I'm trying to read the signal that a commercial 433MHz PIR is sending when triggered in order to understand when someone is moving and thus perform an action.
First of all, I've opened the PIR box and connected the pin that goes to the antenna with the Arduino Uno, trying to understand the signal sent when triggered before going through the antenna . I can do this because the internal antenna is a separate chip, connected to the PIR main board through 3 pins (Vcc GND Data) . It works with 2xAA batteries (3V) and it has a led that indicates when it is triggered.
The problem though is that I don't know anything about this code and I'm having hard times trying to understand it: if I simply try to read the AnalogRead from the DATA pin, I'm only getting values between 0.9V and 1.4V, which don't make sense in a 3v3 logic. Probably I'm doing something wrong.
Any idea on how can I try to read and understand the code?? I suppose it should contain at least an unique ID sequence (since you can connect multiple PIRs to the server) + the status of the sensor + some control bit.
If you need more info, just let me know.
Thanks in advance for your help!