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PCF8574 8-channel I/O expander module A PCF8574-based 8-channel I/O expander module, as described in the November 2019 issue. Controlled via I2C. Cat No SC5226. Price: AUD $3.00 1  Add to trolley (available until stock is exhausted) In stock: yes (8 available). Estimated dispatch time: 1-3 days Related to: Feature: Three I-O Expanders to give you more control! (November 2019 [print issue] [online issue]) Other items relevant to this project: PCA9685 16-channel 12-bit PWM module ($6.00) Add to trolley MCP23017 16-channel I/O expander module ($3.00) Add to trolley Sample code for Three I/O Expander Modules (Free) Add to trolley