unstable analogue input from PCF8591 - Raspberry Pi Forums

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hi,
have few question project, read few analogue input raspberry pi. have followed tutorial read analogue , wiring thats post http://blog.jacobean.net/?p=258.
@ first didn't wire ain1, ain2 , ain3 gnd(because forgot it) have unstable analogue read, when tried wire gnd have constant analogue read (like 128 , 0) , wont changed when twist pot. can me? i'm newbie on reading adc peripheral this, thanks



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