[OpenTRV-dev] Mobile phone detector

[Damon Hart-Davis]

Fab, thanks!

All as Deniz says, and with the circuitry to be capable of running on at most tens of microwatts average (we might be able to sample for a few seconds every few minutes) at ~2.4V to work nicely with some variant of our V0p2 board running from 2xAA NiMH or other similar low-power microcontroller.

(We could even harvest a small amount of power to inject back into batteries or a supercap as a secondary consideration!)

Rgds

Damon


> On 8 Oct 2015, at 22:16, Kevin Wood <kevin at the-wood-family.com> wrote:
> 
> Hi guys,
> 
> Currently on holiday but my day job is developing systems to test mobile
> phones.
> 
> I'll give this some thought.
> 
> Kevin
> 
> Hi All,
>> 
>> Damon has asked me to do a bit of research into using a mobile phone
>> detector as a presence sensor for the bus shelters.
>> 
>> The basic idea is an antenna, and an amplifier/filter tuned to the
>> appropriate frequency. Additionally we'd need some kind of conditioning
>> to get the output into a microcontroller readable format.
>> 
>> Does anyone have any thoughts on how practical this would be for sensing
>> whether there are people waiting?
>> 
>> Regards,
>> 
>> Deniz
>> 
>> P.S. A quick google for how the detectors work gave me the following
>> results:
>> http://www.eeweb.com/project/circuit_projects/cell-phone-detector
>> http://www.electroschematics.com/1035/mobile-bug-detector-sniffer/
>> http://www.instructables.com/id/Free-Energy-Cellphone-detector-From-Cellphone-An/
>> http://www.instructables.com/id/VHF-UHF-RF-Sniffer/?ALLSTEPS
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>> 
> 
> 
> 
>