16 Channel I2C Relay Module For Arduino & Raspberry Pi - 3.3V/5V With PCF8575 Chip

About This Product

Electronics hobbyists and makers, this 16-channel I2C relay module is seriously powerful for automation projects. The I2C interface is what makes this so clever - you can control up to 128 relays with just 4 wires by daisy-chaining multiple boards, which is way more efficient than using up all your GPIO pins. The board comes fully assembled and ready to go, which saves you the hassle of soldering all those components. It works with both 3.3V and 5V systems, making it compatible with Arduino, Raspberry Pi, and most other microcontrollers. Each relay can handle up to 10A depending on voltage, which is substantial for controlling lights, motors, or other higher-power devices. The LED indicators for each channel are super helpful for debugging - you can see at a glance which relays are active. The PCF8575 chip handles the I2C communication smoothly, and the DIP switches let you set unique addresses for each board from 0x20 to 0x27. The relay specs are impressive too - mechanical life of 10 million operations and electrical life of 100,000 operations at rated load means these aren't flimsy components that will burn out quickly. I've used this for home automation projects controlling lights and appliances, and the reliability has been solid. The board dimensions at 135x150mm give everything enough space without being overly large. If you're working with 3.3V systems like Raspberry Pi, you might want a logic level shifter for stable operation, but for 5V Arduino setups, it works perfectly out of the box. Whether you're building an elaborate home automation system, industrial control projects, or just experimenting with relay control, this 16-channel I2C module gives you serious expansion capabilities without complicating your wiring. It's one of those components that seems technical but actually simplifies complex control systems once you understand the I2C addressing.