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Recent posts
#91
BeagleBone Black Controllers / Re: K8-Pi Cape Power
Last post by dkulp - May 21, 2023, 02:03:33 PMAs long as you REMOVE the "Power the Pi" jumper, then the power for the pixel connectors is completely separate from the power to the rest of the cape. The grounds are tied, but the V+ is completely separate. Thus, you can power the two up/down individually.
#92
BeagleBone Black Controllers / Re: How to connect a button (v...
Last post by k6ccc - May 21, 2023, 01:40:31 PMQuote from: pck on May 21, 2023, 01:30:30 PMFor me, its best to go with a driver transistor.Agree 100% with that low of current capability on the GPIO pins.
#93
BeagleBone Black Controllers / Re: How to connect a button (v...
Last post by pck - May 21, 2023, 01:30:30 PMI looked for the output specs for the GPIO pins and some say they are rated for 16ma with the default being 8ma. 180 ohms might be a little low for 16ma values. You could use a 220 ohm resistor for a 16ma output and that would only be if you changed from the default 8ma to 16 (i don't know how to do that). For the 8ma output you need a resistor of a little over 400 ohms. This probably would help your brightness much. For me, its best to go with a driver transistor.
#94
BeagleBone Black Controllers / Re: How to connect a button (v...
Last post by pck - May 21, 2023, 12:34:40 PMK6ccc makes a good point. A typical led draws around 20ma so you could lower the resistor value to 180 ohms.
#95
BeagleBone Black Controllers / Re: How to connect a button (v...
Last post by k6ccc - May 21, 2023, 12:23:21 PM3.3V will turn on an LED just fine, but very likely a much smaller resistor will be needed.
Personally I don't like having a CPU IO port directly driving a relay because of inductive spike upon de-key. There are ways to mitigate that if you really need to. However a transistor would do the job just as well - as pck also just said.
Personally I don't like having a CPU IO port directly driving a relay because of inductive spike upon de-key. There are ways to mitigate that if you really need to. However a transistor would do the job just as well - as pck also just said.
#96
BeagleBone Black Controllers / Re: How to connect a button (v...
Last post by pck - May 21, 2023, 12:19:07 PMI would use a common emitter driver circuit to drive the led directly. A 2n2222 transistor would work with the base fed from the GPIO pin thru a 1k resistor.
#97
BeagleBone Black Controllers / Re: How to connect a button (v...
Last post by pierlux - May 21, 2023, 11:57:56 AMI see. I've been looking into relays anyway as 3.3V barely turns on the LED.
Would this schema work better?
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Would this schema work better?
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#98
Designer Troubleshooting and Help / Re: Logic Shift a 12v Data Pi...
Last post by pck - May 21, 2023, 11:29:36 AMbrookedot
The fastest way to get help with your project would be to go to the Xlights Zoom Room. You can get there by going to xlights.org and clicking on the "Zoom Meeting" box on the top right. There are people there that can help you on the spot. The room usually has experts in Xlights, various controllers, FPP and all kinds of pixel types. Its the off season now and you can get help right away.
The fastest way to get help with your project would be to go to the Xlights Zoom Room. You can get there by going to xlights.org and clicking on the "Zoom Meeting" box on the top right. There are people there that can help you on the spot. The room usually has experts in Xlights, various controllers, FPP and all kinds of pixel types. Its the off season now and you can get help right away.
#99
BeagleBone Black Controllers / Re: K8-Pi Cape Power
Last post by k6ccc - May 21, 2023, 10:20:01 AMQuote from: VistaLeaf on May 21, 2023, 07:50:59 AMI'll be using this system year-round for permanent lights and I don't want the power supply running 24/7.
Can't help you on the separate power issue, but my standard question is why? The total power consumption is miniscule, and electronics generally fail at power up. Leave them running and in most cases, they will be happier. The exception to that may be if heat is going to be a problem during the day.
BTW, I have run year round landscape lighting since 2011 and currently have two LOR AC controllers, three LOR DC controllers, a Falcon F4v3, and a Falcon Smart Receiver board that run 24 x 7 x 365. The only thing that is not run during the off season is the dedicated show computer. From early January until mid October, the landscape lighting is controlled by my domain controller / file server since it will be running year round anyway. For Halloween & Christmas, I do have a dedicated show computer.
#100
BeagleBone Black Controllers / K8-Pi Cape Power
Last post by VistaLeaf - May 21, 2023, 07:50:59 AMI have a few questions about powering a K8-Pi cape separately from the Pi 3 B+.
The Pi will have its own power supply and be powered at all times. I would like to put the power supply (and thus the cape too) on a smart switch.
Question 1: will applying power to the cape when the Pi is already booted cause any problems?
Question 2: will removing power from the cape while it is attached to the Pi cause any problems?
I'll have schedules that mesh with the smart switch so power isn't added or removed while a playlist is running.
I'll be using this system year-round for permanent lights and I don't want the power supply running 24/7.
The Pi will have its own power supply and be powered at all times. I would like to put the power supply (and thus the cape too) on a smart switch.
Question 1: will applying power to the cape when the Pi is already booted cause any problems?
Question 2: will removing power from the cape while it is attached to the Pi cause any problems?
I'll have schedules that mesh with the smart switch so power isn't added or removed while a playlist is running.
I'll be using this system year-round for permanent lights and I don't want the power supply running 24/7.
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