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zeitgeist87 / RFReceiver

An Arduino library for low-cost 433 MHz receiver modules with a focus on reliable one-way communication and forward error correction
GNU General Public License v3.0
56 stars 12 forks source link

Can't receive packets from unmarked chip #5

Closed Nihlus closed 6 years ago

Nihlus commented 6 years ago

I have a small 433mhz keyfob with an unmarked chip, and I'm trying to receive data packets from it so that I can retransmit them later. Unfortunately, I can't seem to get any library to recognize it. I know that it's 433 mhz since the clock crystal on the board is marked.

I've tried both the blocking and non-blocking versions of the test code. I know that my receiver is getting something (I've temporarily hooked up an LED to the data pin for debugging purposes, and I can clearly see a flash when I use the keyfob). However, no packets are recognized.

Any pointers on what to look for or what to try? This is my first foray into RF transmission and reception with the Arduino, so I am a little lost.

zeitgeist87 commented 6 years ago

Hi @Nihlus,

The RFReceiver can only receive packets from the RFTransmitter library, because both speak the same protocol. You need a library that understands the protocol your keyfob speaks. It is not just about the packet format, but also about how the individual bits are encoded. Unfortunately, I have no experience with these keyfobs and can't tell you which library will work.

Nihlus commented 6 years ago

Ah, I see - thank you for the explanation. I did eventually manage to figure it out with a bit of probing around, and it turns out my fob was a bit of an oddball anyway. I used rc-switch in the end with a custom protocol.

All is well :)