GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable)

• The 4-channel relay cap board for Raspberry Pi is part of the "docker pi" module. It has a 4-channel relay that you can add to your smart home project.Can be accessed programmatically or directly by shell. It also uses high-quality relay modules combined with the most common microcontroller technology to communicate with the Raspberry Pi.
• Can be accessed programmatically or directly by shell.Switch the I2C address of the device using the DIP switch located on the PCB to ensure that the four-layer module gets different addresses, thus avoiding the problem of address duplication.
• The relay module is very fast, easy to install and supports multilingual development, making it ideal for smart home projects. It supports multiple modules stacked for use.
• WIKI: https://wiki.52pi.com/index.php/4_Channel_Relay_Hat_Board_For_Raspberry_Pi_SKU:_EP-0099
• Package includes: 1 x 4-channel relay cap panel, 4 x M2.5 x 16 copper stick, 8 x M2.5 x 12 screws, 1 x instructions

Description 4 Channel Relay Hat Board For Raspberry Pi is one of the "docker pi" module.It has 4 channel relay that you can put it on your smart home project. 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, even 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. PS: 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. Package includes: 1 x 4 channel relay hat board. 4 x M2.5x16 copper sticks. 8 x M2.5 x 12 screws. 1 x instructions.