MakerFocus Raspberry Pi Expansion Board 4 Channel Relay Board Module Power Relay Module for Raspberry Pi 4B3 Model BRaspberry Pi 32 Model B No Programming RequiredProgrammable

Product Decription: 4 Channel Relay Hat Board For Raspberry Pi is one of the "docker pi" module. It has a 4-channel relay, it is the best choice for smart home projects. This four-channel relay uses high-quality relay modules combined with the most popular microcontroller technology to communicate with the Raspberry Pi. You can use multiple modules stacked together for use. You can stack up to four layers. Switch the I2C address of the device through the DIP switch on the circuit board to ensure that the four-layer module gets different addresses, thus avoiding the problem of address duplication. The module is very fast, easy to install, and supports multi-language development, making it ideal for smart home projects. NOTE: The 4pin pin is a backup that supplies power to future products. You can ignore those pins. Please do not connect any device to that pins. Product Features Easy to install, Programmable Control directly(without programming) Extend the GPIO Pins 4 channel relay 4 Alt I2C Addr Support Can Stack with other Stack board Support multi-language programming Support 3A 250V AC Support 3A 30V DC Support address switching by dial switch Support relay status light prompt Independent of the mainboard hardware (require I2C support) Compatible with 24AWG-30AWG wire Product Advantage: Independent of the programming language, it only need I2C protocol support You could use the command control directily instead of programming Use the raspberry pi to replace the trandition switch Compatiable with multiple protection board Package Including: 1 * Channel Relay Hat Board 4 * M2.5x11+6 copper stick 8 * M2.5x5 screws & nuts 1 * Instructions