Reverse engineering ELRO DB280 Doorbel - Revision history

Fish: Added Category

2013-04-22T13:31:36Z

Added Category

Fish at 09:45, 12 December 2012

2012-12-12T09:45:07Z

Fish: Intro for Arduino code for ELRO DB280 doorbel

2012-12-12T09:43:26Z

Intro for Arduino code for ELRO DB280 doorbel

Fish: Added Arduino code for sending doorbel signals

2012-12-12T09:40:55Z

Added Arduino code for sending doorbel signals

Fish: Picture adjustment & type

2012-09-25T20:04:46Z

Picture adjustment & type

Fish: Initial reverse enginering Elro DB280 doorbel page

2012-09-25T19:54:12Z

Initial reverse enginering Elro DB280 doorbel page

New page

[[File:elro_db280.jpg]]

The ELRO DB280 is a doorbel system with a wireless remote.
The system has a fixed code, although it can be changed quite easily by changing some "solder bridges"

We analyzed the wireless signal with an Logic analyzer and a 433 receiver.

The jumpers are set:
10000100

After analysing the pulses with the logic analyzer we do see the following
0001010101000101010101010

If we invert the set jumpers and we the code 1 character we see the following:
0 1 1 1 1 0 1 1
0001010101000101010101010

We can conclude:
*Every pulse uses a 0 in front
*The code is inverted (or it's default up unless it's brought to the ground)
*There is a trailer: "010101010"

← Older revision		Revision as of 13:31, 22 April 2013
Line 84:		Line 84:
	}		}
	</pre>		</pre>
		+	[[Category:Projects]]
		+	[[Category:Reverse enginering]]

@@ Line 20: / Line 20: @@
 *The code is inverted (or it's default up unless it's brought to the ground)
 *There is a trailer: "010101010"
 <pre>
   /*
-  This is Fish_ his DoorbelGOon code 0.1
+  This is Fish_ his DoorbelGOon code 0.1, if you change it, let me know so we can create better verions.
   More info check @fish_ on twitter
   */

← Older revision		Revision as of 09:40, 12 December 2012
Line 20:		Line 20:
	*The code is inverted (or it's default up unless it's brought to the ground)		*The code is inverted (or it's default up unless it's brought to the ground)
	*There is a trailer: "010101010"		*There is a trailer: "010101010"
		+
		+	<pre>
		+	/*
		+	This is Fish_ his DoorbelGOon code 0.1
		+	More info check @fish_ on twitter
		+	*/
		+	int rfout=12; //rf output pin
		+	int status=13; //status pin
		+	int longwait=0; // declare the longwait int
		+
		+	void setup() {
		+	// Open serial debug communications and wait for port to open:
		+	Serial.begin(9600);
		+
		+	pinMode(rfout, OUTPUT); //Define rf 433 transmitter pin
		+	pinMode(status, OUTPUT); //Define status LED
		+	digitalWrite(rfout, LOW); //extra check that output is LOW
		+
		+	void loop() {
		+
		+	// Set up a Pulse String of the doorbel
		+	String stringOne = "0001010101000101010101010"; //first digit is ignored
		+	int highpulse=750; // Length of the 1 pulse
		+	int highbreak=300; // Length of the 1 break
		+	int lowpulse=250; // Length of the 0 pulse
		+	int lowbreak=900; // Length of the 0 break
		+
		+	int offtime=1; // Declare the offtime integer
		+	int ontime=1; // Declare the ontime integer
		+	int pulselength=25;
		+
		+	Serial.println(stringOne); //Debug output
		+	Serial.println(); //Debug enter
		+
		+	int pulses=0; // Declare the pulses integer
		+
		+	//This Block gets the 0 or 1 of the string and sets the pulse and break time
		+	while(pulses < pulselength) {
		+	if (stringOne.substring(pulses,(pulses+1)) == "0") {
		+	ontime=highpulse;
		+	offtime=highbreak;
		+	} else {
		+	ontime=lowpulse;
		+	offtime=lowbreak;
		+	}
		+	pulses++;
		+
		+	//This Block sends the output to the 433 transmitter
		+	digitalWrite(rfout, HIGH); // pulse on
		+	delayMicroseconds(offtime);
		+
		+	digitalWrite(rfout, LOW); // put pulse on low
		+	delayMicroseconds(ontime);
		+
		+	}
		+	digitalWrite(rfout, LOW); // be sure the puls is off (INVERTED!!)
		+	delay(10); // delay for next pulse series
		+	longwait++; // add 1 to the longwait value.
		+	if (longwait>10) {longwait=0; delay(500);} //used for send the next batch of pulses
		+	}
		+	</pre>

← Older revision		Revision as of 20:04, 25 September 2012
Line 1:		Line 1:
−	[[File:elro_db280.~~jpg~~]]	+	[[File:elro_db280.png\|300px]]

	The ELRO DB280 is a doorbel system with a wireless remote.		The ELRO DB280 is a doorbel system with a wireless remote.

@@ Line 3: / Line 3: @@
 The ELRO DB280 is a doorbel system with a wireless remote.
 The system has a fixed code, although it can be changed quite easily by changing some "solder bridges"
+=433 Signal encoding=
 We analyzed the wireless signal with an Logic analyzer and a 433 receiver.