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I am working on a professional such product with multiple sensors for multiple solar strings. I can give you some tips without giving away the farm.
First, I'm assuming for cost purposes you are using an open loop sensor....as in:
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The circle above...
If you use the right PIC24 or PIC32 chip, you need USB OTG (On the Go) as this allows you to be a USB host. Then you use the microchip application libraries. They have a bluetooth stack and USB software. You also need to know the chip types inside the USB dongle.
Then, theoretically, it should...
For any kind of circuit like this, I'd stay away from discretes and just use a 50 cent PIC like a PIC12F629.
Using the timers you can have multiple PWM lines in operation. The only limitations is current draw. The chip itself only allows a max of 25mA per pin with a max of 125mA for the chip...
These can be found just about anywhere. All you need is to have a separate line for each LED. Have a resistor in series with the LED. The max current you can drive directly from a PIC is 25mA and the max TOTAL is 125mA. If you want to exceed these limits, you need to use a drive transistor...
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