I would like a design engineer to develop a device (with schematic and BOM) that will allow me to enter a number on a lightweight keypad and have the number show up on a small led display that is remotely located. There needs to be a way to individually setup the device so that someone else with the same device will not be able to see the numbers on their device.
The devices should be battery powered, small, and lightweight.
The keypad should be small and flat but not so small that it will be difficult to enter the numbers with an adult finger.
The receiving device should be small and flat (possibly with a watch type battery)