What is the cheapest solution for a Project with bluetooth(ble) and light sensor

Hi,

I am planning on making an arduino setup with bluetooth and light sensor. I want to program the arduino to communicate the light sensor data with my laptop via bluetooth. The arduino should be battery powered.

So what I need is:

  • A simple arduino board
  • light sensor
  • bluetooth module/shield(ideally bluetooth low energy to save battery)
  • battery

What is the cheapest hardware combination with which it’s possible to achieve this?

The 3.3v Mini Pro is about $5. The 5v version costs half that but I imagine the 3.3v would be better for battery operation and the bluetooth module is also 3.3v

Greensprings:
just dont do it at all

Why? Please, explain your answer. Tell us the motivations behind this, and the pros and cons of the project of ObiTewodros