--- product_id: 236259467 title: "GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable)" brand: "geeekpi" price: "£22.61" currency: GBP in_stock: false reviews_count: 7 url: https://www.desertcart.co.uk/products/236259467-geeekpi-expansion-board-4-channel-relay-module-for-raspberry-pi store_origin: GB region: United Kingdom --- # Supports up to 250V relay rating 4-channel relay control Stackable multi-layer design GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable) **Brand:** geeekpi **Price:** £22.61 **Availability:** ❌ Out of Stock ## Summary > ⚡ Power your smart home projects with precision and ease! ## Quick Answers - **What is this?** GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable) by geeekpi - **How much does it cost?** £22.61 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/236259467-geeekpi-expansion-board-4-channel-relay-module-for-raspberry-pi) ## Best For - geeekpi enthusiasts ## Why This Product - Trusted geeekpi brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Robust & Fast Response:** High-speed relay switching combined with reliable microcontroller tech ensures smooth operation. - • **Seamless 4-Channel Control:** Easily manage multiple devices with four high-quality relays designed for smart home automation. - • **Customizable I2C Addressing:** Avoid address conflicts effortlessly using DIP switches for multi-module stacking. - • **Plug & Play with Raspberry Pi:** No programming required—quick setup with shell access or full programmability for pros. - • **Multilingual Development Support:** Compatible with multiple programming languages to fit your coding style and project needs. ## Overview The GeeekPi 4 Channel Relay Module is a versatile expansion board for Raspberry Pi models 2, 3, 3 B+, and 4 B, enabling control of up to four devices via high-quality relays. It supports both direct shell access and programmable interfaces, features DIP switch-configurable I2C addresses to prevent conflicts when stacking multiple modules, and is designed for fast, easy installation. Ideal for smart home automation enthusiasts seeking reliable, scalable relay control without complex setup. ## Description 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. Review: Works as expected, thanks - Works as expected, thanks Review: Easy to configure and use - As others have mentioned, the silk screen printing for the relay connections is wrong. Normally open (N/O) is actually normally closed (N/C) and vice versa. Check the connections for yourself with a meter. The board is very easy to use, just follow the instructions. You do need some knowledge of programming a Raspberry Pi, but everything needed can be found on the internet. While there is a rating of 250 Volts for the relay contacts, the board is not safe for use with mains Voltages. Just be realistic and switch low Voltages, such as 12 Volts. It would have been a 5* review if the screen printing had been corrected. ## Features - 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07Q2P9D7K | | Are Batteries Included | No | | Best Sellers Rank | 134,879 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 536 in Barebone PCs | | Brand | GeeekPi | | Customer Reviews | 4.5 4.5 out of 5 stars (96) | | Date First Available | 16 Jan. 2019 | | Form Factor | Stick | | Guaranteed software updates until | unknown | | Item Weight | 59 g | | Manufacturer | GeeekPi | | Manufacturer reference | EP-0099 | | Memory Technology | LPDDR2, LPDDR4 | | Operating System | Raspberry Pi OS (ehemals Raspbian) | | Package Dimensions | 10.69 x 8.1 x 3.1 cm; 59 g | | Processor Brand | ARM | | Processor Count | 1 | | Series | Raspberry Pi 4 Model B | | Wireless Type | Infrared | ## Product Details - **Brand:** GeeekPi - **Connectivity technology:** I2C, Infrared - **Included components:** 1x 4 Channel Relay Hat Board, 4x M2.5x16 copper stick, 8x M2.5x12 screws, 1x Instructions - **Model name:** Raspberry Pi 4 Model B - **Operating system:** Raspberry Pi OS (ehemals Raspbian) ## Images ![GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable) - Image 1](https://m.media-amazon.com/images/I/61PLbOdR3fL.jpg) ![GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable) - Image 2](https://m.media-amazon.com/images/I/61dkc1seTpL.jpg) ![GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable) - Image 3](https://m.media-amazon.com/images/I/71-lJqsDlKL.jpg) ![GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable) - Image 4](https://m.media-amazon.com/images/I/7186SOyZ6TL.jpg) ![GeeekPi Expansion Board 4 Channel Relay Module for Raspberry Pi 3/2 B, 3 Model B+ & 4 Model B (No Programming Required/Programmable) - Image 5](https://m.media-amazon.com/images/I/71JhaGug-FL.jpg) ## Questions & Answers **Q: Is a 3A relay enough for home heatpump and airconditioning?