This project is to create a wirelessly activated alarm device that is camouflaged as a AAA battery.
Brief:
Two pieces of hardware - an "alarm unit" and a "control unit".
Alarm unit description. It must:
• be precisely the size and shape of a AAA battery.
• behave exactly like a rechargable AAA battery
• supply at least 1.2 V to the outside world, through standard AAA battery contacts
• be able to be recharged via a standard AAA battery charger (charger type you may choose - NiMH, LiON, etc)
• be fully self-contained with all electronics
• contain a buzzer / speaker
• contain a wireless receiver and antenna
• Sound an alarm when a specified wireless transmission is received
• continue to sound until the transmission stops
• have battery life of at least 6 months when "listening". It is acceptable for the device to "sleep" and wake up at regular intervals (say, 10 seconds) to check for the transmission
• have very low manufacture cost
Control unit description. It must:
• contain transmission electronics to issue the wireless signal for the Alarm unit to sound
• have on the enclosure a toggle button to turn the wireless transmission on/off
• be easy to toggle
• be in an enclosure of reasonably small size, but this is not a tight restriction. I would probably use an off-the-shelf enclosure.
• have a user-replaceable battery (don't care what type)
• have very low manufacture cost
Project Milestones - all milestone apply to BOTH Control Unit and Alarm Unit
• Electronics Design
• PCB Layouts
• Enclosure designs
• Prototypes fabricated
• Firmware written
• Prototype testing
• Further system updates / changes
• Design & tooling for short manufacture run
• manufacture run (prob 100 units)
This would be an awsome project to work on. However the scope of work is huge for the expected budget.
A manufacturing run of enclosures and electronics for 100 sets is not going to come within the budget you've listed.