There are plenty of multi-relay boards for Raspberry Pi, but since those are often combined with an HMI for control, SB Components decided to offer an all-in-one solution with an expansion board equipped with eight relays and a 4.3-inch touchscreen display connected to a Raspberry Pi via HDMI and USB.
PiRelay 8 specifications:
- 8x relays with 3.3V/5V trigger signal
- Input – 250V AC/7A, 30V DC/10A
- Screw terminal blocks
- NO (Normally Open) and NC (Normally Closed) modes available
- Isolation – EL357NC optocouplers with current transfer ratio (CTR) of 50-600% at IF=5mA, VCE=5V
- Display support – Optional 4.3-inch touchscreen display with 800 x 480 pixels resolution, HDMI input for video, USB for touchscreen support. It also comes with a 3.5mm audio jack, an HDMI audio output, a speaker connector, and mounting holes for the Raspberry Pi.
- 40-pin GPIO header to connect a Raspberry Pi SBC (Pi 4, Pi 3B+, Pi 3, Pi 2, or Pi Zero), or other compatible boards
- Misc – Relay status LEDs, power LED
- Power Supply – 5V DC /2A via USB or terminal block
The company says the PiRelay 8 expansion board is open-source, with an Android app to control the relays as well as Python examples. But I could not find any resources specific to the new board, only a Github repository for the earlier PiRelay-V2 from the company.
The opto-isolated relay board for Raspberry Pi has just launched on Kickstarter. Rewards start at $35 for PiRelay 8 without the display, but most people may want to pledge $104 for a pack with the relay board plus the 4.3-inch touchscreen display. They also offer complete bundles with a Raspberry Pi 4. Shipping adds 7 GBP to the UK, about 16 Euros to European countries, and $35 to the rest of the world. SB Components expect shipping to start in September 2021.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.