I want to try to design a circuit to mute/pause my Ipod when my cell phone is either ringing og recieves an SMS. I have a fairly good idea of how to achieve the muting/pausing of the Ipod. But I'm at a loss on how to detect the GSM signal. Can anyone help me with this?
Just to specify: I'm not after decoding the information in the GSM signal. I just want to detect that my phone recieves a call or an SMS, so I can use this to trigger a reaction in a PIC program.
I've seen stickers and "jewlery" sold in stores, that has a LED that blinks when the cell phone is transmitting. So I gather there's some kind of antenna in the sticker, and that the cell phone signal from the phone induces enough energy for the LED to blink. I was thinking about just buying such a sticker, and start dissecting it with my sledge hammer and pickaxe. ;D
Just to specify: I'm not after decoding the information in the GSM signal. I just want to detect that my phone recieves a call or an SMS, so I can use this to trigger a reaction in a PIC program.
I've seen stickers and "jewlery" sold in stores, that has a LED that blinks when the cell phone is transmitting. So I gather there's some kind of antenna in the sticker, and that the cell phone signal from the phone induces enough energy for the LED to blink. I was thinking about just buying such a sticker, and start dissecting it with my sledge hammer and pickaxe. ;D
