Electrical hardware design of a little interface - Simulating a Microphone for an Iphone
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Hi, We are looking to have an easy hardware interface for plugin to an Iphone. We have a little sensor unit, that provides a clear rectangle signal with 3V peak to peak. What we need now is to give this signal to an Iphone through the microphone mini jack input, as we want to use this signal with an existing Iphone software.
What we know by now is, that we could use the standard microphone, tap on the microphone and the software does recognize this signal. We need someone who is able to provide a very simple way of damping the 3V peak to peak rectangle signal to a signal that is similar to the microphone signal.
Your job is to provide a detailled hardware plan of this interface with wiring plan with which we can use our sensor unit and plug it in to an iphone, as follows:
EXISTING SENSOR WITH 3 CONNECTORS (GND, VCC-3V, SIGNAL-OUTPUT) - Power supply by battery
>>>> YOUR INTERFACE with Mini-Jack (4-poles)
THE GOAL IS THAT YOU PROVIDE AN IDEA THAT IS AS SIMPLE AND CHEAP AS POSSIBLE.
If necessary, we would even be able to send you a sample of our sensor unit. We will be able to forward to hear your quotes.
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