Swapping between words

[thedarkshade]

Hi everyone

 

I've had this project on controlling the light intensity with a microcontroller, using phase control. I've build the zero-cross detector and the circuitry to interface with the light via an optocoupler (MOC3023) and a triac (BT138), but I'm a little stuck on the software. I'm using an on-board potentiometer to control the intensity and a 12bit ADC to get the digital value, but I think I can easily complete by having an 8bit value.

So my point of concern is how do I change this 12bit value into an 8bit one?

Any help at all would be greatly appreciated

 

TDS

[ewmon]

There isn't any conversion. Use the ADC's 8 MSBs.