groundFungus:
This topic has been discussed many many times on this forum. Do a search for "1023 or 1024" for lots of reading.
Cool! Thanks G.F.
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UPDATE: Ok..... back again. Looks like the general consensus is divide by 1024, not divide by 1023. So the voltage range covered is 0 V up to (5 - 5/1024) V. Level 1 is 0*(5/1024) = 0V........level 1024 is 1023*(5/1024) V. So '5V' itself is not covered .... but the next value below 5V which is relatively close to "5V" ..... is covered. Thanks again.