Creating a voltmeter with the Arduino

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can point me in correct dirrection. how can create voltmeter audrino duemilanove? plan on using audrino monitor several batteries. thank you.

an arduion analog input pin may have value of 0 +5 volts dc connected directly it. measure higher dc voltage external voltage divider must used.

easy method use 3 terminal 10 turn trimmer pot voltage divider, 5k ohm work ok. ground 1 of fixed pot pins, wire external battery voltage other pot fixed pin. adjust pot until varible pot pin measures 4 volts charged battery. can safely wire variable pin 1 of arduino analog input pins.

whats left software scaling of 10 bit digital value have know value equal external voltage value.

lefty


Arduino Forum > Forum 2005-2010 (read only) > Software > Interfacing > Creating  a voltmeter with the Arduino


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