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petkow · 08-09-2009, 13:46

Thanks for that. The first one really is an interesting device. Pity there isn't a PSTN line where I want to set this up, but I suppose the gateway is a viable addition.

Its a little bit pricier than the ueber-crude option that I was initially planning which was to have some sort of an LDR or light sensor which is placed in front of the mobile phone screen. The backlight could then trigger my circuit when the phone was called for example. But there are just way too many things which could go wrong, such as other calls (wrong numbers) as well as other ordinary mobile functions which trigger the light such as low battery etc. However I have just discovered that some electronics hobby shops actually sell something based on this crude principle.

There just must be some better dedicated "box of tricks" based on gsm (and not pstn) technology available somewhere?

	(#1)
petkow (Offline) Senior Member Prepaid Pioneer Posts: 696 Join Date: 01 Aug 2006 Location: Madrid Country:	08-09-2009, 13:46 Thanks for that. The first one really is an interesting device. Pity there isn't a PSTN line where I want to set this up, but I suppose the gateway is a viable addition. Its a little bit pricier than the ueber-crude option that I was initially planning which was to have some sort of an LDR or light sensor which is placed in front of the mobile phone screen. The backlight could then trigger my circuit when the phone was called for example. But there are just way too many things which could go wrong, such as other calls (wrong numbers) as well as other ordinary mobile functions which trigger the light such as low battery etc. However I have just discovered that some electronics hobby shops actually sell something based on this crude principle. There just must be some better dedicated "box of tricks" based on gsm (and not pstn) technology available somewhere?