I connected a 433MHz receiver directly to computer microphone port and powered it on (aka poor man's oscilloscope). Then I used Audacity to record at 48kHz the raw signal coming in and pressed the different buttons on the remote.
A sample of what a single broadcast looks like:
Resolution 48000 Hz - 1 sample is 20.83us
form | samples | duration | symbol |
---|---|---|---|
Up | 16 | 333us | U |
Short down | 10 | 208us | - |
Long down | 58 | 1208us | D |
Start
U D D
_
| |_________________
"Zero" bit
U U D
_ _
| |_| |_______
"One" bit
U D U
_ _
| |_______| |_
End
U
_
| |
UDD UUD UUD UDU UUD UDU UUD UUD UDU UDU UUD UUD UUD UDU UDU UUD UDU UUD UUD UUD UUD UDU UDU UDU UDU UDU UUD UUD UDU UUD UUD UUD UUD U
S 0 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 0 0 0 0 1 1 1 1 1 0 0 1 0 0 0 0
UDD UUD UUD UDU UUD UDU UUD UUD UDU UDU UUD UUD UUD UDU UDU UUD UDU UUD UUD UUD UUD UDU UDU UDU UDU UDU UUD UUD UDU UUD UUD UUD UDU U
S 0 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 0 0 0 0 1 1 1 1 1 0 0 1 0 0 0 1
UDD UUD UUD UDU UUD UDU UUD UUD UDU UDU UUD UUD UUD UDU UDU UUD UDU UUD UUD UUD UUD UDU UDU UDU UDU UDU UUD UUD UDU UUD UUD UDU UUD U
S 0 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 0 0 0 0 1 1 1 1 1 0 0 1 0 0 1 0
UDD UUD UUD UDU UUD UDU UUD UUD UDU UDU UUD UUD UUD UDU UDU UUD UDU UUD UUD UUD UUD UDU UDU UDU UDU UDU UUD UUD UUD UUD UUD UUD UDU U
S 0 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 1
on/off channel
L1 on 0 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 0 0 0 0 1 1 1 1 1 0 0 1 0 0 0 0
L2 on 0 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 0 0 0 0 1 1 1 1 1 0 0 1 0 0 0 1
L3 on 0 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 0 0 0 0 1 1 1 1 1 0 0 1 0 0 1 0
L2 off 0 0 1 0 1 0 0 1 1 0 0 0 1 1 0 1 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 1
- Each press of a button transmits four times the same message
- Each message starts with the
start
sequence and then has 8 * 4 bits payload, followed by a singleend
sequence - 6 * 4 bits header
- 4 bits on/off command (1001 on, 1000 off)
- 4 bits channel designation
- There's a 10ms break between messages
- One message is about 71ms long