Feature
If you just don’t have enough digital I/O pins on your for Arduino to interface with all your sensors and controls, you might want to look at using the I2C bus to connect a few port expander chip PCA8574AD have 8 digital I/O bits and can be set to addresses 0x38-0x3F respectively.
The I2C bus on the for Arduino uses SCL, SDA, a couple of pull up resistors and the Wire library.
You can connect more expander module. More 8 modules. Just change the address of each module.
On the backside of the board have instruction.
If you need more connecting modules, pls cut off the connection of pull-up resistor on the back side of board.
Only 1 board needs a pull-up resistor.
Package includes
20x Expansion Board
Additional information
| Weight | 0.36 kg |
|---|
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