Category Archives: RF

Doing some RF spectrum analyser stuff

Having experienced some major WIFI problems over the years, with the overly crouded 2.4 ISM band. I decided to dust of the good old CC2500 chip, and get it running, properly. The reason for this chip? the 8-bit RSS value you can acquire from it. These day’s, the very cheap NRF24L01+ is rather nice, and cheap, but with a 1bit RSSI ‘threshold’, not very useful for these kind of setups.

rfexplorer
RFExplorer

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Sniffing Chinese wireless 433 modules

In an attempt to get some really nice Cheap wireless led-drivers I decided to buy some of these 433mhz transmitters:

led_remote_433mhz-ebay

Thinking I could sniff-out the protocol, and use these babies a s a nice ultra-cheap home-automation node.

So after taking apart the remote and wireing up the led (yes, those Chinese guy’s are awesome!, they wired a led on the antenna input, so sniffing out the signal (without noise) was peanuts). They probably replace the blue (why always blue leds in cheap Chinese stuff), with an IR version in the even cheaper IR models.

Transmitter-433-inside

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