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Arduino I2C Port Expander Shield

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Published on Jan 4, 2010

The I2C port expander shield adds 16 digital outs to the arduino. Using the I2C bus means you save 14 pins. Each pin is capable of sinking 20ma of current. No PWM support only on/off. I'm using it to turn SSR's on and off for the aquarium. Full details can be found here: http://www.diy-labs.com/node/55

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