PCF8574 I2C Digital IO Expansion Module

The PCF8574 is an 8-bit I/O expander that allows for 8 digital inputs or outputs per device. It operates within a voltage range of 2.5V to 6V, making it compatible with both Arduino (5V) and ESP32 (3.3V) systems.

This IC communicates with the microcontroller via the I2C bus, which requires two pins: SDA (data) and SCL (clock). On the ESP32, SDA is on Pin 21 and SCL is on Pin 22. For the Arduino Uno R3, SDA is on Pin A4 and SCL is on Pin A5, or you can use the dedicated I2C ports located on the left side of the board.

You can connect up to 8 PCF8574 ICs to the same I2C bus, providing an additional 64 GPIOs per bus. Each PCF8574 must have a unique address, which can be set using the three jumpers on the board. Typically, the addresses range from 0x20 to 0x27.

 

Documents

• PCF8574 Datasheet

What’s in the Box

There are 3 pieces in the retail box.
The listing price is for

• 1 x PCF8574 I2C Digital IO Expansion Module

FREE SHIPPING

• Australia Orders over $55 - Your order will enjoy free shipping via Australia Post Standard Shipping Services. 
• International Orders over $99 - Your order will be posted via Australia Post Air Mail Services. 

Raspberry Pi board / Micro:bit board / NVIDIA board will be excluded; All PCB orders will not enjoy free shipping. Distributors and wholesale orders are not eligible for free shipping.

 

PICK UP
At this time, LONELY BINARY is an online-only business, with our products available through lonelybinary.com. This allows us to keep the cost down for the customer. Orders cannot be picked up. 

 

AUSTRALIAN ORDERS
We ship Australia wide to all addresses, including PO Box, Parcel Locker, etc.All Australian orders will be shipped via Australia Post, Courier Please or Fastway Couriers (Aramex). International Orders will be shipped via Australia Post or DHL. Your order will be shipped within one business day after we receive payment, providing the items are in stock.

• Standard Shipping
  Sent via standard Australia Post stamped letter mail, typically 5-9 business days. No tracking/support available other than confirmation of dispatch.
• Express Post
  Sent via Australia Post Express Service, Fastway Courier or Courier Please, 1 – 2 business days for metro orders, potentially longer for orders outside of metro zones, with full tracking.

Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.

INTERNATIONAL ORDERS
Shipping costs for international orders vary depending on location and package size, where possible we have kept this to flat rate charges to reduce confusion. International orders are shipped through Australia Post and DHL courier service depending on the most economical at the time. 

 

Shipping Method via	Delivery Area	Delivery Time(business day)	Tracking No.	Weight Limit
DHL	Asia	1-2	YES	No Limit
	western EU	2-3	YES	No Limit
	eastern EU	3-5	YES	No Limit
	North America	2-3	YES	No Limit
	Australia	2-3	YES	No Limit
	South America	3-5	YES	No Limit
	South Africa	3-5	YES	No Limit