You will need to provide a lot more detail about what you are hoping
to do. Sensing something 1inch away is quite a different task from
something 1 mile away. The purpose of your efforts are also important
to know. Have you done any searches on the internet?
You don't need to reinvent the wheel but study reversed engineered
Take a physical circuit that does what you want it to do and send it
to the reverse engineering company as listed on IRleds.
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