Welcome to EnviroDIY, a community for do-it-yourself environmental science and monitoring. EnviroDIY is part of WikiWatershed, a web toolkit designed to help citizens, conservation practitioners, municipal decision-makers, researchers, educators, and students advance knowledge and stewardship of fresh water. New to EnviroDIY? Start here

Reply To: Mayfly v1.1 technical questions forum thread

Home Forums Mayfly Data Logger Mayfly v1.1 technical questions forum thread Reply To: Mayfly v1.1 technical questions forum thread

#17873
neilh20
Participant

    There is some onchip references, but maybe not useful. From the manual mega164A_PA-324A_PA-644A_PA-1284_P_Data-Sheet-40002070B.pdf   (applies to the mega1284)

    Chp 23.2: “<span class=”fontstyle0″>Internal reference voltages of nominally 1.1V, 2.56V, or AV</span><span class=”fontstyle0″>CC </span><span class=”fontstyle0″>are provided On-chip. The voltage reference may be externally decoupled at the AREF pin by a capacitor for better noise performance. </span> ”

    However the benefit of the 3.3V is that its +-1% – whereas the 1.1V and 2.56 are +/- ~10%