Need help with voltage dividers
hi, i'm building project using arduino uno, have flex sensor gives variable resistance 9k? 30k?. best precision need have biggest range of voltage drop depending on sensor's resistance. i'm powering circuit arduino's 5v output, , want obtain biggest possible voltage drop when sensor @ 30k? , highest voltage when it's @ 9k?. it's easy potentiometer, instead of having variable resistance 0 x ? need use sensor. think need parallel resistor, best solution obtain widest range of voltage ?
try this: 5v sensor analog pin, 10k analog pin gnd.
sensor @ 9k, vout = 5 * 10000/(9000+10000) = 2.6v
sensor @ 30k, vout = 5 * 10000/(30000+10000) = 1.25v
stick in other values 10000, if want.
if go bigger, need allow more settling time adc give accurate readings.
if go smaller, resulting range gets smaller.
sensor @ 9k, vout = 5 * 10000/(9000+10000) = 2.6v
sensor @ 30k, vout = 5 * 10000/(30000+10000) = 1.25v
stick in other values 10000, if want.
if go bigger, need allow more settling time adc give accurate readings.
if go smaller, resulting range gets smaller.
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