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Oct 9, 2014 at 11:36 comment added Pratham Kumar KyranF ...LDR is a good idea ... I will take out the front cover of the phone and place the LDR inside near an LED. Thanksss a lot .. It wud work and cost effective and easy for a kid to understand and LDR.
Oct 9, 2014 at 11:32 comment added Pratham Kumar Yes JRE .. I have opened an old Nokia set and looks I can solder out the vibrator from it and take two wires from it. It will never vibrate in future though.
Oct 9, 2014 at 11:02 comment added KyranF @PrathamKumar you try to use vibration sensors, or a microphone with a simple 'noise level' trigger for the 555 timer circuit etc. These are non-destructive methods. You can also assume the screen of the phone will light up during a call, and go dark after the call. Using a very simple Light dependent resistor (LDR), plus an operational amplifier to turn the LDR voltage into a useful signal, you can directly (using a high side power switch as shown by TJ's answer) turn on a light of some kind. It will turn off after the call and the screen goes dark. no need for timer ;)
Oct 9, 2014 at 10:59 comment added KyranF @JRE of course, but who knows what tools and methods will be used? Better to tell him that the phone used will most likely not be very good afterwards, then give false hope lol.
Oct 9, 2014 at 10:54 comment added JRE @KyranF no need to destroy the phone just to get at the connections - you will have to open it, though. With proper tools and care you can open a phone and reassemble it.
Oct 9, 2014 at 10:52 comment added Pratham Kumar I will use a basic phone .. Not an iPhone ;),.. Yes, I will break one phone to get the trigger signal. Okay, so we need a timer circuit for sure. Noted on that. Do you have a better idea? Using DTMF wud involve arduino ... That's going to be a headache. Hmm.. Anything like a ready to use vibration sensor which senses the vibration of the phone and activates a timer/relay/DC bulb/motor... Anything ?
Oct 9, 2014 at 10:43 comment added KyranF it's not easy, as using the call (ring tone, speaker output) or the phone vibration events are only at the start. You will need an external timing circuit to hold the lights on for a certain time. The other issue is getting access to the phone signals, you will have to destroy the phones to get access to the vibration motor connections or the speaker connections.
Oct 9, 2014 at 10:41 comment added Pratham Kumar I want to use the phones as a trigger only, no if the bulb switches off after the call ends.. No problem. Power can be drawn from a 6v-12v battery or AC 230 v socket. I will get the bulb accordingly.
Oct 9, 2014 at 10:24 comment added KyranF how will the behaviour of these lights work, will they stay on forever after being triggered? will they need a timer? How are you going to access the "power" from the phones?
Oct 9, 2014 at 10:18 comment added Pratham Kumar Okay ... Let us make it more simple ... My neice needs a school project. An AC/ DC bulb is to be switched on using two remote mobile phones. Time is not a factor. To eliminate the musical relay effect, can we use the power used for vibrator motor in a mobile? Ckt shud be as easy as for a kid to handle. Like using a couple of relays, bjts etc.
Oct 9, 2014 at 10:01 history answered KyranF CC BY-SA 3.0