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Opto-isolated relay add-on for Raspberry Pi has optional 4.3-inch touchscreen

Jul 1, 2021 — by Eric Brown 760 views

[Updated: July 2] — SB Components’ $28-and-up “PiRelay 8” add-on for the Raspberry Pi supplies 8x relays with photo-coupling isolation for controlling devices on a load of 250V AC/7A or 30V DC/10A. There is also an optional 4.3-inch HDMI touchscreen.

SB Components has launched a PiRelay 8 add-on board for the Raspberry Pi with 8x relays. The board can optionally be topped by a 4.3-inch IPS touchscreen and offers photo-coupling isolation between the relays and a 5V/2A micro-USB port for powering the add-on and the Raspberry Pi.

PiRelay 8, front and back (left) and with optional RPi 4 and HDMI touchscreen
(click images to enlarge)

The open-spec PiRelay 8 has already won funding on Kickstarter and there are still two days left to get in on the 20-Pound ($28) package before it increases to $35. There is also a 75-Pound ($104) package that adds the touchscreen and a $153 package that also adds a Raspberry Pi 4 Model B with 2GB RAM. Shipments are due in September.

The PiRelay 8 offers 8x relays that support the same number of devices with a load of 250V AC/7A or 30V DC/10A. There is also a trigger voltage of 3.3V with photo-coupling isolation, “allowing users to safely control high voltages or current devices” via the touchscreen, says SB Components.


The isolation is enabled with an Everlight EL357NC optocoupler. The PiRelay 8 is further equipped with a 40-pin GPIO header, relay control pins, and LEDs.

PiRelay 8 in action (left) and sample screen shot
(click images to enlarge)

The optional 4.3-inch, IPS touchscreen uses an HDMI connection and offers 800 x 480 resolution. The touchscreen, which can also be used independently with many other platforms, comes with a 3.5mm audio jack, an HDMI audio output, a speaker connector, and mounting holes. If you do not buy the touchscreen, you can add your own display via the Pi.

Further information

The PiRelay 8 is available on Kickstarter through July 31, starting at 20 UK Pounds ($28), with shipments due in September. Volume discounts are available. More information may be found on the SB Components’ PiRelay 8 product page.

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