Review on 🧊 Comimark PCF8574 PCF8574T: I2C 8 Bit IO GPIO Expander Module for Arduino & Raspberry Pi (3Pcs) by Bill Snyder

Name: 🧊 Comimark PCF8574 PCF8574T: I2C 8 Bit IO GPIO Expander Module for Arduino & Raspberry Pi (3Pcs)
Item: 🧊 Comimark PCF8574 PCF8574T: I2C 8 Bit IO GPIO Expander Module for Arduino & Raspberry Pi (3Pcs)
Rating: 5

November 13, 2022

Works well! for computers and accessories

These extenders work great once you figure out the address. On the Arduino, the default address is 0x20, not 0x40 as some datasheets state. This is because in the datasheet the R/W bit is considered the first bit and the Arduino ignores this bit, so the address is divisible by 2. So if you change the jumper from A0 to VCC, the address in the Arduino will be 0x21, not 0x42 like in datasheets.

Pros

computers and accessories

Cons

weak

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