free scale runnig

Using Arduino Project Guidance
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hi ,i would like ,to reduce the resolution of analogread of arduino mega at 8 bit
for ,this ,I learn that i can use the free scale runnig
can i have advices
thanks

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I learn that i can use the free scale runnig

I have absolutely no idea of what this means... but to make an 8 bit value from a 10 bit value, just divide by four or better yet, shift the 10 bit value 2 places to the right. See this reference:

https://www.arduino.cc/en/reference/bitshift

If you meant "prescale" as in the adc clock prescaler setting - that will not change the resolution, only the time it takes to do an a/d conversion.

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