[hackspacebristol] RF question

matthew venn matt at mattvenn.net
Wed Feb 27 10:23:22 UTC 2013


James,
any help would be appreciated, but I'm not about Thursday. You around any
other times?
Matt

On 27 February 2013 07:25, James Torbett <james at torbett.co.uk> wrote:

> Tricky as the silabs chip includes the uP so you can't sniff the i2c
> stream that sets it up. Might need a rather expensive oscilloscope to sniff
> the rf.
>
> Bring it thurs perhaps?
> On Feb 26, 2013 4:51 PM, "matthew venn" <matt at mattvenn.net> wrote:
>
>> Hi all,
>>
>> I've got a radio question for you. I'm trying to get a feed from a GEO (
>> http://www.greenenergyoptions.co.uk/) ensemble energy monitor.
>> The energy monitors use this chip:
>> http://www.silabs.com/Support%20Documents/TechnicalDocs/Si1012-A-short.pdf
>> And on their website they specify 868Mhz:
>> http://www.greenenergyoptions.co.uk/what-we-do/products/comptable/ (see
>> the ensemble product)
>>
>> They don't specify the modulation, but the SI chip supports one of FSK,
>> GFSK, and OOK.
>>
>> I've setup an rfm22b radio (http://www.hoperf.com/rf/fsk/RFM22B.htm) and
>> have tried snooping at 868Mhz using all the above modulation modes.
>> I'm not picking anything up.
>>
>> I've verified my radio is working (by pairing it with an identical radio
>> and sending message) and that the ensemble stuff is working (turn on and
>> off lamps etc).
>>
>> I don't know much about radio, so perhaps what I'm trying to do isn't
>> feasible?
>> Any ideas why I'm not seeing anything?
>>
>> Matt
>>
>> --
>> Matthew Venn
>> mattvenn.net
>>
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>>
>>
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-- 
Matthew Venn
mattvenn.net
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