Smart Phone Case Electronics Design & Prototyping
Budget: $30 – $250 USD
I’ve completed the physical shell for a phone case with a built-in drawer. I now need a freelancer to design and prototype the **electronics + firmware** that detects drawer activity and reliably sends events to the phone/app which I have already developed.
(what I need built):
* Recommend the best sensing approach to detect **drawer open/close** (magnetic reed/Hall, microswitch, optical, etc.) and design around the case constraints.
* Select components and create a complete electronics design:
* **Low-power microcontroller + BLE** (or comparable phone connectivity)
* Sensor(s) for drawer state
* Battery + charging solution (or wired power if strongly recommended)
* LED indicator (subtle, optional but preferred)
* Provide:
* Schematic, BOM, and PCB layout (compact, manufacturable)
* Firmware that broadcasts drawer events to the phone (BLE event + timestamp)
* Basic power optimization (sleep modes, battery life plan)
* Assembly guidance + wiring/placement instructions to fit the existing case shell
* Prototype support: help validate that the hardware works reliably inside the case (debounce, false trigger prevention, signal stability).
Key requirements:
* Drawer event detection must be **accurate and repeatable** (no false opens in a pocket/bag).
* Must fit within a tight form factor and not interfere with drawer motion or phone use.
* Battery life should be practical for daily use (low-power design is important).
* Deliverables must be clear enough for me to hand off to manufacturing later.
Nice to have:
* Experience with wearable/IoT hardware, BLE peripherals, and ultra-low-power design.
* Suggestions for DFM and scalable manufacturing.
(what I need built):
* Recommend the best sensing approach to detect **drawer open/close** (magnetic reed/Hall, microswitch, optical, etc.) and design around the case constraints.
* Select components and create a complete electronics design:
* **Low-power microcontroller + BLE** (or comparable phone connectivity)
* Sensor(s) for drawer state
* Battery + charging solution (or wired power if strongly recommended)
* LED indicator (subtle, optional but preferred)
* Provide:
* Schematic, BOM, and PCB layout (compact, manufacturable)
* Firmware that broadcasts drawer events to the phone (BLE event + timestamp)
* Basic power optimization (sleep modes, battery life plan)
* Assembly guidance + wiring/placement instructions to fit the existing case shell
* Prototype support: help validate that the hardware works reliably inside the case (debounce, false trigger prevention, signal stability).
Key requirements:
* Drawer event detection must be **accurate and repeatable** (no false opens in a pocket/bag).
* Must fit within a tight form factor and not interfere with drawer motion or phone use.
* Battery life should be practical for daily use (low-power design is important).
* Deliverables must be clear enough for me to hand off to manufacturing later.
Nice to have:
* Experience with wearable/IoT hardware, BLE peripherals, and ultra-low-power design.
* Suggestions for DFM and scalable manufacturing.