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by jimjulian
Thu Nov 19, 2020 7:05 pm
Forum: General discussion
Topic: Pi as comm hub w/o web/bridge for 4k video?
Replies: 1
Views: 97

Pi as comm hub w/o web/bridge for 4k video?

Hello,

1. If I set up a Pi with/as a wifi access point, will I be able to use the Pi's wifi for local networking, without internet access?
Will the Pi wifi run with or without the web attached??
2. Is the Pi fast enough, as a bridge, to accomodate 4k video/DTS audio?

Thank you.
by jimjulian
Sat Jan 11, 2020 11:20 pm
Forum: Troubleshooting
Topic: Wifi access point install fails
Replies: 4
Views: 1716

Re: Wifi access point install fails

I think I may have found the problem. I select and copy the commands from the web page and paste into my SSH application. When I do multiple lines, the first letter in the paste is dropped, at least in one case:"interface=wlan0." The "i" is dropped when I paste that multi-line content which results ...
by jimjulian
Sat Jan 11, 2020 7:39 pm
Forum: Troubleshooting
Topic: Wifi access point install fails
Replies: 4
Views: 1716

Wifi access point install fails

Tried to setup a RPi4 as a Wifi AP using the following webpage: https://www.raspberrypi.org/documentation/configuration/wireless/access-point.md I have the Buster Lite O/S installed. Two steps in the process result in error messages: pi@RPi4B:~ $ sudo systemctl start hostapd Job for hostapd.service ...
by jimjulian
Thu Jan 09, 2020 11:26 pm
Forum: Troubleshooting
Topic: RPi4 headless no connect
Replies: 4
Views: 379

Re: RPi4 headless no connect

I plugged the RPi4 into my 3B+ LAN port with no luck. I then plugged the 4 into one of my router's LAN ports. I rebooted both and found the 4's IP in the router's DHCP client list. I created a DHCP reservation for the 4 for future use. The order of the sequence of boots may have an effect. All this ...
by jimjulian
Tue Jan 07, 2020 10:51 pm
Forum: General discussion
Topic: Spamhaus issue
Replies: 7
Views: 861

Spamhaus issue

I got this message after an attempted post: Your IP 24.158.83.2 has been blocked because it is blacklisted. For details please see http://www.spamhaus.org/query/bl?ip=24.158.83.2 I tried to delist but the system is not designed for consumers on a dynamic address. Is this a virus or something RPO has...
by jimjulian
Tue Jan 07, 2020 10:48 pm
Forum: Troubleshooting
Topic: RPi4 headless no connect
Replies: 4
Views: 379

RPi4 headless no connect

Hello, I have a RPi4 that I cnnot connect with. I also have a laptop that has no LAN port. I installed Buster Full with reccomended software. I add the SSH ans wpa_supplicant files. When I boot the Pi everything seems normal. The red power light comes on and stays on. The green light comes on, flash...
by jimjulian
Sun Jul 28, 2019 9:04 pm
Forum: General discussion
Topic: wireless laptop-Pi network
Replies: 1
Views: 133

wireless laptop-Pi network

How do I setup a wifi network that does not require a router or modem? I'd like to have my laptop communicate with the Pi over SSH withput the need for the Pi to be connected to a router with a LAN cable, or any router at all.
Can I use the Pi wifi independently of any other network?
by jimjulian
Wed Jun 26, 2019 3:37 pm
Forum: General discussion
Topic: 3B+ as a Wireless Access Point
Replies: 22
Views: 10458

Re: 3B+ as a Wireless Access Point

I just finished adding the Acess Point from the page on this site and mentioned above. I can use the Pi to surf the web on my laptop. I haven't done that to any great degree since I have a TP-Link Talon 7200. Regarding the band usage also mentioned above; I can use the 2.4GHz band but the option for...
by jimjulian
Wed Jun 26, 2019 3:30 pm
Forum: General discussion
Topic: A portable wifi access point
Replies: 15
Views: 1869

Re: A portable wifi access point

Very Interesting.
I can travel with my cell phone, laptop or tablet, and connect to wifi anywhere there's a public access point.
Yet, I cannot do that with a RPi?
Sounds like a suggestion for future additional features.
by jimjulian
Wed Jun 26, 2019 3:22 pm
Forum: Troubleshooting
Topic: USB 2 & 3 compatibility in wifi AP
Replies: 2
Views: 508

Re: USB 2 & 3 compatibility in wifi AP

Hello, The point is: My RPi 3B+ wifi will not use 5GHz wifi even though the option exists in one of the configuration files. No, there's no setup error, country, etc., etc.. If the Pi can use the 2.4GHz band, then the Pi should be able to use the 5GHz band. I suggest there is an error in the specifi...
by jimjulian
Sat Jun 22, 2019 4:08 pm
Forum: Troubleshooting
Topic: USB 2 & 3 compatibility in wifi AP
Replies: 2
Views: 508

USB 2 & 3 compatibility in wifi AP

I just setup the RPi with a wifi access point. I chose hardware model g for compatibility with my 2.4GHz band. Both, the Ri and the router, are 5GHZ capable. I cannot get the 5GHz mode to work. I discovered the RPi has USB ports and my router has USB 3 ports. The SSID shows in 2.4GHz mode but not in...
by jimjulian
Sun Jun 24, 2018 10:25 pm
Forum: General discussion
Topic: multiple ADS1115s and Python
Replies: 6
Views: 1142

Re: multiple ADS1115s and Python

You're contradicting your last post. This is moot. I have reason to suspect the unit is damaged. The chip, no doubt, has addressinig pins. The accessibility of these is dependent on the manufacturer's design of the breakout module. For example, the address of the PCF8591 commonly available on eBay i...
by jimjulian
Sun Jun 24, 2018 8:38 pm
Forum: General discussion
Topic: multiple ADS1115s and Python
Replies: 6
Views: 1142

