Here is my esp code:

Code: Select all

#include <ESPiLight.h>

#define TRANSMITTER_PIN 5

ESPiLight rf(TRANSMITTER_PIN);

void setup() { 
}

void loop() {
  rf.send("elro_800_switch", "{\"systemcode\":17,\"unitcode\":1,\"on\":1}");
  delay(2000);
  rf.send("elro_800_switch", "{\"systemcode\":17,\"unitcode\":1,\"off\":1}");
  delay(2000);
}

Posted: **Fri May 28, 2021 8:06 am**

As davydnorris posted

the ESP8266 is a Wifi chip, it's not 433MHz - do you have a separate 433MHz transmitter module attached?

The ESPiLight read.me states:-

Requirements
This library was tested and developed for the ESP8266. It may not run on a ATmega-based boards, because of memory usage.

For transmitting and receiving you need 434MHz-RF modules. .........

So what module are you using?

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