ESP32 Forum

Hi Forum,

I want to my use my ESP32 to sniff 433Mhz traffic. With the aim to eventually use it to control a RF device by independently transmitting and receiving 433 Mhz data.

I have been reading the forum and using the RMT is suggested approach. Since 443MHz is a very used spectrum, I would need to handle all data? Not just my devices message formats.

I am looking at first use to RXB6 or CC1101 for sniffing? Are there any examples of sniffing 433 Mhz data with RMT on ESP32?

Thanks
Josh

It really depends on what sniffing means in your case. In the 433 MHz band, the traffic you want to sniff must be using some modulation mechanism that you want to target. Suppose the traffic is just OOK type (RC cars, home appliance remote control, etc), then you will need an OOK receiver (433 MHz), and the output can be read in by the RMT.

More complex modulation schemes with a high data rate will need you to use a 433 MHz radio with I2C or SPI interface (like the TI CC chip you were planning on using). The ESP32 can read the data captured by that chip.