The pcf8574 is an 8 bits i/o port expander that uses the i2c protocol. If no value is provided, the port will be read. A blocks / javascript code editor for the micro:bit powered by microsoft makecode.
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For example, with a keypad attached to a pcf8574 and an i2c lcd screen, you can attach both to the micro:bit and only use pins 19 and 20. When all onboard switches are. Using this ic, you can use only the sda and scl pins of your arduino board to control up to 8 digital i/o ports.
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A blocks / javascript code editor for the micro:bit powered by microsoft makecode.
