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output pins for relays

Started by Adbrig4, January 05, 2023, 08:08:20 AM

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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.
Daniel Kulp - https://kulplights.com

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
Long time Falcon, FPP and xLights user

tbone321

Quote from: JonB256 on January 07, 2023, 10:34:52 AMThe 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.  

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