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by ameador1
Wed May 08, 2019 11:57 am
Forum: Beginners
Topic: PCB manufacturers in the US (or good shipping prices and timelines for the US)?
Replies: 2
Views: 179

PCB manufacturers in the US (or good shipping prices and timelines for the US)?

I have been looking at OSHPARK - but would like to know if there are any other PCB manufacturers in the US (or that have good shipping rates and turn around times to the US - a couple weeks is fine) that you know of, recommend, recommend to avoid, etc... So far, my PCB design has met or exceeded OSH...
by ameador1
Tue May 07, 2019 7:39 pm
Forum: Beginners
Topic: I cant connect to the server
Replies: 1
Views: 110

Re: I cant connect to the server

Assuming your router is running DHCP for your network - it sounds like your router is issue IPv6 addresses. Unless you have some reason to use this - go into your router configuration and find the DHCP section for LAN address assignments and turn off IPv6. If you can't find that specifically - look ...
by ameador1
Sun May 05, 2019 3:57 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: power the Pi from 5V GPIO Pin possible?
Replies: 14
Views: 41908

Re: power the Pi from 5V GPIO Pin possible?

I don't know.[...] Well, maybe for safety sake - I'll go with the trip and hold current listed - but I'll go with the 12V max version. It sounds to me like that would cause the polyfuse to fail even before the one on the RPi. I'd rather have to remove the SMD polyfuse and replace it more often than...
by ameador1
Sun May 05, 2019 3:49 pm
Forum: Beginners
Topic: Powering RPi with PSU by Pin 2 - what about Pin 4?
Replies: 2
Views: 197

Re: Powering RPi with PSU by Pin 2 - what about Pin 4?

- should I connect this to both Pin 2 and Pin 4 to give the RPi a beefier connection to the power - or just Pin 2? Simple answer - just one is necessary. One of my longer answers: Both Pin 2 and Pin 4 connect to the same bit of copper track, about 2.54mm apart. The impedance between them is minimal...
by ameador1
Sun May 05, 2019 1:46 pm
Forum: Beginners
Topic: Multiple LEDs - series, parallel, both?
Replies: 6
Views: 587

Re: Multiple LEDs - series, parallel, both?

Just a few random observations that might answer some of your questions (I didn't carefully read everything you wrote so sorry if I am "answering" something you didn't ask. Sorry for not replying earlier... I wrote up a nice reply - and the page failed to submit and lost it! I hate when that happen...
by ameador1
Sun May 05, 2019 6:23 am
Forum: Beginners
Topic: Powering RPi with PSU by Pin 2 - what about Pin 4?
Replies: 2
Views: 197

Powering RPi with PSU by Pin 2 - what about Pin 4?

I am planning to power my RPi with a PSU via a PCB I'm designing. I am trying to locate a polyfuse so the RPi will be protected much like the one already on the RPi via its normal power plug (looking at this one at the moment: https://www.mouser.com/ProductDetail/Bourns/MF-LSMF260X-2?qs=sGAEpiMZZMsx...
by ameador1
Sat May 04, 2019 5:55 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: power the Pi from 5V GPIO Pin possible?
Replies: 14
Views: 41908

Re: power the Pi from 5V GPIO Pin possible?

Trip current and hold current appear right, but the maximum voltage is only 6v, whereas the one used on the 3B+ is 16v In normal use, that shouldn't make any difference - there shouldn't be more than 5¼v - but then, normal use isn't what the fuse is there for! And we hear tales of people putting 24...
by ameador1
Fri May 03, 2019 12:24 pm
Forum: Beginners
Topic: MCP23017 Specs mA per IO and overall mA across all IOs
Replies: 3
Views: 199

