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Remote Controlled Signal Blocker.
Effective tool to remotely block a 433MHz Keyfob in order to capture the rolling code using a Hackrf One Portapack with Mayhem firmware.
Here the Relay is turned off using WiFi
Here the WiFi turned the Relay ON which blocked the 433MHz Signal.
/*
* ESP8266 (WeMosD1) WiFi Relay Control
*
* learnelectronics
* 05 JUN 2017
*
* www.youtube.com/c/learnelectronics
* arduino0169@gmail.com
*/
#include <ESP8266WiFi.h>
const char* ssid = " //put ssid here";
const char* password = "//put password here";
int ledPin = D5;
WiFiServer server(80);
void setup() {
Serial.begin(9600);
delay(10);
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, LOW);
// Connect to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Start the server
server.begin();
Serial.println("Server started");
// Print the IP address
Serial.print("Use this URL : ");
Serial.print("http://");
Serial.print(WiFi.localIP());
Serial.println("/");
}
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}
// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}
// Read the first line of the request
String request = client.readStringUntil('\r');
Serial.println(request);
client.flush();
// Match the request
int value = LOW;
if (request.indexOf("/LED=ON") != -1) {
digitalWrite(ledPin, HIGH);
value = HIGH;
}
if (request.indexOf("/LED=OFF") != -1){
digitalWrite(ledPin, LOW);
value = LOW;
}
// Return the response
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println(""); // do not forget this one
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.print("Led pin is now: ");
if(value == HIGH) {
client.print("On");
} else {
client.print("Off");
}
client.println("<br><br>");
client.println("Click <a href=\"/LED=ON\">here</a> Turn relay ON<br>");
client.println("Click <a href=\"/LED=OFF\">here</a> Turn relay OFF<br>");
client.println("</html>");
delay(1);
Serial.println("Client disconnected");
Serial.println("");
}
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