** A: Not if u use it to switch the compressor. yes if its just for the thermostat **Q: Is it possible to connect an i2c (si7021 temp/humidity sensor) to the i2c pins 3 and 5 when using this hat?** A: As this board can be stacked, it has male pins on top, so you definitely physically can connect something to the pins. I guess you'll only need to take care of the I2C address you use to not interfere with the ones of the relay board(s) **Q: Does this board have optocouplers to prevent high voltage interference?** A: Dont think so. I wouldn't use it for high voltage anyway. See my review **Q: Can i use gpio pins for inputs and use the relay board too?** A: Yes you can. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works as expected, thanks *by I***N on 26 September 2022* Works as expected, thanks ### ⭐⭐⭐⭐ Easy to configure and use *by M***D on 5 July 2024* As others have mentioned, the silk screen printing for the relay connections is wrong. Normally open (N/O) is actually normally closed (N/C) and vice versa. Check the connections for yourself with a meter. The board is very easy to use, just follow the instructions. You do need some knowledge of programming a Raspberry Pi, but everything needed can be found on the internet. While there is a rating of 250 Volts for the relay contacts, the board is not safe for use with mains Voltages. Just be realistic and switch low Voltages, such as 12 Volts. It would have been a 5* review if the screen printing had been corrected. ### ⭐⭐⭐⭐⭐ Review *by D***A on 2 October 2025* Carte très propre et bien fabriquée ! Il y a même une vis/écrou/colonnette supplémentaire. Pour pouvoir accéder au bus i2c (ici sous dietpi/linux avec utilisateur par défaut : dietpi) IL FAUT : Ajouter l'utilisateur au groupe i2c : sudo usermod -a -G i2c dietpi Vérifier avec ls -l /dev/i2c* que cela donne crw-rw---- 1 root i2c 89, 1 2 oct. 16:37 /dev/i2c-1 Propriétaire root et groupe i2c Pour avoir accès aux commandes i2c... depuis un utilisateur non root ici "dietpi" il faut rajouter l'accès à /usr/sbin en ajoutant la ligne : # rajout accès aux commande i2c dans /usr/sbin export PATH=$PATH:/usr/sbin dans le fichier /home/"utilisateur"/.bashrc avec éditeur nano par exemple. Sauvegarder puis lancer la commande source .bashrc Maintenant vous pouvez taper les commandes sur le site du fabricant du style "i2cset -y 1 0x10 0x01 0xFF" En espérant que cela vous aura éclairé... J'ai réalisé un script shell pour rendre la chose plus simple. Je vous le propose : #!/usr/bin/env dash ## installer paquet i2c-tools ## script cog_relay -> commandes 4 relais i2c RPi ## -> chmod +x cog_relay ## ./cog_relay carte: 1/2/3/4 relais: 1/2/3/4 status: on/off ## (c)dja licence domaine public/CC0 on='0xFF' off='0x00' ## 3 paramètres transmis... ## adresse carte i2c en $1 if [ -z "$1" ]; then echo "carte 1/2/3/4 ?" exit 1 else card="$1" fi ## numéro relais en $2 if [ -z "$2" ]; then echo "relais 1/2/3/4 ?" exit 1 else numrelay="$2" fi ## état on/off en $3 if [ -z "$3" ]; then echo "status on/off ?" exit 1 else status="$3" fi ## numéro de carte @i2c case "$1" in 1) card="0x10" ;; 2) card="0x11" ;; 3) card="0x12" ;; 4) card="0x13" ;; *) echo "carte 1/2/3/4 ?"; exit 1 ;; esac ## numéro de relais 1/2/3/4 case "$2" in 1) numrelay="0x01" ;; 2) numrelay="0x02" ;; 3) numrelay="0x03" ;; 4) numrelay="0x04" ;; *) echo "relais 1/2/3/4 ?"; exit 1 ;; esac ## status on/off case "$3" in on) status="0xFF" ;; off) status="0x00" ;; *) echo "status on/off ?"; exit 1 ;; esac ## commande du relais ## @bus_i2c @carte_i2c relais $status ## ex: i2cset -y 1 2 on (relais 2 on sur carte 1 -> on) i2cset -y 1 "$card" "$numrelay" "$status" exit 0 Cordialement ## Frequently Bought Together - GeeekPi 4 Channel Relay Board Module for Raspberry Pi, Power Relay Module for Raspberry Pi 4B & Raspberry Pi 3 Model B+ & Raspberry Pi 3/2 Model B (No Programming Required/Programmable) - HCDC RPi GPIO Status LED & Terminal Block Breakout Board HAT for Raspberry Pi A+ 3A+ B+ 2B 3B 3B+ 4B - Raspberry Pi 4 Model B 2019 Quad Core 64 Bit WiFi Bluetooth (4GB) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/236259467-geeekpi-expansion-board-4-channel-relay-module-for-raspberry-pi](https://www.desertcart.co.uk/products/236259467-geeekpi-expansion-board-4-channel-relay-module-for-raspberry-pi) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-15*