Re: MCP23017 Specs mA per IO and overall mA across all IOs

It's not the most easily understood datasheet, but here's the way I would interpret it. Yeah - the issue of 25mA or 20mA had me confussed. The Vss and Vdd were 150mA and 125mA respectively - but I assume they are accounting for some current comming in from the I2C and such so the Vss has to allow t...
by ameador1
Fri May 03, 2019 2:53 am
Forum: Beginners
Topic: MCP23017 Specs mA per IO and overall mA across all IOs
Replies: 3
Views: 199

MCP23017 Specs mA per IO and overall mA across all IOs

I am looking at the datasheet for this part - but I'm not sure what it is telling me about the per IO and overall IO mA capacities. Is this saying 20mA per IO with a max of 125mA across all IOs? https://i.imgur.com/ife1cRd.png The datasheet I'm looking at is here: http://ww1.microchip.com/downloads/...
by ameador1
Thu May 02, 2019 6:13 pm
Forum: Beginners
Topic: Multiple LEDs - series, parallel, both?
Replies: 6
Views: 587

Re: Multiple LEDs - series, parallel, both?

First of all, why are you not using a i2c isolator (for example iso1540 *). Then you can use the MCP on 5V and connect the leds direcly to the MCP without all the optocoulers. Ahh. hadn't noticed that the MCP23017 could fully run on 5V. So here's the modification: https://i.imgur.com/JckGvQs.png So...
by ameador1
Thu May 02, 2019 4:39 pm
Forum: Beginners
Topic: Multiple LEDs - series, parallel, both?
Replies: 6
Views: 587

Re: Multiple LEDs - series, parallel, both?

Oh - and the resistors in the schematic at the bottom - are just random values - I would still be interested in keeping resistance as high as possible - so long as the LEDs are bright enough. In reality the LEDs on the left (in the pair) are on an RJ45 socket and the LEDs on the right are on another...
by ameador1
Thu May 02, 2019 4:32 pm
Forum: Beginners
Topic: Multiple LEDs - series, parallel, both?
Replies: 6
Views: 587

Multiple LEDs - series, parallel, both?

Ok. so I have gotten to the point where I'm trying to do my overall design with LEDs. I am happy with the LEDs I'm using right now with 3.3KΩ resistors - they are bright enough like that and are using less than 1mA like that. My project will in total now have 22 LEDs. But I have ran into a case wher...
by ameador1
Mon Apr 29, 2019 8:03 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: power the Pi from 5V GPIO Pin possible?
Replies: 14
Views: 41908

Re: power the Pi from 5V GPIO Pin possible?

Would this be a good option for adding a "fuse" to the 5V GPIO #2 for powering the RPi via the GPIO instead of the microUSB connector? https://www.mouser.com/ProductDetail/Schurter/PFMF2602?qs=sGAEpiMZZMsxR%252BBXi4wRUPMY17Iyp8d4Vb6kUIyYcK4%3D - Based on the comment before from klricks. This is in r...
by ameador1
Sat Apr 27, 2019 9:04 pm
Forum: Beginners
Topic: [solved] Why voltage drops on bench PSU when turning on relays?
Replies: 10
Views: 343

Re: Why voltage drops on bench PSU when turning on relays?

I did it and that worked! Thanks guys!
by ameador1
Sat Apr 27, 2019 8:54 pm
Forum: Beginners
Topic: [solved] Why voltage drops on bench PSU when turning on relays?
Replies: 10
Views: 343

Re: Why voltage drops on bench PSU when turning on relays?

Yes it says put a short across the output and adjust the limit. Keeping the volts low. I would be tempted to try adjusting it when you have your relays powerred, but it's not my psu!! Nothing happens when adjusting the current knobs - I tried reading these instructions and thought that was what it ...
by ameador1
Sat Apr 27, 2019 8:11 pm
Forum: Beginners
Topic: [solved] Why voltage drops on bench PSU when turning on relays?
Replies: 10
Views: 343

Re: Why voltage drops on bench PSU when turning on relays?

