ow-Cost Bluetooth External Sensor Prototype

I’m looking for someone to build a low-cost prototype external sensor unit for my GrowlerZ iOvilus project. The idea is a small Bluetooth sensor hub that connects to an Android phone/app and sends live readings from external sensors... (Budget: £20 - £250 GBP, Jobs: 3D Printing, Android, Bluetooth, Bluetooth Low Energy (BLE), Circuit Design, Documentation, Electronics, Microcontroller, Product Development, Prototyping)