Hi all, im a total newb to electronics and making my own circuits, however ive recently made a 555 monostable circuit to basically 'Press' a button and hold it down, on a cell phone.
The action of pressing and holding activates speed dial assigned to that button.in turn calling the number set.
The idea is to have an alarm system trigger the circuit, which makes the 555 timer do the work.
Now, i have tried a 4 pin optoisolator.. it didnt work, i tried a relay and this didnt work because i cant drive the relay properly, i really dont know what im doing..
can anyone suggest a way of 'bridging' the 2 contacts on the phones motherboard via the 555 timers output signal? ive lost alot of bits but have some bc547 transistors left over, i can buy the bits of salvage them if they are readily available..
i would really like to finnish this circuit so that i can fit it to my car which has recently been broken into, i will use the system as a pager.
thanks, and great forum, any help would be greatly appriciated
Jay