Spannungsmessung möglichst genau

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hallo.

aktuell würde ich gerne mittels einem arduino eine spannung messen. der bereich ist etwa von 4 - 6v. allerdings bräuchte ich 1mv genauigkeit.

was meint ihr? ist der beste lösungsweg?

mfg

ein externer chip, weil der arduino das nicht kann. 6v mit 1mv = 6000 messauflösung, arduino hat 1024. du brauchst einen 13 bit messwandler, wenns das gibt. meistens sind es 14 oder 16bit auflösung.

und einen ziemlich sauberen aufbau, weil bei 1mv bewirken schon 20cm draht in der nähe einer funkquelle mit 1-2mv fehler. muss mit passender belastung und abgeschirmt aufgebaut werden.



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