Doorbell with energy-harvesting button

[TheChatty]

I've got some doorbells whose buttons have no battery, i.e. they harvest energy when a user pushes the button.

I can't get it to get decoded. Here are some samples:
Samples.zip

[zuckschwerdt]

The signal is badly clipping (too loud), remove the antenna, add more distance or set a low manual gain.

Also you are hitting the frequency dead on. DC will not work well, try to offset by e.g. 20k - 30k (-f 433.90M or -f 433.89M)

And then these senders usually are very fast to conserve energy, set a higher rate, e.g. -s 1024k

[TheChatty]

Samples.zip
I recorded all bells now. From the neighboring room.

[zuckschwerdt]

Still "too loud" and you really need -f 433.90M

[TheChatty]

This time I shifted frequency and moved stepwise away from sender till I got no reception anymore.
Samples-no-antenna.zip

[zuckschwerdt]

It looks like a simple PWM 50/150 µs signal. This will work:
rtl_433 -R 0 -X 'n=name,m=OOK_PWM,s=50,l=150,g=200,r=3000,bits>=24'
Or to match exactly this one button use:
rtl_433 -R 0 -X 'n=name,m=OOK_PWM,s=50,l=150,g=200,r=3000,bits>=24,match=e0d50d,countonly'

Write a conf documented conf file and open a PR to include that if you like.

[TheChatty]

Bell 1 and 2 can be received with the above command when -s 1024k is set. This is the specific product.

Bell 3 is this type and seems to need a different decoder.

[gdt]

Do we have a place to store these flex configs? Open issues don't seem like the right place!

[Cyberbeni]

I have this doorbell: link

The decoder mentioned above worked fine after also adding -s 1024k

[zuckschwerdt]

If you have the time please write a documented conf file as suggested and PR.

[TheChatty]

I filed this PR #2940.