Electronic Circuit, Firmware and PCB Design/Test

Project Overview: • Develop a circuit • Develop microcontroller firmware for simple functionality** • Advise on component selection (cost and obsolesce risks are key). I have some key components already selected. • Layout board no bigger than 1.25 in [31mm] dia • generate and supply Gerber and BOM files • Build up prototype • Basic prototype tests • Supply support, as-needed for advice with integration of board into product (~ 2-8 hrs) • All materials are to be purchased by me, the client **Firmware Simple Functionality: 1) Initially, circuit is dormant, not looking for “event” switch signal 2a) Little micro push button (attached to the board) is pushed and now circuit is monitoring for “event” signal. Looks for “event” signal once every 0.25 seconds. 2b) Alternate configuration: No push button switch. Instead, hall effect sensor is triggered, when pulled away from its magnet, to cause circuit to monitor for “event” signal once every 0.25 seconds. 3) The “battery charge level” LED will then indicate charge state of the 3V on-board battery for 10 seconds, by either using: a) two color LED OR b) one color LED flashes to indicate how much charge battery has left 4) Unit waits for “event” signal from xxxxxxx, of sufficient strength to initiate emitter (piezo element) 5) Once emitter is going, it continues for 90 seconds. a) I would like at least 105 - 135 dB at 24 inches. More is preferable. b) The audio signal should be startling, unique and attention grabbing. Open to discussion on this. 6) After the 90 seconds of high volume sound is done, for next 60 minutes the unit beeps once every 30 seconds. 7) Push the micro-button, or re-unit with magnet, to make the circuit dormant again.