Bit encoding of WS7000 Lacrosse sensors

Signals are transmitted on 433MHz, AM (Amplitude Modulation), OOK (On/Off Keying):

• On = signal 1
• Off = signal 0

Global view of the signals:

• Bit0 encoding is 2/3 one and 1/3 zero
• Bit1 encoding is 1/3 one and 2/3 zero

The measures are approximated, and may vary from sensors to others.

The measures have been done with the logic analyzer described here

Detail of a bit0. Length of each bit is #1200uS, #800uS one and #400uS zero:

 

Detail of a bit1. Length of each bit is #1200uS, #400uS one and #800uS zero:

 

Contact: Jean-Paul ROUBELAT - F6FBB

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