Minor Quirks

I2C address must be set via solder jumpers. Use the options to the right if you want us to solder the default address for you. More info below.

Relay Boards (not-included)

The goal of the IOByte is to create a better breakout for the PCF8574 GPIO Extender mostly focused on quickly deploying relays and switch panels via i2c. The initial idea behind the PCB design was based on having it fit directly on a common 8-Channel relay board. Existing breakouts generally would require 10 DuPont leads (or other wire interface) to the relay board. Solder on a 10p female header, connect I2C and you have a super fast and cheap deployment.

Switch Panels (not-included)

The IOByte can also act as a binary input device. The ground row of pins makes it easy to deploy simple switches connected from and of the 8 open-drain pins to ground. Quickly deploy switch panels with your favorite hardware.

What's Included

For each IOByte you order, you get the following:

• IOByte PCB
• 1x4p Right-Angle Pin Header (2 Pcs)
• 1x9p Pin Header
• 1x10p Pin Header
• 1x10p Socket Header
• Reusable Bag with Cheatsheet Label

Production Quirks

Previous versions were tested with PCF8574 chips from TI, which don't seem to care if they start-up with the address pins floating. This run was assembled with chips from HGSEMI via JLCPCB and further tested with XINLUDA chips which are also angsty about floating address pins.

Current version is v1.2 and future versions will correct this mistake, but manual intervention and awareness is the best way to manage the current batch. As mentioned at the top, let us know if you'd like us to set the default address via the solder jumpers