I think I may have to short the + and -, then set the current dials, then remove short - it's a Chinese unit with poor instructions. I'll post a copy to see what you think...
by ameador1
Sat Apr 27, 2019 8:01 pm
Forum: Beginners
Topic: [solved] Why voltage drops on bench PSU when turning on relays?
Replies: 10
Views: 343

Re: Why voltage drops on bench PSU when turning on relays?

gordon77 wrote:
Sat Apr 27, 2019 7:50 pm
What psu model? Sounds like it's got a current limit set.
wanptek KPS3010DF from Amazon. It's supposed to be 10A.

It says something about automatically switching these modes.
by ameador1
Sat Apr 27, 2019 7:46 pm
Forum: Beginners
Topic: [solved] Why voltage drops on bench PSU when turning on relays?
Replies: 10
Views: 343

[solved] Why voltage drops on bench PSU when turning on relays?

I just bought a 30V - 10A bench PSU. I have it set for 5.00V with its light that indicated constant volts/voltage. I have this PSU powering the coil and relay LEDs, and the RPi controlling the relay signal inputs via the GPIOs. I wrote code that turns the relays on 3 seconds apart from each other so...
by ameador1
Fri Apr 26, 2019 6:05 pm
Forum: Beginners
Topic: Can't get Google Domain name to point to pi
Replies: 30
Views: 1776

Re: Can't get Google Domain name to point to pi

As a side note, for that "custom heating system" I would drop the external 3rd party service and IFTTT. Just use OpenHAB on a pi and mqtt, and reporgram the smart outlets using e.g. Tasmota. Thats what I do, so no dependency on the internet... Dropping the 3rd party stuff is what I am working on - ...
by ameador1
Fri Apr 26, 2019 2:17 am
Forum: Beginners
Topic: Can't get Google Domain name to point to pi
Replies: 30
Views: 1776

Re: Can't get Google Domain name to point to pi

Oh, and yes - I have lists of lists and notes about notes and books of steps! One of the best solutions I have found is Microsoft One Note. Works on most devices. Synchronizes across devices. Let's you have notebooks with chapters that have pages per chapter. You can embed pictures, PDFs, videos, so...
by ameador1
Fri Apr 26, 2019 2:06 am
Forum: Beginners
Topic: Can't get Google Domain name to point to pi
Replies: 30
Views: 1776

Re: Can't get Google Domain name to point to pi

Time is a never ending problem! ;) My project at hand is a custom heating system integrating heat exhausted from a small data center that I run from my house into the house to help heat the house. Using a smart thermostat and smart outlets with IFTTT and a 3rd party service that backends into IFTTT....
by ameador1
Fri Apr 26, 2019 1:03 am
Forum: Beginners
Topic: Can't get Google Domain name to point to pi
Replies: 30
Views: 1776

Re: Can't get Google Domain name to point to pi

Oh, and one last thing that I didn't think to ask as you are new at this - do you have your RPi configured with a static LAN IP address? Or, is your router configured to point port 80 traffic to your RPi by name? If your router is redirecting port 80 WAN traffic to the LAN IP of your RPi (say 192.16...
by ameador1
Fri Apr 26, 2019 12:43 am
Forum: Beginners
Topic: Can't get Google Domain name to point to pi
Replies: 30
Views: 1776

Re: Can't get Google Domain name to point to pi

Cool! That is definitely a project for after I get some HW done for my classes. I don't plan to do any credit card type stuff but would like to run a forum for the IT students at the college I attend. You'd think I should know more but actually have never touched linux in my life. I wanted to learn...
by ameador1
Fri Apr 26, 2019 12:29 am
Forum: Beginners
Topic: Can't get Google Domain name to point to pi
Replies: 30
Views: 1776

Re: Can't get Google Domain name to point to pi

Oh last quick question where would I add additional synthetic logs. I.E if I wanted to add the www.dogmeat.net or a forums.dogmeat.net? as in will it check each login and pass on each domain or...? Do you mean the Synthetic Records on Google Domains? I think that's what you are talking about. I'm n...

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