Re: multiple ADS1115s and Python

I've been trying that. I get the same errors I get when the ADS1115 is connected to a different address termination than the script specifies. I have a PCF8591 at 0x48 and ADS1115 at 0x49. The PCF8591 software runs without issue, but the Adafruit ADS1x15 software crashes. The method mentioned seems ...
by jimjulian
Sun Jun 24, 2018 4:46 pm
Forum: General discussion
Topic: multiple ADS1115s and Python
Replies: 6
Views: 1142

multiple ADS1115s and Python

I have several ADS1115s I need to address from a python script. I've been using the Adafruit library which works for a single breakout board. I have not been able to determine if there is a method to select which ADS1115 I want to address. The Adafruit setup includes a "ADS1x15.py" script that sets ...
by jimjulian
Sat Jun 09, 2018 6:58 pm
Forum: General discussion
Topic: STICKY: Introduce yourself!
Replies: 3813
Views: 276182

Re: STICKY: Introduce yourself!

Hello, My name is Jim Julian (one of many). I have a degree in Psychology and minored in Electronic Engineering. I've been 'playing' with computers for over thirty years. I learned digital cartography from the ESRI Arcviiew 3.2 GIS program suite and the Matlab mathematics laboratory in the mid-2000s...
by jimjulian
Wed Jun 06, 2018 6:42 pm
Forum: General discussion
Topic: RPi3B -> RPi3B+ SD plugin replacement?
Replies: 1
Views: 387

RPi3B -> RPi3B+ SD plugin replacement?

Hello, I just received a Raspberry Pi 3B+. Prior to this, I had been using a 3B. I have an SD card I have programmed for use with a solar panel array and linear actuator. I removed the SD card from the 3B and inserted the card into the 3B+. Everything seems to work normally, so far, except the wifi ...
by jimjulian
Tue May 22, 2018 1:02 am
Forum: Troubleshooting
Topic: induction problem gpio relay load
Replies: 38
Views: 10194

Re: induction problem gpio relay load

Hello,

I noticed the relay board you use does not have an optoisolator chip. That chip keeps the relay circuit separate from the driver circuit.
Buy a board that has the 4-pin opto chip. You're probably getting feedback from the relay circuit into the driver circuit.
by jimjulian
Wed Nov 16, 2016 3:43 pm
Forum: Beginners
Topic: i2c pin availability
Replies: 9
Views: 2207

Re: i2c pin availability

I'm using the RPi 3B as a solar array monitor/controller. This requires that I uses several i2c devices. The issue is only one device can be connected to the RPi. This is a hardware problem. Has anyone found a suitable work around, other than the use of solder and wires? Is there a mechanical faste...
by jimjulian
Sat Nov 12, 2016 6:15 pm
Forum: Beginners
Topic: i2c pin availability
Replies: 9
Views: 2207

i2c pin availability

Hello, I'm using the RPi 3B as a solar array monitor/controller. This requires that I uses several i2c devices. The issue is only one device can be connected to the RPi. This is a hardware problem. Has anyone found a suitable work around, other than the use of solder and wires? Is there a mechanical...
by jimjulian
Wed Oct 19, 2016 4:28 pm
Forum: Advanced users
Topic: truly wireless remote RPi
Replies: 24
Views: 4595

Re: truly wireless remote RPi

There is no rule which states that a WiFi hotspot must be connected to the Internet. Just turn the Pi into a hotspot itself asn SSH into it from your laptop. ghans Thanks ghans. That's what I had in mind but I wanted to see if anyone had done that and if there were any preparations required. Have y...
by jimjulian
Wed Oct 19, 2016 4:25 pm
Forum: Advanced users
Topic: truly wireless remote RPi
Replies: 24
Views: 4595

Re: truly wireless remote RPi

stderr wrote:
jimjulian wrote: I'm looking for a laptop-to-RPi commuinications approach.
Perhaps I should have mentioned, a cost effective solution is required.
Isn't wifi free?
You misread, if at all. Reread and then post.
by jimjulian
Mon Oct 17, 2016 5:30 pm
Forum: Advanced users
Topic: truly wireless remote RPi
Replies: 24
Views: 4595

Re: truly wireless remote RPi

Hello, The Hotspot modems require a cellular account and cost money. I could turn my iPhone into a hotspot as far as that goes. I sometimes do when my Internet provider is down or I'm away from home. I use my phone to connect my laptop to the web. I'm looking for a laptop-to-RPi commuinications appr...
by jimjulian
Fri Oct 14, 2016 4:31 pm
Forum: Advanced users
Topic: truly wireless remote RPi
Replies: 24
Views: 4595

Re: truly wireless remote RPi

Well, why not use a set of DLAN (PowerLAN) adapters? One unit is mounted next to your solar panel array, the other one is in your house. Under UK regulations, that is not allowed. There must be NO current using equipment (only the inverter) on the solar power circuit. I can't speak for regulations ...
by jimjulian
Fri Oct 14, 2016 4:27 pm
Forum: Advanced users
Topic: truly wireless remote RPi
Replies: 24
Views: 4595

Re: truly wireless remote RPi

Hello, Thank you for all of your responses. I'm just now reading them. I want to do some clarification. My RPi has on board wifi, since I'm using a 3B. I have the Pi set upp for wifi. I'm thinking that setting up as a wifi access point may solve the problem. After that I could use the Pi as a wifi h...
by jimjulian
Mon Sep 26, 2016 7:57 pm
Forum: Advanced users
Topic: truly wireless remote RPi
Replies: 24
Views: 4595

Re: truly wireless remote RPi

Thank you. I can do all that. What I need is to communicate with the RPi with nothing but a power cable attached to the RPi.

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