The 30A Relay HAT is a dual SPDT power relay I/O board based on the Microchip MCP23008 I2C expander. Ideally suited to automation or industrial control, switching of household appliances, industrial machinery or automotive applications.
- 2 opto-isolated SPDT power relays with indicator LEDs
- 30A @ 277V AC *
- Supports up to 6mm2 / 10 AWG cable
- 2oz copper PCB ensures maximum current flow
- Easy to use interactive web GUI
- Based on the MCP23008 8-port GPIO expander
- Jumper selectable I2C address & GPIO voltage (3.3V / 5V)
- Can be used with 3.3V or 5V I2C host devices (eg, Arduino)
- Built-in user programmable ID EEPROM
- Conforms to Raspberry Pi HAT Specifications
Once installed on your Raspberry Pi, this interactive GUI allows quick & easy control of your 30A Relay HAT without the need for any coding. It is designed to be both a user guide & quick reference to the 30A Relay HAT pinout. The GUI is fully responsive and adapts to any screen size.
Check-out the Live Demo.
Our easy installer takes care of the setup process automatically.
sudo wget https://git.plasmadan.com/install.sh
sudo sh install.sh
This script will automatically enable I2C, install the required packages and setup the Web GUI.
Alternatively, you can install manually. See our setup guide.
Featuring the well-documented MCP23008 8 channel GPIO expander, 30A Relay HAT is easy to setup and control via I2C. Channels 0-1 are utilised for the relays, giving you an extra 6 GPIOs for use with your project.
We built 30A Relay HAT to work with any device featuring an I2C bus. It can be used with either 3.3V devices (eg, Raspberry Pi) or 5V devices (eg, Arduino); by selecting the appropriate jumper (see device compatibility).
- 30A @ 277V AC *
Exceeding these limits may overload the PCB.
* 30A is no small fry! You must take into account the type of load you're switching. Study the relay datasheet! In open air 30A Relay HAT can safely handle 30A (resistive load) but beware of heat build-up with prolonged use.
DC is much more difficult to switch compared to AC. 30A Relay HAT is not rated to switch DC since it uses AC relays, however provided you stick to low voltages and keep the current reasonable, you should be fine. However this is entirely at your own risk and will likely reduce the operational life of the relays. Automotive applications at 12V DC should be fine also. We recommend a maximum 20A @ 30V DC.
Alternatively try our CTRL HAT boards which work with DC power-MOSFETs.
Mains voltage electricity is extremely dangerous. There is significant risk of death through electrocution, fire or explosion if not wired and fused correctly.
If using with mains voltages 30A Relay HAT must be installed in an electrically insulated enclosure by a qualified electrician and maintain at-least a 2mm air gap between all conductive parts of the Raspberry Pi (source).
Removing the LINK jumper from 30A Relay HAT will disconnect 5V power to the relays. This allows you to power the relays from a dedicated supply if required.
Using a decent power supply, such as the official Raspberry Pi adaptor, you can expect to pull around 1.5A from the 5V pins on a Raspberry Pi. You can use up to 8 30A Relay HATs with a single Raspberry Pi. That's up to 16 1W relays, 16 LEDs and 8 GPIO expanders which all need power. It's easy to see how quickly we can go over the limit, especially if the GPIO expanders are used to drive other devices. Back-powering can solve this.
The easiest way to back-power 30A Relay HAT is using the 5V power pins. Alternatively, solder directly to the supplementary power-in pads.
* Note: Back-powering is for 30A Relay HAT, not for Raspberry Pi. Remove the LINK jumper when back-powering to avoid damaging your Pi.
| Address | A2 | A1 | A0 |
|---|---|---|---|
| 0x20 | |||
| 0x21 | ⬛ | ||
| 0x22 | ⬛ | ||
| 0x23 | ⬛ | ⬛ | |
| 0x24 | ⬛ | ||
| 0x25 | ⬛ | ⬛ | |
| 0x26 | ⬛ | ⬛ | |
| 0x27 | ⬛ | ⬛ | ⬛ |
30A Relay HAT is fully compatible with all 40-way Raspberry Pi models and clones.
| Device Model | Compatibility |
|---|---|
| Raspberry Pi 1 Model A+/B/B+ | ✔️ |
| Raspberry Pi 2 Model B | ✔️ |
| Raspberry Pi 3 Model B+ | ✔️ |
| Raspberry Pi 4 | ✔️ |
| Raspberry Pi Zero | ✔️ |
| Asus Tinker Board | ✔️ |
| Orange Pi | ✔️ |
| Odroid | ✔️ |
| ATMegaZero | ✔️ |
To use with Arduino or any other 5V device the 3V3 jumper must be moved to 5V. Use the SDA & SDL breakout pins for I2C communication.
- The Pi Hut Modular RPi 2/3 Case
- The Pi Hut Modular Raspberry Pi 4 Case
- The Pi Hut Cluster HAT Case v3.0
- Multicomp Raspberry Pi HAT Case
Integrating 30A Relay HAT with your own projects is easy, just follow any guide which uses the MCP23008 or MCP23017 expander. We have provided some example Python scripts to get you started (see here).
MPN: 30A-RELAY-HAT
EAN: 0616908588429
MIT © Dan Jones - PlasmaDan.com