Making a base station compatible transmitter

[karioja]

Did you ever manage to implement a base station compatible OS V3 transmitter? I've implemented a THGR810 temp sensor (using https://github.com/epkboan/rain_sensor as a basis) and I'm able to receive the data using my own custom Arduino receiver as well as using a RTL-SDR dongle (using rtl_433). However my WMR86 base station fails to receive the data. I've captured the waveforms (my own transmitter and a real THGR810) with rtl_433 and visualized them using http://triq.net/iqs. They seem identical. Any hints?

[robwlakes]

This is really interesting karioja. You have gone a step further than me. I felt I could emulate an OS sensor if I needed to but had not tried to do it (eg use the temp gauge on the LCD base station to show tank water level). The protocol that carries the information may be detectable by us for the usual data capture, however the initialisation of the sensor when the reset button is pressed, may send a slightly different data payload to confirm the registration of the new ID for that sensor.

I don't worry about the "station ID" usually as my OS system is the only one around us. I would use your capture system to look at the first signal after the reset has been pressed and check it. It may shuffle the payload, add extra bits or even have a total repeat of the payload (my first BIOS weather station's error checking was just to send the whole payload 3 times, if I got it twice the same I assume it was 'good').
I will be fascinated to hear of your progress.
Rob