Electronics > Projects, Designs, and Technical Stuff

Reverse Engineering central heating wireless thermostat - help needed!

<< < (5/9) > >>

picitup:
Well this has sparked some interesting debate! I'm learning loads!

@philpem that's a very impressive piece of reverse engineering.  Unfortunately I only have a budget scope and look at mixed signal scopes and drool.  I don't have a Salea sniffer either, but it's nearly xmas....

You can buy 833MHz receivers from fleabay for a couple of quid so I may well buy one and just see if it works.

I'd still like to pursue this and the idea of reverse engineering it sounds like fun, I think I could learn a lot from that.  Can I ask which Salea sniffer you have philpem?

Cheers

Steve



ataradov:

--- Quote from: picitup on December 02, 2015, 09:19:28 pm ---You can buy 833MHz receivers from fleabay for a couple of quid so I may well buy one and just see if it works.
--- End quote ---
I can guarantee you, it won't.

senso:
You can also buy a cheap RTL-SDR, or even use an equal atmega128rfa/rfr and use Wireshark.

ataradov:

--- Quote from: senso on December 02, 2015, 09:49:31 pm ---You can also buy a cheap RTL-SDR
--- End quote ---
Which one and what is your definition of cheap?


--- Quote from: senso on December 02, 2015, 09:49:31 pm ---, or even use an equal atmega128rfa/rfr and use Wireshark.
--- End quote ---
No, you can't. RF212 is a sub-GHz device. megaRF are only available in 2.4 GHz band.

You can use this USB stick http://www.atmel.com/tools/atzb-x-rf212b-usb.aspx with Wireshark. But it is $55 before taxes and shipping.

mark03:

--- Quote from: ataradov on December 02, 2015, 08:45:44 pm ---
--- Quote from: mark03 on December 02, 2015, 08:14:30 pm ---I'm assuming a "proper sniffer" costs well over the $20 one those dongles will set you back.
--- End quote ---
$50 at least. Do you have a link to a $20 SDR receiver?

--- End quote ---
$12.75 + shipping: http://www.amazon.com/RTL-SDR-DVB-T-Stick-RTL2832U-R820T/dp/B00C37AZXK
The RTL-SDR dongles (all based on the same digital TV tuner chip and its clones, I believe) are even cheaper now than I remember.  I'm not saying this is necessarily the right tool.  Because the radio is separate from the MCU it sounds as though sniffing the SPI bus would be just as useful, or just as useless (depending on encryption as you say).  But these very simple tuners have allowed folks to do things like reverse-engineer the transmissions from the tire-pressure monitoring systems in their car, and other fun stuff.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod