Reverse engineering ELRO HA51 wireless: Difference between revisions
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[[File:Elro_HA51_433_allon_alarmoff.png]]<br> | [[File:Elro_HA51_433_allon_alarmoff.png]]<br> | ||
As you can see, the first pulse is always short, the next 8 pulses is the code of the system, dip "off" is a small pulse, a wide pulse is dip "on". | As you can see, the first pulse is always short, the next 8 pulses is the code of the system, dip "off" is a small pulse, a wide pulse is dip "on". | ||
<br> | |||
Also we have seen the last 4 pulses are used to control the system: | Also we have seen the last 4 pulses are used to control the system:<br> | ||
Wide=1 | Wide=1<br> | ||
Small=0 | Small=0<br> | ||
<br> | |||
System off: 1100 | System off: 1100<br> | ||
System on: 1110 | System on: 1110<br> | ||
System Delayed on: 1011 | System Delayed on: 1011<br> | ||
Panic button: 0011 | Panic button: 0011<br> | ||
<br> | |||
Other codes will be added after analysing (PIR, door detection etc) | Other codes will be added after analysing (PIR, door detection etc) | ||
Revision as of 19:37, 30 July 2012
What is it
It's a alarm system, used with wireless accessories. We have a central and a remote control:
Setup
We opened the device, no internal alarm trigger's where used. The system contains 2 board:
- Logic board
- 433 receiver
We hooked up a logic analyzer on the 433 receiver board to "snif" the datastreams:
We opened the remote to change the dipswitches:
Results
After sniffing a few times this the result:
"Put alarm off" with all dips off:
"Put alarm off" with all dips on:
As you can see, the first pulse is always short, the next 8 pulses is the code of the system, dip "off" is a small pulse, a wide pulse is dip "on".
Also we have seen the last 4 pulses are used to control the system:
Wide=1
Small=0
System off: 1100
System on: 1110
System Delayed on: 1011
Panic button: 0011
Other codes will be added after analysing (PIR, door detection etc)