output pins for relays

[Adbrig4]

Hello, Is there any digital output pins on the K8-B to connect relays to. that can be controlled in the FPP software?

[dkulp]

Yes.  Up in the corner between the expansion header and the RJ45 differential ports there is a small 2x4 pin header with 4 GPIO pins that can be used, 3.3V, GND, and the I2C bus pins.

[Adbrig4]

Ok, Great looks like they board must be able to source 3.3 volts and not 5volts probably be best to use a mosfet circuit to control power to a 5 volt relay. Do you happen to know max MA that would be safe on these Pins? 

Thanks.

[tbone321]

Why don't you just buy a relay board.  You can get them in 1, 2, 4, 8, and even 16 relay configurations.  They have optical isolation to protect your SBC and run from a separate power source.  Current draw from your SBC is just about none because just about all of the boards circuitry is powered from that separate supply, including the relay coils.  I just picked up 2 5V 4 relay boards from Amazon for $10.  

[JonB256]

The ICStation board (4 relays) is specifically supported by FPP as an "Other" output, "USB Relay"

Because it connects to the USB port on a Pi or BBB, it gets its power there. (don't use a skimpy power supply for the FPP, though). 

For $6.99, it eliminates a lot of hassle.
https://www.icstation.com/icstation-micro-channel-relay-module-control-relay-module-icse012a-p-4012.html

If you're into ESP286 wireless items, they sell a 4 relay wireless board, too.
https://www.icstation.com/esp8266-wifi-channel-relay-module-remote-control-switch-wireless-transmitter-smart-home-p-13420.html

[tbone321]

The ICStation board (4 relays) is specifically supported by FPP as an "Other" output, "USB Relay"

Because it connects to the USB port on a Pi or BBB, it gets its power there. (don't use a skimpy power supply for the FPP, though). 

That board is pretty cool and can really help out of you want to use the Pi to control relays and are also using a Pi Cap on it as well.  I may look into picking up the 8 relay version for my Halloween display and may also look into picking up one for a few of my LED props that run on transformers and cannot be dimmed.